Calling async method from another method without waiting/blocking

Question

I have one webservice which is called by client.

public class MyWebServiceClass {
    public int myMethod() {
        myAsyncMethodInAnotherClass();
        return 2;
    }
}

I have another class which is acync, this class have method

public void myAsyncMethodInAnotherClass() throws InterruptedException, ExecutionException {
    final Receiver receiver = new Receiver(); 
    ExecutorService executorService = Executors.newFixedThreadPool(10);

    Future future = executorService.submit(new Runnable() {
        public void run() {
            System.out.println("Asynchronous task");
            receiver.doSomeThingElse();
        }
    }); 

    executorService.shutdown();
}

I want myMethod() inside MyWebServiceClass should return 2 to the client, without waiting for process inside myAsyncMethodInAnotherClass(). Though I have created executorService but it is still waiting for method to complete before returning 2.

AFAIK, this should work properly. Why do you think it waits for the method to complete? — Codebender, Aug 13 '15 at 05:10
I am not using Spring or any annotation for Async. Its simply core java — Sanjeev Yadav, Aug 13 '15 at 05:10
It will wait for your method to complete. Why do you think it should work asynchronously? — Naman Gala, Aug 13 '15 at 05:11
@Codebender I run it in debug mode and 2 is return only after myAsyncMethodInAnotherCLass(); is executed fully. — Sanjeev Yadav, Aug 13 '15 at 05:11
Your `myAsyncMethodInAnotherCLass()` has to complete for the execution to return back to `mywebserviceclass()`. But your `doSomeThingElse()` will happen asynchronously. Is that not happening? — Codebender, Aug 13 '15 at 05:14
I dont want to wait for myAsyncMethodInAnotherCLass() to be completed. It should be Async. — Sanjeev Yadav, Aug 13 '15 at 05:15
possible duplicate of [How to asynchronously call a method in Java](http://stackoverflow.com/questions/1842734/how-to-asynchronously-call-a-method-in-java) — , Aug 13 '15 at 05:25
@Codebender you are right. Sanjeev can you comment `receiver` line and execute your code? — Naman Gala, Aug 13 '15 at 05:39
Have you considered the @Asynchronous? http://docs.oracle.com/javaee/6/tutorial/doc/gkkqg.html — javaauthority, Aug 13 '15 at 05:41
@NamanGala I run it but its waiting inside myAsyncMethodInAnotherCLass() to be completed. — Sanjeev Yadav, Aug 13 '15 at 05:53
@SanjeevYadav, I ran your code (with `final Receiver receiver = new Receiver();` commented), and it is working as expected. If you want I can give you my working code. — Naman Gala, Aug 13 '15 at 05:55
Just a side-note: Why do you create the ThreadPool with `newFixedThreadPool(10);` All it will ever use is one Thread. With a debugger have you tried jumping into myAsyncMethodInAnotherClass to figure out at which line it is blocking? Me too, I suspect the creation of `Receiver` to block for some reason. In the code you present it is not used. Is it in the actual code? — Fildor, Aug 13 '15 at 06:37

Calling async method from another method without waiting/blocking

0 Answers0