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w1520138768 发表于 2013-07-22 21:05

求解tomcat线程池源码

最近读tomcat源代码，其中线程池部分有一段完全看不懂，ThreadPoolExecutor.java源文件中的一个方法，不知道这个这个方法起什么作用，以及Context reload是什么意思，在什么情况下需要进行Context reload public void contextStopping() {
      this.lastContextStoppedTime.set(System.currentTimeMillis());

      // save the current pool parameters to restore them later
      int savedCorePoolSize = this.getCorePoolSize();
      TaskQueue taskQueue =
                getQueue() instanceof TaskQueue ? (TaskQueue) getQueue() : null;
      if (taskQueue != null) {
            // note by slaurent : quite oddly threadPoolExecutor.setCorePoolSize
            // checks that queue.remainingCapacity()==0. I did not understand
            // why, but to get the intended effect of waking up idle threads, I
            // temporarily fake this condition.
            taskQueue.setForcedRemainingCapacity(Integer.valueOf(0));
      }

      // setCorePoolSize(0) wakes idle threads
      this.setCorePoolSize(0);

      // wait a little so that idle threads wake and poll the queue again,
      // this time always with a timeout (queue.poll() instead of
      // queue.take())
      // even if we did not wait enough, TaskQueue.take() takes care of timing
      // out, so that we are sure that all threads of the pool are renewed in
      // a limited time, something like
      // (threadKeepAlive + longest request time)
      try {
            Thread.sleep(200L);
      } catch (InterruptedException e) {
            // yes, ignore
      }

      if (taskQueue != null) {
            // ok, restore the state of the queue and pool
            taskQueue.setForcedRemainingCapacity(null);
      }
      this.setCorePoolSize(savedCorePoolSize);
    }

w1520138768 发表于 2013-07-22 23:31

我自己顶一下:-L

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