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${ item.name }
Create branch ${ searchTerm }
from 'dd81b7ad6d'
${ noResults }
Nicksxs.github.io/page/6/index.html

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<!DOCTYPE html><html lang="zh-Hans"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width"><meta name="theme-color" content="#222"><meta name="generator" content="Hexo 5.4.0"><link rel="apple-touch-icon" sizes="180x180" href="/images/apple-touch-icon-next.png"><link rel="icon" type="image/png" sizes="32x32" href="/images/favicon-32x32-next.png"><link rel="icon" type="image/png" sizes="16x16" href="/images/favicon-16x16-next.png"><link rel="mask-icon" href="/images/logo.svg" color="#222"><meta name="google-site-verification" content="2X6S9P7CAjXjVvw8YyQR8pCu-B0oEu7O9quLgxXuWyA"><meta name="baidu-site-verification" content="dV8JGNzi0c"><script>setTimeout(function(){var d=document.createElement("script");d.setAttribute("data-ad-client","ca-pub-7480618470784058"),d.async=!0,d.src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js",document.body.appendChild(d)},5e3),window.addEventListener?window.addEventListener("load",downloadJsAtOnload,!1):window.attachEvent?window.attachEvent("onload",downloadJsAtOnload):window.onload=downloadJsAtOnload</script><link rel="stylesheet" href="/css/main.css"><link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free@5.15.3/css/all.min.css" integrity="sha256-2H3fkXt6FEmrReK448mDVGKb3WW2ZZw35gI7vqHOE4Y=" crossorigin="anonymous"><link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@fancyapps/fancybox@3.5.7/dist/jquery.fancybox.min.css" integrity="sha256-Vzbj7sDDS/woiFS3uNKo8eIuni59rjyNGtXfstRzStA=" crossorigin="anonymous"><script class="next-config" data-name="main" type="application/json">{"hostname":"nicksxs.me","root":"/","images":"/images","scheme":"Pisces","version":"8.6.1","exturl":false,"sidebar":{"position":"left","display":"post","padding":18,"offset":12},"copycode":false,"bookmark":{"enable":false,"color":"#222","save":"auto"},"fancybox":true,"mediumzoom":false,"lazyload":true,"pangu":false,"comments":{"style":"tabs","active":null,"storage":true,"lazyload":false,"nav":null},"motion":{"enable":false,"async":false,"transition":{"post_block":"fadeIn","post_header":"fadeInDown","post_body":"fadeInDown","coll_header":"fadeInLeft","sidebar":"fadeInUp"}},"prism":false,"i18n":{"placeholder":"Searching...","empty":"We didn't find any results for the search: ${query}","hits_time":"${hits} results found in ${time} ms","hits":"${hits} results found"}}</script><script src="https://cdn.jsdelivr.net/npm/hexo-theme-next@8.6.1/source/js/config.min.js"></script><meta name="description" content="learn from zero,技术博客，Nicksxs，史学森"><meta property="og:type" content="website"><meta property="og:title" content="Nicksxs&#39;s Blog"><meta property="og:url" content="https://nicksxs.me/page/6/index.html"><meta property="og:site_name" content="Nicksxs&#39;s Blog"><meta property="og:description" content="learn from zero,技术博客，Nicksxs，史学森"><meta property="og:locale"><meta property="article:author" content="Nicksxs"><meta property="article:tag" content="Nicksxs,史学森,米方方,米方方的男朋友,森哥"><meta name="twitter:card" content="summary"><link rel="canonical" href="https://nicksxs.me/page/6/"><script class="next-config" data-name="page" type="application/json">{"sidebar":"","isHome":true,"isPost":false,"lang":"zh-Hans","comments":"","permalink":"","path":"page/6/index.html","title":""}</script><script class="next-config" data-name="calendar" type="application/json">""</script><title>Nicksxs's Blog</title><script async src="https://www.googletagmanager.com/gtag/js?id=UA-61358619-1"></script><script class="next-config" data-name="google_analytics" type="application/json">{"tracking_id":"UA-61358619-1","only_pageview":false}</script><script src="https://cdn.jsdelivr.net/npm/hexo-theme-next@8.6.1/source/js/third-party/analytics/google-analytics.min.js"></script><script src="https://cdn.jsdelivr.net/npm/hexo-theme-next@8.6.1/source/js/third-party/analytics/baidu-analytics.min.js"></script><script async src="https://hm.baidu.com/hm.js?20f33b3c0c0eff9b1522999c0015646d"></script><noscript><link rel="stylesheet" href="/css/noscript.css"></noscript><link rel="alternate" href="/atom.xml" title="Nicksxs's Blog" type="application/atom+xml"></head><body itemscope itemtype="http://schema.org/WebPage"><div class="headband"></div><main class="main"><header class="header" itemscope itemtype="http://schema.org/WPHeader"><div class="header-inner"><div class="site-brand-container"><div class="site-nav-toggle"><div class="toggle" aria-label="Toggle navigation bar" role="button"><span class="toggle-line"></span> <span class="toggle-line"></span> <span class="toggle-line"></span></div></div><div class="site-meta"><a href="/" class="brand" rel="start"><i class="logo-line"></i><h1 class="site-title">Nicksxs's Blog</h1><i class="logo-line"></i></a><p class="site-subtitle" itemprop="description">What hurts more, the pain of hard work or the pain of regret?</p></div><div class="site-nav-right"><div class="toggle popup-trigger"></div></div></div><nav class="site-nav"><ul class="main-menu menu"><li class="menu-item menu-item-home"><a href="/" rel="section"><i class="fa fa-home fa-fw"></i>Home</a></li><li class="menu-item menu-item-about"><a href="/about/" rel="section"><i class="fa fa-user fa-fw"></i>About</a></li><li class="menu-item menu-item-tags"><a href="/tags/" rel="section"><i class="fa fa-tags fa-fw"></i>Tags</a></li><li class="menu-item menu-item-categories"><a href="/categories/" rel="section"><i class="fa fa-th fa-fw"></i>Categories</a></li><li class="menu-item menu-item-archives"><a href="/archives/" rel="section"><i class="fa fa-archive fa-fw"></i>Archives</a></li><li class="menu-item menu-item-sitemap"><a href="/sitemap.xml" rel="section"><i class="fa fa-sitemap fa-fw"></i>Sitemap</a></li><li class="menu-item menu-item-commonweal"><a href="/404/" rel="section"><i class="fa fa-heartbeat fa-fw"></i>Commonweal 404</a></li></ul></nav></div><div class="toggle sidebar-toggle" role="button"><span class="toggle-line"></span> <span class="toggle-line"></span> <span class="toggle-line"></span></div><aside class="sidebar"><div class="sidebar-inner sidebar-overview-active"><ul class="sidebar-nav"><li class="sidebar-nav-toc">Table of Contents</li><li class="sidebar-nav-overview">Overview</li></ul><div class="sidebar-panel-container"><div class="post-toc-wrap sidebar-panel"></div><div class="site-overview-wrap sidebar-panel"><div class="site-overview"><div class="site-author site-overview-item animated" itemprop="author" itemscope itemtype="http://schema.org/Person"><img class="site-author-image" itemprop="image" alt="Nicksxs" src="/uploads/avatar.jpg"><p class="site-author-name" itemprop="name">Nicksxs</p><div class="site-description" itemprop="description">learn from zero,技术博客，Nicksxs，史学森</div></div><div class="site-state-wrap site-overview-item animated"><nav class="site-state"><div class="site-state-item site-state-posts"><a href="/archives/"><span class="site-state-item-count">119</span> <span class="site-state-item-name">posts</span></a></div><div class="site-state-item site-state-categories"><a href="/categories/"><span class="site-state-item-count">136</span> <span class="site-state-item-name">categories</span></a></div><div class="site-state-item site-state-tags"><a href="/tags/"><span class="site-state-item-count">246</span> <span class="site-state-item-name">tags</span></a></div></nav></div><div class="links-of-author site-overview-item animated"><span class="links-of-author-item"><a href="https://github.com/nicksxs" title="GitHub → https:&#x2F;&#x2F;github.com&#x2F;nicksxs" rel="noopener" target="_blank"><i class="fab fa-github fa-fw"></i>GitHub</a> </span><span class="links-of-author-item"><a href="mailto:nicksxs1202@gmail.com" title="E-Mail → mailto:nicksxs1202@gmail.com" rel="noopener" target="_blank"><i class="fa fa-envelope fa-fw"></i>E-Mail</a></span></div><div class="cc-license site-overview-item animated" itemprop="license"><a href="https://creativecommons.org/licenses/by-nc-sa/4.0/" class="cc-opacity" rel="noopener" target="_blank"><img src="https://cdn.jsdelivr.net/npm/@creativecommons/vocabulary@2020.11.3/assets/license_badges/small/by_nc_sa.svg" alt="Creative Commons"></a></div><script charset="utf-8" src="/js/tagcloud.js"></script><script charset="utf-8" src="/js/tagcanvas.js"></script><div class="widget-wrap"><div id="myCanvasContainer" class="widget tagcloud"><canvas width="250" height="250" id="resCanvas"><ul class="tag-list" itemprop="keywords"><li class="tag-list-item"><a class="tag-list-link" href="/tags/2019/" rel="tag">2019</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/2020/" rel="tag">2020</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/2021/" rel="tag">2021</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/2PC/" rel="tag">2PC</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/360-%E5%85%A8%E5%AE%B6%E6%A1%B6/" rel="tag">360 全家桶</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/3PC/" rel="tag">3PC</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/AOP/" rel="tag">AOP</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Adaptive/" rel="tag">Adaptive</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Apollo/" rel="tag">Apollo</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/AutoConfiguration/" rel="tag">AutoConfiguration</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Binary-Tree/" rel="tag">Binary Tree</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Broker/" rel="tag">Broker</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/C/" rel="tag">C</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/C/" rel="tag">C++</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/CachedThreadPool/" rel="tag">CachedThreadPool</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Comparator/" rel="tag">Comparator</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/DFS/" rel="tag">DFS</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/DP/" rel="tag">DP</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/DefaultMQPushConsumer/" rel="tag">DefaultMQPushConsumer</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Design-Patterns/" rel="tag">Design