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hidden itemprop=post itemscope itemtype=http://schema.org/CreativeWork><meta content="Tomcat 系列篇六-介绍下 Lifecycle | Nicksxs's Blog" itemprop=name><meta content="Tomcat 中的很多组件都是继承了LifecycleBase这个抽象类的,包括之前讲过的 connector,server,service,context,host 这些组件都是,我们先来看下接口 主体是分为两部分,第一部分是定义状态时间,如 beforeinit 和 aft…" itemprop=description></span><header class=post-header><h1 itemprop="name headline" class=post-title>Tomcat 系列篇六-介绍下 Lifecycle</h1><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>发表于</span> <time itemprop="dateCreated datePublished" title="创建时间:2023-10-21 20:30:32" datetime=2023-10-21T20:30:32+08:00>2023-10-21</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>分类于</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/SpringBoot/ itemprop=url rel=index><span itemprop=name>SpringBoot</span></a> </span>, <span itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/Java/SpringBoot/Tomcat/ itemprop=url rel=index><span itemprop=name>Tomcat</span></a> </span></span><span class="post-meta-item cloudflare-page-counter" data-title="Tomcat 系列篇六-介绍下 Lifecycle" data-increment=true data-path=/2023/10/21/Tomcat-%E7%B3%BB%E5%88%97%E7%AF%87%E5%85%AD-%E4%BB%8B%E7%BB%8D%E4%B8%8B-Lifecycle/ title=阅读次数><span class=post-meta-item-icon><i class="far fa-eye"></i> </span><span class=post-meta-item-text>阅读次数:</span> <span class=cloudflare-page-counter-count></span></span></div><div class=post-description>Tomcat 中的很多组件都是继承了LifecycleBase这个抽象类的,包括之前讲过的 connector,server,service,context,host 这些组件都是,我们先来看下接口 主体是分为两部分,第一部分是定义状态时间,如 beforeinit 和 aft…</div></div></header><div class=post-body itemprop=articleBody><p>Tomcat 中的很多组件都是继承了LifecycleBase这个抽象类的,包括之前讲过的 connector,server,service,context,host 这些组件都是,我们先来看下接口<br>主体是分为两部分,第一部分是定义状态时间,如 before_init 和 after_init,跟事件监听器的几个方法,添加查询和移除,第二部分是生命周期的相关方法,初始化开始结束与销毁等方法<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></pre><td class=code><pre><span class=line><span class=keyword>public</span> <span class=keyword>interface</span> <span class="title class_">Lifecycle</span> {</span><br><span class=line></span><br><span class=line></span><br><span class=line> </span><br><span class=line> <span class=keyword>public</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>String</span> <span class=variable>BEFORE_INIT_EVENT</span> <span class=operator>=</span> <span class=string>"before_init"</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>String</span> <span class=variable>AFTER_INIT_EVENT</span> <span class=operator>=</span> <span class=string>"after_init"</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>String</span> <span class=variable>START_EVENT</span> <span class=operator>=</span> <span class=string>"start"</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>String</span> <span class=variable>BEFORE_START_EVENT</span> <span class=operator>=</span> <span class=string>"before_start"</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>String</span> <span class=variable>AFTER_START_EVENT</span> <span class=operator>=</span> <span class=string>"after_start"</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>String</span> <span class=variable>STOP_EVENT</span> <span class=operator>=</span> <span class=string>"stop"</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>String</span> <span class=variable>BEFORE_STOP_EVENT</span> <span class=operator>=</span> <span class=string>"before_stop"</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>String</span> <span class=variable>AFTER_STOP_EVENT</span> <span class=operator>=</span> <span class=string>"after_stop"</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>String</span> <span class=variable>AFTER_DESTROY_EVENT</span> <span class=operator>=</span> <span class=string>"after_destroy"</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>String</span> <span class=variable>BEFORE_DESTROY_EVENT</span> <span class=operator>=</span> <span class=string>"before_destroy"</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>String</span> <span class=variable>PERIODIC_EVENT</span> <span class=operator>=</span> <span class=string>"periodic"</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>String</span> <span class=variable>CONFIGURE_START_EVENT</span> <span class=operator>=</span> <span class=string>"configure_start"</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>String</span> <span class=variable>CONFIGURE_STOP_EVENT</span> <span class=operator>=</span> <span class=string>"configure_stop"</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">addLifecycleListener</span><span