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dispatcher.js
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dispatcher.js
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// http://gist.github.com/427713
/* Ismael Celis 2010
Simplified WebSocket events dispatcher (no channels, no users)
// conn is an instance of WebSocket
var socket = new ServerEventDispatcher(conn);
// bind to server events
socket.bind('some_event', function(data){
alert(data.name + ' says: ' + data.message)
});
// broadcast events to all connected users
socket.trigger( 'some_event', {name: 'ismael', message : 'Hello world'} );
*/
var ServerEventDispatcher = function (conn) {
var callbacks = {},
dispatch;
this.bind = function (event_name, callback) {
callbacks[event_name] = callbacks[event_name] || [];
callbacks[event_name].push(callback);
return this; // chainable
};
this.trigger = function (event_name, data) {
var payload = JSON.stringify([event_name, data]);
conn.send(payload); // <= send JSON data to socket server
return this;
};
// dispatch to the right handlers
conn.onmessage = function (evt) {
var data = JSON.parse(evt.data),
event_name = data[0],
message = data[1];
dispatch(event_name, message);
};
conn.onclose = function () {
dispatch('close', null);
};
conn.onopen = function () {
dispatch('open', null);
};
dispatch = function (event_name, message) {
var chain = callbacks[event_name];
if (typeof chain === 'undefined') {
// no callbacks for this event
return;
}
for (var i in chain) {
chain[i](message);
}
};
};