/**
* 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.
*/
import java.io.IOException;
import java.util.Arrays;
import java.util.ArrayList;
import java.util.Iterator;
import javax.jms.Connection;
import javax.jms.DeliveryMode;
import javax.jms.Destination;
import javax.jms.ExceptionListener;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageListener;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.jms.Topic;
import org.apache.activemq.ActiveMQConnection;
import org.apache.activemq.ActiveMQConnectionFactory;
/**
* A simple tool for consuming messages
*
*
*/
public class ConsumerTool extends Thread implements MessageListener, ExceptionListener {
private boolean running;
private Session session;
private Destination destination;
private MessageProducer replyProducer;
private boolean pauseBeforeShutdown = false;
private boolean verbose = true;
private int maxiumMessages;
private static int parallelThreads = 1;
private String subject = "TOOL.DEFAULT";
private boolean topic;
private String user = ActiveMQConnection.DEFAULT_USER;
private String password = ActiveMQConnection.DEFAULT_PASSWORD;
private String url = ActiveMQConnection.DEFAULT_BROKER_URL;
private boolean transacted;
private boolean durable;
private String clientId;
private int ackMode = Session.AUTO_ACKNOWLEDGE;
private String consumerName = "James";
private long sleepTime;
private long receiveTimeOut;
private long batch = 10; // Default batch size for CLIENT_ACKNOWLEDGEMENT or SESSION_TRANSACTED
private long messagesReceived = 0;
public static void main(String[] args) {
ArrayList<ConsumerTool> threads = new ArrayList();
ConsumerTool consumerTool = new ConsumerTool();
String[] unknown = CommandLineSupport.setOptions(consumerTool, args);
if (unknown.length > 0) {
System.out.println("Unknown options: " + Arrays.toString(unknown));
System.exit(-1);
}
consumerTool.showParameters();
for (int threadCount = 1; threadCount <= parallelThreads; threadCount++) {
consumerTool = new ConsumerTool();
CommandLineSupport.setOptions(consumerTool, args);
consumerTool.start();
threads.add(consumerTool);
}
while (true) {
Iterator<ConsumerTool> itr = threads.iterator();
int running = 0;
while (itr.hasNext()) {
ConsumerTool thread = itr.next();
if (thread.isAlive()) {
running++;
}
}
if (running <= 0) {
System.out.println("All threads completed their work");
break;
}
try {
Thread.sleep(1000);
} catch (Exception e) {
}
}
Iterator<ConsumerTool> itr = threads.iterator();
while (itr.hasNext()) {
ConsumerTool thread = itr.next();
}
}
public void showParameters() {
System.out.println("Connecting to URL: " + url + " (" + user + ":" + password + ")");
System.out.println("Consuming " + (topic ? "topic" : "queue") + ": " + subject);
System.out.println("Using a " + (durable ? "durable" : "non-durable") + " subscription");
System.out.println("Running " + parallelThreads + " parallel threads");
}
public void run() {
try {
running = true;
ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory(user, password, url);
Connection connection = connectionFactory.createConnection();
if (durable && clientId != null && clientId.length() > 0 && !"null".equals(clientId)) {
connection.setClientID(clientId);
}
connection.setExceptionListener(this);
connection.start();
session = connection.createSession(transacted, ackMode);
if (topic) {
destination = session.createTopic(subject);
} else {
destination = session.createQueue(subject);
}
replyProducer = session.createProducer(null);
replyProducer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);
MessageConsumer consumer = null;
if (durable && topic) {
consumer = session.createDurableSubscriber((Topic) destination, consumerName);
} else {
consumer = session.createConsumer(destination);
}
if (maxiumMessages > 0) {
consumeMessagesAndClose(connection, session, consumer);
} else {
if (receiveTimeOut == 0) {
consumer.setMessageListener(this);
} else {
consumeMessagesAndClose(connection, session, consumer, receiveTimeOut);
}
}
} catch (Exception e) {
System.out.println("[" + this.getName() + "] Caught: " + e);
e.printStackTrace();
}
}
public void onMessage(Message message) {
messagesReceived++;
try {
if (message instanceof TextMessage) {
TextMessage txtMsg = (TextMessage) message;
if (verbose) {
String msg = txtMsg.getText();
int length = msg.length();
