Java CompletableFuture anyOf:线程队列只要有一个异步线程完成就触发(5)
private void method() throws ExecutionException, InterruptedException { CompletableFuture<String> f1 = CompletableFuture.supplyAsync(() -> { try { TimeUnit.SECONDS.sleep(3); } catch (InterruptedException e) { e.printStackTrace(); } return "f1"; }); f1.whenCompleteAsync(new BiConsumer<String, Throwable>() { @Override public void accept(String s, Throwable throwable) { System.out.println(System.currentTimeMillis() + ":" + s); } }); CompletableFuture<String> f2 = CompletableFuture.supplyAsync(() -> { try { TimeUnit.SECONDS.sleep(2); } catch (InterruptedException e) { e.printStackTrace(); } return "f2"; }); f2.whenCompleteAsync(new BiConsumer<String, Throwable>() { @Override public void accept(String s, Throwable throwable) { System.out.println(System.currentTimeMillis() + ":" + s); } }); CompletableFuture<Object> anyOf = CompletableFuture.anyOf(f1, f2); System.out.println("到这里了。"); }
输出:
06-13 08:52:20.883 18385-18385/zhangphil.test I/System.out: 到这里了。 06-13 08:52:22.897 18385-18412/zhangphil.test I/System.out: 1528851142896:f2 06-13 08:52:23.894 18385-18411/zhangphil.test I/System.out: 1528851143893:f1
anyOf,只要异步线程队列有一个任务率先完成就返回,这个特性可以用来获取最快的那个线程结果。