Code Fragment-提供相对安全和相对粗暴的两种接口胜过单一的接口

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提供相对安全和相对粗暴的两种接口胜过单一的接口

类

java.util.concurrent.ThreadPoolExecutor

方法

• shutdown

  • 在终止前允许执行以前提交的任务。
  • code

    • /*** Initiates an orderly shutdown in which previously submitted* tasks are executed, but no new tasks will be accepted.* Invocation has no additional effect if already shut down.** <p>This method does not wait for previously submitted tasks to* complete execution.  Use {@link #awaitTermination awaitTermination}* to do that.** @throws SecurityException {@inheritDoc}
      */
      public void shutdown() {final ReentrantLock mainLock = this.mainLock;mainLock.lock();try {checkShutdownAccess();advanceRunState(SHUTDOWN);interruptIdleWorkers();onShutdown(); // hook for ScheduledThreadPoolExecutor} finally {mainLock.unlock();}tryTerminate();
      }

• shutdownNow
  • 阻止正在等待的任务启动，并试图停止正在执行的任务。（相对粗暴）
  • code

    • /*** Attempts to stop all actively executing tasks, halts the* processing of waiting tasks, and returns a list of the tasks* that were awaiting execution. These tasks are drained (removed)* from the task queue upon return from this method.** <p>This method does not wait for actively executing tasks to* terminate.  Use {@link #awaitTermination awaitTermination} to* do that.** <p>There are no guarantees beyond best-effort attempts to stop* processing actively executing tasks.  This implementation* cancels tasks via {@link Thread#interrupt}, so any task that* fails to respond to interrupts may never terminate.** @throws SecurityException {@inheritDoc}*/
      public List<Runnable> shutdownNow() {List<Runnable> tasks;final ReentrantLock mainLock = this.mainLock;mainLock.lock();try {checkShutdownAccess();advanceRunState(STOP);interruptWorkers();tasks = drainQueue();} finally {mainLock.unlock();}tryTerminate();return tasks;
      }

      
      
      

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