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pubsub.js
67 lines (53 loc) · 1.63 KB
/
pubsub.js
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/*
* Simple pub/sub.
*/
;(function(exports){
function PubSub () {
this.topics = {};
this.uid = -1;
}
PubSub.prototype.subscribe = function( topic, fn ){
if (!this.topics.hasOwnProperty(topic)){
this.topics[topic] = [];
}
this.topics[topic].push({
uid: ++(this.uid),
fn: fn
});
console.log("Subscribed to " + topic);
return this.uid;
};
PubSub.prototype.publish = function( topic, args ){
if (!this.topics.hasOwnProperty(topic)){
console.error("The topic " + topic + " does not exist.");
return false;
}
for (var t in this.topics[topic]){
this.topics[topic][t].fn(args);
}
return true;
};
PubSub.prototype.unsubscribe = function( uid ) {
for (var topic in this.topics) {
if (this.topics.hasOwnProperty(topic)) {
for (var i = this.topics[topic].length-1; i >= 0; i--) {
var t = this.topics[topic][i];
if (t.uid === uid) {
this.topics[topic].splice(i, 1);
if (this.topics[topic].length === 0) {
delete this.topics[topic];
}
removedUid = uid;
console.log("Unsubscribe successful!");
}
}
}
}
return false;
};
PubSub.prototype.print = function() {
console.log(this.topics);
return;
};
exports.PubSub = PubSub;
})(this);