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<meta name='description' content='这篇文章将为大家详细讲解有关ThreadPoolExecutor该如何解析，文章内容质量较高，因此小编分享给大家做个参考，希望大家阅读完这篇文章后对相关知识有一定的了解。 线程池类为 java.util.concurrent.ThreadPoolExec…' />
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                            <h1 class="entry-title">ThreadPoolExecutor该如何解析</h1>
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                                                                <time class="entry-date published" datetime="2022-01-06T18:26:33+08:00" pubdate>
                                    2022年1月6日 18:26                                </time>
                                <span class="dot">•</span>
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                            <p class="introduction">这篇文章将为大家详细讲解有关ThreadPoolExecutor该如何解析，文章内容质量较高，因此小编分享给大家做个参考，希望大家阅读完这篇文章后对相关知识有一定的了解。</p>
<p>线程池类为 java.util.concurrent.ThreadPoolExecutor，常用构造方法为：</p>
<p>ThreadPoolExecutor(intcorePoolSize, int maximumPoolSize,</p>
<p>longkeepAliveTime, &nbsp;TimeUnit unit, &nbsp;BlockingQueue&lt;Runnable&gt;workQueue,&nbsp;</p>
<p>RejectedExecutionHandlerhandler)</p>
<p>corePoolSize：线程池维护线程的最少数量</p>
<p>maximumPoolSize：线程池维护线程的最大数量</p>
<p>keepAliveTime：线程池维护线程所允许的空闲时间</p>
<p>unit：线程池维护线程所允许的空闲时间的单位</p>
<p>workQueue：线程池所使用的缓冲队列</p>
<p>handler：线程池对拒绝任务的处理策略</p>
<p>一个任务通过 execute(Runnable)方法被添加到线程池，任务就是一个 Runnable类型的对象，任务的执行方法就是 Runnable类型对象的run()方法。</p>
<p>当一个任务通过execute(Runnable)方法欲添加到线程池时：</p>
<p>1、如果此时线程池中的数量小于corePoolSize，即使线程池中的线程都处于空闲状态，也要创建新的线程来处理被添加的任务。</p>
<p>2、如果此时线程池中的数量等于 corePoolSize，但是缓冲队列workQueue未满，那么任务被放入缓冲队列。</p>
<p>3、如果此时线程池中的数量大于corePoolSize，缓冲队列workQueue满，并且线程池中的数量小于maximumPoolSize，建新的线程来处理被添加的任务。</p>
<p>4、如果此时线程池中的数量大于corePoolSize，缓冲队列workQueue满，并且线程池中的数量等于maximumPoolSize，那么通过handler所指定的策略来处理此任务。</p>
<p>处理任务的优先级为：</p>
<p>核心线程corePoolSize、任务队列workQueue、最大线程maximumPoolSize，如果三者都满了，使用handler处理被拒绝的任务。</p>
<p>当线程池中的线程数量大于 corePoolSize时，如果某线程空闲时间超过keepAliveTime，线程将被终止。这样线程池可以动态的调整池中的线程数。</p>
<p>unit可选的参数为java.util.concurrent.TimeUnit中的几个静态属性：</p>
<p>&nbsp;&nbsp;&nbsp;&nbsp;NANOSECONDS</p>
<p>&nbsp;&nbsp;&nbsp;&nbsp;MICROSECONDS</p>
<p>&nbsp;&nbsp;&nbsp;&nbsp;MILLISECONDS</p>
<p>&nbsp;&nbsp;&nbsp;&nbsp;SECONDS</p>
<p>workQueue我常用的是：java.util.concurrent.ArrayBlockingQueue</p>
<p>handler有四个选择：</p>
<p>1、ThreadPoolExecutor.AbortPolicy()</p>
<p>&nbsp; 抛出java.util.concurrent.RejectedExecutionException异常</p>
<p>2、ThreadPoolExecutor.CallerRunsPolicy()</p>
<p>&nbsp; 重试添加当前的任务，他会自动重复调用execute()方法</p>
<p>3、ThreadPoolExecutor.DiscardOldestPolicy()</p>
<p>&nbsp; 抛弃旧的任务</p>
<p>4、ThreadPoolExecutor.DiscardPolicy()</p>
<p>&nbsp; 抛弃当前的任务</p>
