
org.apache.activemq.artemis.jms.example.ProducerRateLimitExample Maven / Gradle / Ivy
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/**
* 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.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Queue;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.naming.InitialContext;
import org.apache.activemq.artemis.common.example.ActiveMQExample;
/**
* This example demonstrates how a message producer can be limited to produce messages at a maximum rate
* specified in messages per sec.
*/
public class ProducerRateLimitExample extends ActiveMQExample
{
public static void main(final String[] args)
{
new ProducerRateLimitExample().run(args);
}
@Override
public boolean runExample() throws Exception
{
Connection 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
ConnectionFactory cf = (ConnectionFactory)initialContext.lookup("ConnectionFactory");
// Step 4. Create a JMS Connection
connection = cf.createConnection();
// Step 5. Create a JMS Session
Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
// Step 6. Create a JMS Message Producer
MessageProducer producer = session.createProducer(queue);
System.out.println("Will now send as many messages as we can in 10 seconds...");
// Step 7. Send as many messages as we can in 10 seconds
final long duration = 10000;
int i = 0;
long start = System.currentTimeMillis();
while (System.currentTimeMillis() - start <= duration)
{
TextMessage message = session.createTextMessage("This is text message: " + i++);
producer.send(message);
}
long end = System.currentTimeMillis();
double rate = 1000 * (double)i / (end - start);
System.out.println("We sent " + i + " messages in " + (end - start) + " milliseconds");
System.out.println("Actual send rate was " + rate + " messages per second");
// Step 8. For good measure we consumer the messages we produced.
MessageConsumer messageConsumer = session.createConsumer(queue);
connection.start();
System.out.println("Now consuming the messages...");
i = 0;
while (true)
{
TextMessage messageReceived = (TextMessage)messageConsumer.receive(5000);
if (messageReceived == null)
{
break;
}
i++;
}
System.out.println("Received " + i + " messages");
return true;
}
finally
{
// Step 9. Be sure to close our resources!
if (initialContext != null)
{
initialContext.close();
}
if (connection != null)
{
connection.close();
}
}
}
}
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