The DestListMetrics example is a JMS application that monitors the destinations on a Sun Java(tm) System Message Queue broker
/*
* @(#)DestListMetrics.java 1.3 04/01/05
*
* Copyright (c) 2000-2003 Sun Microsystems, Inc. All Rights Reserved.
*
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* modify and redistribute this software in source and binary code form,
* provided that i) this copyright notice and license appear on all copies of
* the software; and ii) Licensee does not utilize the software in a manner
* which is disparaging to Sun.
*
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* IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
* NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
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* This software is not designed or intended for use in on-line control of
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*/
import java.util.Enumeration;
import java.util.Properties;
import java.util.Hashtable;
import javax.jms.*;
/**
* The DestListMetrics example is a JMS application that monitors the
* destinations on a Sun Java(tm) System Message Queue broker. It does so by
* subscribing to a topic named 'mq.metrics.destination_list'. The
* messages that arrive contain information describing the
* destinations that currently exist on the broker such as:
* - destination name
* - destination type
* - whether the destination is temporary or not
*
* By default DestListMetrics will connect to the broker running on localhost:7676.
* You can use -DimqAddressList attribute to change the host, port and
* transport:
*
* java -DimqAddressList=mq://<host>:<port>/jms DestListMetrics
*/
public class DestListMetrics implements MessageListener {
ConnectionFactory metricConnectionFactory;
Connection metricConnection;
Session metricSession;
MessageConsumer metricConsumer;
Topic metricTopic;
MetricsPrinter mp;
String metricTopicName = null;
int rowsPrinted = 0;
public static void main(String args[]) {
DestListMetrics dlm = new DestListMetrics();
dlm.initPrinter();
dlm.initJMS();
dlm.subscribeToMetric();
}
public DestListMetrics() {
}
/*
* Initializes the class that does the printing, MetricsPrinter.
* See the MetricsPrinter class for details.
*/
private void initPrinter() {
String oneRow[] = new String[ 3 ];
int i = 0;
mp = new MetricsPrinter(3, 2, "-");
oneRow[i++] = "Destination Name";
oneRow[i++] = "Type";
oneRow[i++] = "Is Temporary";
mp.addTitle(oneRow);
}
/**
* Create the Connection and Session etc.
*/
public void initJMS() {
try {
metricConnectionFactory = new com.sun.messaging.ConnectionFactory();
metricConnection = metricConnectionFactory.createConnection();
metricConnection.start();
// creating Session
// Transaction Mode: None
// Acknowledge Mode: Automatic
metricSession = metricConnection.createSession(false,
Session.AUTO_ACKNOWLEDGE);
} catch(Exception e) {
System.err.println("Cannot create metric connection or session: "
+ e.getMessage());
e.printStackTrace();
System.exit(1);
}
}
public void subscribeToMetric() {
try {
metricTopicName = "mq.metrics.destination_list";
metricTopic = metricSession.createTopic(metricTopicName);
metricConsumer = metricSession.createConsumer(metricTopic);
metricConsumer.setMessageListener(this);
} catch(JMSException e) {
System.err.println("Cannot subscribe to metric topic: "
+ e.getMessage());
e.printStackTrace();
System.exit(1);
}
}
/*
* When a metric message arrives
* - verify it's type
* - extract it's fields
* - print one row of output
*/
public void onMessage(Message m) {
try {
MapMessage mapMsg = (MapMessage)m;
String type = mapMsg.getStringProperty("type");
if (type.equals(metricTopicName)) {
String oneRow[] = new String[ 3 ];
/*
* Extract metrics
*/
for (Enumeration e = mapMsg.getMapNames();
e.hasMoreElements();) {
String metricDestName = (String)e.nextElement();
Hashtable destValues = (Hashtable)mapMsg.getObject(metricDestName);
int i = 0;
oneRow[i++] = (destValues.get("name")).toString();
oneRow[i++] = (destValues.get("type")).toString();
oneRow[i++] = (destValues.get("isTemporary")).toString();
mp.add(oneRow);
}
mp.print();
System.out.println("");
mp.clear();
} else {
System.err.println("Msg received: not destination list metric type");
}
} catch (Exception e) {
System.err.println("onMessage: Exception caught: " + e);
}
}
}
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