1 files changed, 182 insertions, 0 deletions
diff --git a/trunk/qpid/java/client/example/src/main/java/org/apache/qpid/example/subscriber/Subscriber.java b/trunk/qpid/java/client/example/src/main/java/org/apache/qpid/example/subscriber/Subscriber.java
new file mode 100644
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--- /dev/null
+++ b/trunk/qpid/java/client/example/src/main/java/org/apache/qpid/example/subscriber/Subscriber.java
@@ -0,0 +1,182 @@
+/*
+ * 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.qpid.example.subscriber;
+
+import org.apache.qpid.client.AMQConnectionFactory;
+
+import javax.jms.*;
+import javax.jms.Connection;
+import javax.jms.MessageConsumer;
+import javax.jms.Session;
+import javax.naming.InitialContext;
+
+import org.apache.qpid.example.shared.InitialContextHelper;
+import org.slf4j.LoggerFactory;
+import org.slf4j.Logger;
+
+/**
+ * Subscriber which consumes messages from a queue
+ */
+
+public class Subscriber
+{
+    private static final Logger _log = LoggerFactory.getLogger(Subscriber.class);
+
+    protected static Connection _connection;
+
+    protected static MessageConsumer _consumer;
+
+    protected static InitialContextHelper _contextHelper;
+
+    protected static AMQConnectionFactory _connectionFactory;
+
+    protected Destination _destination;
+
+    public Subscriber()
+    {
+        try
+        {
+            //get an initial context from default properties
+            _contextHelper = new InitialContextHelper(null);
+            InitialContext ctx = _contextHelper.getInitialContext();
+
+            //then create a connection using the AMQConnectionFactory
+            _connectionFactory = (AMQConnectionFactory) ctx.lookup("local");
+
+            //lookup queue from context
+            _destination = (Destination) ctx.lookup("MyQueue");
+
+        }
+        catch (Exception e)
+        {
+            e.printStackTrace();
+            _log.error("Exception", e);
+        }
+    }
+
+    /**
+     * Listener class that handles messages
+     */
+    public static class ExampleMessageListener implements MessageListener
+    {
+        private String _name;
+
+        public ExampleMessageListener(String name)
+        {
+            _name = name;
+        }
+
+        /**
+         * Listens for message callbacks, handles and then acknowledges them
+         * @param message - the message received
+         */
+        public void onMessage(javax.jms.Message message)
+        {
+            _log.info(_name + " got message '" + message + "'");
+
+            try
+            {
+                //NB: Handle your message appropriately for your application here
+                //do some stuff
+
+                _log.debug("Acknowledging recieved message");
+
+                //Now acknowledge the message to clear it from our queue
+                message.acknowledge();
+            }
+            catch(JMSException j)
+            {
+                _log.error("JMSException trying to acknowledge message receipt");
+                j.printStackTrace();
+            }
+            catch(Exception e)
+            {
+                _log.error("Unexpected exception trying to handle message");
+                e.printStackTrace();
+            }
+        }
+    }
+
+    /**
+     * Subscribes to example Queue and attaches listener
+     */
+    public void subscribe()
+    {
+        _log.info("Starting subscription ...");
+
+        try
+        {
+             _connection = _connectionFactory.createConnection();
+
+            //Non transactional session using client acknowledgement
+            Session session =  _connection.createSession(false, Session.CLIENT_ACKNOWLEDGE);
+
+            //Create a consumer with a destination of our queue which will use defaults for prefetch etc
+            _consumer = session.createConsumer(_destination);
+
+            //give the message listener a name of it's own
+            _consumer.setMessageListener(new ExampleMessageListener("MessageListener " + System.currentTimeMillis()));
+
+            _connection.start();
+        }
+        catch (Throwable t)
+        {
+            _log.error("Fatal error: " + t);
+            t.printStackTrace();
+        }
+
+        _log.info("Waiting for messages ...");
+
+        //wait for messages and sleep to survive failover
+        try
+        {
+            while(true)
+            {
+                Thread.sleep(Long.MAX_VALUE);
+            }
+        }
+        catch (Exception e)
+        {
+            _log.warn("Exception while Subscriber sleeping",e);
+        }
+    }
+
+    /**
+     * Stop consuming and close connection
+     */
+    public void stop()
+    {
+        try
+        {
+            _consumer.close();
+            _consumer = null;
+            _connection.stop();
+            _connection.close();
+        }
+        catch(JMSException j)
+        {
+            _log.error("JMSException trying to Subscriber.stop: " + j.getStackTrace());
+        }
+    }
+
+}
+
+
+
+