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<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 href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/locks/Condition.html" target="_blank" rel="noopener">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>
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<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> java.util.concurrent.locks.Condition;</span><br><span class="line"><span class="keyword">import</span> java.util.concurrent.locks.Lock;</span><br><span class="line"><span class="keyword">import</span> java.util.concurrent.locks.ReentrantLock;</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">BoundedBuffer</span> </span>{</span><br><span class="line"> <span class="keyword">final</span> Lock lock = <span class="keyword">new</span> ReentrantLock();</span><br><span class="line"> <span class="comment">// condition 依赖于 lock 来产生</span></span><br><span class="line"> <span class="keyword">final</span> Condition notFull = lock.newCondition();</span><br><span class="line"> <span class="keyword">final</span> Condition notEmpty = lock.newCondition();</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 对象池子，put 跟 take 的就是这里的</span></span><br><span class="line"> <span class="keyword">final</span> Object[] items = <span class="keyword">new</span> Object[<span class="number">100</span>];</span><br><span class="line"> <span class="keyword">int</span> putptr, takeptr, count;</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 生产</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">put</span><span class="params">(Object x)</span> <span class="keyword">throws</span> InterruptedException </span>{</span><br><span class="line"> <span class="comment">// 这里也说明了，需要先拥有锁</span></span><br><span class="line"> lock.lock();</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> <span class="keyword">while</span> (count == items.length)</span><br><span class="line"> notFull.await(); <span class="comment">// 队列已满，等待，直到 not full 才能继续生产</span></span><br><span class="line"> items[putptr] = x;</span><br><span class="line"> <span class="keyword">if</span> (++putptr == items.length) putptr = <span class="number">0</span>;</span><br><span class="line"> ++count;</span><br><span class="line"> notEmpty.signal(); <span class="comment">// 生产成功，队列已经 not empty 了，发个通知出去</span></span><br><span class="line"> } <span class="keyword">finally</span> {</span><br><span class="line"> lock.unlock();</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 消费</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> Object <span class="title">take</span><span class="params">()</span> <span class="keyword">throws</span> InterruptedException </span>{</span><br><span class="line"> lock.lock();</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> <span class="keyword">while</span> (count == <span class="number">0</span>)</span><br><span class="line"> notEmpty.await(); <span class="comment">// 队列为空，等待，直到队列 not empty，才能继续消费</span></span><br><span class="line"> Object x = items[takeptr];</span><br><span class="line"> <span class="keyword">if</span> (++takeptr == items.length) takeptr = <span class="number">0</span>;</span><br><span class="line"> --count;</span><br><span class="line"> notFull.signal(); <span class="comment">// 被我消费掉一个，队列 not full 了，发个通知出去</span></span><br><span class="line"> <span class="keyword">return</span> x;</span><br><span class="line"> } <span class="keyword">finally</span> {</span><br><span class="line"> lock.unlock();</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<p>介绍下 Condition 的结构</p>
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<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">ConditionObject</span> <span class="keyword">implements</span> <span class="title">Condition</span>, <span class="title">java</span>.<span class="title">io</span>.<span class="title">Serializable</span> </span>{</span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> <span class="keyword">long</span> serialVersionUID = <span class="number">1173984872572414699L</span>;</span><br><span class="line"> <span class="comment">/** First node of condition queue. */</span></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">transient</span> Node firstWaiter;</span><br><span class="line"> <span class="comment">/** Last node of condition queue. */</span></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">transient</span> Node lastWaiter;</span><br></pre></td></tr></table></figure>
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<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" alt=""><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>
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<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Implements interruptible condition wait.</span></span><br><span class="line"><span class="comment"> * <ol></span></span><br><span class="line"><span class="comment"> * <li> If current thread is interrupted, throw InterruptedException.</span></span><br><span class="line"><span class="comment"> * <li> Save lock state returned by {<span class="doctag">@link</span> #getState}.</span></span><br><span class="line"><span class="comment"> * <li> Invoke {<span class="doctag">@link</span> #release} with saved state as argument,</span></span><br><span class="line"><span class="comment"> * throwing IllegalMonitorStateException if it fails.</span></span><br><span class="line"><span class="comment"> * <li> Block until signalled or interrupted.</span></span><br><span class="line"><span class="comment"> * <li> Reacquire by invoking specialized version of</span></span><br><span class="line"><span class="comment"> * {<span class="doctag">@link</span> #acquire} with saved state as argument.</span></span><br><span class="line"><span class="comment"> * <li> If interrupted while blocked in step 4, throw InterruptedException.</span></span><br><span class="line"><span class="comment"> * </ol></span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">final</span> <span class="keyword">void</span> <span class="title">await</span><span class="params">()</span> <span class="keyword">throws</span> InterruptedException </span>{</span><br><span class="line"> <span class="keyword">if</span> (Thread.interrupted())</span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> InterruptedException();</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 将当前节点包装成一个 condition waiter node 节点</span></span><br><span class="line"> Node node = addConditionWaiter();</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 完全释放占有的锁，这里需要是占有锁的线程</span></span><br><span class="line"> <span class="keyword">int</span> savedState = fullyRelease(node);</span><br><span class="line"> <span class="keyword">int</span> interruptMode = <span class="number">0</span>;</span><br><span class="line"></span><br><span class="line"> <span class="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><br><span class="line"> <span class="keyword">while</span> (!isOnSyncQueue(node)) {</span><br><span