java中的线程间通信 [英] inter thread communication in java

问题描述

彼此依赖的线程如何用Java进行通信？

How do threads that rely on one another communicate in Java?

例如，我正在构建一个带有线程的Web爬虫，这些线程需要来自其他线程的数据。

For example, I am building a web crawler with threads that need data that comes from other threads.

推荐答案

这取决于沟通的性质。

• 它是双工的（即A与B和B对话是否与A对话）？


• 是完成的数据通信还是通信？


• 依此类推。

• Is it duplex (ie A talks to B and B talks to A)?
• Is it communication of data or communication of completion?
• and so on.

最简单，最可取的线程间通信形式是只是等待其他线程的完成。使用 Future 最容易做到：

The simplest and most advisable form of inter-thread communication is simply to wait for the completion of other threads. That's most easily done by using Future:

ExecutorService exec = Executors.newFixedThreadPool(50);
final Future f = exec.submit(task1);
exec.submit(new Runnable() {
    @Override
    public void run() {
        f.get();
        // do stuff
    }
});

第二项任务在第一项任务完成前不会执行。

The second task won't execute until the first completes.

Java 5+有许多并发实用程序来处理这类事情。这可能意味着使用 LinkedBlockingQueue s， CountDownLatch 或许多其他人。

Java 5+ has many concurrent utilities for dealing with this kind of thing. This could mean using LinkedBlockingQueues, CountDownLatch or many, many others.

深入检查并发性< a href =http://rads.stackoverflow.com/amzn/click/0321349601 =noreferrer> Java Concurrency in Practice 是必读的。

For an in-depth examination of concurrency Java Concurrency in Practice is a must-read.

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