Patterns</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Distributed-Lock/" rel="tag">Distributed Lock</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Docker/" rel="tag">Docker</a><span class="tag-list-count">4</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Dockerfile/" rel="tag">Dockerfile</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Dubbo/" rel="tag">Dubbo</a><span class="tag-list-count">4</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/EagerThreadPool/" rel="tag">EagerThreadPool</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Evict/" rel="tag">Evict</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Filter/" rel="tag">Filter</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/FixedThreadPool/" rel="tag">FixedThreadPool</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/G1/" rel="tag">G1</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/GC/" rel="tag">GC</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Garbage-First-Collector/" rel="tag">Garbage-First Collector</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Gogs/" rel="tag">Gogs</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Homebrew/" rel="tag">Homebrew</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Inorder-Traversal/" rel="tag">Inorder Traversal</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Interceptor/" rel="tag">Interceptor</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/JMap/" rel="tag">JMap</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/JPS/" rel="tag">JPS</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/JStack/" rel="tag">JStack</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/JVM/" rel="tag">JVM</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Java/" rel="tag">Java</a><span class="tag-list-count">19</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Leetcode-42/" rel="tag">Leetcode 42</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/LimitedThreadPool/" rel="tag">LimitedThreadPool</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Linked-List/" rel="tag">Linked List</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Lowest-Common-Ancestor-of-a-Binary-Tree/" rel="tag">Lowest Common Ancestor of a Binary Tree</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/MQ/" rel="tag">MQ</a><span class="tag-list-count">6</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Mac/" rel="tag">Mac</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Maven/" rel="tag">Maven</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Mybatis/" rel="tag">Mybatis</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Mysql/" rel="tag">Mysql</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/NameServer/" rel="tag">NameServer</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/PHP/" rel="tag">PHP</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Preorder-Traversal/" rel="tag">Preorder Traversal</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/RPC/" rel="tag">RPC</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Redis/" rel="tag">Redis</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/RocketMQ/" rel="tag">RocketMQ</a><span class="tag-list-count">6</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Rotate-Image/" rel="tag">Rotate Image</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Rust/" rel="tag">Rust</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/SPI/" rel="tag">SPI</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Servlet/" rel="tag">Servlet</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Singleton/" rel="tag">Singleton</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Spring/" rel="tag">Spring</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/SpringBoot/" rel="tag">SpringBoot</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Sql%E6%B3%A8%E5%85%A5/" rel="tag">Sql注入</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Stream/" rel="tag">Stream</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Synchronized/" rel="tag">Synchronized</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Thread-dump/" rel="tag">Thread dump</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/ThreadLocal/" rel="tag">ThreadLocal</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/ThreadPool/" rel="tag">ThreadPool</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Tomcat/" rel="tag">Tomcat</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Trapping-Rain-Water/" rel="tag">Trapping Rain Water</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/WeakReference/" rel="tag">WeakReference</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Web/" rel="tag">Web</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Webhook/" rel="tag">Webhook</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/aqs/" rel="tag">aqs</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/await/" rel="tag">await</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/bloom-filter/" rel="tag">bloom filter</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/c/" rel="tag">c++</a><span class="tag-list-count">14</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/cgroup/" rel="tag">cgroup</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/cluster/" rel="tag">cluster</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/condition/" rel="tag">condition</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/docker/" rel="tag">docker</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/dp/" rel="tag">dp</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/echo/" rel="tag">echo</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/environment/" rel="tag">environment</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/gap-lock/" rel="tag">gap lock</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/gc/" rel="tag">gc</a><span 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rel="tag">mfc</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/min-stack/" rel="tag">min stack</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/mq/" rel="tag">mq</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/mvcc/" rel="tag">mvcc</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/mysql/" rel="tag">mysql</a><span class="tag-list-count">5</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/namespace/" rel="tag">namespace</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/next-key-lock/" rel="tag">next-key lock</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/nginx/" rel="tag">nginx</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/nullsfirst/" rel="tag">nullsfirst</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/openresty/" rel="tag">openresty</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/php/" rel="tag">php</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/procedure/" rel="tag">procedure</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/python/" rel="tag">python</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/read-view/" rel="tag">read view</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/redis/" rel="tag">redis</a><span class="tag-list-count">11</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/signal/" rel="tag">signal</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/sort/" rel="tag">sort</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/spark/" rel="tag">spark</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/stack/" rel="tag">stack</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/string/" rel="tag">string</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/swoole/" rel="tag">swoole</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/top/" rel="tag">top</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/uname/" rel="tag">uname</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/unlock/" rel="tag">unlock</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/value/" rel="tag">value</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/websocket/" rel="tag">websocket</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/zsh/" rel="tag">zsh</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%89%E9%98%B6%E6%AE%B5%E6%8F%90%E4%BA%A4/" rel="tag">三阶段提交</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%8D%E5%8F%AF%E5%8F%98%E5%BC%95%E7%94%A8/" rel="tag">不可变引用</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%9C%E4%BA%AC%E5%A5%A5%E8%BF%90%E4%BC%9A/" rel="tag">东京奥运会</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%A4%E9%98%B6%E6%AE%B5%E6%8F%90%E4%BA%A4/" rel="tag">两阶段提交</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%AD%E5%B1%B1%E8%B7%AF/" rel="tag">中山路</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%AD%E5%BA%8F/" rel="tag">中序</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%AD%E9%97%B4%E4%BB%B6/" rel="tag">中间件</a><span class="tag-list-count">4</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%BE%E9%87%8D/" rel="tag">举重</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B9%92%E4%B9%93%E7%90%83/" rel="tag">乒乓球</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%BA%8C%E5%8F%89%E6%A0%91/" rel="tag">二叉树</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%BA%92%E6%96%A5%E9%94%81/" rel="tag">互斥锁</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%BB%A3%E7%A0%81%E9%A2%98%E8%A7%A3/" rel="tag">代码题解</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%BF%AE%E7%94%B5%E8%84%91%E7%9A%84/" rel="tag">修电脑的</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%81%8F%E5%90%91%E9%94%81/" rel="tag">偏向锁</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%81%A5%E5%BA%B7%E7%A0%81/" rel="tag">健康码</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%85%AC%E4%BA%A4/" rel="tag">公交</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%85%AC%E4%BA%A4%E8%BD%A6/" rel="tag">公交车</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%86%85%E5%AD%98%E5%88%86%E5%B8%83/" rel="tag">内存分布</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%86%85%E5%AD%98%E6%B3%84%E6%BC%8F/" rel="tag">内存泄漏</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%87%86%E5%A4%87/" rel="tag">准备</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%87%8F%E8%82%A5/" rel="tag">减肥</a><span