是否有使用当前线程的 ExecutorService?

问题描述

我所追求的是一种配置线程池使用与否的兼容方式.理想情况下，其余代码根本不应该受到影响.我可以使用带有 1 个线程的线程池，但这并不是我想要的.有什么想法吗?

What I am after is a compatible way to configure the use of a thread pool or not. Ideally the rest of the code should not be impacted at all. I could use a thread pool with 1 thread but that isn't quite what I want. Any ideas?

ExecutorService es = threads == 0 ? new CurrentThreadExecutor() : Executors.newThreadPoolExecutor(threads);

// es.execute / es.submit / new ExecutorCompletionService(es) etc

推荐答案

这是一个非常简单的 Executor(注意不是 ExecutorService)实现，它只使用当前线程.从Java Concurrency in Practice"(基本阅读)中窃取.

Here's a really simple Executor (not ExecutorService, mind you) implementation that only uses the current thread. Stealing this from "Java Concurrency in Practice" (essential reading).

public class CurrentThreadExecutor implements Executor {
    public void execute(Runnable r) {
        r.run();
    }
}

ExecutorService 是一个更复杂的接口，但可以用相同的方法处理.

ExecutorService is a more elaborate interface, but could be handled with the same approach.

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