class=params>(LifecycleListener listener)</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> LifecycleListener[] findLifecycleListeners();</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">removeLifecycleListener</span><span class=params>(LifecycleListener listener)</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">init</span><span class=params>()</span> <span class=keyword>throws</span> LifecycleException;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">start</span><span class=params>()</span> <span class=keyword>throws</span> LifecycleException;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">stop</span><span class=params>()</span> <span class=keyword>throws</span> LifecycleException;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">destroy</span><span class=params>()</span> <span class=keyword>throws</span> LifecycleException;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> LifecycleState <span class="title function_">getState</span><span class=params>()</span>;</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> String <span class="title function_">getStateName</span><span class=params>()</span>;</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> * Marker interface used to indicate that the instance should only be used</span></span><br><span class=line><span class=comment> * once. Calling {<span class=doctag>@link</span> #stop()} on an instance that supports this interface</span></span><br><span class=line><span class=comment> * will automatically call {<span class=doctag>@link</span> #destroy()} after {<span class=doctag>@link</span> #stop()}</span></span><br><span class=line><span class=comment> * completes.</span></span><br><span class=line><span class=comment> */</span></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>interface</span> <span class="title class_">SingleUse</span> {</span><br><span class=line> }</span><br><span class=line>}</span><br></pre></table></figure><p>对应的就是 Lifecycle 的状态,可以在 LifecycleState 中看到,这个枚举有两个字段组成,available 表示该状态下这个对应的组件状态是否可用,另一个就是对应的事件,比如 INITIALIZING 这个 state 对应的 BEFORE_INIT_EVENT<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></pre><td class=code><pre><span class=line><span class=keyword>public</span> <span class=keyword>enum</span> <span class="title class_">LifecycleState</span> {</span><br><span class=line> NEW(<span class=literal>false</span>, <span class=literal>null</span>),</span><br><span class=line> INITIALIZING(<span class=literal>false</span>, Lifecycle.BEFORE_INIT_EVENT),</span><br><span class=line> INITIALIZED(<span class=literal>false</span>, Lifecycle.AFTER_INIT_EVENT),</span><br><span class=line> STARTING_PREP(<span class=literal>false</span>, Lifecycle.BEFORE_START_EVENT),</span><br><span class=line> STARTING(<span class=literal>true</span>, Lifecycle.START_EVENT),</span><br><span class=line> STARTED(<span class=literal>true</span>, Lifecycle.AFTER_START_EVENT),</span><br><span class=line> STOPPING_PREP(<span class=literal>true</span>, Lifecycle.BEFORE_STOP_EVENT),</span><br><span class=line> STOPPING(<span class=literal>false</span>, Lifecycle.STOP_EVENT),</span><br><span class=line> STOPPED(<span class=literal>false</span>, Lifecycle.AFTER_STOP_EVENT),</span><br><span class=line> DESTROYING(<span class=literal>false</span>, Lifecycle.BEFORE_DESTROY_EVENT),</span><br><span class=line> DESTROYED(<span class=literal>false</span>, Lifecycle.AFTER_DESTROY_EVENT),</span><br><span class=line> FAILED(<span class=literal>false</span>, <span class=literal>null</span>);</span><br><span class=line></span><br><span class=line> <span class=keyword>private</span> <span class=keyword>final</span> <span class=type>boolean</span> available;</span><br><span class=line> <span class=keyword>private</span> <span class=keyword>final</span> String lifecycleEvent;</span><br><span class=line></span><br><span class=line> <span class=keyword>private</span> <span class="title function_">LifecycleState</span><span class=params>(<span class=type>boolean</span> available, String lifecycleEvent)</span> {</span><br><span class=line> <span class=built_in>this</span>.available = available;</span><br><span class=line> <span class=built_in>this</span>.lifecycleEvent = lifecycleEvent;</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> * May the public methods other than property getters/setters and lifecycle</span></span><br><span class=line><span class=comment> * methods be called for a component in this state? It returns</span></span><br><span class=line><span class=comment> * <code>true</code> for any component in any of the following states:</span></span><br><span