class="line"> <span class="comment">// park等待，等待被唤醒</span></span><br><span class="line"> LockSupport.park(<span class="keyword">this</span>);</span><br><span class="line"> <span class="keyword">if</span> ((interruptMode = checkInterruptWhileWaiting(node)) != <span class="number">0</span>)</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="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><br><span class="line"> <span class="keyword">if</span> (acquireQueued(node, savedState) && interruptMode != THROW_IE)</span><br><span class="line"> interruptMode = REINTERRUPT;</span><br><span class="line"> <span class="keyword">if</span> (node.nextWaiter != <span class="keyword">null</span>) <span class="comment">// clean up if cancelled</span></span><br><span class="line"> unlinkCancelledWaiters();</span><br><span class="line"> <span class="keyword">if</span> (interruptMode != <span class="number">0</span>)</span><br><span class="line"> reportInterruptAfterWait(interruptMode);</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<p> 添加条件队列节点</p>
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<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Adds a new waiter to wait queue.</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@return</span> its new wait node</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="function"><span class="keyword">private</span> Node <span class="title">addConditionWaiter</span><span class="params">()</span> </span>{</span><br><span class="line"> Node t = lastWaiter;</span><br><span class="line"> <span class="comment">// If lastWaiter is cancelled, clean out.</span></span><br><span class="line"> <span class="comment">// 如果节点已经不是 CONDITION 状态了，表示已经取消了</span></span><br><span class="line"> <span class="keyword">if</span> (t != <span class="keyword">null</span> && t.waitStatus != Node.CONDITION) {</span><br><span class="line"> <span class="comment">// 把等待队列中取消的节点清理出去</span></span><br><span class="line"> unlinkCancelledWaiters();</span><br><span class="line"> t = lastWaiter;</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">// 把当前线程包装成waitStatus=CONDITION 的节点</span></span><br><span class="line"> Node node = <span class="keyword">new</span> Node(Thread.currentThread(), Node.CONDITION);</span><br><span class="line"> <span class="comment">// 没有 lastWaiter 节点，直接是 firstWaiter</span></span><br><span class="line"> <span class="keyword">if</span> (t == <span class="keyword">null</span>)</span><br><span class="line"> firstWaiter = node;</span><br><span class="line"> <span class="keyword">else</span></span><br><span class="line"> <span class="comment">// 不然就接在 lastWaiter 后面</span></span><br><span class="line"> t.nextWaiter = node;</span><br><span class="line"> <span class="comment">// 当前节点就会变成新的 lastWaiter</span></span><br><span class="line"> lastWaiter = node;</span><br><span class="line"> <span class="keyword">return</span> node;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<p>清理取消的节点</p>
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<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Unlinks cancelled waiter nodes from condition queue.</span></span><br><span class="line"><span class="comment"> * Called only while holding lock. This is called when</span></span><br><span class="line"><span class="comment"> * cancellation occurred during condition wait, and upon</span></span><br><span class="line"><span class="comment"> * insertion of a new waiter when lastWaiter is seen to have</span></span><br><span class="line"><span class="comment"> * been cancelled. This method is needed to avoid garbage</span></span><br><span class="line"><span class="comment"> * retention in the absence of signals. So even though it may</span></span><br><span class="line"><span class="comment"> * require a full traversal, it comes into play only when</span></span><br><span class="line"><span class="comment"> * timeouts or cancellations occur in the absence of</span></span><br><span class="line"><span class="comment"> * signals. It traverses all nodes rather than stopping at a</span></span><br><span class="line"><span class="comment"> * particular target to unlink all pointers to garbage nodes</span></span><br><span class="line"><span class="comment"> * without requiring many re-traversals during cancellation</span></span><br><span class="line"><span class="comment"> * storms.</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="function"><span class="keyword">private</span> <span class="keyword">void</span> <span class="title">unlinkCancelledWaiters</span><span class="params">()</span> </span>{</span><br><span class="line"> Node t = firstWaiter;</span><br><span class="line"> Node trail = <span class="keyword">null</span>;</span><br><span class="line"> <span class="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><br><span class="line"> <span class="keyword">while</span> (t != <span class="keyword">null</span>) {</span><br><span class="line"> Node next = t.nextWaiter;</span><br><span class="line"> <span class="comment">// 循环链表操作，清掉取消的节点</span></span><br><span class="line"> <span class="keyword">if</span> (t.waitStatus != Node.CONDITION) {</span><br><span class="line"> t.nextWaiter = <span class="keyword">null</span>;</span><br><span class="line"> <span class="keyword">if</span> (trail == <span class="keyword">null</span>)</span><br><span class="line"> firstWaiter = next;</span><br><span class="line"> <span class="keyword">else</span></span><br><span class="line"> trail.nextWaiter = next;</span><br><span class="line"> <span class="keyword">if</span> (next == <span class="keyword">null</span>)</span><br><span class="line"> lastWaiter = trail;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">else</span></span><br><span class="line"> trail = t;</span><br><span class="line"> t = next;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<p>完全释放锁</p>
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<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Invokes release with current state value; returns saved state.</span></span><br><span class="line"><span class="comment"> * Cancels node and throws exception on failure.</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@param</span> node the condition node for this wait</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@return</span> previous sync state</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="function"><span class="keyword">final</span> <span class="keyword">int</span> <span class="title">fullyRelease</span><span class="params">(Node node)</span> </span>{</span><br><span class="line"> <span class="keyword">boolean</span> failed = <span class="keyword">true</span>;</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> <span class="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><br><span class="line"> <span class="keyword">int</span> savedState = getState();</span><br><span class="line"> <span class="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><br><span class="line"> <span class="keyword">if</span> (release(savedState)) {</span><br><span class="line"> failed = <span class="keyword">false</span>;</span><br><span class="line"> <span class="comment">// 返回这个值</span></span><br><span class="line"> <span class="keyword">return</span> savedState;</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> IllegalMonitorStateException();</span><br><span class="line"> }</span><br><span class="line"> } <span class="keyword">finally</span> {</span><br><span class="line"> <span class="keyword">if</span> (failed)</span><br><span class="line"> node.waitStatus = Node.CANCELLED;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<p>判断是否在阻塞队列中</p>