class="tag-list-count">6</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%88%86%E5%B8%83%E5%BC%8F%E4%BA%8B%E5%8A%A1/" rel="tag">分布式事务</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%88%86%E5%B8%83%E5%BC%8F%E9%94%81/" rel="tag">分布式锁</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%88%87%E7%89%87/" rel="tag">切片</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%88%9D%E5%A7%8B%E5%8C%96/" rel="tag">初始化</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%89%8A%E5%B3%B0%E5%A1%AB%E8%B0%B7/" rel="tag">削峰填谷</a><span class="tag-list-count">4</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%89%8D%E5%BA%8F/" rel="tag">前序</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8A%A0%E5%A1%9E/" rel="tag">加塞</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8A%A0%E8%BD%BD/" rel="tag">加载</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8D%95%E4%BE%8B/" rel="tag">单例</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8D%9A%E5%AE%A2%EF%BC%8C%E6%96%87%E7%AB%A0/" rel="tag">博客，文章</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8E%A6%E9%97%A8/" rel="tag">厦门</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8F%8C%E4%BA%B2%E5%A7%94%E6%B4%BE/" rel="tag">双亲委派</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8F%91%E8%A1%8C%E7%89%88/" rel="tag">发行版</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8F%A3%E7%BD%A9/" rel="tag">口罩</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8F%AF%E5%8F%98%E5%BC%95%E7%94%A8/" rel="tag">可变引用</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%90%90%E6%A7%BD/" rel="tag">吐槽</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6/" rel="tag">垃圾回收</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%9F%BA%E7%A1%80%E8%AE%BE%E6%96%BD/" rel="tag">基础设施</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%AE%89%E5%85%A8/" rel="tag">安全</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%AE%B9%E9%94%99%E6%9C%BA%E5%88%B6/" rel="tag">容错机制</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%AF%84%E7%94%9F%E8%99%AB/" rel="tag">寄生虫</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B0%84%E5%87%BB/" rel="tag">射击</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B0%8F%E6%8A%80%E5%B7%A7/" rel="tag">小技巧</a><span class="tag-list-count">4</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B1%80%E5%8F%A3%E8%A1%97/" rel="tag">局口街</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B8%83%E9%9A%86%E8%BF%87%E6%BB%A4%E5%99%A8/" rel="tag">布隆过滤器</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B9%B2%E6%B4%BB/" rel="tag">干活</a><span class="tag-list-count">5</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B9%B4%E4%B8%AD%E6%80%BB%E7%BB%93/" rel="tag">年中总结</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B9%B4%E7%BB%88%E6%80%BB%E7%BB%93/" rel="tag">年终总结</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B9%B6%E5%8F%91/" rel="tag">并发</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B9%B8%E7%A6%8F%E4%BA%86%E5%90%97/" rel="tag">幸福了吗</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B9%BB%E8%AF%BB/" rel="tag">幻读</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%BA%94%E7%94%A8/" rel="tag">应用</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%BC%80%E8%BD%A6/" rel="tag">开车</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%BC%B1%E5%BC%95%E7%94%A8/" rel="tag">弱引用</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%BD%B1%E8%AF%84/" rel="tag">影评</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%89%80%E6%9C%89%E6%9D%83/" rel="tag">所有权</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%89%93%E5%8D%A1/" rel="tag">打卡</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%89%B6%E6%A2%AF/" rel="tag">扶梯</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%8A%80%E6%9C%AF/" rel="tag">技术</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%8B%96%E6%9B%B4/" rel="tag">拖更</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%8E%92%E5%BA%8F/" rel="tag">排序</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%8E%A5%E9%9B%A8%E6%B0%B4/" rel="tag">接雨水</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84/" rel="tag">数据结构</a><span class="tag-list-count">11</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%96%B0%E8%AF%AD%E8%A8%80/" rel="tag">新语言</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%97%85%E6%B8%B8/" rel="tag">旅游</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%9B%BE%E5%8E%9D%E5%9E%B5/" rel="tag">曾厝垵</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%9C%80%E5%B0%8F%E6%A0%88/" 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itemtype="http://schema.org/Person"><meta itemprop="image" content="/uploads/avatar.jpg"><meta itemprop="name" content="Nicksxs"><meta itemprop="description" content="learn from zero,技术博客，Nicksxs，史学森"></span><span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization"><meta itemprop="name" content="Nicksxs's Blog"></span><header class="post-header"><h2 class="post-title" itemprop="name headline"><a href="/2021/03/21/%E5%85%B3%E4%BA%8E%E5%85%AC%E5%85%B1%E4%BA%A4%E9%80%9A%E5%86%8D%E5%90%90%E4%B8%AA%E6%A7%BD/" class="post-title-link" itemprop="url">关于公共交通再吐个槽</a></h2><div class="post-meta-container"><div class="post-meta"><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-calendar"></i> </span><span class="post-meta-item-text">Posted on</span> <time title="Created: 2021-03-21 23:23:40" itemprop="dateCreated datePublished" datetime="2021-03-21T23:23:40+08:00">2021-03-21</time> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-folder"></i> </span><span class="post-meta-item-text">In</span> <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/%E7%94%9F%E6%B4%BB/" itemprop="url" rel="index"><span itemprop="name">生活</span></a> </span>, <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/%E7%94%9F%E6%B4%BB/%E5%85%AC%E4%BA%A4/" itemprop="url" rel="index"><span itemprop="name">公交</span></a> </span></span><span id="/2021/03/21/%E5%85%B3%E4%BA%8E%E5%85%AC%E5%85%B1%E4%BA%A4%E9%80%9A%E5%86%8D%E5%90%90%E4%B8%AA%E6%A7%BD/" class="post-meta-item leancloud_visitors" data-flag-title="关于公共交通再吐个槽" title="Views"><span class="post-meta-item-icon"><i class="far fa-eye"></i> </span><span class="post-meta-item-text">Views: </span><span class="leancloud-visitors-count"></span> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-comment"></i> </span><span class="post-meta-item-text">Disqus: </span><a title="disqus" href="/2021/03/21/%E5%85%B3%E4%BA%8E%E5%85%AC%E5%85%B1%E4%BA%A4%E9%80%9A%E5%86%8D%E5%90%90%E4%B8%AA%E6%A7%BD/#disqus_thread" itemprop="discussionUrl"><span class="post-comments-count disqus-comment-count" data-disqus-identifier="2021/03/21/关于公共交通再吐个槽/" itemprop="commentCount"></span></a></span></div></div></header><div class="post-body" itemprop="articleBody"><p>事情源于周末来回家发生的两件事情，先是回去的时候从高铁下车要坐公交，现在算是有个比较好的临时候车点了，但是可能由于疫情好转，晚上都不用检查健康码就可以进候车点，但是上公交的时候还是需要看健康码，一般情况下从高铁下来的，各个地方的人都有，而且也不太清楚这边上公交车需要查验健康码，我的一个看法是候车的时候就应该放个横幅告示，或者再配合喇叭循环播放，请提前准备好健康码，上车前需要查验，因为像这周的情况，我乘坐的那辆车是间隔时间比较长，而且终点是工业开发区，可能是比较多外来务工人员的目的地，正好这部分人可能对于操作手机检验健康码这个事情不太熟悉，所以结果就是头上几个不知道怎么搞出来健康码，然后让几乎有满满一整车的人在后面堵着，司机又非常厌烦那些没有提前出示健康码的，有位乘客搞得久了点，还被误以为没刷卡买票，差点吵起来，其实公共交通或者高铁站负责的在公交指引路线上多写一句上车前需要查验健康码，可能就能改善比较多，还有就是那个积水的路，这个吐槽起来就一大坨了，整个绍兴像 dayuejin 一样到处都是破路。<br>第二个就是来杭州的时候，经过人行横道，远处车道的公交车停下来等我们了，为了少添麻烦总想快点穿过去，但是这时靠近我们的车道（晚上光线较暗，可见度不佳）有一辆从远处来的奥迪 A4 还是 A5 这种的车反而想加速冲过去，如果少看一下可能我已经残了，交规考的靠近人行道要减速好像基本都是个摆设了，杭州也只有公交车因为一些考核指标原因会主动礼让，人其实需要有同理心，虽然可能有些人是开车多于骑车走路的，但是总也不可能永远不穿人行道吧，甚至这些人可能还会在人行道红灯的时候走过去。这个事情不是吐槽公共交通的，只是也有些许关系，想起来还有一件事也是刚才来杭州的时候看到的，等公交的时候看到有辆路虎要加塞，而目标车道刚好是辆大货车，大货车看到按了喇叭，路虎犹豫了下还是挤进去了，可能是对路虎的扛撞性能非常自信吧，反正我是挺后怕的，这种级别的车，被撞了的话估计还是鸡蛋撞石头，吨位惯性在那，这里再延伸下，挺多开豪车的人好像都觉得这路上路权更大一些，谁谁都得让着他，可能实际吃亏的不多，所以越加巩固了这种思维，当真的碰到不管的可能就会明白了，路权这个事情在天朝也基本没啥人重视，也没想说个结论，就到这吧</p></div><footer class="post-footer"><div class="post-eof"></div></footer></article></div><div class="post-block"><article itemscope itemtype="http://schema.org/Article" class="post-content"><link itemprop="mainEntityOfPage" href="https://nicksxs.me/2021/03/14/Leetcode-121-%E4%B9%B0%E5%8D%96%E8%82%A1%E7%A5%A8%E7%9A%84%E6%9C%80%E4%BD%B3%E6%97%B6%E6%9C%BA-Best-Time-to-Buy-and-Sell-Stock-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/"><span hidden itemprop="author" itemscope itemtype="http://schema.org/Person"><meta itemprop="image" content="/uploads/avatar.jpg"><meta itemprop="name" content="Nicksxs"><meta itemprop="description" content="learn from zero,技术博客，Nicksxs，史学森"></span><span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization"><meta itemprop="name" content="Nicksxs's Blog"></span><header class="post-header"><h2 class="post-title" itemprop="name headline"><a href="/2021/03/14/Leetcode-121-%E4%B9%B0%E5%8D%96%E8%82%A1%E7%A5%A8%E7%9A%84%E6%9C%80%E4%BD%B3%E6%97%B6%E6%9C%BA-Best-Time-to-Buy-and-Sell-Stock-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/" class="post-title-link" itemprop="url">Leetcode 121 买卖股票的最佳时机(Best Time to Buy and Sell Stock) 题解分析</a></h2><div class="post-meta-container"><div class="post-meta"><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-calendar"></i> </span><span class="post-meta-item-text">Posted on</span> <time title="Created: 2021-03-14 22:34:30" itemprop="dateCreated datePublished" datetime="2021-03-14T22:34:30+08:00">2021-03-14</time> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-folder"></i> </span><span class="post-meta-item-text">In</span> <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/Java/" itemprop="url" rel="index"><span itemprop="name">Java</span></a> </span>, <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/leetcode/" itemprop="url" rel="index"><span