1 files changed, 175 insertions, 0 deletions
diff --git a/sandbox/old/contrib/discovery-jms/src/main/java/org/apache/tuscany/service/discovery/jms/JmsDiscoveryService.java b/sandbox/old/contrib/discovery-jms/src/main/java/org/apache/tuscany/service/discovery/jms/JmsDiscoveryService.java
new file mode 100644
index 0000000000..518d482245
--- /dev/null
+++ b/sandbox/old/contrib/discovery-jms/src/main/java/org/apache/tuscany/service/discovery/jms/JmsDiscoveryService.java
@@ -0,0 +1,175 @@
+/*
+ * 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.tuscany.service.discovery.jms;
+
+import javax.jms.Connection;
+import javax.jms.ConnectionFactory;
+import javax.jms.ExceptionListener;
+import javax.jms.JMSException;
+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 javax.xml.stream.XMLStreamException;
+import javax.xml.stream.XMLStreamReader;
+
+import org.apache.activemq.ActiveMQConnection;
+import org.apache.activemq.ActiveMQConnectionFactory;
+import org.apache.activemq.command.ActiveMQTopic;
+import org.apache.tuscany.spi.services.discovery.AbstractDiscoveryService;
+import org.apache.tuscany.spi.services.discovery.DiscoveryException;
+import org.apache.tuscany.spi.util.stax.StaxUtil;
+import org.osoa.sca.annotations.Property;
+
+/**
+ * JMS based implementation of the discovery service. This class uses 
+ * ActiveMQ specific API instead of JNDI based administered objects. This can 
+ * be changed later if required.
+ * 
+ * @version $Revision$ $Date$
+ */
+public class JmsDiscoveryService extends AbstractDiscoveryService {
+
+    // Connection factory
+    private ConnectionFactory connectionFactory;
+
+    // Underlying JMS connection
+    private Connection connection;
+
+    // Session used for reception
+    private Session receiverSession;
+
+    // Message consumer
+    private MessageConsumer messageConsumer;
+
+    // Topic to use
+    private Topic topic;
+    
+    // String broker url
+    private String brokerUrl = ActiveMQConnection.DEFAULT_BROKER_URL;
+
+    /**
+     * Injects the topic used for communication.
+     * @param topic Topic used for communication.
+     */
+    @Property
+    public void setTopic(String topic) {
+        this.topic = new ActiveMQTopic(topic);
+    }
+
+    /**
+     * Injects the broker URL.
+     * @param brokerUrl Broker URL to use.
+     */
+    @Property
+    public void setBrokerUrl(String brokerUrl) {
+        this.brokerUrl = brokerUrl;
+    }
+
+    /**
+     * Starts the service and sets up the message listener.
+     */
+    @Override
+    protected synchronized void onStart() throws DiscoveryException {
+
+        String runtimeId = getRuntimeInfo().getRuntimeId();
+
+        try {
+            
+            connectionFactory = new ActiveMQConnectionFactory(brokerUrl);
+
+            connection = connectionFactory.createConnection();
+            connection.setExceptionListener(new ExceptionListener() {
+                public void onException(JMSException jmsException) {
+                    // Try restarting: TODO this may need further refinement
+                    try {
+                        onStop();
+                    } catch (DiscoveryException ex) {
+                        ex.printStackTrace();
+                    }
+                    try {
+                        onStart();
+                    } catch (DiscoveryException ex) {
+                        ex.printStackTrace();
+                    }
+                }                
+            });
+            receiverSession = connection.createSession(true, Session.AUTO_ACKNOWLEDGE);
+
+            messageConsumer = receiverSession.createConsumer(topic);
+            final MessageListener messageListener = new TuscanyMessageListener(this, runtimeId);
+            messageConsumer.setMessageListener(messageListener);
+            connection.start();
+
+        } catch (JMSException ex) {
+            throw new DiscoveryException(ex);
+        }
+
+    }
+
+    /**
+     * Closes the connection.
+     */
+    @Override
+    protected synchronized void onStop() throws DiscoveryException {
+
+        try {
+            receiverSession.close();
+        } catch (JMSException ex) {
+            throw new DiscoveryException(ex);
+        } finally {
+            try {
+                connection.close();                
+            } catch (JMSException ex) {
+                throw new DiscoveryException(ex);
+            }
+        }
+        
+    }
+
+    /**
+     * Sends the message.
+     */
+    public synchronized int sendMessage(String runtimeId, XMLStreamReader reader) throws DiscoveryException {
+
+        try {
+
+            String text = StaxUtil.serialize(reader);
+            Session senderSession = connection.createSession(true, Session.AUTO_ACKNOWLEDGE);
+            MessageProducer messageProducer = senderSession.createProducer(topic);
+
+            TextMessage textMessage = senderSession.createTextMessage(text);
+            
+            textMessage.setStringProperty("runtimeId", runtimeId);
+            messageProducer.send(textMessage);
+            senderSession.commit();
+            senderSession.close();
+
+            return 1;
+
+        } catch (XMLStreamException ex) {
+            throw new DiscoveryException(ex);
+        } catch (JMSException ex) {
+            throw new DiscoveryException(ex);
+        }
+    }
+
+}