是否可以使用Guava链接异步调用？ [英] Is it possible to chain async calls using Guava?

问题描述

我想链接异步休息服务调用并在完成后进行单次回调。

I want to chain async rest service calls and have single callback when they finished.

是否可以使用guava进行回调？

Is it possible to do it with guava?

推荐答案

您可以使用 Futures.chain 链接 ListenableFuture s：

final ListeningExecutorService service1 = MoreExecutors.listeningDecorator(Executors.newFixedThreadPool(16));
final ListeningExecutorService service2 = MoreExecutors.listeningDecorator(Executors.newFixedThreadPool(16));

ListenableFuture<String> service1result = service1.submit(new Callable<String>() {
    @Override
    public String call() throws Exception {
        return "service1result";
    }
});

ListenableFuture<String> service2result = Futures.chain(service1result, new Function<String, ListenableFuture<String>>() {
    @Override
    public ListenableFuture<String> apply(final @Nullable String input) {
        return service2.submit(new Callable<String>() {
            @Override
            public String call() throws Exception {
                return Joiner.on(" -> ").join(input, "service2result");
            }
        });
    }
});

System.out.format("Result: %s\r\n", service2result.get());

终端代码输出：

> run-main training.Training
[info] Compiling 1 Java source to /home/remeniuk/projects/guava-training/target/scala-2.9.1/classes...
[info] Running training.Training 
Result: service1result -> service2result

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