itemprop="name">leetcode</span></a> </span>, <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/DP/" itemprop="url" rel="index"><span itemprop="name">DP</span></a> </span>, <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/leetcode/java/" itemprop="url" rel="index"><span itemprop="name">java</span></a> </span>, <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/leetcode/java/DP/" itemprop="url" rel="index"><span itemprop="name">DP</span></a> </span></span><span id="/2021/03/14/Leetcode-121-%E4%B9%B0%E5%8D%96%E8%82%A1%E7%A5%A8%E7%9A%84%E6%9C%80%E4%BD%B3%E6%97%B6%E6%9C%BA-Best-Time-to-Buy-and-Sell-Stock-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/" class="post-meta-item leancloud_visitors" data-flag-title="Leetcode 121 买卖股票的最佳时机(Best Time to Buy and Sell Stock) 题解分析" title="Views"><span class="post-meta-item-icon"><i class="far fa-eye"></i> </span><span class="post-meta-item-text">Views: </span><span class="leancloud-visitors-count"></span> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-comment"></i> </span><span class="post-meta-item-text">Disqus: </span><a title="disqus" href="/2021/03/14/Leetcode-121-%E4%B9%B0%E5%8D%96%E8%82%A1%E7%A5%A8%E7%9A%84%E6%9C%80%E4%BD%B3%E6%97%B6%E6%9C%BA-Best-Time-to-Buy-and-Sell-Stock-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/#disqus_thread" itemprop="discussionUrl"><span class="post-comments-count disqus-comment-count" data-disqus-identifier="2021/03/14/Leetcode-121-买卖股票的最佳时机-Best-Time-to-Buy-and-Sell-Stock-题解分析/" itemprop="commentCount"></span></a></span></div></div></header><div class="post-body" itemprop="articleBody"><h3 id="题目介绍"><a href="#题目介绍" class="headerlink" title="题目介绍"></a>题目介绍</h3><p>You are given an array <code>prices</code> where <code>prices[i]</code> is the price of a given stock on the i<sup>th</sup> day.</p><p>You want to maximize your profit by choosing a <strong>single day</strong> to buy one stock and choosing a <strong>different day in the future</strong> to sell that stock.</p><p>Return the maximum profit you can achieve from this transaction. If you cannot achieve any profit, return <code>0</code>.</p><p>给定一个数组 <code>prices</code> ，它的第 <code>i</code> 个元素 <code>prices[i]</code> 表示一支给定股票第 <code>i</code> 天的价格。</p><p>你只能选择 <strong>某一天</strong> 买入这只股票，并选择在 <strong>未来的某一个不同的日子</strong> 卖出该股票。设计一个算法来计算你所能获取的最大利润。</p><p>返回你可以从这笔交易中获取的最大利润。如果你不能获取任何利润，返回 <code>0</code> 。</p><h3 id="简单分析"><a href="#简单分析" class="headerlink" title="简单分析"></a>简单分析</h3><p>其实这个跟二叉树的最长路径和有点类似，需要找到整体的最大收益，但是在迭代过程中需要一个当前的值</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">int</span> maxSofar <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token keyword">public</span> <span class="token keyword">int</span> <span class="token function">maxProfit</span><span class="token punctuation">(</span><span class="token keyword">int</span><span class="token punctuation">[</span><span class="token punctuation">]</span> prices<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>prices<span class="token punctuation">.</span>length <span class="token operator">&lt;=</span> <span class="token number">1</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">int</span> maxIn <span class="token operator">=</span> prices<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">int</span> maxOut <span class="token operator">=</span> prices<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">;</span> i <span class="token operator">&lt;</span> prices<span class="token punctuation">.</span>length<span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>maxIn <span class="token operator">></span> prices<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// 当循环当前值小于之前的买入值时就当成买入值，同时卖出也要更新</span>
maxIn <span class="token operator">=</span> prices<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">;</span>
maxOut <span class="token operator">=</span> prices<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>prices<span class="token punctuation">[</span>i<span class="token punctuation">]</span> <span class="token operator">></span> maxOut<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// 表示一个可卖出点，即比买入值高时</span>
maxOut <span class="token operator">=</span> prices<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token comment">// 需要设置一个历史值</span>
maxSofar <span class="token operator">=</span> <span class="token class-name">Math</span><span class="token punctuation">.</span><span class="token function">max</span><span class="token punctuation">(</span>maxSofar<span class="token punctuation">,</span> maxOut <span class="token operator">-</span> maxIn<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">return</span> maxSofar<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><h3 id="总结下"><a href="#总结下" class="headerlink" title="总结下"></a>总结下</h3><p>一开始看到 easy 就觉得是很简单，就没有 maxSofar ，但是一提交就出现问题了<br>对于<code>[2, 4, 1]</code>这种就会变成 0，所以还是需要一个历史值来存放历史最大值，这题有点动态规划的意思</p></div><footer class="post-footer"><div class="post-eof"></div></footer></article></div><div class="post-block"><article itemscope itemtype="http://schema.org/Article" class="post-content"><link itemprop="mainEntityOfPage" href="https://nicksxs.me/2021/03/07/%E3%80%8A%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E7%AE%97%E6%B3%95%E6%89%8B%E5%86%8C%E8%AF%BB%E4%B9%A6%E3%80%8B%E7%AC%94%E8%AE%B0%E4%B9%8B%E6%95%B4%E7%90%86%E7%AE%97%E6%B3%95/"><span hidden itemprop="author" itemscope itemtype="http://schema.org/Person"><meta itemprop="image" content="/uploads/avatar.jpg"><meta itemprop="name" content="Nicksxs"><meta itemprop="description" content="learn from zero,技术博客，Nicksxs，史学森"></span><span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization"><meta itemprop="name" content="Nicksxs's Blog"></span><header class="post-header"><h2 class="post-title" itemprop="name headline"><a href="/2021/03/07/%E3%80%8A%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E7%AE%97%E6%B3%95%E6%89%8B%E5%86%8C%E8%AF%BB%E4%B9%A6%E3%80%8B%E7%AC%94%E8%AE%B0%E4%B9%8B%E6%95%B4%E7%90%86%E7%AE%97%E6%B3%95/" class="post-title-link" itemprop="url">《垃圾回收算法手册读书》笔记之整理算法</a></h2><div class="post-meta-container"><div class="post-meta"><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-calendar"></i> </span><span class="post-meta-item-text">Posted on</span> <time title="Created: 2021-03-07 20:37:06" itemprop="dateCreated datePublished" datetime="2021-03-07T20:37:06+08:00">2021-03-07</time> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-folder"></i> </span><span class="post-meta-item-text">In</span> <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/Java/" itemprop="url" rel="index"><span itemprop="name">Java</span></a> </span>, <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/Java/gc/" itemprop="url" rel="index"><span itemprop="name">gc</span></a> </span>, <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/Java/gc/jvm/" itemprop="url" rel="index"><span itemprop="name">jvm</span></a> </span></span><span id="/2021/03/07/%E3%80%8A%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E7%AE%97%E6%B3%95%E6%89%8B%E5%86%8C%E8%AF%BB%E4%B9%A6%E3%80%8B%E7%AC%94%E8%AE%B0%E4%B9%8B%E6%95%B4%E7%90%86%E7%AE%97%E6%B3%95/" class="post-meta-item leancloud_visitors" data-flag-title="《垃圾回收算法手册读书》笔记之整理算法" title="Views"><span class="post-meta-item-icon"><i class="far fa-eye"></i> </span><span class="post-meta-item-text">Views: </span><span class="leancloud-visitors-count"></span> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-comment"></i> </span><span class="post-meta-item-text">Disqus: </span><a title="disqus" href="/2021/03/07/%E3%80%8A%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E7%AE%97%E6%B3%95%E6%89%8B%E5%86%8C%E8%AF%BB%E4%B9%A6%E3%80%8B%E7%AC%94%E8%AE%B0%E4%B9%8B%E6%95%B4%E7%90%86%E7%AE%97%E6%B3%95/#disqus_thread" itemprop="discussionUrl"><span class="post-comments-count disqus-comment-count" data-disqus-identifier="2021/03/07/《垃圾回收算法手册读书》笔记之整理算法/" itemprop="commentCount"></span></a></span></div></div></header><div class="post-body" itemprop="articleBody"><p>最近看了下这本垃圾回收算法手册，看到了第三章的标记-整理回收算法，做个简单的读书笔记</p><h3 id="双指针整理算法"><a href="#双指针整理算法" class="headerlink" title="双指针整理算法"></a>双指针整理算法</h3><p>对于一块待整理区域，通过两个指针，free 在区域的起始端，scan 指针在区域的末端，free 指针从前往后知道找到空闲区域，scan 从后往前一直找到存活对象，当 free 指针未与 scan 指针交叉时，会给 scan 位置的对象特定位置标记上 free 的地址，即将要转移的地址，不过这里有个限制，这种整理算法一般会用于对象大小统一的情况，否则 free 指针扫描时还需要匹配scan 指针扫描到的存活对象的大小。<br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/yLQlgj.png"></p><h3 id="Lisp-2-整理算法"><a href="#Lisp-2-整理算法" class="headerlink" title="Lisp 2 整理算法"></a>Lisp 2 整理算法</h3><p>需要三次完整遍历堆区域<br>第一遍是遍历后将计算出所有对象的最终地址（转发地址）<br>第二遍是使用转发地址更新赋值器线程根以及被标记对象中的引用，该操作将确保它们指向对象的新位置<br>第三次遍历是relocate最终将存活对象移动到其新的目标位置</p><h3 id="引线整理算法"><a href="#引线整理算法" class="headerlink" title="引线整理算法"></a>引线整理算法</h3><p>这个真的长见识了，<br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/6yeA7n.png"><br>可以看到，原来是 A，B，C 对象引用了 N，这里会在第一次遍历的时候把这种引用反过来，让 N 的对象头部保存下 A 的地址，表示这类引用，然后在遍历到 B 的时候在链起来，到最后就会把所有引用了 N 对象的所有对象通过引线链起来，在第二次遍历的时候就把更新A，B，C 对象引用的 N 地址，并且移动 N 对象</p><h3 id="单次遍历算法"><a href="#单次遍历算法" class="headerlink" title="单次遍历算法"></a>单次遍历算法</h3><p>这个一直提到过位图的实现方式，<br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/Jqtuzu.png"><br>可以看到在第一步会先通过位图标记，标记的方式是位图的每一位对应的堆内存的一个字（这里可能指的是 byte 吧），然后将一个存活对象的内存区域的第一个字跟最后一个字标记，这里如果在通过普通的方式就还需要一个地方在存转发地址，但是因为具体的位置可以通过位图算出来，也就不需要额外记录了</p></div><footer class="post-footer"><div class="post-eof"></div></footer></article></div><div class="post-block"><article itemscope itemtype="http://schema.org/Article" class="post-content"><link itemprop="mainEntityOfPage" href="https://nicksxs.me/2021/02/28/%E9%97%B2%E8%81%8A%E4%B8%8B%E4%B9%98%E5%85%AC%E4%BA%A4%E7%9A%84%E7%94%A8%E6%88%B7%E4%BD%93%E9%AA%8C/"><span hidden itemprop="author" itemscope itemtype="http://schema.org/Person"><meta itemprop="image" content="/uploads/avatar.jpg"><meta itemprop="name" content="Nicksxs"><meta itemprop="description" content="learn from