class=line><span class=comment> * <ul></span></span><br><span class=line><span class=comment> * <li>{<span class=doctag>@link</span> #STARTING}</li></span></span><br><span class=line><span class=comment> * <li>{<span class=doctag>@link</span> #STARTED}</li></span></span><br><span class=line><span class=comment> * <li>{<span class=doctag>@link</span> #STOPPING_PREP}</li></span></span><br><span class=line><span class=comment> * </ul></span></span><br><span class=line><span class=comment> *</span></span><br><span class=line><span class=comment> * <span class=doctag>@return</span> <code>true</code> if the component is available for use,</span></span><br><span class=line><span class=comment> * otherwise <code>false</code></span></span><br><span class=line><span class=comment> */</span></span><br><span class=line> <span class=keyword>public</span> <span class=type>boolean</span> <span class="title function_">isAvailable</span><span class=params>()</span> {</span><br><span class=line> <span class=keyword>return</span> available;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> String <span class="title function_">getLifecycleEvent</span><span class=params>()</span> {</span><br><span class=line> <span class=keyword>return</span> lifecycleEvent;</span><br><span class=line> }</span><br><span class=line>}</span><br></pre></table></figure><p>然后可以看看 Lifecycle 的状态流转示意,下面是从 Lifecycle 的代码注释里拷出来的<blockquote><p>Common interface for component life cycle methods. Catalina components may implement this interface (as well as the appropriate interface(s) for the functionality they support) in order to provide a consistent mechanism to start and stop the component. The valid state transitions for components that support Lifecycle are:</blockquote><figure class="highlight shell"><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></pre><td class=code><pre><span class=line> start()</span><br><span class=line> -----------------------------</span><br><span class=line> | |</span><br><span class=line> | init() |</span><br><span class=line>NEW -»-- INITIALIZING |</span><br><span class=line>| | | | ------------------«-----------------------</span><br><span class=line>| | |auto | | |</span><br><span class=line>| | \|/ start() \|/ \|/ auto auto stop() |</span><br><span class=line>| | INITIALIZED --»-- STARTING_PREP --»- STARTING --»- STARTED --»--- |</span><br><span class=line>| | | | |</span><br><span class=line>| |destroy()| | |</span><br><span class=line>| --»-----«-- ------------------------«-------------------------------- ^</span><br><span class=line>| | | |</span><br><span class=line>| | \|/ auto auto start() |</span><br><span class=line>| | STOPPING_PREP ----»---- STOPPING ------»----- STOPPED -----»-----</span><br><span class=line>| \|/ ^ | ^</span><br><span class=line>| | stop() | | |</span><br><span class=line>| | -------------------------- | |</span><br><span class=line>| | | | |</span><br><span class=line>| | | destroy() destroy() | |</span><br><span class=line>| | FAILED ----»------ DESTROYING ---«----------------- |</span><br><span class=line>| | ^ | |</span><br><span class=line>| | destroy() | |auto |</span><br><span class=line>| --------»----------------- \|/ |</span><br><span class=line>| DESTROYED |</span><br><span class=line>| |</span><br><span class=line>| stop() |</span><br><span class=line>----»-----------------------------»------------------------------</span><br></pre></table></figure><p>Any state can transition to FAILED.<p>Calling start() while a component is in states STARTING_PREP, STARTING or<br>STARTED has no effect.<p>Calling start() while a component is in state NEW will cause init() to be<br>called immediately after the start() method is entered.<p>Calling stop() while a component is in states STOPPING_PREP, STOPPING or<br>STOPPED has no effect.<p>Calling stop() while a component is in state NEW transitions the component<br>to STOPPED. This is typically encountered when a component fails to start and<br>does not start all its sub-components. When the component is stopped, it will<br>try to stop all sub-components - even those it didn’t start.<p>Attempting any other transition will throw LifecycleException.<p>The LifecycleEvents fired during state changes are defined in the methods that trigger the changed. No LifecycleEvents are fired if the attempted transition is not valid.