Custom Callback Handler

Question

I am trying to understand mechanism of callback handler. How is the handle() method invoked? Can anybody give an example of usage of custom callback handler (other than those used in Login Modules of JASS or so) in non Swing application?

Answer 1

Define an interface to handle the callback.

public interface ServiceListener<T> {
    void callback(T result);
}

Define a method that takes ServiceListener as parameter and returns void.

Public void runInBackground(ServiceListener listener) {
    ...code that runs in the background...
    listener.callback(...data to return to caller...);
}

And you can now do this from your main code:

 runInBackground(new ServiceListener() {


        @Override
        public void callback(..returned data...) {
            ...Do stuff with returned data...
        }
 });