zero,技术博客，Nicksxs，史学森"></span><span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization"><meta itemprop="name" content="Nicksxs's Blog"></span><header class="post-header"><h2 class="post-title" itemprop="name headline"><a href="/2021/02/28/%E9%97%B2%E8%81%8A%E4%B8%8B%E4%B9%98%E5%85%AC%E4%BA%A4%E7%9A%84%E7%94%A8%E6%88%B7%E4%BD%93%E9%AA%8C/" class="post-title-link" itemprop="url">闲聊下乘公交的用户体验</a></h2><div class="post-meta-container"><div class="post-meta"><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-calendar"></i> </span><span class="post-meta-item-text">Posted on</span> <time title="Created: 2021-02-28 21:56:42" itemprop="dateCreated datePublished" datetime="2021-02-28T21:56:42+08:00">2021-02-28</time> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-folder"></i> </span><span class="post-meta-item-text">In</span> <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/%E7%94%9F%E6%B4%BB/" itemprop="url" rel="index"><span itemprop="name">生活</span></a> </span>, <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/%E7%94%9F%E6%B4%BB/%E5%85%AC%E4%BA%A4/" itemprop="url" rel="index"><span itemprop="name">公交</span></a> </span></span><span id="/2021/02/28/%E9%97%B2%E8%81%8A%E4%B8%8B%E4%B9%98%E5%85%AC%E4%BA%A4%E7%9A%84%E7%94%A8%E6%88%B7%E4%BD%93%E9%AA%8C/" class="post-meta-item leancloud_visitors" data-flag-title="闲聊下乘公交的用户体验" title="Views"><span class="post-meta-item-icon"><i class="far fa-eye"></i> </span><span class="post-meta-item-text">Views: </span><span class="leancloud-visitors-count"></span> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-comment"></i> </span><span class="post-meta-item-text">Disqus: </span><a title="disqus" href="/2021/02/28/%E9%97%B2%E8%81%8A%E4%B8%8B%E4%B9%98%E5%85%AC%E4%BA%A4%E7%9A%84%E7%94%A8%E6%88%B7%E4%BD%93%E9%AA%8C/#disqus_thread" itemprop="discussionUrl"><span class="post-comments-count disqus-comment-count" data-disqus-identifier="2021/02/28/闲聊下乘公交的用户体验/" itemprop="commentCount"></span></a></span></div></div></header><div class="post-body" itemprop="articleBody"><p>新年开工开车来杭州，因为没有车位加限行今天来就没开车来了，从东站做公交回住的地方，这班神奇的车我之前也吐槽过了，有神奇的乘客和神奇的司机，因为基本上这班车是从我毕业就开始乘了，所以也算是比较熟悉了，以前总体感觉不太好的是乘坐时间太长了，不过这个也不能怪车，是我自己住得远（离东站），后来住到了现在的地方，也算是直达，并且 LD 比较喜欢直达的，不爱更快却要换乘的地铁，所以坐的频率比较高，也说过前面那些比较气人的乘客，自己不好好戴口罩，反而联合一起上车的乘客诽谤司机，说他要吃人了要打人了，也正是这个司机比较有意思，上车就让戴好口罩，还给大家讲，哪里哪里又有疫情了，我觉得其实这个司机还是不错的，特殊时期，对于这种公共交通，这样的确是比较负责任的做法，只是说话方式，语气这个因人而异，他也不是来伺候人的，而且这么一大车人，说了一遍不行，再说一遍，三遍以上了，嗓门大一点也属于正常的人的行为。<br>还是说回今天要说的，今天这位司机我看着跟前面说的那位有点像，因为上车的时候比较暗没看清脸，主要原因是这位司机开车比较猛，比较急，然后车上因为这个时间点，比较多大学开学来的学生，拎着个行李箱，一开始是前面已经都站满了人，后面还有很多空位，因为后面没地方放行李箱，就因为这样前面站着的有几个就在说司机开慢点，结果司机貌似也没听进去，还是我行我素，过了会又有人说司机开稳一点，就在这个人说完没一会，停在红绿灯路口的车里，就有人问有没有垃圾桶，接着又让司机开门，说晕车太严重了，要下车，司机开了门，我望出去两个妹子下了车，好像在路边草丛吐了，前面开门下车的时候就有人说她们第一次来杭州，可能有点责怪司机开的不稳，也影响了杭州交通给新来杭州的人的感受，说完了事情经过，其实我有蛮多感触，对于杭州公交司机，我大概是大一来了没多久，陪室友去文三路买电脑就晕车，下车的时候在公交车站吐了，可能是从大学开始缺乏锻炼，又饮食不规律，更加容易晕车，大部分晕车我觉得都是我自己的原因，有时候是上车前吃太多了，或者早上起太早，没睡好，没吃东西，反正自己也是挺多原因的，说到司机的原因的话，我觉得可能这班车还算好的，最让我难受的还是上下班高峰的时候，因为经过的那条路是比较重要的主干道，路比较老比较窄，并且还有很多人行道，所以经常一脚油门连带着一脚刹车，真的很难受，这种算是我觉得真的是公交体验比较差的一点，但是这一点呢也不能完全怪公交司机，杭州的路政规划是很垃圾，没看错，是垃圾，所以总体结论是公交还行，主要是路政规划就是垃圾，包括这条主干道这么多人行道，并且两边都是老小区，老年人在上班高峰可能要买菜送娃或者其他事情，在通畅的情况下可能只需要六分钟的路程，有时候因为各种原因，半小时都开不完，扯开去一点，杭州的路，核心的高速说封就封，本来是高架可以直接通到城西，结果没造，到了路本已经很拥挤的时候开始来造隧道，各种破坏，隧道接高架的地方，无尽的加塞，对于我这样的小白司机来说真的是太恶心了，所以我一直想说的就是杭州这个地方房价领先基础设施十年，地铁，高架，高速通通不行，地面道路就更不行了。<br>总结下，其实杭州的真正的公交体验差，应该还是路造成的，对于前面的那两位妹子来说，有可能是她们来自于公交司机都是开的特别稳，并且路况也很好的地方，也或者是我被虐习惯了🤦‍♂️</p></div><footer class="post-footer"><div class="post-eof"></div></footer></article></div><div class="post-block"><article itemscope itemtype="http://schema.org/Article" class="post-content"><link itemprop="mainEntityOfPage" href="https://nicksxs.me/2021/02/21/AQS-%E4%B9%8B-Condition-%E6%B5%85%E6%9E%90%E7%AC%94%E8%AE%B0/"><span hidden itemprop="author" itemscope itemtype="http://schema.org/Person"><meta itemprop="image" content="/uploads/avatar.jpg"><meta itemprop="name" content="Nicksxs"><meta itemprop="description" content="learn from zero,技术博客，Nicksxs，史学森"></span><span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization"><meta itemprop="name" content="Nicksxs's Blog"></span><header class="post-header"><h2 class="post-title" itemprop="name headline"><a href="/2021/02/21/AQS-%E4%B9%8B-Condition-%E6%B5%85%E6%9E%90%E7%AC%94%E8%AE%B0/" class="post-title-link" itemprop="url">AQS篇二 之 Condition 浅析笔记</a></h2><div class="post-meta-container"><div class="post-meta"><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-calendar"></i> </span><span class="post-meta-item-text">Posted on</span> <time title="Created: 2021-02-21 21:27:06" itemprop="dateCreated datePublished" datetime="2021-02-21T21:27:06+08:00">2021-02-21</time> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-folder"></i> </span><span class="post-meta-item-text">In</span> <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/Java/" itemprop="url" rel="index"><span itemprop="name">Java</span></a> </span>, <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/Java/%E5%B9%B6%E5%8F%91/" itemprop="url" rel="index"><span itemprop="name">并发</span></a> </span></span><span id="/2021/02/21/AQS-%E4%B9%8B-Condition-%E6%B5%85%E6%9E%90%E7%AC%94%E8%AE%B0/" class="post-meta-item leancloud_visitors" data-flag-title="AQS篇二 之 Condition 浅析笔记" title="Views"><span class="post-meta-item-icon"><i class="far fa-eye"></i> </span><span class="post-meta-item-text">Views: </span><span class="leancloud-visitors-count"></span> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-comment"></i> </span><span class="post-meta-item-text">Disqus: </span><a title="disqus" href="/2021/02/21/AQS-%E4%B9%8B-Condition-%E6%B5%85%E6%9E%90%E7%AC%94%E8%AE%B0/#disqus_thread" itemprop="discussionUrl"><span class="post-comments-count disqus-comment-count" data-disqus-identifier="2021/02/21/AQS-之-Condition-浅析笔记/" itemprop="commentCount"></span></a></span></div></div></header><div class="post-body" itemprop="articleBody"><p>Condition也是 AQS 中很重要的一块内容，可以先看段示例代码，这段代码应该来自于Doug Lea大大，可以在 javadoc 中的 <a target="_blank" rel="noopener" href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/locks/Condition.html">condition</a> 部分找到，其实大大原来写过基于 <code>synchronized</code> 实现的，后面我也贴下代码</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">import</span> <span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>concurrent<span class="token punctuation">.</span>locks<span class="token punctuation">.</span></span><span class="token class-name">Condition</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>concurrent<span class="token punctuation">.</span>locks<span class="token punctuation">.</span></span><span class="token class-name">Lock</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>concurrent<span class="token punctuation">.</span>locks<span class="token punctuation">.</span></span><span class="token class-name">ReentrantLock</span><span class="token punctuation">;</span>
<span class="token keyword">class</span> <span class="token class-name">BoundedBuffer</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">final</span> <span class="token class-name">Lock</span> lock <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ReentrantLock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// condition 依赖于 lock 来产生</span>
<span class="token keyword">final</span> <span class="token class-name">Condition</span> notFull <span class="token operator">=</span> lock<span class="token punctuation">.</span><span class="token function">newCondition</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">final</span> <span class="token class-name">Condition</span> notEmpty <span class="token operator">=</span> lock<span class="token punctuation">.</span><span class="token function">newCondition</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 对象池子，put 跟 take 的就是这里的</span>
<span class="token keyword">final</span> <span class="token class-name">Object</span><span class="token punctuation">[</span><span class="token punctuation">]</span> items <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Object</span><span class="token punctuation">[</span><span class="token number">100</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">int</span> putptr<span class="token punctuation">,</span> takeptr<span class="token punctuation">,</span> count<span class="token punctuation">;</span>
<span class="token comment">// 生产</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">put</span><span class="token punctuation">(</span><span class="token class-name">Object</span> x<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">InterruptedException</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// 这里也说明了，需要先拥有锁</span>
lock<span class="token punctuation">.</span><span class="token function">lock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">while</span> <span class="token punctuation">(</span>count <span class="token operator">==</span> items<span class="token punctuation">.</span>length<span class="token punctuation">)</span>
notFull<span class="token punctuation">.</span><span class="token function">await</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 队列已满，等待，直到 not full 才能继续生产</span>
items<span class="token punctuation">[</span>putptr<span class="token punctuation">]</span> <span class="token operator">=</span> x<span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">++</span>putptr <span class="token operator">==</span> items<span class="token punctuation">.</span>length<span class="token punctuation">)</span> putptr <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token operator">++</span>count<span class="token punctuation">;</span>
notEmpty<span class="token punctuation">.</span><span class="token function">signal</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 生产成功，队列已经 not empty 了，发个通知出去</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">finally</span> <span class="token punctuation">&#123;</span>
lock<span class="token punctuation">.</span><span class="token function">unlock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token comment">// 消费</span>