<br>好的项目就是会把这样的示意图画得很好,把状态流转都画得很明确,而不一定要什么好看的作图工具,用字符就可以<br>而在 LifecycleBase类中是把更细节的实现了,<br>init方法就是先判断了状态<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></pre><td class=code><pre><span class=line><span class=meta>@Override</span></span><br><span class=line><span class=keyword>public</span> <span class=keyword>final</span> <span class=keyword>synchronized</span> <span class=keyword>void</span> <span class="title function_">init</span><span class=params>()</span> <span class=keyword>throws</span> LifecycleException {</span><br><span class=line> <span class=keyword>if</span> (!state.equals(LifecycleState.NEW)) {</span><br><span class=line> <span class=comment>// 只有状态是 new 才可以执行初始化 init</span></span><br><span class=line> invalidTransition(Lifecycle.BEFORE_INIT_EVENT);</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> setStateInternal(LifecycleState.INITIALIZING, <span class=literal>null</span>, <span class=literal>false</span>);</span><br><span class=line> initInternal();</span><br><span class=line> setStateInternal(LifecycleState.INITIALIZED, <span class=literal>null</span>, <span class=literal>false</span>);</span><br><span class=line> } <span class=keyword>catch</span> (Throwable t) {</span><br><span class=line> handleSubClassException(t, <span class=string>"lifecycleBase.initFail"</span>, toString());</span><br><span class=line> }</span><br><span class=line>}</span><br></pre></table></figure><p>在判断状态后就先设置了初始化中这个状态,这里设置的时候是 check 是 false 的,所以直接到设置状态,并且触发事件<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 class=code><pre><span class=line><span class=keyword>private</span> <span class=keyword>synchronized</span> <span class=keyword>void</span> <span class="title function_">setStateInternal</span><span class=params>(LifecycleState state, Object data, <span class=type>boolean</span> check)</span></span><br><span class=line> <span class=keyword>throws</span> LifecycleException {</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (log.isDebugEnabled()) {</span><br><span class=line> log.debug(sm.getString(<span class=string>"lifecycleBase.setState"</span>, <span class=built_in>this</span>, state));</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (check) {</span><br><span class=line> <span class=comment>// Must have been triggered by one of the abstract methods (assume</span></span><br><span class=line> <span class=comment>// code in this class is correct)</span></span><br><span class=line> <span class=comment>// null is never a valid state</span></span><br><span class=line> <span class=keyword>if</span> (state == <span class=literal>null</span>) {</span><br><span class=line> invalidTransition(<span class=string>"null"</span>);</span><br><span class=line> <span class=comment>// Unreachable code - here to stop eclipse complaining about</span></span><br><span class=line> <span class=comment>// a possible NPE further down the method</span></span><br><span class=line> <span class=keyword>return</span>;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>// Any method can transition to failed</span></span><br><span class=line> <span class=comment>// startInternal() permits STARTING_PREP to STARTING</span></span><br><span class=line> <span class=comment>// stopInternal() permits STOPPING_PREP to STOPPING and FAILED to</span></span><br><span class=line> <span class=comment>// STOPPING</span></span><br><span class=line> <span class=keyword>if</span> (!(state == LifecycleState.FAILED ||</span><br><span class=line> (<span class=built_in>this</span>.state == LifecycleState.STARTING_PREP &&</span><br><span class=line> state == LifecycleState.STARTING) ||</span><br><span class=line> (<span class=built_in>this</span>.state == LifecycleState.STOPPING_PREP &&</span><br><span class=line> state == LifecycleState.STOPPING) ||</span><br><span class=line> (<span class=built_in>this</span>.state == LifecycleState.FAILED &&</span><br><span class=line> state == LifecycleState.STOPPING))) {</span><br><span class=line> <span class=comment>// No other transition permitted</span></span><br><span class=line> invalidTransition(state.name());</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=built_in>this</span>.state = state;</span><br><span class=line> <span class=type>String</span> <span class=variable>lifecycleEvent</span> <span class=operator>=</span> state.getLifecycleEvent();</span><br><span class=line> <span class=keyword>if</span> (lifecycleEvent != <span class=literal>null</span>) {</span><br><span class=line> fireLifecycleEvent(lifecycleEvent, data);</span><br><span class=line> }</span><br><span class=line> }</span><br></pre></table></figure><p>触发事件调用了 fireLifecycleEvent<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 class=code><pre><span class=line><span class=keyword>protected</span> <span class=keyword>void</span> <span class="title function_">fireLifecycleEvent</span><span