/**
* 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.oozie.client.event.jms;
import org.apache.oozie.client.event.Event.MessageType;
import org.apache.oozie.client.event.message.CoordinatorActionMessage;
import org.apache.oozie.client.event.message.EventMessage;
import org.apache.oozie.client.event.message.WorkflowJobMessage;
import org.apache.oozie.client.event.message.SLAMessage;
import org.apache.oozie.AppType;
import javax.jms.Message;
import javax.jms.TextMessage;
import javax.jms.JMSException;
/**
* Class to deserialize the jms message to java object
*/
public abstract class MessageDeserializer {
/**
* Constructs the event message from JMS message
*
* @param message the JMS message
* @return EventMessage
* @throws JMSException
*/
@SuppressWarnings("unchecked")
public <T extends EventMessage> T getEventMessage(Message message) throws JMSException {
TextMessage textMessage = (TextMessage) message;
String appTypeString = textMessage.getStringProperty(JMSHeaderConstants.APP_TYPE);
String msgType = textMessage.getStringProperty(JMSHeaderConstants.MESSAGE_TYPE);
String messageBody = textMessage.getText();
T eventMsg = null;
if (appTypeString == null || appTypeString.isEmpty() || messageBody == null || messageBody.isEmpty()) {
throw new IllegalArgumentException("Could not extract OozieEventMessage. "
+ "AppType and/or MessageBody is null/empty." + "Apptype is " + appTypeString + " MessageBody is "
+ messageBody);
}
if (MessageType.valueOf(msgType) == MessageType.JOB) {
switch (AppType.valueOf(appTypeString)) {
case WORKFLOW_JOB:
WorkflowJobMessage wfJobMsg = getDeserializedObject(messageBody, WorkflowJobMessage.class);
wfJobMsg.setProperties(textMessage);
eventMsg = (T) wfJobMsg;
break;
case COORDINATOR_ACTION:
CoordinatorActionMessage caActionMsg = getDeserializedObject(messageBody,
CoordinatorActionMessage.class);
caActionMsg.setProperties(textMessage);
eventMsg = (T) caActionMsg;
break;
default:
throw new UnsupportedOperationException("Conversion of " + appTypeString
+ " to Event message is not supported");
}
}
else if (MessageType.valueOf(msgType) == MessageType.SLA) {
SLAMessage SLAMsg = getDeserializedObject(messageBody, SLAMessage.class);
SLAMsg.setProperties(textMessage);
eventMsg = (T) SLAMsg;
}
return eventMsg;
}
protected abstract <T> T getDeserializedObject(String s, Class<T> clazz);
}