The BrokerMetrics example is a JMS application that monitors the Sun Java(tm) System Message Queue broker
/*
* @(#)BrokerMetrics.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
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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 BrokerMetrics example is a JMS application that monitors the
* Sun Java(tm) System Message Queue broker. It does so by subscribing to a
* topic named 'mq.metrics.broker'. The messages that arrive contain
* Broker metric information such as number of messages flowing in/out
* of the broker, size in bytes of messages flowing in/out etc.
*
* This application also shows how to use the timestamp in each metric
* message to calculate rates e.g. rate at which messages are flowing
* into the broker.
*
* This application takes the following arguments:
* -m ttl Show totals e.g. total/accumulative number of msgs
* that flowed in/out of the broker. This is the
* default.
* -m rts Show rates e.g. rate of mesasge flow in/out of
* broker.
*
* By default BrokerMetrics 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 BrokerMetrics implements MessageListener {
ConnectionFactory metricConnectionFactory;
Connection metricConnection;
Session metricSession;
MessageConsumer metricConsumer;
Topic metricTopic;
MetricsPrinter mp;
int rowsPrinted = 0;
boolean showTotals = true;
MapMessage previous = null;
public static void main(String args[]) {
boolean totals = true;
for (int i = 0; i < args.length; ++i) {
if (args[i].equals("-m")) {
String type = args[i+1];
if (type.equals("ttl")) {
totals = true;
} else if (type.equals("rts")) {
totals = false;
}
}
}
BrokerMetrics bm = new BrokerMetrics();
bm.showTotals = totals;
bm.initPrinter();
bm.initJMS();
bm.subscribeToMetric();
}
/*
* Initializes the class that does the printing, MetricsPrinter.
* See the MetricsPrinter class for details.
*/
private void initPrinter() {
String oneRow[] = new String[ 8 ];
int span[] = new int[ 8 ];
int i = 0;
mp = new MetricsPrinter(8, 2, "-", MetricsPrinter.CENTER);
mp.setTitleAlign(MetricsPrinter.CENTER);
span[i++] = 2;
span[i++] = 0;
span[i++] = 2;
span[i++] = 0;
span[i++] = 2;
span[i++] = 0;
span[i++] = 2;
span[i++] = 0;
i = 0;
if (showTotals) {
oneRow[i++] = "Msgs";
oneRow[i++] = "";
oneRow[i++] = "Msg Bytes";
oneRow[i++] = "";
oneRow[i++] = "Pkts";
oneRow[i++] = "";
oneRow[i++] = "Pkt Bytes";
oneRow[i++] = "";
} else {
oneRow[i++] = "Msgs/sec";
oneRow[i++] = "";
oneRow[i++] = "Msg Bytes/sec";
oneRow[i++] = "";
oneRow[i++] = "Pkts/sec";
oneRow[i++] = "";
oneRow[i++] = "Pkt Bytes/sec";
oneRow[i++] = "";
}
mp.addTitle(oneRow, span);
i = 0;
oneRow[i++] = "In";
oneRow[i++] = "Out";
oneRow[i++] = "In";
oneRow[i++] = "Out";
oneRow[i++] = "In";
oneRow[i++] = "Out";
oneRow[i++] = "In";
oneRow[i++] = "Out";
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 {
metricTopic = metricSession.createTopic("mq.metrics.broker");
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("mq.metrics.broker")) {
if (showTotals) {
doTotals(mapMsg);
} else {
doRates(mapMsg);
}
} else {
System.err.println("Msg received: not broker metric type");
}
} catch (Exception e) {
System.err.println("onMessage: Exception caught: " + e);
}
}
private void doTotals(MapMessage mapMsg) {
try {
String oneRow[] = new String[ 8 ];
int i = 0;
/*
* Extract broker 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("numPktsIn"));
oneRow[i++] = Long.toString(mapMsg.getLong("numPktsOut"));
oneRow[i++] = Long.toString(mapMsg.getLong("pktBytesIn"));
oneRow[i++] = Long.toString(mapMsg.getLong("pktBytesOut"));
mp.add(oneRow);
if ((rowsPrinted % 20) == 0) {
mp.print();
} else {
mp.print(false);
}
rowsPrinted++;
mp.clear();
} catch (Exception e) {
System.err.println("onMessage: Exception caught: " + e);
}
}
private void doRates(MapMessage mapMsg) {
String oneRow[] = new String[ 8 ];
int i = 0;
try {
if (previous == null) {
oneRow[i++] = "0";
oneRow[i++] = "0";
oneRow[i++] = "0";
oneRow[i++] = "0";
oneRow[i++] = "0";
oneRow[i++] = "0";
oneRow[i++] = "0";
oneRow[i++] = "0";
} else {
long prevVal, newVal, prevSecs, newSecs, tmp;
float secs;
prevSecs = previous.getLongProperty("timestamp");
newSecs = mapMsg.getLongProperty("timestamp");
secs = (float)(newSecs - prevSecs)/(float)1000;
oneRow[i++] = Long.toString(getRate(previous, mapMsg, secs, "numMsgsIn"));
oneRow[i++] = Long.toString(getRate(previous, mapMsg, secs, "numMsgsOut"));
oneRow[i++] = Long.toString(getRate(previous, mapMsg, secs, "msgBytesIn"));
oneRow[i++] = Long.toString(getRate(previous, mapMsg, secs, "msgBytesOut"));
oneRow[i++] = Long.toString(getRate(previous, mapMsg, secs, "numPktsIn"));
oneRow[i++] = Long.toString(getRate(previous, mapMsg, secs, "numPktsOut"));
oneRow[i++] = Long.toString(getRate(previous, mapMsg, secs, "pktBytesIn"));
oneRow[i++] = Long.toString(getRate(previous, mapMsg, secs, "pktBytesOut"));
}
previous = mapMsg;
mp.add(oneRow);
if ((rowsPrinted % 20) == 0) {
mp.print();
} else {
mp.print(false);
}
rowsPrinted++;
mp.clear();
} catch (Exception e) {
System.err.println("onMessage: Exception caught: " + e);
e.printStackTrace();
}
}
private long getRate(MapMessage previous, MapMessage mapMsg, float secs,
String propName) throws JMSException {
long prevVal, newVal, prevSecs, newSecs, tmp;
prevVal = previous.getLong(propName);
newVal = mapMsg.getLong(propName);
tmp = (long)((newVal - prevVal)/secs);
return (tmp);
}
}
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