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
015package org.apache.tapestry.engine.state;
016
017import java.util.HashMap;
018import 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 */
028public 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}