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<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Returns true if a node, always one that was initially placed on</span></span><br><span class="line"><span class="comment"> * a condition queue, is now waiting to reacquire on sync queue.</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@param</span> node the node</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@return</span> true if is reacquiring</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="function"><span class="keyword">final</span> <span class="keyword">boolean</span> <span class="title">isOnSyncQueue</span><span class="params">(Node node)</span> </span>{</span><br><span class="line"> <span class="comment">// 如果waitStatus 是 CONDITION 或者没有 prev 前置节点肯定就不在</span></span><br><span class="line"> <span class="keyword">if</span> (node.waitStatus == Node.CONDITION || node.prev == <span class="keyword">null</span>)</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line"> <span class="comment">// 这里就是我前面提到的 next 的作用</span></span><br><span class="line"> <span class="keyword">if</span> (node.next != <span class="keyword">null</span>) <span class="comment">// If has successor, it must be on queue</span></span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line"> <span class="comment">// 从 tail 开始找，是否在阻塞队列中</span></span><br><span class="line"> <span class="comment">/*</span></span><br><span class="line"><span class="comment"> * node.prev can be non-null, but not yet on queue because</span></span><br><span class="line"><span class="comment"> * the CAS to place it on queue can fail. So we have to</span></span><br><span class="line"><span class="comment"> * traverse from tail to make sure it actually made it. It</span></span><br><span class="line"><span class="comment"> * will always be near the tail in calls to this method, and</span></span><br><span class="line"><span class="comment"> * unless the CAS failed (which is unlikely), it will be</span></span><br><span class="line"><span class="comment"> * there, so we hardly ever traverse much.</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">return</span> findNodeFromTail(node);</span><br><span class="line">}</span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Returns true if node is on sync queue by searching backwards from tail.</span></span><br><span class="line"><span class="comment"> * Called only when needed by isOnSyncQueue.</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@return</span> true if present</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="function"><span class="keyword">private</span> <span class="keyword">boolean</span> <span class="title">findNodeFromTail</span><span class="params">(Node node)</span> </span>{</span><br><span class="line"> Node t = tail;</span><br><span class="line"> <span class="comment">// 从 tail 开始，从后往前找</span></span><br><span class="line"> <span class="keyword">for</span> (;;) {</span><br><span class="line"> <span class="keyword">if</span> (t == node)</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line"> <span class="keyword">if</span> (t == <span class="keyword">null</span>)</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line"> t = t.prev;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<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>
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<h2 id="signal"><a href="#signal" class="headerlink" title="signal"></a>signal</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Moves the longest-waiting thread, if one exists, from the</span></span><br><span class="line"><span class="comment"> * wait queue for this condition to the wait queue for the</span></span><br><span class="line"><span class="comment"> * owning lock.</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@throws</span> IllegalMonitorStateException if {<span class="doctag">@link</span> #isHeldExclusively}</span></span><br><span class="line"><span class="comment"> * returns {<span class="doctag">@code</span> false}</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">final</span> <span class="keyword">void</span> <span class="title">signal</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">if</span> (!isHeldExclusively())</span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> IllegalMonitorStateException();</span><br><span class="line"> <span class="comment">// firstWaiter 肯定是最早开始等待的</span></span><br><span class="line"> Node first = firstWaiter;</span><br><span class="line"> <span class="comment">// 如果不为空就唤醒</span></span><br><span class="line"> <span class="keyword">if</span> (first != <span class="keyword">null</span>)</span><br><span class="line"> doSignal(first);</span><br><span class="line">}</span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Removes and transfers nodes until hit non-cancelled one or</span></span><br><span class="line"><span class="comment"> * null. Split out from signal in part to encourage compilers</span></span><br><span class="line"><span class="comment"> * to inline the case of no waiters.</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@param</span> first (non-null) the first node on condition queue</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="function"><span class="keyword">private</span> <span class="keyword">void</span> <span class="title">doSignal</span><span class="params">(Node first)</span> </span>{</span><br><span class="line"> <span class="keyword">do</span> {</span><br><span class="line"> <span class="comment">// 因为要去唤醒 first 节点了，firstWaiter 需要再从后面找一个</span></span><br><span class="line"> <span class="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><br><span class="line"> <span class="keyword">if</span> ( (firstWaiter = first.nextWaiter) == <span class="keyword">null</span>)</span><br><span class="line"> lastWaiter = <span class="keyword">null</span>;</span><br><span class="line"> <span class="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></span><br><span class="line"> first.nextWaiter = <span class="keyword">null</span>;</span><br><span class="line"> <span class="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><br><span class="line"> } <span class="keyword">while</span> (!transferForSignal(first) &&</span><br><span class="line"> (first = firstWaiter) != <span class="keyword">null</span>);</span><br><span class="line">}</span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Transfers a node from a condition queue onto sync queue.