ActorPubSub

ActorPubSub is a dependency free publish/subscribe library for JavaScript based on the Actor Model. It takes a lot of inspiration from PubSubJS and uses the ideas from Actors Make Better Observers to implement the required actors. It can be used as a normal pub/sub library as all the actor logic is hidden away.

A major benefit of this implementation is that observer list updates do not block the notification process.

Features

• Dependency free.
• Synchronization decoupling.
• Attaching and detaching subscribers is also asynchronous.
• Since observer list updates are asynchronous, notify operations are possible while updates are in progress.
• Data passed to subscribers is a copy of the original data, thus, changes to it by the subscribers does not affect other subscribers and the publisher.

Examples

Basic Example

var subscriberCb = function (msg, data) {
    console.log(msg, data);
};
 
var token = PubSub.subscribe('Topic', subscriberCb);
 
PubSub.publish('Topic', 'ahoy!');

Cancel specific subscription

// create a function to receive the topic
var mySubscriber = function( msg, data ){
    console.log( msg, data );
};
 
// add the function to the list of subscribers to a particular topic
// we're keeping the returned token, in order to be able to unsubscribe
// from the topic later on
var token = PubSub.subscribe( 'MY TOPIC', mySubscriber );
 
// unsubscribe this subscriber from this topic
PubSub.unsubscribe( token );

Cancel all subscriptions for a function

// create a function to receive the topic
var mySubscriber = function( msg, data ){
    console.log( msg, data );
};
 
// unsubscribe mySubscriber from ALL topics
PubSub.unsubscribe( mySubscriber );