Java Examples

Gorizza Stomp library

This code will connect to the TRAIN_MVT_ALL_TOC topic and display all messages. It requires the Gozirra Stomp library.

N.B.

• You must ensure your National Rail topic subscription is consistent with the TOPIC variable
• You may receive a compiler warning relating to the declaration of the Map variable in the MyListener class. This cannot be removed without a change to the Gorizza library, but does not affect the compilation or functionality.
• The code has been successfully built using the following environment: Eclipse Luna SR1 (4.4.1), java 1.7.0_71, gorizza-0.4.1.jar

import net.ser1.stomp.Client;
import net.ser1.stomp.Listener;

/**
 * Example client that connects to the Network Rail ActiveMQ
 * and subscribes a listener to receive real-time messages
 * 
 * @author Martin.Swanson@blackkitetechnology.com
 */
public class MyClient {

	//Network Rail ActiveMQ server
	private static final String SERVER = "publicdatafeeds.networkrail.co.uk";
	
	// Server port for STOMP clients
	private static final int PORT = 61618;
	
	// Your account username, typically an email address
	private static final String USERNAME = "yourUserName";
	
	// Your account password
	private static final String PASSWORD = "yourPassword";
	
	// Example topic (this one is for Southern Train Movements)
	private static final String TOPIC = "/topic/TRAIN_MVT_ALL_TOC"; 
	
	public static void main(String[] args) throws Exception {
		new MyClient().go();
	}
	
	/*
	 * Connect to a single topic and subscribe a listener
	 * @throws Exception Too lazy to implement exception handling....
	 */
	private void go() throws Exception {
		System.out.println("| Connecting...");
		Client client = new Client(SERVER, PORT, USERNAME, PASSWORD);
		if (client.isConnected()) {
			System.out.println("| Connected to " + SERVER + ":" + PORT);
		} else {
			System.out.println("| Could not connect");
			return;
		}
		System.out.println("| Subscribing...");
		Listener listener = new MyListener();
		client.subscribe(TOPIC , listener);
		System.out.println("| Subscribed to " + TOPIC);
		System.out.println("| Waiting for message...");
	}	
}

import net.ser1.stomp.Listener;
import java.util.Map;
 
/**
 * Example listener process that receives messages 
 * in JSON format from the Network Rail ActiveMQ
 * 
 * @author Martin.Swanson@blackkitetechnology.com
 */
public class MyListener implements Listener {
    
	@Override
	public void message(Map header, String body) {
		System.out.println("| Got header: " + header);
		System.out.println("| Got body: " + body);
	}
}