001    // Copyright 2005 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.tapestry.engine.state;
016    
017    import java.util.HashMap;
018    import java.util.Map;
019    
020    /**
021     * The application scope is for objects that are global to all users and all sessions.
022     * Traditionally, that's stored in the servlet context, but there's no advantage to doing that over
023     * just using a Map.
024     * 
025     * @author Howard M. Lewis Ship
026     * @since 4.0
027     */
028    public class ApplicationScopeManager implements StateObjectPersistenceManager
029    {
030        private Map _objects = new HashMap();
031    
032        public synchronized boolean exists(String objectName)
033        {
034            return false;
035        }
036    
037        public synchronized Object get(String objectName, StateObjectFactory factory)
038        {
039            Object result = _objects.get(objectName);
040    
041            if (result == null)
042            {
043                result = factory.createStateObject();
044                _objects.put(objectName, result);
045            }
046    
047            return result;
048        }
049    
050        public synchronized void store(String objectName, Object stateObject)
051        {
052            _objects.put(objectName, stateObject);
053        }
054    
055    }