</span></span><br><span class="line"><span class="comment"> * Returns true if successful.</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@param</span> node the node</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@return</span> true if successfully transferred (else the node was</span></span><br><span class="line"><span class="comment"> * cancelled before signal)</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="function"><span class="keyword">final</span> <span class="keyword">boolean</span> <span class="title">transferForSignal</span><span class="params">(Node node)</span> </span>{</span><br><span class="line"> <span class="comment">/*</span></span><br><span class="line"><span class="comment"> * If cannot change waitStatus, the node has been cancelled.</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="comment">// 如果状态已经不是 CONDITION 就不会设置成功，返回 false</span></span><br><span class="line"> <span class="keyword">if</span> (!compareAndSetWaitStatus(node, Node.CONDITION, <span class="number">0</span>))</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line"> <span class="comment">/*</span></span><br><span class="line"><span class="comment"> * Splice onto queue and try to set waitStatus of predecessor to</span></span><br><span class="line"><span class="comment"> * indicate that thread is (probably) waiting. If cancelled or</span></span><br><span class="line"><span class="comment"> * attempt to set waitStatus fails, wake up to resync (in which</span></span><br><span class="line"><span class="comment"> * case the waitStatus can be transiently and harmlessly wrong).</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="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><br><span class="line"> Node p = enq(node);</span><br><span class="line"> <span class="keyword">int</span> ws = p.waitStatus;</span><br><span class="line"> <span class="comment">// 将前置节点状态设置成SIGNAL，表示后面有节点在等了</span></span><br><span class="line"> <span class="keyword">if</span> (ws > <span class="number">0</span> || !compareAndSetWaitStatus(p, ws, Node.SIGNAL))</span><br><span class="line"> LockSupport.unpark(node.thread);</span><br><span class="line"> <span class="comment">// 返回 true，上一个方法的循环就退出了</span></span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<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>
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<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>
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<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br><span class="line">114</span><br><span class="line">115</span><br><span class="line">116</span><br><span class="line">117</span><br><span class="line">118</span><br><span class="line">119</span><br><span class="line">120</span><br><span class="line">121</span><br><span class="line">122</span><br><span class="line">123</span><br><span class="line">124</span><br><span class="line">125</span><br><span class="line">126</span><br><span class="line">127</span><br><span class="line">128</span><br><span class="line">129</span><br><span class="line">130</span><br><span class="line">131</span><br><span class="line">132</span><br><span class="line">133</span><br><span class="line">134</span><br><span class="line">135</span><br><span class="line">136</span><br><span class="line">137</span><br><span class="line">138</span><br><span class="line">139</span><br><span class="line">140</span><br><span class="line">141</span><br><span class="line">142</span><br><span class="line">143</span><br><span class="line">144</span><br><span class="line">145</span><br><span class="line">146</span><br><span class="line">147</span><br><span class="line">148</span><br><span class="line">149</span><br><span class="line">150</span><br><span class="line">151</span><br><span class="line">152</span><br><span class="line">153</span><br><span class="line">154</span><br><span class="line">155</span><br><span class="line">156</span><br><span class="line">157</span><br><span class="line">158</span><br><span class="line">159</span><br><span class="line">160</span><br><span class="line">161</span><br><span class="line">162</span><br><span class="line">163</span><br><span class="line">164</span><br><span class="line">165</span><br><span class="line">166</span><br><span class="line">167</span><br><span class="line">168</span><br><span class="line">169</span><br><span class="line">170</span><br><span class="line">171</span><br><span class="line">172</span><br><span class="line">173</span><br><span class="line">174</span><br><span class="line">175</span><br><span class="line">176</span><br><span class="line">177</span><br><span class="line">178</span><br><span class="line">179</span><br><span class="line">180</span><br><span class="line">181</span><br><span class="line">182</span><br><span class="line">183</span><br><span class="line">184</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/*</span></span><br><span class="line"><span class="comment"> File: BoundedBuffer.java</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment"> Originally written by Doug Lea and released into the public domain.</span></span><br><span class="line"><span class="comment"> This may be used for any purposes whatsoever without acknowledgment.</span></span><br><span class="line"><span class="comment"> Thanks for the assistance and support of Sun Microsystems Labs,</span></span><br><span class="line"><span class="comment"> and everyone contributing, testing, and using this code.</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment"> History:</span></span><br><span class="line"><span class="comment"> Date Who What</span></span><br><span class="line"><span class="comment"> 11Jun1998 dl Create public version</span></span><br><span class="line"><span class="comment"> 17Jul1998 dl Simplified by eliminating wait counts</span></span><br><span class="line"><span class="comment"> 25aug1998 dl added peek</span></span><br><span class="line"><span class="comment"> 5May1999 dl replace % with conditional (slightly faster)</span></span><br><span class="line"><span class="comment">*/</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">package</span> EDU.oswego.cs.dl.util.concurrent;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Efficient array-based bounded buffer class.</span></span><br><span class="line"><span class="comment"> * Adapted from CPJ, chapter 8, which describes design.