org.apache.activemq.artemis.jms.example.FederatedQueueExample Maven / Gradle / Ivy
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* http://www.apache.org/licenses/LICENSE-2.0
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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 org.apache.activemq.artemis.api.jms.ActiveMQJMSClient;
import org.apache.activemq.artemis.jms.client.ActiveMQConnectionFactory;
/**
* A simple example that demonstrates dynamic queue messaging routing between remote servers,
* as consumers come and go, routing based on priorities.
* using Queue Federation feature.
*/
public class FederatedQueueExample {
public static void main(final String[] args) throws Exception {
Connection connectionEUWest = null;
Connection connectionEUEast = null;
Connection connectionUSCentral = null;
try {
// Step 1. Instantiate the Queue
Queue queue = ActiveMQJMSClient.createQueue("exampleQueue");
// Step 2. Instantiate connection towards server EU West
ConnectionFactory cfEUWest = new ActiveMQConnectionFactory("tcp://localhost:61616");
// Step 3. Instantiate connection towards server EU East
ConnectionFactory cfEUEast = new ActiveMQConnectionFactory("tcp://localhost:61617");
// Step 4. Instantiate connection towards server US Central
ConnectionFactory cfUSCentral = new ActiveMQConnectionFactory("tcp://localhost:61618");
// Step 5. We create a JMS Connection connectionEUWest which is a connection to server EU West
connectionEUWest = cfEUWest.createConnection();
// Step 6. We create a JMS Connection connectionEUEast which is a connection to server EU East
connectionEUEast = cfEUEast.createConnection();
// Step 7. We create a JMS Connection connectionUSCentral which is a connection to server US Central
connectionUSCentral = cfUSCentral.createConnection();
// Step 8. We create a JMS Session on server EU West
Session sessionEUWest = connectionEUWest.createSession(false, Session.AUTO_ACKNOWLEDGE);
// Step 9. We create a JMS Session on server EU East
Session sessionEUEast = connectionEUEast.createSession(false, Session.AUTO_ACKNOWLEDGE);
// Step 10. We create a JMS Session on server US Central
Session sessionUSCentral = connectionUSCentral.createSession(false, Session.AUTO_ACKNOWLEDGE);
// Step 11. We start the connections to ensure delivery occurs on them
connectionEUWest.start();
connectionEUEast.start();
connectionUSCentral.start();
// Step 12. We create a JMS MessageProducer object on each server
MessageProducer producerEUWest = sessionEUWest.createProducer(queue);
MessageProducer producerEUEast = sessionEUEast.createProducer(queue);
MessageProducer producerUSCentral = sessionUSCentral.createProducer(queue);
// Step 13. We create JMS MessageConsumer objects on each server
MessageConsumer consumerEUWest = sessionEUWest.createConsumer(queue);
MessageConsumer consumerEUEast = sessionEUEast.createConsumer(queue);
MessageConsumer consumerUSCentral = sessionUSCentral.createConsumer(queue);
// Step 14. Let a little time for everything to start and form.
Thread.sleep(5000);
// Step 15. We send some messages to server EU West
final int numMessages = 10;
for (int i = 0; i < numMessages; i++) {
TextMessage message = sessionEUWest.createTextMessage("This is text sent from EU West, message " + i);
producerEUWest.send(message);
System.out.println("EU West :: Sent message: " + message.getText());
}
// Step 16. we now consume those messages on EU West demonstrating that messages will deliver to local consumer by priority.
for (int i = 0; i < numMessages; i++) {
TextMessage messageEUWest = (TextMessage) consumerEUWest.receive(5000);
System.out.println("EU West :: Got message: " + messageEUWest.getText());
}
// Step 17. We repeat the same local consumer priority check on US Central
for (int i = 0; i < numMessages; i++) {
TextMessage message = sessionEUWest.createTextMessage("This is text sent from US Central, message " + i);
producerUSCentral.send(message);
System.out.println("US Central:: Sent message: " + message.getText());
}
for (int i = 0; i < numMessages; i++) {
TextMessage messageUSCentral = (TextMessage) consumerUSCentral.receive(5000);
System.out.println("US Central:: Got message: " + messageUSCentral.getText());
}
// Step 18. We now close the consumer on EU West leaving it no local consumers.
consumerEUWest.close();
System.out.println("Consumer EU West now closed");
// Step 19. We now send some more messages to server EU West
for (int i = 0; i < numMessages; i++) {
TextMessage message = sessionEUWest.createTextMessage("This is text sent from EU West, message " + i);
producerEUWest.send(message);
System.out.println("EU West :: Sent message: " + message.getText());
}
// Step 20. we now consume those messages on EU East demonstrating that messages will re-route to the another broker based on upstream priority.
// As US Central is configured to be -1 priority compared to EU East, messages should re-route to EU East for its consumers to consume.
// If US Central and EU East were even priority then the re-direct would be loaded between the two.
for (int i = 0; i < numMessages; i++) {
TextMessage messageEUEast = (TextMessage) consumerEUEast.receive(5000);
System.out.println("EU East :: Got message: " + messageEUEast.getText());
}
// Step 21. We now close the consumer on US Central leaving it no local consumers.
consumerUSCentral.close();
System.out.println("Consumer US Central now closed");
// Step 19. We now send some more messages to server US Central
for (int i = 0; i < numMessages; i++) {
TextMessage message = sessionUSCentral.createTextMessage("This is text sent from US Central, message " + i);
producerUSCentral.send(message);
System.out.println("US Central:: Sent message: " + message.getText());
}
// Step 20. we now consume those messages on EU East demonstrating that its messages also can re-route, if no local-consumer.
for (int i = 0; i < numMessages; i++) {
TextMessage messageEUEast = (TextMessage) consumerEUEast.receive(5000);
System.out.println("EU East :: Got message: " + messageEUEast.getText());
}
// Step 21. Restart local consumers on EU West and US Central
consumerEUWest = sessionEUWest.createConsumer(queue);
System.out.println("Consumer EU West re-created");
consumerUSCentral = sessionUSCentral.createConsumer(queue);
System.out.println("Consumer US Central re-created");
// Step 22. we produce and consume on US Central, showing that dynamically re-adjusts now local consumers exist and messages delivery by priority to local consumer.
for (int i = 0; i < numMessages; i++) {
TextMessage message = sessionUSCentral.createTextMessage("This is text sent from US Central, message " + i);
producerUSCentral.send(message);
System.out.println("US Central:: Sent message: " + message.getText());
}
for (int i = 0; i < numMessages; i++) {
TextMessage messageUSCentral = (TextMessage) consumerUSCentral.receive(5000);
System.out.println("US Central:: Got message: " + messageUSCentral.getText());
}
// Step 23. we repeat the same test on EU West.
for (int i = 0; i < numMessages; i++) {
TextMessage message = sessionEUWest.createTextMessage("This is text sent from EU West, message " + i);
producerEUWest.send(message);
System.out.println("EU West :: Sent message: " + message.getText());
}
for (int i = 0; i < numMessages; i++) {
TextMessage messageEUWest = (TextMessage) consumerEUWest.receive(5000);
System.out.println("EU West :: Got message: " + messageEUWest.getText());
}
} finally {
// Step 24. Be sure to close our resources!
if (connectionEUWest != null) {
connectionEUWest.stop();
connectionEUWest.close();
}
if (connectionEUEast != null) {
connectionEUEast.stop();
connectionEUEast.close();
}
if (connectionUSCentral != null) {
connectionUSCentral.stop();
connectionUSCentral.close();
}
}
}
}
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