<span class="token keyword">public</span> <span class="token class-name">Object</span> <span class="token function">take</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">InterruptedException</span> <span class="token punctuation">&#123;</span>
lock<span class="token punctuation">.</span><span class="token function">lock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">while</span> <span class="token punctuation">(</span>count <span class="token operator">==</span> <span class="token number">0</span><span class="token punctuation">)</span>
notEmpty<span class="token punctuation">.</span><span class="token function">await</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 队列为空，等待，直到队列 not empty，才能继续消费</span>
<span class="token class-name">Object</span> x <span class="token operator">=</span> items<span class="token punctuation">[</span>takeptr<span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">++</span>takeptr <span class="token operator">==</span> items<span class="token punctuation">.</span>length<span class="token punctuation">)</span> takeptr <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token operator">--</span>count<span class="token punctuation">;</span>
notFull<span class="token punctuation">.</span><span class="token function">signal</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 被我消费掉一个，队列 not full 了，发个通知出去</span>
<span class="token keyword">return</span> x<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">finally</span> <span class="token punctuation">&#123;</span>
lock<span class="token punctuation">.</span><span class="token function">unlock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>介绍下 Condition 的结构</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">ConditionObject</span> <span class="token keyword">implements</span> <span class="token class-name">Condition</span><span class="token punctuation">,</span> <span class="token class-name"><span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span>Serializable</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">private</span> <span class="token keyword">static</span> <span class="token keyword">final</span> <span class="token keyword">long</span> serialVersionUID <span class="token operator">=</span> <span class="token number">1173984872572414699L</span><span class="token punctuation">;</span>
<span class="token comment">/** First node of condition queue. */</span>
<span class="token keyword">private</span> <span class="token keyword">transient</span> <span class="token class-name">Node</span> firstWaiter<span class="token punctuation">;</span>
<span class="token comment">/** Last node of condition queue. */</span>
<span class="token keyword">private</span> <span class="token keyword">transient</span> <span class="token class-name">Node</span> lastWaiter<span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>主要的就这么点，而且也复用了 AQS 阻塞队列或者大大叫 <code>lock queue</code>中同样的 Node 节点，只不过它没有使用其中的双向队列，也就是prev 和 next，而是在 Node 中的 nextWaiter，所以只是个单向的队列，没使用 next 其实还有个用处，后面会提到，看下结构的示意图<br><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/Ss9oFX.png"><br>然后主要是看两个方法，<code>await</code> 和 <code>signal</code>,<br>先来看下 await</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">/**
* Implements interruptible condition wait.
* &lt;ol>
* &lt;li> If current thread is interrupted, throw InterruptedException.
* &lt;li> Save lock state returned by &#123;@link #getState&#125;.
* &lt;li> Invoke &#123;@link #release&#125; with saved state as argument,
* throwing IllegalMonitorStateException if it fails.
* &lt;li> Block until signalled or interrupted.
* &lt;li> Reacquire by invoking specialized version of
* &#123;@link #acquire&#125; with saved state as argument.
* &lt;li> If interrupted while blocked in step 4, throw InterruptedException.
* &lt;/ol>
*/</span>
<span class="token keyword">public</span> <span class="token keyword">final</span> <span class="token keyword">void</span> <span class="token function">await</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">InterruptedException</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">interrupted</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">InterruptedException</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 将当前节点包装成一个 condition waiter node 节点</span>
<span class="token class-name">Node</span> node <span class="token operator">=</span> <span class="token function">addConditionWaiter</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 完全释放占有的锁，这里需要是占有锁的线程</span>
<span class="token keyword">int</span> savedState <span class="token operator">=</span> <span class="token function">fullyRelease</span><span class="token punctuation">(</span>node<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">int</span> interruptMode <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token comment">// 判断下是否在阻塞队列中，因为有可能被其他节点从等待队列移动到阻塞队列</span>
<span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token operator">!</span><span class="token function">isOnSyncQueue</span><span class="token punctuation">(</span>node<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// park等待，等待被唤醒</span>
<span class="token class-name">LockSupport</span><span class="token punctuation">.</span><span class="token function">park</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token punctuation">(</span>interruptMode <span class="token operator">=</span> <span class="token function">checkInterruptWhileWaiting</span><span class="token punctuation">(</span>node<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token operator">!=</span> <span class="token number">0</span><span class="token punctuation">)</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token comment">// 被唤醒后进入阻塞队列，等待获取锁，这里继续用了fullyRelease返回的 state</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">acquireQueued</span><span class="token punctuation">(</span>node<span class="token punctuation">,</span> savedState<span class="token punctuation">)</span> <span class="token operator">&amp;&amp;</span> interruptMode <span class="token operator">!=</span> THROW_IE<span class="token punctuation">)</span>
interruptMode <span class="token operator">=</span> REINTERRUPT<span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>node<span class="token punctuation">.</span>nextWaiter <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token comment">// clean up if cancelled</span>
<span class="token function">unlinkCancelledWaiters</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>interruptMode <span class="token operator">!=</span> <span class="token number">0</span><span class="token punctuation">)</span>
<span class="token function">reportInterruptAfterWait</span><span class="token punctuation">(</span>interruptMode<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>添加条件队列节点</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">/**
* Adds a new waiter to wait queue.
* @return its new wait node
*/</span>
<span class="token keyword">private</span> <span class="token class-name">Node</span> <span class="token function">addConditionWaiter</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">Node</span> t <span class="token operator">=</span> lastWaiter<span class="token punctuation">;</span>
<span class="token comment">// If lastWaiter is cancelled, clean out.</span>
<span class="token comment">// 如果节点已经不是 CONDITION 状态了，表示已经取消了</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>t <span class="token operator">!=</span> <span class="token keyword">null</span> <span class="token operator">&amp;&amp;</span> t<span class="token punctuation">.</span>waitStatus <span class="token operator">!=</span> <span class="token class-name">Node</span><span class="token punctuation">.</span>CONDITION<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// 把等待队列中取消的节点清理出去</span>
<span class="token function">unlinkCancelledWaiters</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
t <span class="token operator">=</span> lastWaiter<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token comment">// 把当前线程包装成waitStatus=CONDITION 的节点</span>
<span class="token class-name">Node</span> node <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Node</span><span class="token punctuation">(</span><span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">currentThread</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token class-name">Node</span><span class="token punctuation">.</span>CONDITION<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 没有 lastWaiter 节点，直接是 firstWaiter</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>t <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span>
firstWaiter <span class="token operator">=</span> node<span class="token punctuation">;</span>
<span class="token keyword">else</span>
<span class="token comment">// 不然就接在 lastWaiter 后面</span>
t<span class="token punctuation">.</span>nextWaiter <span class="token operator">=</span> node<span class="token punctuation">;</span>
<span class="token comment">// 当前节点就会变成新的 lastWaiter</span>
lastWaiter <span class="token operator">=</span> node<span class="token punctuation">;</span>
<span class="token keyword">return</span> node<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>清理取消的节点</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">/**
* Unlinks cancelled waiter nodes from condition queue.
* Called only while holding lock. This is called when
* cancellation occurred during condition wait, and upon
* insertion of a new waiter when lastWaiter is seen to have
* been cancelled. This method is needed to avoid garbage
* retention in the absence of signals. So even though it may
* require a full traversal, it comes into play only when
* timeouts or cancellations occur in the absence of
* signals. It traverses all nodes rather than stopping at a
* particular target to unlink all pointers to garbage nodes
* without requiring many re-traversals during cancellation
* storms.