</span></span><br><span class="line"><span class="comment"> * <p>[<a href="http://gee.cs.oswego.edu/dl/classes/EDU/oswego/cs/dl/util/concurrent/intro.html"> Introduction to this package. </a>] <p></span></span><br><span class="line"><span class="comment"> **/</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">BoundedBuffer</span> <span class="keyword">implements</span> <span class="title">BoundedChannel</span> </span>{</span><br><span class="line"></span><br><span class="line"> <span class="keyword">protected</span> <span class="keyword">final</span> Object[] array_; <span class="comment">// the elements</span></span><br><span class="line"></span><br><span class="line"> <span class="keyword">protected</span> <span class="keyword">int</span> takePtr_ = <span class="number">0</span>; <span class="comment">// circular indices</span></span><br><span class="line"> <span class="keyword">protected</span> <span class="keyword">int</span> putPtr_ = <span class="number">0</span>; </span><br><span class="line"></span><br><span class="line"> <span class="keyword">protected</span> <span class="keyword">int</span> usedSlots_ = <span class="number">0</span>; <span class="comment">// length</span></span><br><span class="line"> <span class="keyword">protected</span> <span class="keyword">int</span> emptySlots_; <span class="comment">// capacity - length</span></span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Helper monitor to handle puts. </span></span><br><span class="line"><span class="comment"> **/</span></span><br><span class="line"> <span class="keyword">protected</span> <span class="keyword">final</span> Object putMonitor_ = <span class="keyword">new</span> Object();</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Create a BoundedBuffer with the given capacity.</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@exception</span> IllegalArgumentException if capacity less or equal to zero</span></span><br><span class="line"><span class="comment"> **/</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="title">BoundedBuffer</span><span class="params">(<span class="keyword">int</span> capacity)</span> <span class="keyword">throws</span> IllegalArgumentException </span>{</span><br><span class="line"> <span class="keyword">if</span> (capacity <= <span class="number">0</span>) <span class="keyword">throw</span> <span class="keyword">new</span> IllegalArgumentException();</span><br><span class="line"> array_ = <span class="keyword">new</span> Object[capacity];</span><br><span class="line"> emptySlots_ = capacity;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Create a buffer with the current default capacity</span></span><br><span class="line"><span class="comment"> **/</span></span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="title">BoundedBuffer</span><span class="params">()</span> </span>{ </span><br><span class="line"> <span class="keyword">this</span>(DefaultChannelCapacity.get()); </span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/** </span></span><br><span class="line"><span class="comment"> * Return the number of elements in the buffer.</span></span><br><span class="line"><span class="comment"> * This is only a snapshot value, that may change</span></span><br><span class="line"><span class="comment"> * immediately after returning.</span></span><br><span class="line"><span class="comment"> **/</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">synchronized</span> <span class="keyword">int</span> <span class="title">size</span><span class="params">()</span> </span>{ <span class="keyword">return</span> usedSlots_; }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">int</span> <span class="title">capacity</span><span class="params">()</span> </span>{ <span class="keyword">return</span> array_.length; }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">protected</span> <span class="keyword">void</span> <span class="title">incEmptySlots</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">synchronized</span>(putMonitor_) {</span><br><span class="line"> ++emptySlots_;</span><br><span class="line"> putMonitor_.notify();</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">protected</span> <span class="keyword">synchronized</span> <span class="keyword">void</span> <span class="title">incUsedSlots</span><span class="params">()</span> </span>{</span><br><span class="line"> ++usedSlots_;</span><br><span class="line"> notify();</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">protected</span> <span class="keyword">final</span> <span class="keyword">void</span> <span class="title">insert</span><span class="params">(Object x)</span> </span>{ <span class="comment">// mechanics of put</span></span><br><span class="line"> --emptySlots_;</span><br><span class="line"> array_[putPtr_] = x;</span><br><span class="line"> <span class="keyword">if</span> (++putPtr_ >= array_.length) putPtr_ = <span class="number">0</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">protected</span> <span class="keyword">final</span> Object <span class="title">extract</span><span class="params">()</span> </span>{ <span class="comment">// mechanics of take</span></span><br><span class="line"> --usedSlots_;</span><br><span class="line"> Object old = array_[takePtr_];</span><br><span class="line"> array_[takePtr_] = <span class="keyword">null</span>;</span><br><span class="line"> <span class="keyword">if</span> (++takePtr_ >= array_.length) takePtr_ = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">return</span> old;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> Object <span class="title">peek</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">synchronized</span>(<span class="keyword">this</span>) {</span><br><span class="line"> <span class="keyword">if</span> (usedSlots_ > <span class="number">0</span>)</span><br><span class="line"> <span class="keyword">return</span> array_[takePtr_];</span><br><span class="line"> <span class="keyword">else</span></span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">null</span>;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">put</span><span class="params">(Object x)</span> <span class="keyword">throws</span> InterruptedException </span>{</span><br><span class="line"> <span class="keyword">if</span> (x == <span class="keyword">null</span>) <span class="keyword">throw</span> <span class="keyword">new</span> IllegalArgumentException();</span><br><span class="line"> <span class="keyword">if</span> (Thread.interrupted()) <span class="keyword">throw</span> <span class="keyword">new</span> InterruptedException();</span><br><span class="line"></span><br><span class="line"> <span class="keyword">synchronized</span>(putMonitor_) {</span><br><span class="line"> <span class="keyword">while</span> (emptySlots_ <= <span class="number">0</span>) {</span><br><span class="line"> <span class="keyword">try</span> { putMonitor_.wait(); }</span><br><span class="line"> <span class="keyword">catch</span> (InterruptedException ex) {</span><br><span class="line"> putMonitor_.notify();</span><br><span class="line"> <span class="keyword">throw</span> ex;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> insert(x);</span><br><span class="line"> }</span><br><span class="line"> incUsedSlots();</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">offer</span><span class="params">(Object x, <span class="keyword">long</span> msecs)</span> <span class="keyword">throws</span> InterruptedException </span>{</span><br><span class="line"> <span