Java:如何按需唤醒线程? [英] Java: How to wake thread on demand?

问题描述

假设我想创建一个基本上无限运行线程的对象.我希望线程在不需要他的情况下进入睡眠状态，但是当需要完成某些工作时，它将唤醒线程-完成工作并返回睡眠状态.我还希望将作业排入队列并按它们到达的顺序执行.在可可/目标c中，有一个NSOperationQueue.我不知道Java是否有类似的东西.

Let's say I want to create an object that basically runs a thread infinitely. I want the thread to sleep while there is no need for him, but when there is a need for certain job to be done, it wakes the thread - gets the job done and goes back to sleep. I also want the jobs to be queued and be executed in the order they arrive. In cocoa/objective c there is an NSOperationQueue for that. I wonder if java has something similar.

您怎么看?

推荐答案

我会使用ExecutorService之类的

I would use an ExecutorService like

private final ExecutorService executor = Executors.newSingleThreadExecutor();

public void task(final int arg) {
    executor.execute(new Runnable() {
        @Override
        public void run() {
            // perform task using `arg`
        }
    });
}

该线程具有一个内置线程，该线程在添加任务时唤醒，在没有剩余任务时进入睡眠状态，这是队列任务的阻塞队列.

This has a built in thread which wakes when a tasks is added and sleeps when there is no tasks left, a Blocking Queue for queue tasks.

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