if (length > 50) {
msg = msg.substring(0, 50) + "...";
}
System.out.println("[" + this.getName() + "] Received: '" + msg + "' (length " + length + ")");
}
} else {
if (verbose) {
System.out.println("[" + this.getName() + "] Received: '" + message + "'");
}
}
if (message.getJMSReplyTo() != null) {
replyProducer.send(message.getJMSReplyTo(), session.createTextMessage("Reply: " + message.getJMSMessageID()));
}
if (transacted) {
if ((messagesReceived % batch) == 0) {
System.out.println("Commiting transaction for last " + batch + " messages; messages so far = " + messagesReceived);
session.commit();
}
} else if (ackMode == Session.CLIENT_ACKNOWLEDGE) {
if ((messagesReceived % batch) == 0) {
System.out.println("Acknowledging last " + batch + " messages; messages so far = " + messagesReceived);
message.acknowledge();
}
}
} catch (JMSException e) {
System.out.println("[" + this.getName() + "] Caught: " + e);
e.printStackTrace();
} finally {
if (sleepTime > 0) {
try {
Thread.sleep(sleepTime);
} catch (InterruptedException e) {
}
}
}
}
public synchronized void onException(JMSException ex) {
System.out.println("[" + this.getName() + "] JMS Exception occured. Shutting down client.");
running = false;
}
synchronized boolean isRunning() {
return running;
}
protected void consumeMessagesAndClose(Connection connection, Session session, MessageConsumer consumer) throws JMSException,
IOException {
System.out.println("[" + this.getName() + "] We are about to wait until we consume: " + maxiumMessages
+ " message(s) then we will shutdown");
for (int i = 0; i < maxiumMessages && isRunning();) {
Message message = consumer.receive(1000);
if (message != null) {
i++;
onMessage(message);
}
}
System.out.println("[" + this.getName() + "] Closing connection");
consumer.close();
session.close();
connection.close();
if (pauseBeforeShutdown) {
System.out.println("[" + this.getName() + "] Press return to shut down");
System.in.read();
}
}
protected void consumeMessagesAndClose(Connection connection, Session session, MessageConsumer consumer, long timeout)
throws JMSException, IOException {
System.out.println("[" + this.getName() + "] We will consume messages while they continue to be delivered within: " + timeout
+ " ms, and then we will shutdown");
Message message;
while ((message = consumer.receive(timeout)) != null) {
onMessage(message);
}
System.out.println("[" + this.getName() + "] Closing connection");
consumer.close();
session.close();
connection.close();
if (pauseBeforeShutdown) {
System.out.println("[" + this.getName() + "] Press return to shut down");
System.in.read();
}
}
public void setAckMode(String ackMode) {
if ("CLIENT_ACKNOWLEDGE".equals(ackMode)) {
this.ackMode = Session.CLIENT_ACKNOWLEDGE;
}
if ("AUTO_ACKNOWLEDGE".equals(ackMode)) {
this.ackMode = Session.AUTO_ACKNOWLEDGE;
}
if ("DUPS_OK_ACKNOWLEDGE".equals(ackMode)) {
this.ackMode = Session.DUPS_OK_ACKNOWLEDGE;
}
if ("SESSION_TRANSACTED".equals(ackMode)) {
this.ackMode = Session.SESSION_TRANSACTED;
}
}
public void setClientId(String clientID) {
this.clientId = clientID;
}
public void setConsumerName(String consumerName) {
this.consumerName = consumerName;
}
public void setDurable(boolean durable) {
this.durable = durable;
}
public void setMaxiumMessages(int maxiumMessages) {
this.maxiumMessages = maxiumMessages;
}
public void setPauseBeforeShutdown(boolean pauseBeforeShutdown) {
this.pauseBeforeShutdown = pauseBeforeShutdown;
}
public void setPassword(String pwd) {
this.password = pwd;
}
public void setReceiveTimeOut(long receiveTimeOut) {
this.receiveTimeOut = receiveTimeOut;
}
public void setSleepTime(long sleepTime) {
this.sleepTime = sleepTime;
}
public void setSubject(String subject) {
this.subject = subject;
}
public void setParallelThreads(int parallelThreads) {
if (parallelThreads < 1) {
parallelThreads = 1;
}
this.parallelThreads = parallelThreads;
}
public void setTopic(boolean topic) {
this.topic = topic;
}
public void setQueue(boolean queue) {
this.topic = !queue;
}
public void setTransacted(boolean transacted) {
this.transacted = transacted;
}
public void setUrl(String url) {
this.url = url;
}
public void setUser(String user) {
this.user = user;
}
public void setVerbose(boolean verbose) {
this.verbose = verbose;
}
public void setBatch(long batch) {
this.batch = batch;
}
}