class="keyword">if</span> (x == <span class="keyword">null</span>) <span class="keyword">throw</span> <span class="keyword">new</span> IllegalArgumentException();</span><br><span class="line"> <span class="keyword">if</span> (Thread.interrupted()) <span class="keyword">throw</span> <span class="keyword">new</span> InterruptedException();</span><br><span class="line"></span><br><span class="line"> <span class="keyword">synchronized</span>(putMonitor_) {</span><br><span class="line"> <span class="keyword">long</span> start = (msecs <= <span class="number">0</span>)? <span class="number">0</span> : System.currentTimeMillis();</span><br><span class="line"> <span class="keyword">long</span> waitTime = msecs;</span><br><span class="line"> <span class="keyword">while</span> (emptySlots_ <= <span class="number">0</span>) {</span><br><span class="line"> <span class="keyword">if</span> (waitTime <= <span class="number">0</span>) <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line"> <span class="keyword">try</span> { putMonitor_.wait(waitTime); }</span><br><span class="line"> <span class="keyword">catch</span> (InterruptedException ex) {</span><br><span class="line"> putMonitor_.notify();</span><br><span class="line"> <span class="keyword">throw</span> ex;</span><br><span class="line"> }</span><br><span class="line"> waitTime = msecs - (System.currentTimeMillis() - start);</span><br><span class="line"> }</span><br><span class="line"> insert(x);</span><br><span class="line"> }</span><br><span class="line"> incUsedSlots();</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> Object <span class="title">take</span><span class="params">()</span> <span class="keyword">throws</span> InterruptedException </span>{ </span><br><span class="line"> <span class="keyword">if</span> (Thread.interrupted()) <span class="keyword">throw</span> <span class="keyword">new</span> InterruptedException();</span><br><span class="line"> Object old = <span class="keyword">null</span>; </span><br><span class="line"> <span class="keyword">synchronized</span>(<span class="keyword">this</span>) { </span><br><span class="line"> <span class="keyword">while</span> (usedSlots_ <= <span class="number">0</span>) {</span><br><span class="line"> <span class="keyword">try</span> { wait(); }</span><br><span class="line"> <span class="keyword">catch</span> (InterruptedException ex) {</span><br><span class="line"> notify();</span><br><span class="line"> <span class="keyword">throw</span> ex; </span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> old = extract();</span><br><span class="line"> }</span><br><span class="line"> incEmptySlots();</span><br><span class="line"> <span class="keyword">return</span> old;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> Object <span class="title">poll</span><span class="params">(<span class="keyword">long</span> msecs)</span> <span class="keyword">throws</span> InterruptedException </span>{ </span><br><span class="line"> <span class="keyword">if</span> (Thread.interrupted()) <span class="keyword">throw</span> <span class="keyword">new</span> InterruptedException();</span><br><span class="line"> Object old = <span class="keyword">null</span>; </span><br><span class="line"> <span class="keyword">synchronized</span>(<span class="keyword">this</span>) { </span><br><span class="line"> <span class="keyword">long</span> start = (msecs <= <span class="number">0</span>)? <span class="number">0</span> : System.currentTimeMillis();</span><br><span class="line"> <span class="keyword">long</span> waitTime = msecs;</span><br><span class="line"> </span><br><span class="line"> <span class="keyword">while</span> (usedSlots_ <= <span class="number">0</span>) {</span><br><span class="line"> <span class="keyword">if</span> (waitTime <= <span class="number">0</span>) <span class="keyword">return</span> <span class="keyword">null</span>;</span><br><span class="line"> <span class="keyword">try</span> { wait(waitTime); }</span><br><span class="line"> <span class="keyword">catch</span> (InterruptedException ex) {</span><br><span class="line"> notify();</span><br><span class="line"> <span class="keyword">throw</span> ex; </span><br><span class="line"> }</span><br><span class="line"> waitTime = msecs - (System.currentTimeMillis() - start);</span><br><span class="line"></span><br><span class="line"> }</span><br><span class="line"> old = extract();</span><br><span class="line"> }</span><br><span class="line"> incEmptySlots();</span><br><span class="line"> <span class="keyword">return</span> old;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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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 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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%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%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%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%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%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%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">1</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%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%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">1</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%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%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">1</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/" rel="tag">最小栈</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%9D%80%E4%BA%BA%E8%AF%9B%E5%BF%83/" rel="tag">杀人诛心</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%9D%AD%E5%B7%9E/" rel="tag">杭州</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%A0%87%E8%AE%B0%E6%95%B4%E7%90%86/" rel="tag">标记整理</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%A4%8D%E7%89%A9%E5%9B%AD/" rel="tag">植物园</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%B2%99%E8%8C%B6%E9%9D%A2/" rel="tag">沙茶面</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%B3%A8%E8%A7%A3/" rel="tag">注解</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%B5%B7%E8%9B%8E%E7%85%8E/" rel="tag">海蛎煎</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%B6%88%E6%81%AF%E9%98%9F%E5%88%97/" rel="tag">消息队列</a><span class="tag-list-count">4</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%BA%90%E7%A0%81/" rel="tag">源码</a><span class="tag-list-count">11</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E6%BA%90%E7%A0%81%E8%A7%A3%E6%9E%90/" rel="tag">源码解析</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E7%94%9F%E6%B4%BB/" rel="tag">生活</a><span