我想为线程池中执行的线程设置超时.目前我有以下代码:
ExecutorService executor = Executors.newFixedThreadPool(8);
for(List l: partition) {
Runnable worker = new WorkerThread(l);
executor.execute(worker);
}
executor.shutdown();
while (!executor.isTerminated()) {
}
代码只是将大量对象拆分为子列表,并在单个线程中处理这些子列表.但这不是重点.
我想给线程池中的每个单线程一个超时.对于池中只有一个线程,我找到了以下解决方案:
Future> future = null;
for (List l : partition) {
Runnable worker = new WorkerThread(l);
future = executor.submit(worker);
}
try {
System.out.println("Started..");
System.out.println(future.get(3, TimeUnit.SECONDS));
System.out.println("Finished!");
} catch (TimeoutException e) {
System.out.println("Terminated!");
}
但这不适用于多个线程.也许我必须将每个线程放在List< Future>中.列出并遍历此列表并为每个未来对象设置超时?
有什么建议?
使用CountDownLatch后编辑:
CountDownLatch doneSignal = new CountDownLatch(partition.size());
List> tasks = new ArrayList>();
ExecutorService executor = Executors.newFixedThreadPool(8);
for (List l : partition) {
Runnable worker = new WorkerThread(l);
tasks.add(executor.submit(doneSignal, worker));
}
doneSignal.await(1, TimeUnit.SECONDS);
if (doneSignal.getCount() > 0) {
for (Future> fut : tasks) {
if (!fut.isDone()) {
System.out.println("Task " + fut + " has not finshed!");
//fut.cancel(true) Maybe we can interrupt a thread this way?!
}
}
}
到目前为止效果很好.
接下来的问题是如何中断超时的线程?我尝试fut.cancel(true)并在工作线程的一些关键循环中添加以下构造:
if(Thread.interrupted()) {
System.out.println("!!Thread -> " + Thread.currentThread().getName() + " INTERRUPTED!!");
return;
}
因此工作线程在超时后被“杀死”.这是一个好的解决方案吗?
此外:是否有可能获得在Future接口上超时的线程的名称?目前,我必须在Thread.interrupted()构造的if条件中打印出名称.
感谢帮助!
问候