Event Dispatcher

Alongside standard event emitting mechanism, this library provides
some additional utilities like event aggregator and generic event dispatching
repository.

This is an AMD library. To use it with Node.js and other CommonJS modules
based environments I recommend
benderjs/autoloader.

This library is partially modeled after
symfony/EventDispatcher.

Examples

$3

#### Dispatching events

``JavaScript
require([
"Bender/EventDispatcher/Event",
"Bender/EventDispatcher/EventDispatcher"
], function (Event, EventDispatcher) {
var eventDispatcher = new EventDispatcher();

eventDispatcher.getSupportedEvents = function () {
return ["a"];
};

eventDispatcher.addListener("a", function (evt) {
console.log("hello %s!", evt.data.place); // hello world
});

eventDispatcher.dispatch("a", new Event({ place: "world" }));
});
`

#### Aggregating event dispatchers

`JavaScript
var auto = require("autoloader"),
eventAggregator,
eventDispatcherA,
eventDispatcherB,
Event = auto.load("Bender/EventDispatcher/Event"),
EventAggregator = auto.load("Bender/EventDispatcher/EventAggregator"),
EventDispatcher = auto.load("Bender/EventDispatcher/EventDispatcher");

eventAggregator = new EventAggregator();

eventDispatcherA.getSupportedEvents = function () {
return ["a"];
};

eventDispatcherB.getSupportedEvents = function () {
return ["b"];
};

eventAggregator.add(eventDispatcherA);
eventAggregator.add(eventDispatcherB);

eventAggregator.addListener("a", function (evt) {
console.log("hello %s!", evt.data.place); // hello world
});

eventAggregator.addListener("b", function (evt) {
console.log("hello %s!", evt.data.place); // hello planet
});

eventDispatcherA.dispatch("a", new Event({ place: "world" }));
eventDispatcherB.dispatch("b", new Event({ place: "planet" }));
`

$3

#### Exposing single module entry point using two combined modules

`JavaScript
// module/a.js

var eventAggregator,
eventDispatcherAB = require("foo").eventDispatcherAB,
eventDispatcherC = require("bar").eventDispatcherC;

eventAggregator = new EventAggregator();

eventAggregator.add(eventDispatcherAB);
eventAggregator.add(eventDispatcherC);

module.exports = eventAggregator;
`

`JavaScript
// module/b.js

var a = require("a");

// eventDispatcherAB is going to handle this
a.addListener("a", function () {});

// eventDispatcherAB is going to handle this
a.addListener("b", function () {});

// eventDispatcherC is going to handle this
a.addListener("c", function () {});
`

#### Generic repository based on event dispatcher

`JavaScript
define(["Bender/EventDispatcher/EventDispatcher/Repository"], function (Repository) {
var repository = new Repository();

repository.addListener(Repository.EVENT_ITEM_ADDED, function (evt) {
var item = evt.data.item,
repository = evt.data.repository;

console.log("added: " + item);

if (("world" === item) && 2148 !== (new Date().getFullYear())) {
// this one should not be here for some reason
repository.remove(item);
}
});

repository.addListener(Repository.EVENT_ITEM_REMOVED, function (evt) {
console.log("removed: " + evt.data.item);
});

repository.add("hello"); // added: hello
repository.add("world"); // added: world, removed: world
});
``

Semantic Versioning

This repository follows Semantic Versioning convention.