/**
* Redistribution and use of this software and associated documentation
* ("Software"), with or without modification, are permitted provided
* that the following conditions are met:
*
* 1. Redistributions of source code must retain copyright
* statements and notices. Redistributions must also contain a
* copy of this document.
*
* 2. Redistributions in binary form must reproduce the
* above copyright notice, this list of conditions and the
* following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* 3. The name "Exolab" must not be used to endorse or promote
* products derived from this Software without prior written
* permission of Exoffice Technologies. For written permission,
* please contact info@exolab.org.
*
* 4. Products derived from this Software may not be called "Exolab"
* nor may "Exolab" appear in their names without prior written
* permission of Exoffice Technologies. Exolab is a registered
* trademark of Exoffice Technologies.
*
* 5. Due credit should be given to the Exolab Project
* (http://www.exolab.org/).
*
* THIS SOFTWARE IS PROVIDED BY EXOFFICE TECHNOLOGIES AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
* NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* EXOFFICE TECHNOLOGIES OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Copyright 2000-2004 (C) Exoffice Technologies Inc. All Rights Reserved.
*
* $Id: MulticastCallerListener.java,v 1.2 2005/05/27 13:58:00 tanderson Exp $
*/
package org.exolab.jms.net.connector;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.exolab.jms.net.uri.InvalidURIException;
import org.exolab.jms.net.uri.URI;
import org.exolab.jms.net.uri.URIHelper;
/**
* A listener for {@link Caller} events, which asynchronously propagates events
* to one or more registered listeners.
*
* @author <a href="mailto:tma@netspace.net.au">Tim Anderson</a>
* @version $Revision: 1.2 $ $Date: 2005/05/27 13:58:00 $
*/
public class MulticastCallerListener implements CallerListener {
/**
* The listeners. A set of <code>List</code> instances, keyed on
* URI.
*/
private Map _listeners = Collections.synchronizedMap(new HashMap());
/**
* Helper for casts.
*/
private static final CallerListener[] EMPTY = new CallerListener[0];
/**
* Registers an event listener for caller events.
*
* @param uri the remote URI to listen for events on
* @param listener the event listener
* @throws InvalidURIException if <code>uri</code> is invalid
*/
public void addCallerListener(String uri, CallerListener listener)
throws InvalidURIException{
URI parsed = URIHelper.parse(uri);
parsed = URIHelper.convertHostToAddress(parsed);
List list = null;
synchronized (_listeners) {
list = (List) _listeners.get(parsed);
if (list == null) {
list = Collections.synchronizedList(new ArrayList());
_listeners.put(parsed, list);
}
}
list.add(listener);
}
/**
* Removes an event listener for caller events.
*
* @param uri the remote URI to remove the listener for
* @param listener the event listener to remove
* @throws InvalidURIException if <code>uri</code> is invalid
*/
public void removeCallerListener(String uri, CallerListener listener)
throws InvalidURIException {
URI parsed = URIHelper.parse(uri);
parsed = URIHelper.convertHostToAddress(parsed);
List list = null;
synchronized (_listeners) {
list = (List) _listeners.get(parsed);
if (list != null) {
list.remove(listener);
}
}
}
/**
* Notifies that a connection has been disconnected.
*
* @param caller the caller that was disconnected
*/
public void disconnected(Caller caller) {
CallerListener[] listeners = getListeners(caller.getRemoteURI());
for (int i = 0; i < listeners.length; ++i) {
listeners[i].disconnected(caller);
}
}
/**
* Returns the registered listeners for a given URI.
*
* @param uri the URI to return the registered listsners for
* @return the registered listeners
*/
private CallerListener[] getListeners(URI uri) {
CallerListener[] result = EMPTY;
List list = null;
synchronized (_listeners) {
list = (List) _listeners.get(uri);
if (list == null) {
list = (List) _listeners.get(uri);
}
}
if (list != null) {
result = (CallerListener[]) list.toArray(EMPTY);
}
return result;
}
}