Using a Queue

This JavaScript code snippet demonstrates how to create a queue object, which allows you to publish or subscribe to a Universal Messaging queue:

var myQueue = mySession.getQueue("/demo/prices");

Note that unlike the Enterprise APIs, the JavaScript API does not support programmatic creation of queues; instead, you can use the Enterprise Manager GUI to create a Universal Messaging Queue.

A queue object offers several methods. Three of the more important ones are:

• myQueue.subscribe()
• myQueue.unsubscribe()
• myQueue.publish(Event event)

Please see JavaScript API Documentation for Queues for information on all available methods on a queue.

Each of the above methods can invoke one or more optional user-specified callback functions which you can (and probably should) implement and assign as follows:

var myQueue = mySession.getQueue("/demo/prices");

// Assign a handler function for Universal Messaging Events received on the Queue, 
// then subscribe:
function myEventHandler(event) {
        var dictionary = event.getDictionary();
        console.log(dictionary.get("name") + " " + dictionary.get("bid"));
}

myQueue.on(Nirvana.Observe.DATA, myEventHandler);

myQueue.subscribe();
 

See Subscribing to a Queue and Publishing Events to a Queue.