How to use AsyncRestTemplate to make multiple calls simultaneously?

Question

I don\'t understand how to use AsyncRestTemplate effectively for making external service calls. For the code below:

class Foo {

    public void doS         


        

Answer 1

What I Understand by Your question is You have a predefined asynchronous method and you try to do is call this method asynchoronously using RestTemplate Class.

I have wrote a method that will help you out to call Your method asynchoronously.

 public void testMyAsynchronousMethod(String... args) throws Exception {
        // Start the clock
        long start = System.currentTimeMillis();

        // Kick of multiple, asynchronous lookups
        Future future1 = asyncRestTemplate
        .getForEntity(url1, String.class);;
        Future future2 = asyncRestTemplate
        .getForEntity(url2, String.class);
        Future future3 = asyncRestTemplate
        .getForEntity(url3, String.class);

        // Wait until they are all done
        while (!(future1 .isDone() && future2.isDone() && future3.isDone())) {
            Thread.sleep(10); //10-millisecond pause between each check
        }

        // Print results, including elapsed time
        System.out.println("Elapsed time: " + (System.currentTimeMillis() - start));
        System.out.println(future1.get());
        System.out.println(future2.get());
        System.out.println(future3.get());
    }