JS шаблон медиатор

mediator.js

var mediator = (function() {
    var subscribe = function(channel, fn) {
        if (!mediator.channels[channel]) mediator.channels[channel] = [];
        mediator.channels[channel].push({ context: this, callback: fn });
        return this;
    },
 
    publish = function(channel) {
        if (!mediator.channels[channel]) return false;
        var args = Array.prototype.slice.call(arguments, 1);
        for (var i = 0, l = mediator.channels[channel].length; i < l; i++) {
            var subscription = mediator.channels[channel][i];
            subscription.callback.apply(subscription.context, args);
        }
        return this;
    };
 
    return {
        channels: {},
        publish: publish,
        subscribe: subscribe,
        installTo: function(obj) {
            obj.subscribe = subscribe;
            obj.publish = publish;
        }
    };
 
}());
 
 
 
 
 
//примеры работы
//Pub/sub on a centralized mediator
 
mediator.name = "tim";
mediator.subscribe('nameChange', function(arg) {
    console.log(this.name);
    this.name = arg;
    console.log(this.name);
});
 
mediator.publish('nameChange', 'david'); //tim, david
 
 
//Pub/sub via third party mediator
 
var obj = {name: 'sam'};
mediator.installTo(obj);
obj.subscribe('nameChange', function(arg) {
    console.log(this.name);
    this.name = arg;
    console.log(this.name);
});
 
obj.publish('nameChange', 'john'); //sam, john




//пример первый
function Daddy() { }
Daddy.prototype =
{
    constructor: Daddy,
 
    getBeer: function ()
    {
        if (!kitchen.tryToGetBeer())
        {
            console.log("Daddy: Who the hell drank all my beer?");
            return false;
        }
 
        console.log("Daddy: Yeeah! My beer!");
        kitchen.oneBeerHasGone();
        return true;
    },
    argue_back: function () { console.log("Daddy: it's my last beer, for shure!"); }
}
 
function Mammy() { }
Mammy.prototype =
{
    constructor: Mammy,
 
    argue: function ()
    {
        console.log("Mammy: You are f*king alconaut!");
        kitchen.disputeStarted();
    }
}
 
function BeerStorage(beer_bottle_count)
{
    this._beer_bottle_count = beer_bottle_count;
}
BeerStorage.prototype =
{
    constructor: BeerStorage,
 
    takeOneBeerAway: function ()
    {
        if (this._beer_bottle_count == 0) return false;
        this._beer_bottle_count--;
        return true;
    }
}
 
 
var kitchen =
{
    daddy: new Daddy(),
    mammy: new Mammy(),
    refrigerator: new BeerStorage(3),
    stash: new BeerStorage(2),
 
    tryToGetBeer: function ()
    {
        if (this.refrigerator.takeOneBeerAway()) return true;
        if (this.stash.takeOneBeerAway()) return true;
 
        return false
    },
    oneBeerHasGone: function (){ this.mammy.argue(); },
    disputeStarted: function (){ this.daddy.argue_back(); }
}
 
 
var round_counter = 0;
while (kitchen.daddy.getBeer())
{
    round_counter++
    console.log( round_counter + " round passed"); 
}
 
 
 
 
//пример второй
function Player(name) {
	this.points = 0;
	this.name = name;
}
Player.prototype.play = function () {
	this.points += 1;
	mediator.played();
};
var scoreboard = {
 
	// HTML element to be updated
	element:document.getElementById('results'),
 
	// update the score display
	update:function (score) {
		var i, msg = '';
		for (i in score) {
			if (score.hasOwnProperty(i)) {
				msg += '<p><strong>' + i + '<\/strong>: ';
				msg += score[i];
				msg += '<\/p>';
			}
		}
		this.element.innerHTML = msg;
	}
};
 
var mediator = {
 
	// all the player
	players:{},
 
	// initialization
	setup:function () {
		var players = this.players;
		players.home = new Player('Home');
		players.guest = new Player('Guest');
	},
 
	// someone plays, update the score
	played:function () {
		var players = this.players,
				score = {
					Home:players.home.points,
					Guest:players.guest.points
				};
 
		scoreboard.update(score);
	},
 
	// handle user interactions
	keypress:function (e) {
		e = e || window.event; // IE
		if (e.which === 49) { // key "1"
			mediator.players.home.play();
			return;
		}
		if (e.which === 48) { // key "0"
			mediator.players.guest.play();
			return;
		}
	}
};
 
// go!
mediator.setup();
window.onkeypress = mediator.keypress;
 
// game over in 30 seconds
setTimeout(function () {
	window.onkeypress = null;
	console.log('Game over!');
}, 30000);