Executing Java callback on a new thread

Question

On this project, a Manager performs event queuing, and to return the result of the event a callback is used (the callback does not extend Runnable)

Answer 1

I would have the thread which executes the task, also execute the call back. Instead of creating a Thread each time, I suggest you use an ExecutorService.

public static  void submit(ExecutorService service, 
                              Callable callable,
                              Consumer callback) {
    service.submit(() -> {
         try {
             callback.accept(callable.call());
         } catch (Throwable t) {
             // log the Throwable
         }
     });
 }