/**
* 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.hive.hcatalog.messaging.jms;
import org.apache.commons.lang.StringUtils;
import org.apache.hive.hcatalog.common.HCatConstants;
import org.apache.hive.hcatalog.messaging.HCatEventMessage;
import org.apache.hive.hcatalog.messaging.MessageFactory;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.TextMessage;
/**
* Helper Utility to assist consumers of HCat Messages in extracting
* message-content from JMS messages.
*/
public class MessagingUtils {
/**
* Method to return HCatEventMessage contained in the JMS message.
* @param message The JMS Message instance
* @return The contained HCatEventMessage
*/
public static HCatEventMessage getMessage(Message message) {
try {
String messageBody = ((TextMessage)message).getText();
String eventType = message.getStringProperty(HCatConstants.HCAT_EVENT);
String messageVersion = message.getStringProperty(HCatConstants.HCAT_MESSAGE_VERSION);
String messageFormat = message.getStringProperty(HCatConstants.HCAT_MESSAGE_FORMAT);
if (StringUtils.isEmpty(messageBody) || StringUtils.isEmpty(eventType))
throw new IllegalArgumentException("Could not extract HCatEventMessage. " +
"EventType and/or MessageBody is null/empty.");
return MessageFactory.getDeserializer(messageFormat, messageVersion).getHCatEventMessage(eventType, messageBody);
}
catch (JMSException exception) {
throw new IllegalArgumentException("Could not extract HCatEventMessage. ", exception);
}
}
// Prevent construction.
private MessagingUtils() {}
}