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timeout control of a CompletableFuture for JDK 9 and above

CompletableFuture.supplyAsync(() -> { Thread.sleep(200); } ).orTimeout(1, TimeUnit.SECONDS);

apply when any of the CompletableFuture finished: applyToEither

wait all tasks to be finished: allOf

CompletableFuture cf1 = demoServiceAsyncExecutor.async(service -> service.hello("123"));

CompletableFuture cf2 = demoServiceAsyncExecutor.async(service -> service.hello("456"));

WebClient cf3 = CompletableFuture.supplyAsync(() -> getDb(id), ThreadPoolConfig.ASYNC_TASK_EXECUTOR);

return CompletableFuture.allOf(cf1, cf2, cf3) .thenApply(r -> cf1.join() + cf2.join() + dbFuture.join()).join();