*/</span>
<span class="token keyword">private</span> <span class="token keyword">void</span> <span class="token function">unlinkCancelledWaiters</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">Node</span> t <span class="token operator">=</span> firstWaiter<span class="token punctuation">;</span>
<span class="token class-name">Node</span> trail <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token comment">// 循环遍历单向链表的节点，如果状态不是 CONDITION 就清出去</span>
<span class="token keyword">while</span> <span class="token punctuation">(</span>t <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">Node</span> next <span class="token operator">=</span> t<span class="token punctuation">.</span>nextWaiter<span class="token punctuation">;</span>
<span class="token comment">// 循环链表操作，清掉取消的节点</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>t<span class="token punctuation">.</span>waitStatus <span class="token operator">!=</span> <span class="token class-name">Node</span><span class="token punctuation">.</span>CONDITION<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
t<span class="token punctuation">.</span>nextWaiter <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>trail <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span>
firstWaiter <span class="token operator">=</span> next<span class="token punctuation">;</span>
<span class="token keyword">else</span>
trail<span class="token punctuation">.</span>nextWaiter <span class="token operator">=</span> next<span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>next <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span>
lastWaiter <span class="token operator">=</span> trail<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">else</span>
trail <span class="token operator">=</span> t<span class="token punctuation">;</span>
t <span class="token operator">=</span> next<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>完全释放锁</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">/**
* Invokes release with current state value; returns saved state.
* Cancels node and throws exception on failure.
* @param node the condition node for this wait
* @return previous sync state
*/</span>
<span class="token keyword">final</span> <span class="token keyword">int</span> <span class="token function">fullyRelease</span><span class="token punctuation">(</span><span class="token class-name">Node</span> node<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">boolean</span> failed <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// 获取下当前的 state 值，因为是可重入的，所以这个值要保存下来</span>
<span class="token keyword">int</span> savedState <span class="token operator">=</span> <span class="token function">getState</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 这里还包含比较多操作，不过跟前面分析 AQS 的释放比较类似，不深入了</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">release</span><span class="token punctuation">(</span>savedState<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
failed <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
<span class="token comment">// 返回这个值</span>
<span class="token keyword">return</span> savedState<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">IllegalMonitorStateException</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">finally</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>failed<span class="token punctuation">)</span>
node<span class="token punctuation">.</span>waitStatus <span class="token operator">=</span> <span class="token class-name">Node</span><span class="token punctuation">.</span>CANCELLED<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>判断是否在阻塞队列中</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">/**
* Returns true if a node, always one that was initially placed on
* a condition queue, is now waiting to reacquire on sync queue.
* @param node the node
* @return true if is reacquiring
*/</span>
<span class="token keyword">final</span> <span class="token keyword">boolean</span> <span class="token function">isOnSyncQueue</span><span class="token punctuation">(</span><span class="token class-name">Node</span> node<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// 如果waitStatus 是 CONDITION 或者没有 prev 前置节点肯定就不在</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>node<span class="token punctuation">.</span>waitStatus <span class="token operator">==</span> <span class="token class-name">Node</span><span class="token punctuation">.</span>CONDITION <span class="token operator">||</span> node<span class="token punctuation">.</span>prev <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span>
<span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
<span class="token comment">// 这里就是我前面提到的 next 的作用</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>node<span class="token punctuation">.</span>next <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token comment">// If has successor, it must be on queue</span>
<span class="token keyword">return</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token comment">// 从 tail 开始找，是否在阻塞队列中</span>
<span class="token comment">/*
* node.prev can be non-null, but not yet on queue because
* the CAS to place it on queue can fail. So we have to
* traverse from tail to make sure it actually made it. It
* will always be near the tail in calls to this method, and
* unless the CAS failed (which is unlikely), it will be
* there, so we hardly ever traverse much.
*/</span>
<span class="token keyword">return</span> <span class="token function">findNodeFromTail</span><span class="token punctuation">(</span>node<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token comment">/**
* Returns true if node is on sync queue by searching backwards from tail.
* Called only when needed by isOnSyncQueue.
* @return true if present
*/</span>
<span class="token keyword">private</span> <span class="token keyword">boolean</span> <span class="token function">findNodeFromTail</span><span class="token punctuation">(</span><span class="token class-name">Node</span> node<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">Node</span> t <span class="token operator">=</span> tail<span class="token punctuation">;</span>
<span class="token comment">// 从 tail 开始，从后往前找</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token punctuation">;</span><span class="token punctuation">;</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>t <span class="token operator">==</span> node<span class="token punctuation">)</span>
<span class="token keyword">return</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>t <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span>
<span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
t <span class="token operator">=</span> t<span class="token punctuation">.</span>prev<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>await 的逻辑差不多就是这样子，主要的就是把自己包成一个 Node 节点，waitStatus 的状态是 CONDITION，挂在等待队列的最后，然后完全释放锁，park 等待</p><h2 id="signal"><a href="#signal" class="headerlink" title="signal"></a>signal</h2><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">/**
* Moves the longest-waiting thread, if one exists, from the
* wait queue for this condition to the wait queue for the
* owning lock.
*
* @throws IllegalMonitorStateException if &#123;@link #isHeldExclusively&#125;
* returns &#123;@code false&#125;
*/</span>
<span class="token keyword">public</span> <span class="token keyword">final</span> <span class="token keyword">void</span> <span class="token function">signal</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span><span class="token function">isHeldExclusively</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">IllegalMonitorStateException</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// firstWaiter 肯定是最早开始等待的</span>
<span class="token class-name">Node</span> first <span class="token operator">=</span> firstWaiter<span class="token punctuation">;</span>
<span class="token comment">// 如果不为空就唤醒</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>first <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span>
<span class="token function">doSignal</span><span class="token punctuation">(</span>first<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token comment">/**
* Removes and transfers nodes until hit non-cancelled one or
* null. Split out from signal in part to encourage compilers
* to inline the case of no waiters.
* @param first (non-null) the first node on condition queue
*/</span>
<span class="token keyword">private</span> <span class="token keyword">void</span> <span class="token function">doSignal</span><span class="token punctuation">(</span><span class="token class-name">Node</span> first<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">do</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// 因为要去唤醒 first 节点了，firstWaiter 需要再从后面找一个</span>
<span class="token comment">// 并且判断是否为空，如果是空的话就直接可以把 lastWaiter 设置成空了</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span> <span class="token punctuation">(</span>firstWaiter <span class="token operator">=</span> first<span class="token punctuation">.</span>nextWaiter<span class="token punctuation">)</span> <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span>
lastWaiter <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token comment">// first 不需要继续保存后面的 waiter 了，因为 firstWaiter 已经是 first 的后置节点了</span>
first<span class="token punctuation">.</span>nextWaiter <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token comment">// 如果 first 节点转移不成功，并且 firstWaiter 节点不为空，则继续进入循环</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token operator">!</span><span class="token function">transferForSignal</span><span class="token punctuation">(</span>first<span class="token punctuation">)</span> <span class="token operator">&amp;&amp;</span>
<span class="token punctuation">(</span>first <span class="token operator">=</span> firstWaiter<span class="token punctuation">)</span> <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token comment">/**
* Transfers a node from a condition queue onto sync queue.
* Returns true if successful.
* @param node the node
* @return true if successfully transferred (else the node was
* cancelled before signal)
*/</span>
<span class="token keyword">final</span> <span class="token keyword">boolean</span> <span class="token function">transferForSignal</span><span class="token punctuation">(</span><span class="token class-name">Node</span> node<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token comment">/*
* If cannot change waitStatus, the node has been cancelled.
*/</span>
<span class="token comment">// 如果状态已经不是 CONDITION 就不会设置成功，返回 false</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span><span class="token function">compareAndSetWaitStatus</span><span class="token punctuation">(</span>node<span class="token punctuation">,</span> <span class="token class-name">Node</span><span class="token punctuation">.</span>CONDITION<span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
<span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
<span class="token comment">/*
* Splice onto queue and try to set waitStatus of predecessor to
* indicate that thread is (probably) waiting. If cancelled or
* attempt to set waitStatus fails, wake up to resync (in which
* case the waitStatus can be transiently and harmlessly wrong).
*/</span>
<span class="token comment">// 调用跟aqs 第一篇中一样的 enq 方法进入阻塞队列，返回入队后的前一节点</span>
<span class="token class-name">Node</span> p <span class="token operator">=</span> <span class="token function">enq</span><span class="token punctuation">(</span>node<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">int</span> ws <span class="token operator">=</span> p<span class="token punctuation">.</span>waitStatus<span class="token punctuation">;</span>
<span class="token comment">// 将前置节点状态设置成SIGNAL，表示后面有节点在等了</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>ws <span class="token operator">></span> <span class="token number">0</span> <span class="token operator">||</span> <span class="token operator">!</span><span class="token function">compareAndSetWaitStatus</span><span class="token punctuation">(</span>p<span class="token punctuation">,</span> ws<span class="token punctuation">,</span> <span class="token class-name">Node</span><span class="token punctuation">.</span>SIGNAL<span class="token punctuation">)</span><span class="token punctuation">)</span>
<span class="token class-name">LockSupport</span><span class="token punctuation">.</span><span class="token function">unpark</span><span class="token punctuation">(</span>node<span class="token punctuation">.</span>thread<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 返回 true，上一个方法的循环就退出了</span>
<span class="token keyword">return</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>这里其实就是把 condition 等待队列的第一个未取消的节点入队到阻塞队列去争锁</p><h2 id="附录"><a href="#附录" class="headerlink" title="附录"></a>附录</h2><p><code>synchronized</code> 版的 BoundedBuffer</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">/*
File: BoundedBuffer.java
Originally written by Doug Lea and released into the public domain.
This may be used for any purposes whatsoever without acknowledgment.
Thanks for the assistance and support of Sun Microsystems Labs,
and everyone contributing, testing, and using this code.
