使用两个不同类型的Guava ListenableFutures的结果 [英] Use the results of two Guava ListenableFutures of different types

问题描述

我有两个在其他线程上完成的ListenableFuture.每个未来都有不同的类型，我希望在它们都完成时使用它们的两个结果.

I have two ListenableFutures which are completed on other threads. Each future is of a different type, and I wish to use both of their results when they are both complete.

是否有一种优雅的方法可以使用番石榴来处理此问题?

Is there an elegant way to handle this using Guava?

推荐答案

Runnable listener = new Runnable() {
    private boolean jobDone = false;

    @Override
    public synchronized void run() {
        if (jobDone || !(future1.isDone() && future2.isDone())) {
            return;
        }
        jobDone = true;
        // TODO do your job
    }
};
future1.addListener(listener);
future2.addListener(listener);

不太优雅，但是应该做.

Not really elegant, but should do the job.

或者，更优雅，但是您需要强制转换:

Or, more elegant, but you'll need casts:

ListenableFuture<List<Object>> composedFuture = 
    Futures.allAsList(future1, future2);

这篇关于使用两个不同类型的Guava ListenableFutures的结果的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！