The DestMetrics example is a JMS application that monitors a destination on a Sun Java(tm) System Message Queue broker
/*
* @(#)DestMetrics.java 1.3 04/01/05
*
* Copyright (c) 2000-2003 Sun Microsystems, Inc. All Rights Reserved.
*
* Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
* 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.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
* IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
* NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
* LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
* OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
* LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
* INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
* CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
* OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
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*
* This software is not designed or intended for use in on-line control of
* aircraft, air traffic, aircraft navigation or aircraft communications; or in
* the design, construction, operation or maintenance of any nuclear
* facility. Licensee represents and warrants that it will not use or
* redistribute the Software for such purposes.
*/
import java.util.Enumeration;
import java.util.Properties;
import javax.jms.*;
/**
* The DestMetrics example is a JMS application that monitors a
* destination on a Sun Java(tm) System Message Queue broker. It does so by
* subscribing to a topic named:
* mq.metrics.destination.queue.<dest_name> OR
* mq.metrics.destination.topic.<dest_name>
* Messages that arrive contain information describing the
* destination such as:
* - number of messages that flowed into this destination
* - number of messages that flowed out of this destination
* - size of message bytes that flowed into this destination
* - size of message bytes that flowed out of this destination
* - etc.
*
* Note that this example does not display all the information
* available in the destination metric message.
*
* This application takes the following arguments:
* -t dest_type Specify required destination type. Valid values
* are 't' or 'q'.
* -n dest_name Specify required destination name.
*
* By default DestMetrics 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 DestMetrics
*/
public class DestMetrics 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[]) {
String destName = null, destType = null;
for (int i = 0; i < args.length; ++i) {
if (args[i].equals("-n")) {
destName = args[i+1];
} else if (args[i].equals("-t")) {
destType = args[i+1];
}
}
if (destName == null) {
System.err.println("Need to specify destination name with -n");
System.exit(1);
}
if (destType == null) {
System.err.println("Need to specify destination type (t or q) with -t");
System.exit(1);
}
DestMetrics bm = new DestMetrics();
bm.initPrinter(destType, destName);
bm.initJMS();
bm.subscribeToMetric(destType, destName);
}
public DestMetrics() {
}
/*
* Initializes the class that does the printing, MetricsPrinter.
* See the MetricsPrinter class for details.
*/
private void initPrinter(String destType, String destName) {
String oneRow[] = new String[ 11 ], tmp;
int span[] = new int[ 11 ];
int i = 0;
mp = new MetricsPrinter(11, 2, "-", MetricsPrinter.CENTER);
mp.setTitleAlign(MetricsPrinter.CENTER);
i = 0;
span[i++] = 2;
span[i++] = 0;
span[i++] = 2;
span[i++] = 0;
span[i++] = 3;
span[i++] = 0;
span[i++] = 0;
span[i++] = 3;
span[i++] = 0;
span[i++] = 0;
span[i++] = 1;
i = 0;
oneRow[i++] = "Msgs";
oneRow[i++] = "";
oneRow[i++] = "Msg Bytes";
oneRow[i++] = "";
oneRow[i++] = "Msg Count";
oneRow[i++] = "";
oneRow[i++] = "";
oneRow[i++] = "Total Msg Bytes (k)";
oneRow[i++] = "";
oneRow[i++] = "";
oneRow[i++] = "Largest";
mp.addTitle(oneRow, span);
i = 0;
oneRow[i++] = "In";
oneRow[i++] = "Out";
oneRow[i++] = "In";
oneRow[i++] = "Out";
oneRow[i++] = "Current";
oneRow[i++] = "Peak";
oneRow[i++] = "Avg";
oneRow[i++] = "Current";
oneRow[i++] = "Peak";
oneRow[i++] = "Avg";
oneRow[i++] = "Msg (k)";
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(String destType, String destName) {
try {
if (destType.equals("q")) {
metricTopicName = "mq.metrics.destination.queue." + destName;
} else {
metricTopicName = "mq.metrics.destination.topic." + destName;
}
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[ 11 ];
int i = 0;
/*
* Extract destination metrics
*/
oneRow[i++] = Long.toString(mapMsg.getLong("numMsgsIn"));
oneRow[i++] = Long.toString(mapMsg.getLong("numMsgsOut"));
oneRow[i++] = Long.toString(mapMsg.getLong("msgBytesIn"));
oneRow[i++] = Long.toString(mapMsg.getLong("msgBytesOut"));
oneRow[i++] = Long.toString(mapMsg.getLong("numMsgs"));
oneRow[i++] = Long.toString(mapMsg.getLong("peakNumMsgs"));
oneRow[i++] = Long.toString(mapMsg.getLong("avgNumMsgs"));
oneRow[i++] = Long.toString(mapMsg.getLong("totalMsgBytes")/1024);
oneRow[i++] = Long.toString(mapMsg.getLong("peakTotalMsgBytes")/1024);
oneRow[i++] = Long.toString(mapMsg.getLong("avgTotalMsgBytes")/1024);
oneRow[i++] = Long.toString(mapMsg.getLong("peakMsgBytes")/1024);
mp.add(oneRow);
if ((rowsPrinted % 20) == 0) {
mp.print();
} else {
mp.print(false);
}
rowsPrinted++;
mp.clear();
} else {
System.err.println("Msg received: not broker metric type");
}
} catch (Exception e) {
System.err.println("onMessage: Exception caught: " + e);
}
}
}
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