History:
Date Who What
11Jun1998 dl Create public version
17Jul1998 dl Simplified by eliminating wait counts
25aug1998 dl added peek
5May1999 dl replace % with conditional (slightly faster)
*/</span>
<span class="token keyword">package</span> EDU<span class="token punctuation">.</span>oswego<span class="token punctuation">.</span>cs<span class="token punctuation">.</span>dl<span class="token punctuation">.</span>util<span class="token punctuation">.</span>concurrent<span class="token punctuation">;</span>
<span class="token comment">/**
* Efficient array-based bounded buffer class.
* Adapted from CPJ, chapter 8, which describes design.
* &lt;p>[&lt;a href="http://gee.cs.oswego.edu/dl/classes/EDU/oswego/cs/dl/util/concurrent/intro.html"> Introduction to this package. &lt;/a>] &lt;p>
**/</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">BoundedBuffer</span> <span class="token keyword">implements</span> <span class="token class-name">BoundedChannel</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">protected</span> <span class="token keyword">final</span> <span class="token class-name">Object</span><span class="token punctuation">[</span><span class="token punctuation">]</span> array_<span class="token punctuation">;</span> <span class="token comment">// the elements</span>
<span class="token keyword">protected</span> <span class="token keyword">int</span> takePtr_ <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> <span class="token comment">// circular indices</span>
<span class="token keyword">protected</span> <span class="token keyword">int</span> putPtr_ <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token keyword">protected</span> <span class="token keyword">int</span> usedSlots_ <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> <span class="token comment">// length</span>
<span class="token keyword">protected</span> <span class="token keyword">int</span> emptySlots_<span class="token punctuation">;</span> <span class="token comment">// capacity - length</span>
<span class="token comment">/**
* Helper monitor to handle puts.
**/</span>
<span class="token keyword">protected</span> <span class="token keyword">final</span> <span class="token class-name">Object</span> putMonitor_ <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Object</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">/**
* Create a BoundedBuffer with the given capacity.
* @exception IllegalArgumentException if capacity less or equal to zero
**/</span>
<span class="token keyword">public</span> <span class="token class-name">BoundedBuffer</span><span class="token punctuation">(</span><span class="token keyword">int</span> capacity<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">IllegalArgumentException</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>capacity <span class="token operator">&lt;=</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">IllegalArgumentException</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
array_ <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Object</span><span class="token punctuation">[</span>capacity<span class="token punctuation">]</span><span class="token punctuation">;</span>
emptySlots_ <span class="token operator">=</span> capacity<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token comment">/**
* Create a buffer with the current default capacity
**/</span>
<span class="token keyword">public</span> <span class="token class-name">BoundedBuffer</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">this</span><span class="token punctuation">(</span><span class="token class-name">DefaultChannelCapacity</span><span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token comment">/**
* Return the number of elements in the buffer.
* This is only a snapshot value, that may change
* immediately after returning.
**/</span>
<span class="token keyword">public</span> <span class="token keyword">synchronized</span> <span class="token keyword">int</span> <span class="token function">size</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span> <span class="token keyword">return</span> usedSlots_<span class="token punctuation">;</span> <span class="token punctuation">&#125;</span>
<span class="token keyword">public</span> <span class="token keyword">int</span> <span class="token function">capacity</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span> <span class="token keyword">return</span> array_<span class="token punctuation">.</span>length<span class="token punctuation">;</span> <span class="token punctuation">&#125;</span>
<span class="token keyword">protected</span> <span class="token keyword">void</span> <span class="token function">incEmptySlots</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">synchronized</span><span class="token punctuation">(</span>putMonitor_<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token operator">++</span>emptySlots_<span class="token punctuation">;</span>
putMonitor_<span class="token punctuation">.</span><span class="token function">notify</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">protected</span> <span class="token keyword">synchronized</span> <span class="token keyword">void</span> <span class="token function">incUsedSlots</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token operator">++</span>usedSlots_<span class="token punctuation">;</span>
<span class="token function">notify</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">protected</span> <span class="token keyword">final</span> <span class="token keyword">void</span> <span class="token function">insert</span><span class="token punctuation">(</span><span class="token class-name">Object</span> x<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span> <span class="token comment">// mechanics of put</span>
<span class="token operator">--</span>emptySlots_<span class="token punctuation">;</span>
array_<span class="token punctuation">[</span>putPtr_<span class="token punctuation">]</span> <span class="token operator">=</span> x<span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">++</span>putPtr_ <span class="token operator">>=</span> array_<span class="token punctuation">.</span>length<span class="token punctuation">)</span> putPtr_ <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">protected</span> <span class="token keyword">final</span> <span class="token class-name">Object</span> <span class="token function">extract</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span> <span class="token comment">// mechanics of take</span>
<span class="token operator">--</span>usedSlots_<span class="token punctuation">;</span>
<span class="token class-name">Object</span> old <span class="token operator">=</span> array_<span class="token punctuation">[</span>takePtr_<span class="token punctuation">]</span><span class="token punctuation">;</span>
array_<span class="token punctuation">[</span>takePtr_<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">++</span>takePtr_ <span class="token operator">>=</span> array_<span class="token punctuation">.</span>length<span class="token punctuation">)</span> takePtr_ <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> old<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">public</span> <span class="token class-name">Object</span> <span class="token function">peek</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">synchronized</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>usedSlots_ <span class="token operator">></span> <span class="token number">0</span><span class="token punctuation">)</span>
<span class="token keyword">return</span> array_<span class="token punctuation">[</span>takePtr_<span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">else</span>
<span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">put</span><span class="token punctuation">(</span><span class="token class-name">Object</span> x<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">InterruptedException</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>x <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">IllegalArgumentException</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">interrupted</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">InterruptedException</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">synchronized</span><span class="token punctuation">(</span>putMonitor_<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">while</span> <span class="token punctuation">(</span>emptySlots_ <span class="token operator">&lt;=</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span> putMonitor_<span class="token punctuation">.</span><span class="token function">wait</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token punctuation">&#125;</span>
<span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">InterruptedException</span> ex<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
putMonitor_<span class="token punctuation">.</span><span class="token function">notify</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">throw</span> ex<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token function">insert</span><span class="token punctuation">(</span>x<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token function">incUsedSlots</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">public</span> <span class="token keyword">boolean</span> <span class="token function">offer</span><span class="token punctuation">(</span><span class="token class-name">Object</span> x<span class="token punctuation">,</span> <span class="token keyword">long</span> msecs<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">InterruptedException</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>x <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">IllegalArgumentException</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">interrupted</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">InterruptedException</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">synchronized</span><span class="token punctuation">(</span>putMonitor_<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">long</span> start <span class="token operator">=</span> <span class="token punctuation">(</span>msecs <span class="token operator">&lt;=</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token operator">?</span> <span class="token number">0</span> <span class="token operator">:</span> <span class="token class-name">System</span><span class="token punctuation">.</span><span class="token function">currentTimeMillis</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">long</span> waitTime <span class="token operator">=</span> msecs<span class="token punctuation">;</span>
<span class="token keyword">while</span> <span class="token punctuation">(</span>emptySlots_ <span class="token operator">&lt;=</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>waitTime <span class="token operator">&lt;=</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span> putMonitor_<span class="token punctuation">.</span><span class="token function">wait</span><span class="token punctuation">(</span>waitTime<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token punctuation">&#125;</span>
<span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">InterruptedException</span> ex<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
putMonitor_<span class="token punctuation">.</span><span class="token function">notify</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">throw</span> ex<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
waitTime <span class="token operator">=</span> msecs <span class="token operator">-</span> <span class="token punctuation">(</span><span class="token class-name">System</span><span class="token punctuation">.</span><span class="token function">currentTimeMillis</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">-</span> start<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token function">insert</span><span class="token punctuation">(</span>x<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token function">incUsedSlots</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">public</span> <span class="token class-name">Object</span> <span class="token function">take</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">InterruptedException</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">interrupted</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">InterruptedException</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">Object</span> old <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token keyword">synchronized</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">while</span> <span class="token punctuation">(</span>usedSlots_ <span class="token operator">&lt;=</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span> <span class="token function">wait</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token punctuation">&#125;</span>
<span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">InterruptedException</span> ex<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token function">notify</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">throw</span> ex<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
old <span class="token operator">=</span> <span class="token function">extract</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token function">incEmptySlots</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> old<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">public</span> <span class="token class-name">Object</span> <span class="token function">poll</span><span class="token punctuation">(</span><span class="token keyword">long</span> msecs<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">InterruptedException</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">interrupted</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">InterruptedException</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">Object</span> old <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token keyword">synchronized</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">long</span> start <span class="token operator">=</span> <span class="token punctuation">(</span>msecs <span class="token operator">&lt;=</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token operator">?</span> <span class="token number">0</span> <span class="token operator">:</span> <span class="token class-name">System</span><span class="token punctuation">.</span><span class="token function">currentTimeMillis</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">long</span> waitTime <span class="token operator">=</span> msecs<span class="token punctuation">;</span>
<span class="token keyword">while</span> <span class="token punctuation">(</span>usedSlots_ <span class="token operator">&lt;=</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>waitTime <span class="token operator">&lt;=</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span> <span class="token function">wait</span><span class="token punctuation">(</span>waitTime<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token punctuation">&#125;</span>
<span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">InterruptedException</span> ex<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token function">notify</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">throw</span> ex<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
waitTime <span class="token operator">=</span> msecs <span class="token operator">-</span> <span class="token punctuation">(</span><span class="token class-name">System</span><span class="token punctuation">.</span><span class="token function">currentTimeMillis</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">-</span> start<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
old <span class="token operator">=</span> <span class="token function">extract</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token function">incEmptySlots</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> old<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
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