1 /*** 2 * 3 * Copyright 2004 Protique Ltd 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 **/ 18 package org.codehaus.activecluster.impl; 19 20 import org.apache.commons.logging.Log; 21 import org.apache.commons.logging.LogFactory; 22 import org.codehaus.activecluster.Node; 23 24 import javax.jms.Message; 25 import javax.jms.MessageListener; 26 import javax.jms.ObjectMessage; 27 28 29 /*** 30 * A JMS MessageListener which processes inbound messages and 31 * applies them to a StateService 32 * 33 * @version $Revision: 1.3 $ 34 */ 35 public class StateConsumer implements MessageListener { 36 37 private final static Log log = LogFactory.getLog(StateConsumer.class); 38 39 private StateService stateService; 40 41 public StateConsumer(StateService stateService) { 42 if (stateService == null) { 43 throw new IllegalArgumentException("Must specify a valid StateService implementation"); 44 } 45 this.stateService = stateService; 46 } 47 48 public void onMessage(Message message) { 49 if (log.isDebugEnabled()) { 50 log.debug("Received cluster data message!: " + message); 51 } 52 53 if (message instanceof ObjectMessage) { 54 ObjectMessage objectMessage = (ObjectMessage) message; 55 try { 56 Node node = (Node) objectMessage.getObject(); 57 String type = objectMessage.getJMSType(); 58 if (type != null && type.equals("shutdown")) { 59 stateService.shutdown(node); 60 } 61 else { 62 stateService.keepAlive(node); 63 } 64 } 65 catch (Exception e) { 66 log.error("Could not extract node from message: " + e + ". Message: " + message, e); 67 } 68 } 69 else { 70 log.warn("Ignoring message: " + message); 71 } 72 } 73 }