/FileExtraction/Java_unseen/dlitz_resin/modules/resin/src/com/caucho/jms/queue/MessageCallback.java
/*
 * Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R) Open Source
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Resin Open Source is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */

package com.caucho.jms.queue;

/**
 * Listener for queue message available
 */
public interface MessageCallback<E>
{
  /**
   * Notifies a listener that a message is available from the queue.
   *
   * The message handler MUST use a different thread to retrieve the
   * message from the queue, i.e. the <code>notifyMessageAvailable</code>
   * implementation must spawn or wake a thread to handle the actual
   * message.
   * 
   * @return true if the consumer can handle the message
   */
  public void messageReceived(String msgId, E payload);
}

