/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.activemq.artemis.jms.example;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Queue;
import javax.jms.QueueConnection;
import javax.jms.QueueConnectionFactory;
import javax.jms.QueueSession;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.management.MBeanServerConnection;
import javax.management.MBeanServerInvocationHandler;
import javax.management.ObjectName;
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorFactory;
import javax.management.remote.JMXServiceURL;
import javax.naming.InitialContext;
import java.util.HashMap;
import org.apache.activemq.artemis.api.core.RoutingType;
import org.apache.activemq.artemis.api.core.SimpleString;
import org.apache.activemq.artemis.api.core.management.MessageCounterInfo;
import org.apache.activemq.artemis.api.core.management.ObjectNameBuilder;
import org.apache.activemq.artemis.api.core.management.QueueControl;
/**
* An example showing how to use message counters to have information on a queue.
*/
public class MessageCounterExample {
private static final String JMX_URL = "service:jmx:rmi:///jndi/rmi://localhost:3001/jmxrmi";
public static void main(final String[] args) throws Exception {
QueueConnection connection = null;
InitialContext initialContext = null;
try {
// Step 1. Create an initial context to perform the JNDI lookup.
initialContext = new InitialContext();
// Step 2. Perfom a lookup on the queue
Queue queue = (Queue) initialContext.lookup("queue/exampleQueue");
// Step 3. Perform a lookup on the Connection Factory
QueueConnectionFactory cf = (QueueConnectionFactory) initialContext.lookup("ConnectionFactory");
// Step 4.Create a JMS Connection, session and a producer for the queue
connection = cf.createQueueConnection();
QueueSession session = connection.createQueueSession(false, Session.AUTO_ACKNOWLEDGE);
MessageProducer producer = session.createProducer(queue);
// Step 5. Create and send a Text Message
TextMessage message = session.createTextMessage("This is a text message");
producer.send(message);
System.out.println("Sent message: " + message.getText());
// Step 6. Sleep a little bit so that the queue is sampled
System.out.println("Sleep a little bit to have the queue sampled...");
Thread.sleep(3000);
// Step 7. Use JMX to retrieve the message counters using the JMSQueueControl
ObjectName on = ObjectNameBuilder.DEFAULT.getQueueObjectName(SimpleString.toSimpleString(queue.getQueueName()), SimpleString.toSimpleString(queue.getQueueName()), RoutingType.ANYCAST);
JMXConnector connector = JMXConnectorFactory.connect(new JMXServiceURL(JMX_URL), new HashMap<String, Object>());
MBeanServerConnection mbsc = connector.getMBeanServerConnection();
QueueControl queueControl = MBeanServerInvocationHandler.newProxyInstance(mbsc, on, QueueControl.class, false);
// Step 8. List the message counters and convert them to MessageCounterInfo data structure.
String counters = queueControl.listMessageCounter();
MessageCounterInfo messageCounter = MessageCounterInfo.fromJSON(counters);
// Step 9. Display the message counter
displayMessageCounter(messageCounter);
// Step 10. Sleep again to have the queue sampled again
System.out.println("Sleep a little bit again...");
Thread.sleep(3000);
// Step 11. List the messages counters again
counters = queueControl.listMessageCounter();
messageCounter = MessageCounterInfo.fromJSON(counters);
displayMessageCounter(messageCounter);
// Step 12. Create a JMS consumer on the queue
MessageConsumer consumer = session.createConsumer(queue);
// Step 13. Start the connection to receive messages on the consumer
connection.start();
// Step 14. Receive a JMS message from the queue. It corresponds to the message sent at step #5
TextMessage messageReceived = (TextMessage) consumer.receive(5000);
System.out.format("Received message: %s%n%n", messageReceived.getText());
// Step 15. Sleep on last time to have the queue sampled
System.out.println("Sleep a little bit one last time...");
Thread.sleep(3000);
// Step 16. Display one last time the message counter
counters = queueControl.listMessageCounter();
messageCounter = MessageCounterInfo.fromJSON(counters);
displayMessageCounter(messageCounter);
} finally {
// Step 17. Be sure to close our JMS resources!
if (initialContext != null) {
initialContext.close();
}
if (connection != null) {
connection.close();
}
}
}
private static void displayMessageCounter(final MessageCounterInfo counter) {
System.out.format("%s (sample updated at %s)%n", counter.getName(), counter.getUdpateTimestamp());
System.out.format(" %s message(s) added to the queue (since last sample: %s)%n", counter.getCount(), counter.getCountDelta());
System.out.format(" %s message(s) in the queue (since last sample: %s)%n", counter.getDepth(), counter.getDepthDelta());
System.out.format(" last message added at %s%n%n", counter.getLastAddTimestamp());
}
}