| /** |
| * 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. |
| */ |
| |
| /** |
| * The SimpleQueueReceiver class consists only of a main method, |
| * which fetches one or more messages from a queue using |
| * synchronous message delivery. Run this program in conjunction |
| * with SimpleQueueSender. Specify a queue name on the command |
| * line when you run the program. |
| */ |
| package org.apache.activemq.demo; |
| |
| import javax.jms.Connection; |
| import javax.jms.ConnectionFactory; |
| import javax.jms.Destination; |
| import javax.jms.JMSException; |
| import javax.jms.Message; |
| import javax.jms.MessageConsumer; |
| import javax.jms.Session; |
| import javax.jms.TextMessage; |
| import javax.naming.Context; |
| import javax.naming.InitialContext; |
| import javax.naming.NamingException; |
| |
| /** |
| * A simple polymorphic JMS consumer which can work with Queues or Topics which |
| * uses JNDI to lookup the JMS connection factory and destination |
| * |
| * |
| */ |
| public final class SimpleConsumer { |
| |
| private static final org.apache.commons.logging.Log LOG = org.apache.commons.logging.LogFactory |
| .getLog(SimpleConsumer.class); |
| |
| private SimpleConsumer() { |
| } |
| |
| /** |
| * @param args the queue used by the example |
| */ |
| public static void main(String[] args) { |
| String destinationName = null; |
| Context jndiContext = null; |
| ConnectionFactory connectionFactory = null; |
| Connection connection = null; |
| Session session = null; |
| Destination destination = null; |
| MessageConsumer consumer = null; |
| |
| /* |
| * Read destination name from command line and display it. |
| */ |
| if (args.length != 1) { |
| LOG.info("Usage: java SimpleConsumer <destination-name>"); |
| System.exit(1); |
| } |
| destinationName = args[0]; |
| LOG.info("Destination name is " + destinationName); |
| |
| /* |
| * Create a JNDI API InitialContext object |
| */ |
| try { |
| jndiContext = new InitialContext(); |
| } catch (NamingException e) { |
| LOG.info("Could not create JNDI API " + "context: " + e.toString()); |
| System.exit(1); |
| } |
| |
| /* |
| * Look up connection factory and destination. |
| */ |
| try { |
| connectionFactory = (ConnectionFactory)jndiContext.lookup("ConnectionFactory"); |
| destination = (Destination)jndiContext.lookup(destinationName); |
| } catch (NamingException e) { |
| LOG.info("JNDI API lookup failed: " + e.toString()); |
| System.exit(1); |
| } |
| |
| /* |
| * Create connection. Create session from connection; false means |
| * session is not transacted. Create receiver, then start message |
| * delivery. Receive all text messages from destination until a non-text |
| * message is received indicating end of message stream. Close |
| * connection. |
| */ |
| try { |
| connection = connectionFactory.createConnection(); |
| session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE); |
| consumer = session.createConsumer(destination); |
| connection.start(); |
| while (true) { |
| Message m = consumer.receive(1); |
| if (m != null) { |
| if (m instanceof TextMessage) { |
| TextMessage message = (TextMessage)m; |
| LOG.info("Reading message: " + message.getText()); |
| } else { |
| break; |
| } |
| } |
| } |
| } catch (JMSException e) { |
| LOG.info("Exception occurred: " + e); |
| } finally { |
| if (connection != null) { |
| try { |
| connection.close(); |
| } catch (JMSException e) { |
| } |
| } |
| } |
| } |
| } |