共同学习Java源代码-多线程与并发-ThreadPoolExecutor类(七)-优快云博客

本文解析了线程池中的两个关键方法：addWorkerFailed与processWorkerExit。addWorkerFailed方法用于处理worker添加失败的情况，通过ReentrantLock进行同步控制，并调整worker计数。processWorkerExit方法则用于处理worker退出的情况，包括更新已完成任务计数、调整worker数量，并根据配置决定是否添加新的worker。

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private void addWorkerFailed(Worker w) {
final ReentrantLock mainLock = this.mainLock;
mainLock.lock();
try {
if (w != null)
workers.remove(w);
decrementWorkerCount();
tryTerminate();
} finally {
mainLock.unlock();
}

}

这是添加worker失败的方法

用mainLock锁住

判断如果参数传进来的worker不为空 workers中删除参数worker

然后减少worker数目然后调用tryTerminate方法关闭空闲的worker

最后mainLock解锁

private void processWorkerExit(Worker w, boolean completedAbruptly) {
if (completedAbruptly) // If abrupt, then workerCount wasn't adjusted
decrementWorkerCount();
final ReentrantLock mainLock = this.mainLock;
mainLock.lock();
try {
completedTaskCount += w.completedTasks;
workers.remove(w);
} finally {
mainLock.unlock();
}
tryTerminate();
int c = ctl.get();
if (runStateLessThan(c, STOP)) {
if (!completedAbruptly) {
int min = allowCoreThreadTimeOut ? 0 : corePoolSize;
if (min == 0 && ! workQueue.isEmpty())
min = 1;
if (workerCountOf(c) >= min)
return; // replacement not needed
}
addWorker(null, false);
}
}