MediatorPattern

main.js

var Task = require('./task');
var NotificationService = require('./services/notificationService');
var AuditingService = require('./services/auditingService');
var LoggingService = require('./services/loggingService');
var mediator = require('./mediator');

var notificationService = new NotificationService();
var auditingService = new AuditingService();
var logginService = new LoggingService();

var task1 = new Task({name:"Tarea 1 de prueba"});

mediator.subscribe('complete', notificationService, notificationService.update);
mediator.subscribe('complete', logginService, logginService.update);
mediator.subscribe('complete', auditingService, auditingService.update);

task1.complete = function(){
    mediator.publish('complete', this);
    Task.prototype.complete.call(this);
}

task1.complete();

mediator.js

var mediator = (function(){
    var channels = {};

    var subscribe = function(channel, context, func){
        if(!mediator.channels[channel]){
            mediator.channels[channel] = [];
        }
        mediator.channels[channel].push({
            context: context,
            func: func
        });
    }

    var publish = function(channel){
        if(!this.channels[channel]){
            return false;
        }

        var args = Array.prototype.slice.call(arguments, 1);

        for(var i=0; i < mediator.channels[channel].length; i++){
            var sub = mediator.channels[channel][i];
            sub.func.apply(sub.context, args);
        }
    }

    return{
        channels: {},
        subscribe: subscribe,
        publish: publish
    }
}());

module.exports = mediator;

services_auditingService.js

var auditingService = function(){
    var message = "Auditing ";
    this.update = function(task){
        console.log(message + task.name);
    }
}

module.exports = auditingService;

services_loggingService.js

var loggingService = function(){
    var message = "Logging ";
    this.update = function(task){
        console.log(message + task.name);
    }
}

module.exports = loggingService;

services_notificationService.js

var notificationService = function(){
    var message = "Notifying h... ";
    this.update = function(task){
        console.log(message + task.name);
    }
}

module.exports = notificationService;

Task.js

var Task = function(data){
    this.name = data.name;
    this.completed = false;
}

Task.prototype.complete = function(){
    console.log('Completed task: ' + this.name);
    this.completed = true;
}

Task.prototype.save = function(){
    console.log('saving task: ' + this.name);
}

module.exports = Task;