js.lang

Interface Callback<Value>

Type Parameters:

Value - value type returned by asynchronous logic.

public interface Callback<Value>

Piece of functionality executed after some asynchronous logic completion. It is designed to be used by - but not limited to, AsyncTask and remote method invocation, like in sample code listed below. On first example handle(Object) method is called transparently by asynchronous task after its execution completion.

 AsyncTask<Object> task = new AsyncTask<Object>(callback) {
        protected Object handle() throws Throwable {
                // asynchronous task logic;
        }
        // here asynchronous task logic invoke Callback#handle with value returned by above AsyncTask#execute
 };
 task.start();
 

 WeatherService weatherService = Factory.getInstance("http://hub.bbnet.ro/", WeatherService.class);
 weatherService.getCurrentWeather(47.1569, 27.5903, new Callback<Weather>() {
        public handle(Weather weather) {
                // do something useful with returned weather value
        }
 });
 

Version:

final

Author:

Iulian Rotaru

Method Summary

Modifier and Type	Method and Description
void	handle(Value value) Hook to be executed after asynchronous logic execution ends.

Method Detail

handle

void handle(Value value)

Hook to be executed after asynchronous logic execution ends. This method is meant to process given value in a sound manner and is not expected to throw exceptions.

Parameters:

value - value returned by asynchronous logic.