001 /*
002 * Copyright 2005-2006 Stephen J. McConnell.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
013 * implied.
014 *
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018
019 package net.dpml.metro.runtime;
020
021 import java.rmi.RemoteException;
022
023 import net.dpml.component.Disposable;
024
025 import net.dpml.util.EventQueue;
026 import net.dpml.util.Logger;
027
028 /**
029 * A abstract base class that established an event queue and handles event dispatch
030 * operations for listeners declared in a class extending this base class.
031 *
032 * @author <a href="http://www.dpml.net">Digital Product Meta Library</a>
033 * @version 1.0.2
034 */
035 public abstract class UnicastEventSource extends net.dpml.util.UnicastEventSource implements Disposable
036 {
037 private boolean m_disposed = false;
038
039 /**
040 * Creation of a new <tt>UnicastEventSource</tt>.
041 * @param queue the system event queue
042 * @param logger the assigned logging channel
043 * @exception RemoteException if a remote I/O exception occurs
044 */
045 protected UnicastEventSource( EventQueue queue, Logger logger ) throws RemoteException
046 {
047 super( queue, logger );
048 }
049
050 //--------------------------------------------------------------------------
051 // Disposable
052 //--------------------------------------------------------------------------
053
054 /**
055 * Retun the disposed state of this event source.
056 * @return true if disposed
057 */
058 protected boolean isDisposed()
059 {
060 return m_disposed;
061 }
062
063 /**
064 * Handle instance disposal.
065 */
066 public void dispose()
067 {
068 if( !m_disposed )
069 {
070 super.terminate();
071 m_disposed = true;
072 }
073 }
074
075 //--------------------------------------------------------------------------
076 // internal
077 //--------------------------------------------------------------------------
078
079 /**
080 * Return the logging channel assigned to the event source.
081 * @return the logging channel
082 */
083 Logger getLogger()
084 {
085 return super.getLocalLogger();
086 }
087 }