并行化REST调用的最佳方法是什么? [英] What's the best way to parallelize a REST call?

问题描述

我正在处理一些Java代码，该代码可以处理多个REST调用

I'm working on some java code, which processes multiple REST calls

call1()
call2()
call3()
...

我想并行化这些调用，但是要同步执行我的主代码.我用lamba和并行流制作了POC:

I want to parallelize these calls, but perform my main code synchronously. I made a POC with lamba and a parallel stream:

List<Runnable> list = new ArrayList();
list.add(() -> {call1()});
list.add(() -> {call2()});
list.add(() -> {call3()});
list.add(...);

list.parallelStream()
            .forEach(Runnable::run);

您还有其他解决方案吗?我还检查了使用泽西客户端的异步调用，但是这需要更多代码更改.

Do you have another solution? I also checked to use async calls from Jersey client instead, but this would need more code changes.

推荐答案

您所需要的只是异步运行您的呼叫.您可以使用 CompletableFuture s提交任务，然后等待它们完成:

All you're looking for is to run your calls asynchronously. You can use CompletableFutures to submit the task, and then wait for them to complete:

list.stream() //you don't really need a parallel stream
    .map(CompletableFuture::runAsync)
    .collect(Collectors.toList()) //make sure all tasks are submitted
    .stream()
    .forEach(CompletableFuture::join);

这将提交所有任务(以异步方式运行)，然后等待它们中的每一个完成运行.发生这种情况时，该方法将返回.

This will submit all tasks (to run asynchronously), and then wait for each of them to finish running. When that happens, the method will return.

您可能需要控制异步任务的线程池.这是一个使用10线程池的示例:

You may need to control the thread pool for your async tasks. This is an example using a 10-thread pool:

ExecutorService es = Executors.newFixedThreadPool(10);
list.stream()
    .map(r -> CompletableFuture.runAsync(r, es))
     ...

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