cometdjs

A Simple HowTo:

Install the library

    npm install --save cometd

Include the library

    var cometD = require('cometd').cometD();

Subscribe to a topic

    cometD.topic = '/topic/exampleTopic';

Add a eventListener

    cometD.addEventListener('/topic/exampleTopic', function (topic, message) {});

Start the execution

    cometD.init(
        {
            token: "A optional Bearer token",
            url: 'http://urltoyourservice.com/cometd/26.0',
            debug: true
        }
    );

Multi Subscription

You have two options for subscribe more than one topic. You can use a wildcard in your topic like this:

    cometD.topic = '/topic/*';

If you use this, you can add a eventListener to each channel.

    cometD.addEventListener('/topic/topic1', function (topic, message) {});
    cometD.addEventListener('/topic/topic2', function (topic, message) {});

Or you can use only one handler function. You can also access the topicName:

    function myHandler(theTopicName, message){
      console.log(theTopicName);
    }

    cometD.addEventListener('/topic/topic1', myHandler);
    cometD.addEventListener('/topic/topic2', myHandler);

Sometime wildcards are not available. But this isn't a problem. The cometD object isn't a singleton. Each Instance has his own cookie.

    var topics = ['topic1', 'topic2'];

    function myCometDFunction(topic){
       var cometD = require('./cometD.js').cometD();

       cometD.topic = '/topic/' + topic;
       cometD.init(
           {
             token: "Bearer Token",
             url: 'http://aserviceurl.com/cometd/26.0',
             debug: true
           }
       );

       cometD.addEventListener('/topic/' + topic, function(topicName, message){});
     }


    for (var i = 0; i < topics.length; i++) {
      myCometDFunction(topics[i]);
    }