class=params>(String type, Object data)</span> {</span><br><span class=line> <span class=type>LifecycleEvent</span> <span class=variable>event</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">LifecycleEvent</span>(<span class=built_in>this</span>, type, data);</span><br><span class=line> <span class=keyword>for</span> (LifecycleListener listener : lifecycleListeners) {</span><br><span class=line> listener.lifecycleEvent(event);</span><br><span class=line> }</span><br><span class=line>}</span><br></pre></table></figure><p>会调用所有的 listener 将事件发送出去<br>而回到上面 init 方法,第二步的 initInternal 就是 Tomcat 的 Lifecycle 中非常核心的一点了<br>因为上面说到很多组件都是继承了 LifecycleBase 的,实际外部被调用的其实都是 LifecycleBase 的<br>init,start 等方法,内部是由这个抽象基类去设置前后的状态,以及调用 initInternal ,也就是具体<br>实现类的实现方法,譬如 connector 的 initInternal 方法,就是真正处理初始化逻辑的<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></pre><td class=code><pre><span class=line><span class=meta>@Override</span></span><br><span class=line><span class=keyword>protected</span> <span class=keyword>void</span> <span class="title function_">initInternal</span><span class=params>()</span> <span class=keyword>throws</span> LifecycleException {</span><br><span class=line></span><br><span class=line> <span class=built_in>super</span>.initInternal();</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (protocolHandler == <span class=literal>null</span>) {</span><br><span class=line> <span class=keyword>throw</span> <span class=keyword>new</span> <span class="title class_">LifecycleException</span>(</span><br><span class=line> sm.getString(<span class=string>"coyoteConnector.protocolHandlerInstantiationFailed"</span>));</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>// Initialize adapter</span></span><br><span class=line> adapter = <span class=keyword>new</span> <span class="title class_">CoyoteAdapter</span>(<span class=built_in>this</span>);</span><br><span class=line> protocolHandler.setAdapter(adapter);</span><br><span class=line> <span class=keyword>if</span> (service != <span class=literal>null</span>) {</span><br><span class=line> protocolHandler.setUtilityExecutor(service.getServer().getUtilityExecutor());</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>// Make sure parseBodyMethodsSet has a default</span></span><br><span class=line> <span class=keyword>if</span> (<span class=literal>null</span> == parseBodyMethodsSet) {</span><br><span class=line> setParseBodyMethods(getParseBodyMethods());</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (protocolHandler.isAprRequired() && !AprStatus.isInstanceCreated()) {</span><br><span class=line> <span class=keyword>throw</span> <span class=keyword>new</span> <span class="title class_">LifecycleException</span>(sm.getString(<span class=string>"coyoteConnector.protocolHandlerNoAprListener"</span>,</span><br><span class=line> getProtocolHandlerClassName()));</span><br><span class=line> }</span><br><span class=line> <span class=keyword>if</span> (protocolHandler.isAprRequired() && !AprStatus.isAprAvailable()) {</span><br><span class=line> <span class=keyword>throw</span> <span class=keyword>new</span> <span class="title class_">LifecycleException</span>(sm.getString(<span class=string>"coyoteConnector.protocolHandlerNoAprLibrary"</span>,</span><br><span class=line> getProtocolHandlerClassName()));</span><br><span class=line> }</span><br><span class=line> <span class=keyword>if</span> (AprStatus.isAprAvailable() && AprStatus.getUseOpenSSL() &&</span><br><span class=line> protocolHandler <span class=keyword>instanceof</span> AbstractHttp11JsseProtocol) {</span><br><span class=line> AbstractHttp11JsseProtocol<?> jsseProtocolHandler =</span><br><span class=line> (AbstractHttp11JsseProtocol<?>) protocolHandler;</span><br><span class=line> <span class=keyword>if</span> (jsseProtocolHandler.isSSLEnabled() &&</span><br><span class=line> jsseProtocolHandler.getSslImplementationName() == <span class=literal>null</span>) {</span><br><span class=line> <span class=comment>// OpenSSL is compatible with the JSSE configuration, so use it if APR is available</span></span><br><span class=line> jsseProtocolHandler.setSslImplementationName(OpenSSLImplementation.class.getName());</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> protocolHandler.init();</span><br><span class=line> } <span class=keyword>catch</span> (Exception e) {</span><br><span class=line> <span class=keyword>throw</span> <span class=keyword>new</span> <span class="title class_">LifecycleException</span>(</span><br><span class=line> sm.getString(<span class=string>"coyoteConnector.protocolHandlerInitializationFailed"</span>), e);</span><br><span