All IT Courses 50% Off
JAVA Tutorials

How to Configure Topic/Queue on Active MQ?

Configure Topic

Configure Topic is when a publisher sends a message, there may be more than one customer interested in such messages. Publisher broadcasts the message to JMS destination called a topic.

Step 1: Create dependencies in pom.xml

<project xmlns="https://maven.apache.org/POM/4.0.0" xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="https://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.example.jms</groupId>
    <artifactId>springJmsQueue</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <dependencies>
        <dependency>
            <groupId>org.apache.activemq</groupId>
            <artifactId>activemq-all</artifactId>
            <version>5.12.0</version>
        </dependency>
    </dependencies>     
</project>

Step 2: Create a Topic named as JmsTopicExample

import java.net.URI;
import java.net.URISyntaxException; 
import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.Topic; 
import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.broker.BrokerFactory;
import org.apache.activemq.broker.BrokerService; 
public class JmsTopicExample {
    public static void main(String arg[]) throws Exception {
        BrokerService broker = BrokerFactory.createBroker(new URI(
                "broker:(tcp://localhost:61616)"));
        broker.start();
        Connection connection = null;
        try {
            // Producer
            ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(
                    "tcp://localhost:61616");
            connection = connectionFactory.createConnection();
            Session session = connection.createSession(false,
                    Session.AUTO_ACKNOWLEDGE);
            Topic topic = session.createTopic("customerTopic");                  
            // Consumer1 subscribes to customerTopic
            MessageConsumer consumer1 = session.createConsumer(topic);
            consumer1.setMessageListener(new ConsumerMessageListener("Consumer1"));             
            // Consumer2 subscribes to customerTopic
            MessageConsumer consumer2 = session.createConsumer(topic);
            consumer2.setMessageListener(new ConsumerMessageListener("Consumer2"));             
            connection.start();                  
            // Publish
            String payload = "Important Task";
            Message msg = session.createTextMessage(payload);
            MessageProducer producer = session.createProducer(topic);
            System.out.println("Sending text '" + payload + "'");
            producer.send(msg);             
            Thread.sleep(3000);
            session.close();
        } finally {
            if (connection != null) {
                connection.close();
            }
            broker.stop();
        }
    }
}

Step 3: Consume messages from Topic using MessageListener named as ConsumerMessageListener

import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.TextMessage; 
public class ConsumerMessageListener implements MessageListener {
    private String consumerName;
    public ConsumerMessageListener(String consumerName) {
        this.consumerName = consumerName;
    } 
    public void onMessage(Message message) {
        TextMessage textMessage = (TextMessage) message;
        try {
            System.out.println(consumerName + " received " + textMessage.getText());
        } catch (JMSException e) {          
            e.printStackTrace();
        }
    } 
}

Configure Queue

JMS Message queue is a destination to which producers send messages. The consumer connects to the broker to receive the message sitting in the queue. The Queue is used in point-to-point messaging.

Step 1: Create dependencies in pom.xml

<project xmlns="https://maven.apache.org/POM/4.0.0" xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="https://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.example.jms</groupId>
    <artifactId>springJmsQueue</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <dependencies>
        <dependency>
            <groupId>org.apache.activemq</groupId>
            <artifactId>activemq-all</artifactId>
            <version>5.12.0</version>
        </dependency>
    </dependencies>
     
</project>

Step 2: Create a Queue

Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
Queue queue = session.createQueue(“customerQueue”);

Step 3: Send message to a queue

MessageProducer producer = session.createProducer(queue);
producer.send(msg);

Step 4: Receive message from Queue named as JmsMessageQueueExample

import java.net.URI;
import java.net.URISyntaxException; 
import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Queue;
import javax.jms.Session;
import javax.jms.TextMessage; 
import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.broker.BrokerFactory;
import org.apache.activemq.broker.BrokerService; 
public class JmsMessageQueueExample {
public static void main(String arg[]) throws Exception {
        BrokerService broker = BrokerFactory.createBroker(new URI(
                "broker:(tcp://localhost:61616)"));
        broker.start();
        Connection connection = null;
        try {
            // Producer
            ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(
                    "tcp://localhost:61616");
            connection = connectionFactory.createConnection();
            Session session = connection.createSession(false,
                    Session.AUTO_ACKNOWLEDGE);
            Queue queue = session.createQueue("customerQueue");
            String payload = "Important Task";
            Message msg = session.createTextMessage(payload);
            MessageProducer producer = session.createProducer(queue);
            System.out.println("Sending text '" + payload + "'");
            producer.send(msg); 
            // Consumer
            MessageConsumer consumer = session.createConsumer(queue);
            connection.start();
            TextMessage textMsg = (TextMessage) consumer.receive();
            System.out.println(textMsg);
            System.out.println("Received: " + textMsg.getText());
            session.close();
        } finally {
            if (connection != null) {
                connection.close();
            }
                        broker.stop();
        }
    }

Facebook Comments
Tags

Related Articles

Back to top button
Close
Close