class="tag-list-count">16</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E7%96%AB%E6%83%85/" rel="tag">疫情</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E7%B3%9F%E5%BF%83%E4%BA%8B/" rel="tag">糟心事</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E7%B4%A2%E5%BC%95/" rel="tag">索引</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E7%BA%BF%E7%A8%8B%E6%B1%A0/" rel="tag">线程池</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E7%BC%93%E5%AD%98/" rel="tag">缓存</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E7%BC%93%E5%AD%98%E5%87%BB%E7%A9%BF/" rel="tag">缓存击穿</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E7%BC%93%E5%AD%98%E7%A9%BF%E9%80%8F/" rel="tag">缓存穿透</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E7%BC%93%E5%AD%98%E9%9B%AA%E5%B4%A9/" rel="tag">缓存雪崩</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E7%BE%8E%E5%9B%BD/" rel="tag">美国</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E8%87%AA%E9%80%82%E5%BA%94%E6%8B%93%E5%B1%95/" rel="tag">自适应拓展</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E8%A7%84%E5%88%99/" rel="tag">规则</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E8%AE%BE%E8%AE%A1%E6%A8%A1%E5%BC%8F/" rel="tag">设计模式</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E8%AF%BB%E4%B9%A6/" rel="tag">读书</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E8%AF%BB%E5%90%8E%E6%84%9F/" rel="tag">读后感</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E8%B6%B3%E7%90%83/" rel="tag">足球</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E8%B7%91%E6%AD%A5/" rel="tag">跑步</a><span class="tag-list-count">6</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E8%B7%AF%E6%94%BF%E8%A7%84%E5%88%92/" rel="tag">路政规划</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E8%BD%AC%E4%B9%89/" rel="tag">转义</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E8%BF%90%E5%8A%A8/" rel="tag">运动</a><span class="tag-list-count">6</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E9%80%92%E5%BD%92/" rel="tag">递归</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E9%A2%98%E8%A7%A3/" rel="tag">题解</a><span class="tag-list-count">9</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E9%A9%AC%E6%88%8F%E5%9B%A2/" rel="tag">马戏团</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E9%AB%98%E9%80%9F/" rel="tag">高速</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E9%BC%93%E6%B5%AA%E5%B1%BF/" rel="tag">鼓浪屿</a><span class="tag-list-count">1</span></li></ul>
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</canvas>
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</div>
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</div>
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<div class="links-of-blogroll motion-element">
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<div class="links-of-blogroll-title"><i class="fa fa-link fa-fw"></i>
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Links
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<ul class="links-of-blogroll-list">
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<li class="links-of-blogroll-item">
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<a href="https://covermusic.cn/" title="https://covermusic.cn" rel="noopener" target="_blank">69伙伴</a>
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</li>
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</div>
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</aside>
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<div id="sidebar-dimmer"></div>
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</div>
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</main>
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<footer class="footer">
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<div class="footer-inner">
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<div class="copyright">
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©
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<span itemprop="copyrightYear">2021</span>
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<span class="with-love">
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<i class="fa fa-heart"></i>
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<span class="author" itemprop="copyrightHolder">Nicksxs</span>
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</div>
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<div class="powered-by">Powered by <a href="https://hexo.io/" class="theme-link" rel="noopener" target="_blank">Hexo</a> & <a href="https://pisces.theme-next.org/" class="theme-link" rel="noopener" target="_blank">NexT.Pisces</a>
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<div class="busuanzi-count">
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<script async src="https://busuanzi.ibruce.info/busuanzi/2.3/busuanzi.pure.mini.js"></script>
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<span class="post-meta-item" id="busuanzi_container_site_uv" style="display: none;">
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<span class="post-meta-item-icon">
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<i class="fa fa-user"></i>
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</span>
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<span class="site-uv" title="Total Visitors">
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<span id="busuanzi_value_site_uv"></span>
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</span>
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</span>
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<span class="post-meta-divider">|</span>
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<span class="post-meta-item" id="busuanzi_container_site_pv" style="display: none;">
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<span class="post-meta-item-icon">
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<i class="fa fa-eye"></i>
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</span>
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<span class="site-pv" title="Total Views">
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<span id="busuanzi_value_site_pv"></span>
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</span>
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</div>
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<script>
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(function() {
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function leancloudSelector(url) {
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url = encodeURI(url);
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return document.getElementById(url).querySelector('.leancloud-visitors-count');
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}
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function addCount(Counter) {
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var visitors = document.querySelector('.leancloud_visitors');
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var url = decodeURI(visitors.id);
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var title = visitors.dataset.flagTitle;
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Counter('get', '/classes/Counter?where=' + encodeURIComponent(JSON.stringify({ url })))
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.then(response => response.json())