class=line> }</span><br><span class=line>}</span><br></pre></table></figure><p>start 方法也是类似的,但是更复杂,第一步也是状态判断,是不是已经被启动过了,如果还是 new 状态的话就先调用 init,如果已经 failed 启动失败了就直接调用 stop 结束了,如果是非已初始化和非已停止的状态则是错误的状态转变<br>如果是正常情况,那就是先设置成 STARTING_PREP,然后调用实现类的 startInternal,如果启动失败了就调用 stop,此时理论上应该是启动中 STARTING 状态,否则就是异常状态转变,剩下的就是状态启动完的状态,<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></pre><td class=code><pre><span class=line><span class=meta>@Override</span></span><br><span class=line><span class=keyword>public</span> <span class=keyword>final</span> <span class=keyword>synchronized</span> <span class=keyword>void</span> <span class="title function_">start</span><span class=params>()</span> <span class=keyword>throws</span> LifecycleException {</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (LifecycleState.STARTING_PREP.equals(state) || LifecycleState.STARTING.equals(state) ||</span><br><span class=line> LifecycleState.STARTED.equals(state)) {</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (log.isDebugEnabled()) {</span><br><span class=line> <span class=type>Exception</span> <span class=variable>e</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">LifecycleException</span>();</span><br><span class=line> log.debug(sm.getString(<span class=string>"lifecycleBase.alreadyStarted"</span>, toString()), e);</span><br><span class=line> } <span class=keyword>else</span> <span class=keyword>if</span> (log.isInfoEnabled()) {</span><br><span class=line> log.info(sm.getString(<span class=string>"lifecycleBase.alreadyStarted"</span>, toString()));</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>return</span>;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (state.equals(LifecycleState.NEW)) {</span><br><span class=line> init();</span><br><span class=line> } <span class=keyword>else</span> <span class=keyword>if</span> (state.equals(LifecycleState.FAILED)) {</span><br><span class=line> stop();</span><br><span class=line> } <span class=keyword>else</span> <span class=keyword>if</span> (!state.equals(LifecycleState.INITIALIZED) &&</span><br><span class=line> !state.equals(LifecycleState.STOPPED)) {</span><br><span class=line> invalidTransition(Lifecycle.BEFORE_START_EVENT);</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> setStateInternal(LifecycleState.STARTING_PREP, <span class=literal>null</span>, <span class=literal>false</span>);</span><br><span class=line> startInternal();</span><br><span class=line> <span class=keyword>if</span> (state.equals(LifecycleState.FAILED)) {</span><br><span class=line> <span class=comment>// This is a 'controlled' failure. The component put itself into the</span></span><br><span class=line> <span class=comment>// FAILED state so call stop() to complete the clean-up.</span></span><br><span class=line> stop();</span><br><span class=line> } <span class=keyword>else</span> <span class=keyword>if</span> (!state.equals(LifecycleState.STARTING)) {</span><br><span class=line> <span class=comment>// Shouldn't be necessary but acts as a check that sub-classes are</span></span><br><span class=line> <span class=comment>// doing what they are supposed to.</span></span><br><span class=line> invalidTransition(Lifecycle.AFTER_START_EVENT);</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> setStateInternal(LifecycleState.STARTED, <span class=literal>null</span>, <span class=literal>false</span>);</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>catch</span> (Throwable t) {</span><br><span class=line> <span class=comment>// This is an 'uncontrolled' failure so put the component into the</span></span><br><span class=line> <span class=comment>// FAILED state and throw an exception.</span></span><br><span class=line> handleSubClassException(t, <span class=string>"lifecycleBase.startFail"</span>, toString());</span><br><span class=line> }</span><br><span class=line>}</span><br></pre></table></figure><p>stop 跟 destroy 也类似的</div><footer class=post-footer><div class="affiliate-creative affiliate-creative--post-end" data-affiliate-id=tencent-cloud-general><a rel="sponsored noopener" aria-label=腾讯云产品优惠 href=https://cloud.tencent.com/act/cps/redirect?redirect=2446&cps_key=2e33a1eedb380997d03618b4a5ba6ca7&from=console target=_blank><img alt=腾讯云服务器、数据库和云产品优惠 decoding=async height=419 loading=lazy src=/uploads/affiliate/tencent-cloud-general.webp width=690> </a><span class=affiliate-disclosure>推广</span></div><div class=reward-container><div>请我一杯咖啡吧!</div><button>赞赏</button><div class=post-reward><div><img alt="Nicksxs 微信" 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