/*
 * IronJacamar, a Java EE Connector Architecture implementation
 * Copyright 2008-2009, Red Hat Inc, and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package javax.resource.spi.work;

import java.util.EventListener;

/**
 * This models a <code>WorkListener</code> instance which would be notified
 * by the <code>WorkManager</code> when the various <code>Work</code> 
 * processing events (work accepted, work rejected, work started, 
 * work completed) occur.
 *
 * The <code>WorkListener</code> instance must not make any thread 
 * assumptions and must be thread-safe ie., a notification could 
 * occur from any arbitrary thread. Further, it must not make any
 * assumptions on the ordering of notifications.
 *
 * @version 1.0
 * @author  Ram Jeyaraman
 */
public interface WorkListener extends EventListener 
{
   
   /** 
    * Invoked when a <code>Work</code> instance has been accepted.
    * @param e A <code>WorkEvent</code> object that provides more 
    * information about the accepted Work.
    */
   void workAccepted(WorkEvent e);
   
   /** 
    * Invoked when a <code>Work</code> instance has been rejected.
    * @param e A <code>WorkEvent</code> object that provides more 
    * information about the accepted Work.
    */
   void workRejected(WorkEvent e);
   
   /** 
    * Invoked when a <code>Work</code> instance has started execution.
    * This only means that a thread has been allocated.
    * @param e A <code>WorkEvent</code> object that provides more 
    * information about the accepted Work.
    */
   void workStarted(WorkEvent e);
   
   /** 
    * Invoked when a <code>Work</code> instance has completed execution.
    * @param e A <code>WorkEvent</code> object that provides more 
    * information about the accepted Work.
    */
   void workCompleted(WorkEvent e);
}