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.then(({ results }) => {
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if (results.length > 0) {
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var counter = results[0];
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leancloudSelector(url).innerText = counter.time + 1;
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Counter('put', '/classes/Counter/' + counter.objectId, { time: { '__op': 'Increment', 'amount': 1 } })
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.catch(error => {
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console.error('Failed to save visitor count', error);
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});
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} else {
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leancloudSelector(url).innerText = 'Counter not initialized! More info at console err msg.';
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console.error('ATTENTION! LeanCloud counter has security bug, see how to solve it here: https://github.com/theme-next/hexo-leancloud-counter-security. \n However, you can still use LeanCloud without security, by setting `security` option to `false`.');
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}
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})
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.catch(error => {
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console.error('LeanCloud Counter Error', error);
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});
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}
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|
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function showTime(Counter) {
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var visitors = document.querySelectorAll('.leancloud_visitors');
|
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var entries = [...visitors].map(element => {
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return decodeURI(element.id);
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});
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Counter('get', '/classes/Counter?where=' + encodeURIComponent(JSON.stringify({ url: { '$in': entries } })))
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.then(response => response.json())
|
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.then(({ results }) => {
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for (let url of entries) {
|
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let target = results.find(item => item.url === url);
|
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leancloudSelector(url).innerText = target ? target.time : 0;
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}
|
|
})
|
|
.catch(error => {
|
|
console.error('LeanCloud Counter Error', error);
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});
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}
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let { app_id, app_key, server_url } = {"enable":true,"app_id":"ysza182Vghlqjdt7QiwGLLJy-gzGzoHsz","app_key":"s9GDqbn7gnGGkusf66YRVccw","server_url":"https://leancloud.cn","security":true};
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function fetchData(api_server) {
|
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var Counter = (method, url, data) => {
|
|
return fetch(`${api_server}/1.1${url}`, {
|
|
method,
|
|
headers: {
|
|
'X-LC-Id' : app_id,
|
|
'X-LC-Key' : app_key,
|
|
'Content-Type': 'application/json',
|
|
},
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|
body: JSON.stringify(data)
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|
});
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};
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if (CONFIG.page.isPost) {
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if (CONFIG.hostname !== location.hostname) return;
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addCount(Counter);
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} else if (document.querySelectorAll('.post-title-link').length >= 1) {
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showTime(Counter);
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}
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}
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let api_server = app_id.slice(-9) !== '-MdYXbMMI' ? server_url : `https://${app_id.slice(0, 8).toLowerCase()}.api.lncldglobal.com`;
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if (api_server) {
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fetchData(api_server);
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} else {
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fetch('https://app-router.leancloud.cn/2/route?appId=' + app_id)
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|
.then(response => response.json())
|
|
.then(({ api_server }) => {
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fetchData('https://' + api_server);
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});
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}
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})();
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</script>
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</div>
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</footer>
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<script src="/lib/anime.min.js"></script>
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<script src="//cdn.jsdelivr.net/gh/fancyapps/fancybox@3/dist/jquery.fancybox.min.js"></script>
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<script src="/js/utils.js"></script>
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<script src="/js/motion.js"></script>
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<script>
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(function(){
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var canonicalURL, curProtocol;
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var x=document.getElementsByTagName("link");
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//Find the last canonical URL
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if(x.length > 0){
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for (i=0;i<x.length;i++){
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if(x[i].rel.toLowerCase() == 'canonical' && x[i].href){
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canonicalURL=x[i].href;
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}
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}
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}
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//Get protocol
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if (!canonicalURL){
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curProtocol = window.location.protocol.split(':')[0];
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