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這篇文章將為大家詳細(xì)講解有關(guān)java 中ThreadPoolExecutor的原理是什么，文章內(nèi)容質(zhì)量較高，因此小編分享給大家做個(gè)參考，希望大家閱讀完這篇文章后對(duì)相關(guān)知識(shí)有一定的了解。

java 中ThreadPoolExecutor原理分析

線程池簡(jiǎn)介

Java線程池是開(kāi)發(fā)中常用的工具，當(dāng)我們有異步、并行的任務(wù)要處理時(shí)，經(jīng)常會(huì)用到線程池，或者在實(shí)現(xiàn)一個(gè)服務(wù)器時(shí)，也需要使用線程池來(lái)接收連接處理請(qǐng)求。

線程池使用

JDK中提供的線程池實(shí)現(xiàn)位于java.util.concurrent.ThreadPoolExecutor。在使用時(shí)，通常使用ExecutorService接口，它提供了submit,invokeAll,shutdown等通用的方法。

在線程池配置方面，Executors類中提供了一些靜態(tài)方法能夠提供一些常用場(chǎng)景的線程池，如newFixedThreadPool,newCachedThreadPool,newSingleThreadExecutor等，這些方法最終都是調(diào)用到了ThreadPoolExecutor的構(gòu)造函數(shù)。

ThreadPoolExecutor的包含所有參數(shù)的構(gòu)造函數(shù)是

/**
   * @param corePoolSize the number of threads to keep in the pool, even
   *    if they are idle, unless {@code allowCoreThreadTimeOut} is set
   * @param maximumPoolSize the maximum number of threads to allow in the
   *    pool
   * @param keepAliveTime when the number of threads is greater than
   *    the core, this is the maximum time that excess idle threads
   *    will wait for new tasks before terminating.
   * @param unit the time unit for the {@code keepAliveTime} argument
   * @param workQueue the queue to use for holding tasks before they are
   *    executed. This queue will hold only the {@code Runnable}
   *    tasks submitted by the {@code execute} method.
   * @param threadFactory the factory to use when the executor
   *    creates a new thread
   * @param handler the handler to use when execution is blocked
   *    because the thread bounds and queue capacities are reached
  public ThreadPoolExecutor(int corePoolSize,
               int maximumPoolSize,
               long keepAliveTime,
               TimeUnit unit,
               BlockingQueue workQueue,
               ThreadFactory threadFactory,
               RejectedExecutionHandler handler) {
    if (corePoolSize < 0 ||
      maximumPoolSize <= 0 ||
      maximumPoolSize < corePoolSize ||
      keepAliveTime < 0)
      throw new IllegalArgumentException();
    if (workQueue == null || threadFactory == null || handler == null)
      throw new NullPointerException();
    this.corePoolSize = corePoolSize;
    this.maximumPoolSize = maximumPoolSize;
    this.workQueue = workQueue;
    this.keepAliveTime = unit.toNanos(keepAliveTime);
    this.threadFactory = threadFactory;
    this.handler = handler;
  }

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轉(zhuǎn)載來(lái)源：http://weahome.cn/article/ddjoco.html