jQuery Promise style based on Backbone.Events

Deferred.js

define([
	'underscore',
	'backbone'
], function( _, Backbone ){


	function Deferred(){
		this.resolved = false;
		this.rejected = false;
	}
	
	_.extend( Deferred.prototype, Backbone.Events, {

		resolve: function( reason ){
			if( this.resolved || this.rejected ) return;
			this.trigger( 'resolve', reason );
			this.resolved = true;
			this.reason = reason;
			this.off(); //unbind all
		},

		notice: function( notice ){

		},

		reject: function( reason ){
			if( this.resolved || this.rejected ) return;
			this.trigger( 'resolve', reason );
			this.trigger( 'reject', reason );
			this.rejected = true;
			this.reason = reason;
			this.off(); //unbind all
		},

		done: function( func, context ){
			if( this.resolved ){
				//instant execute
				func.call( context || this, this.reason );
			}else{
				//bind for the future
				this.on('resolve', func, context);
			}
			return this; //allow to chain
		},

		fail: function( func, context ){
			if( this.rejected ){
				//instant execute
				func.call( context || this, this.reason );
			}else{
				//bind for the future
				this.on('reject', func, context);
			}
			return this; //allow to chain
		}

	});

	return Deferred;

});