<p>例子：</p>
<p>import java.util.concurrent.ArrayBlockingQueue;</p>
<p>import java.util.concurrent.ThreadPoolExecutor;</p>
<p>import java.util.concurrent.TimeUnit;</p>
<p>public class TestThreadPool {</p>
<p>private static int produceTaskSleepTime = 2;</p>
<p>private static int produceTaskMaxNumber = 10;</p>
<p>public static void main(String[] args) {</p>
<p>// 构造一个线程池</p>
<p>ThreadPoolExecutor threadPool = new ThreadPoolExecutor(2, 4, 3, TimeUnit.SECONDS,</p>
<p>new ArrayBlockingQueue&lt;Runnable&gt;(3), new ThreadPoolExecutor.DiscardOldestPolicy());</p>
<p>for (int i = 1; i &lt;= produceTaskMaxNumber; i++) {</p>
<p>try {</p>
<p>// 产生一个任务，并将其加入到线程池</p>
<p>String task = &quot;task@ &quot; + i;</p>
<p>System.out.println(&quot;put &quot; + task);</p>
<p>threadPool.execute(new ThreadPoolTask(task));</p>
<p>// 便于观察，等待一段时间</p>
<p>Thread.sleep(produceTaskSleepTime);</p>
<p>} catch (Exception e) {</p>
<p>e.printStackTrace();</p>
<p>}</p>
<p>}</p>
<p>}</p>
<p>}</p>
<p>/**</p>
<p>&nbsp;* 线程池执行的任务</p>
<p>&nbsp;*&nbsp;</p>
<p>&nbsp;*/</p>
<p>public class ThreadPoolTask implements Runnable, Serializable {</p>
<p>private static final long serialVersionUID = 0;</p>
<p>// 保存任务所需要的数据</p>
<p>private Object threadPoolTaskData;</p>
<p>ThreadPoolTask(Object tasks) {</p>
<p>this.threadPoolTaskData = tasks;</p>
<p>}</p>
<p>private static int consumeTaskSleepTime = 2000;</p>
<p>public void run() {</p>
<p>// 处理一个任务，这里的处理方式太简单了，仅仅是一个打印语句</p>
<p>System.out.println(&quot;start ..&quot; + threadPoolTaskData);</p>
<p>try {</p>
<p>//// 便于观察，等待一段时间</p>
<p>Thread.sleep(consumeTaskSleepTime);</p>
<p>} catch (Exception e) {</p>
<p>e.printStackTrace();</p>
<p>}</p>
<p>threadPoolTaskData = null;</p>
<p>}</p>
<p>public Object getTask() {</p>
<p>return this.threadPoolTaskData;</p>
<p>}</p>
<p>}</p>
<p>说明：</p>
<p>1、在这段程序中，一个任务就是一个Runnable类型的对象，也就是一个ThreadPoolTask类型的对象。</p>
<p>2、一般来说任务除了处理方式外，还需要处理的数据，处理的数据通过构造方法传给任务。</p>
<p>3、在这段程序中，main()方法相当于一个残忍的领导，他派发出许多任务，丢给一个叫 threadPool的任劳任怨的小组来做。</p>
<p>这个小组里面队员至少有两个，如果他们两个忙不过来，任务就被放到任务列表里面。</p>
<p>如果积压的任务过多，多到任务列表都装不下(超过3个)的时候，就雇佣新的队员来帮忙。但是基于成本的考虑，不能雇佣太多的队员，至多只能雇佣 4个。</p>
<p>如果四个队员都在忙时，再有新的任务，这个小组就处理不了了，任务就会被通过一种策略来处理，我们的处理方式是不停的派发，直到接受这个任务为止(更残忍！呵呵)。</p>
<p>因为队员工作是需要成本的，如果工作很闲，闲到 3 SECONDS都没有新的任务了，那么有的队员就会被解雇了，但是为了小组的正常运转，即使工作再闲，小组的队员也不能少于两个。</p>
<p>4、通过调整 produceTaskSleepTime和consumeTaskSleepTime的大小来实现对派发任务和处理任务的速度的控制，改变这两个值就可以观察不同速率下程序的工作情况。</p>
<p>5、通过调整4中所指的数据，再加上调整任务丢弃策略，换上其他三种策略，就可以看出不同策略下的不同处理方式。</p>
<p>6、对于其他的使用方法，参看jdk的帮助，很容易理解和使用。</p>
<p class="introduction">关于ThreadPoolExecutor该如何解析就分享到这里了，希望以上内容可以对大家有一定的帮助，可以学到更多知识。如果觉得文章不错，可以把它分享出去让更多的人看到。</p>
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