Is there a non-blocking method analogous to ExecutorService invokeAll?

Question

Java's ExecutorService interface defines a method called invokeAll which takes in a Collection of Callable objects to be processed concurrently. However, the invokeAll method itself waits for all of the tasks to finish running before returning, making it a blocking method.

In my test environment I don't care about the return values of these tasks, I just need them to run concurrently. Now, I know I can manually create new Thread or Runnable objects and start them up myself, but it would be nice and clean if I could simply create a Collection of Runnable or Callable objects and pass them off to a method that starts executing them for me and immediately returns.

Does anybody know of an existing library Class that has the method I am describing? I could not find one while doing some research.

Answer 1

I'm actually surprised invokeAll behaves like this. The submit method doesn't block, so it's just a matter of calling that for each task:

public static <T> Collection<Future<T>> submitAll(ExecutorService service, Collection<? extends Callable<T>> tasks) {
    Collection<Future<T>> futures = new ArrayList<>(tasks.size());
    for (Callable<T> task: tasks) {
        futures.add(service.submit(task));
    }
    return futures;
}