library/src/main/java/com/datatorrent/lib/util/ActiveMQMultiTypeMessageListener.java

/*
 * Copyright (c) 2015 DataTorrent, Inc. ALL Rights Reserved.
 *
 * Licensed 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 com.datatorrent.lib.util;

import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import javax.jms.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @since 2.1.0
 */
public class ActiveMQMultiTypeMessageListener extends ActiveMQMessageListener
{
  @Override
  public void onMessage(Message message)
  {
    super.onMessage(message);
    if (message instanceof TextMessage) {
      TextMessage txtMsg = (TextMessage)message;
      String msg = null;
      try {
        msg = txtMsg.getText();
        receivedData.put(new Integer(countMessages), msg);
      }
      catch (JMSException ex) {
        logger.debug(ex.getLocalizedMessage());
      }

      logger.debug("Received a TextMessage: {}", msg);
    }
    else if (message instanceof MapMessage) {
      MapMessage mapMsg = (MapMessage)message;
      Map map = new HashMap();
      try {
        Enumeration en = mapMsg.getMapNames();
        while (en.hasMoreElements()) {
          String key = (String)en.nextElement();
          map.put(key, mapMsg.getObject(key));
        }
        receivedData.put(new Integer(countMessages), map);

      }
      catch (JMSException ex) {
        logger.debug(ex.getLocalizedMessage());
      }
      logger.debug("Received a MapMessage: {}", map);
    }
    else if (message instanceof BytesMessage) {
      BytesMessage bytesMsg = (BytesMessage)message;
      try {
        byte[] byteArr = new byte[(int)bytesMsg.getBodyLength()];
        bytesMsg.readBytes(byteArr);
        receivedData.put(new Integer(countMessages), byteArr);
      }
      catch (JMSException ex) {
        logger.debug(ex.getLocalizedMessage());
      }
      logger.debug("Received a ByteMessage: {}", bytesMsg);

    }
    else if (message instanceof ObjectMessage) {
      ObjectMessage objMsg = (ObjectMessage)message;
      Object msg = null;
      try {
        msg = objMsg.getObject();
        receivedData.put(new Integer(countMessages), msg);
      }
      catch (JMSException ex) {
        logger.debug(ex.getLocalizedMessage());
      }
      logger.debug("Received an ObjectMessage: {}", msg);
    }

    else {
      throw new IllegalArgumentException("Unhandled message type " + message.getClass().getName());
    }
  }

  private static final Logger logger = LoggerFactory.getLogger(ActiveMQMultiTypeMessageListener.class);

}