lightstreamer-jms-node-client

Lightstreamer JMS Extender Node.js Client

Overview

The Lightstreamer JMS Extender Node.js Client enables any JavaScript application running on the Node.js runtime to act as a JMS client, that is, ready to connect to a JMS broker via Lightstreamer JMS Extender.

The library is designed to be as class-by-class and method-by-method equivalent to JMS API 2.0 as possible.

Installation

The library is available as npm package, so you can download and install it through:

npm install lightstreamer-jms-node-client

Development

Access the module:

const jms = require("lightstreamer-jms-node-client");

Open a session against Lightstreamer JMS Extender, create a Topic Connection and connect to the JMS broker:

jms.TopicConnectionFactory.createTopicConnection("http://localhost:8080/", "ActiveMQ", null, null, {
  onConnectionCreated: function(conn) {
    var topicSession = conn.createSession(false, "PRE_ACK");
    .....
    conn.start();
  }
});

Create a Topic Subscription and send it to the broker:

var topic = topicSession.createTopic("stocksTopic");
var consumer = topicSession.createConsumer(topic, null);

Listen for messages:

consumer.setMessageListener({
  onMessage: function(message) {
    var feedMessage = message.getObject();
    var key = feedMessage.itemName;
    var values = feedMessage.currentValues;
    console.log(values["stock_name"] + ": " + values["last_price"]);
  }
});

Compatibility

• Compatible with JMS Extender since 2.0.0.
• Based on Lightstreamer SDK for Node.js Clients version 8.0.5 build 1791.
• Compatible with code developed with the previous version.

Changelog

See detailed changes here.

Documentation

• API Reference
• Chapter "Client Application Development" of JMS Extender Documentation