java中ThreadPoolExecutor的原理是什么-创新互联
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java 中ThreadPoolExecutor原理分析
线程池简介
Java线程池是开发中常用的工具,当我们有异步、并行的任务要处理时,经常会用到线程池,或者在实现一个服务器时,也需要使用线程池来接收连接处理请求。
线程池使用
JDK中提供的线程池实现位于java.util.concurrent.ThreadPoolExecutor。在使用时,通常使用ExecutorService接口,它提供了submit,invokeAll,shutdown等通用的方法。
在线程池配置方面,Executors类中提供了一些静态方法能够提供一些常用场景的线程池,如newFixedThreadPool,newCachedThreadPool,newSingleThreadExecutor等,这些方法最终都是调用到了ThreadPoolExecutor的构造函数。
ThreadPoolExecutor的包含所有参数的构造函数是
/** * @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, BlockingQueueworkQueue, 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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