java.util.concurrent源码学习系列--Executor

Executor的系列类图如下：这一些了类或接口都是和任务提交和执行相关的。

 

• java.util.concurrent.AbstractExecutorService (implements java.util.concurrent.ExecutorService extends  java.util.concurrent.Executor)
  • java.util.concurrent.ThreadPoolExecutor
    • java.util.concurrent.ScheduledThreadPoolExecutor (implements java.util.concurrent.ScheduledExecutorService extends  java.util.concurrent.ExecutorService)
• java.util.concurrent.Executors

java.util.concurrent.Executor接口：

 /* @since 1.5
 * @author Doug Lea
 */
public interface Executor {

    /**
     * Executes the given command at some time in the future.  The command
     * may execute in a new thread, in a pooled thread, or in the calling
     * thread, at the discretion of the <tt>Executor</tt> implementation.
     *会在将来某个时刻去执行任务，也就是所谓的异步执行
     *
     * @param command the runnable task
     * @throws RejectedExecutionException if this task cannot be
     * accepted for execution.
     * @throws NullPointerException if command is null
     */
    void execute(Runnable command);
}

java.util.concurrent.ExecutorService接口，该接口定义的方法如下：

 这些方法一部分在AbstractExecutorService提供了默认的实现，一部分延迟到ThreadPoolExecutor里实现。

java.util.concurrent.AbstractExecutorService抽象类:

参考：AbstractExecutorService.submit

参考：AbstractExecutorService.invokeAll

参考：AbstractExecutorService.invokeAny

java.util.concurrent.ThreadPoolExecutor类：

参考：ThreadPoolExecutor.execute