/**********************************************************************************
* $URL: https://source.sakaiproject.org/svn/chat/trunk/chat-api/api/src/java/org/sakaiproject/chat2/model/PresenceObserver.java $
* $Id: PresenceObserver.java 105079 2012-02-24 23:08:11Z ottenhoff@longsight.com $
***********************************************************************************
*
* Copyright (c) 2007, 2008 The Sakai Foundation
*
* Licensed under the Educational Community 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.opensource.org/licenses/ECL-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 org.sakaiproject.chat2.model;
/**
* any class that wants to observer users joining and leaving a location should
* implement this class and then open a new PresenceObserverHelper(this, "location")
* @author andersjb
*
*/
public interface PresenceObserver {
/**
* This is called by the PresenceObserverHelper when a user joins a location
* @param location the user is joining this location
* @param user the user joining
*/
public void userJoined(String location, String user);
/**
* This is called by the PresenceObserverHelper when a user leaves a location
* @param location the user is leaving this location
* @param user the user leaving
*/
public void userLeft(String location, String user);
}