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标题:
求解tomcat线程池源码
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作者:
w1520138768
时间:
2013-07-22 21:05
标题:
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);
}
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作者:
w1520138768
时间:
2013-07-22 23:31
我自己顶一下
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