/*
* 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.brooklyn.demo;
import javax.jms.Connection;
import javax.jms.MessageConsumer;
import javax.jms.Queue;
import javax.jms.Session;
import javax.jms.TextMessage;
import org.apache.qpid.client.AMQConnectionFactory;
import org.apache.qpid.configuration.ClientProperties;
import com.google.common.base.Preconditions;
import com.google.common.base.Throwables;
/** Receives messages from a queue on a Qpid broker at a given URL. */
public class Subscribe {
public static final String QUEUE = "'amq.direct'/'testQueue'; { node: { type: queue } }";
private static final long MESSAGE_TIMEOUT_MILLIS = 15000L;
private static final int MESSAGE_COUNT = 100;
public static void main(String...argv) throws Exception {
Preconditions.checkElementIndex(0, argv.length, "Must specify broker URL");
String url = argv[0];
// Set Qpid client properties
System.setProperty(ClientProperties.AMQP_VERSION, "0-10");
System.setProperty(ClientProperties.DEST_SYNTAX, "ADDR");
// Connect to the broker
AMQConnectionFactory factory = new AMQConnectionFactory(url);
Connection connection = factory.createConnection();
connection.start();
Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
System.out.printf("Waiting up to %s milliseconds to receive %s messages\n", MESSAGE_TIMEOUT_MILLIS, MESSAGE_COUNT);
try {
// Create a producer for the queue
Queue destination = session.createQueue(QUEUE);
MessageConsumer messageConsumer = session.createConsumer(destination);
// Try and receive 100 messages
for (int n = 0; n < MESSAGE_COUNT; n++) {
TextMessage msg = (TextMessage) messageConsumer.receive(MESSAGE_TIMEOUT_MILLIS);
if (msg == null) {
System.out.printf("No message received in %s milliseconds, exiting", MESSAGE_TIMEOUT_MILLIS);
break;
}
System.out.printf("Got message %d: '%s'\n", n+1, msg.getText());
}
} catch (Exception e) {
System.err.printf("Error while receiving - %s\n", e.getMessage());
System.err.printf("Cause: %s\n", Throwables.getStackTraceAsString(e));
} finally {
session.close();
connection.close();
}
}
}