Event Aggregator

/**

 * Created with JetBrains WebStorm.

 * User: 宇乔

 * Date: 13-8-2

 * Time: 下午3:01

 * To change this template use File | Settings | File Templates.

 */



function Event(name) {



    var handlers = [];



    this.getName = function () {

        return name;

    }



    this.addHandler = function (handler) {

        handlers.push(handler);

    }

    this.removeHandler = function (handler) {

        handlers.forEach(function (item, i) {

            if (item == handler) {

                handler.splice(i, 1);

            }

        })

    }



    this.fire = function (eventArgs) {

        handlers.forEach(function (h) {

            h(eventArgs);

        })

    }

}





function EventAggregator() {

    var events = [];



    function getEvent(name) {

        var fn;

        events.forEach(function (item) {

            if (item.getName() == name) {

                fn = item;

                return;

            }

        });

        return fn;

    }



    this.subscribe = function (eventName, handler) {



        var event = getEvent(eventName);



        if (!event) {

            event = new Event(eventName);

            events.push(event);

        }

        event.addHandler(handler);

    }



    this.publish = function (eventName, eventArgs) {



        var event = getEvent(eventName);

        if (!event) {

            event = new Event(eventName);

            events.push(event);

        }

        event.fire(eventArgs);

    }

}