| /** |
| * |
| * 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.openejb.core.mdb; |
| |
| import javax.jms.Connection; |
| import javax.jms.ConnectionFactory; |
| import javax.jms.JMSException; |
| import javax.jms.Message; |
| import javax.jms.MessageListener; |
| import javax.jms.MessageProducer; |
| import javax.jms.ObjectMessage; |
| import javax.jms.Session; |
| import java.io.Serializable; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| import java.util.Map; |
| import java.util.TreeMap; |
| |
| public class MdbInvoker implements MessageListener { |
| private final Map<String, Method> signatures = new TreeMap<String, Method>(); |
| private final Object target; |
| private Connection connection; |
| private Session session; |
| private ConnectionFactory connectionFactory; |
| |
| public MdbInvoker(ConnectionFactory connectionFactory, Object target) throws JMSException { |
| this.target = target; |
| this.connectionFactory = connectionFactory; |
| for (Method method : target.getClass().getMethods()) { |
| String signature = MdbUtil.getSignature(method); |
| signatures.put(signature, method); |
| } |
| } |
| |
| public synchronized void destroy() { |
| MdbUtil.close(session); |
| session = null; |
| MdbUtil.close(connection); |
| connection = null; |
| } |
| |
| private synchronized Session getSession() throws JMSException { |
| connection = connectionFactory.createConnection(); |
| connection.start(); |
| session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE); |
| return session; |
| } |
| |
| public void onMessage(Message message) { |
| if (!(message instanceof ObjectMessage)) return; |
| |
| try { |
| Session session = getSession(); |
| if (session == null) throw new IllegalStateException("Invoker has been destroyed"); |
| |
| if (message == null) throw new NullPointerException("request message is null"); |
| if (!(message instanceof ObjectMessage)) throw new IllegalArgumentException("Expected a ObjectMessage request but got a " + message.getClass().getName()); |
| ObjectMessage objectMessage = (ObjectMessage) message; |
| Serializable object = objectMessage.getObject(); |
| if (object == null) throw new NullPointerException("object in ObjectMessage is null"); |
| if (!(object instanceof Map)) { |
| if (message instanceof ObjectMessage) throw new IllegalArgumentException("Expected a Map contained in the ObjectMessage request but got a " + object.getClass().getName()); |
| } |
| Map request = (Map) object; |
| |
| String signature = (String) request.get("method"); |
| Method method = signatures.get(signature); |
| Object[] args = (Object[]) request.get("args"); |
| |
| boolean exception = false; |
| Object result = null; |
| try { |
| result = method.invoke(target, args); |
| } catch (IllegalAccessException e) { |
| result = e; |
| exception = true; |
| } catch (InvocationTargetException e) { |
| result = e.getCause(); |
| if (result == null) result = e; |
| exception = true; |
| } |
| |
| MessageProducer producer = null; |
| try { |
| // create response |
| Map<String, Object> response = new TreeMap<String, Object>(); |
| if (exception) { |
| response.put("exception", "true"); |
| } |
| response.put("return", result); |
| |
| // create response message |
| ObjectMessage resMessage = session.createObjectMessage(); |
| resMessage.setJMSCorrelationID(objectMessage.getJMSCorrelationID()); |
| resMessage.setObject((Serializable) response); |
| |
| // send response message |
| producer = session.createProducer(objectMessage.getJMSReplyTo()); |
| producer.send(resMessage); |
| } catch (Exception e) { |
| e.printStackTrace(); |
| } finally { |
| MdbUtil.close(producer); |
| destroy(); |
| } |
| } catch (Throwable e) { |
| e.printStackTrace(); |
| } |
| } |
| } |