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Java > Open Source Codes > org > apache > tapestry > engine > state > ApplicationStateManagerImpl


1 // Copyright 2005 The Apache Software Foundation
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 package org.apache.tapestry.engine.state;
16
17 import java.util.HashMap JavaDoc;
18 import java.util.Iterator JavaDoc;
19 import java.util.Map JavaDoc;
20
21 import org.apache.hivemind.PoolManageable;
22
23 /**
24  * This implementation expects to be pooled.
25  *
26  * @author Howard M. Lewis Ship
27  * @since 4.0
28  */
29 public class ApplicationStateManagerImpl implements ApplicationStateManager, PoolManageable
30 {
31
32     /**
33      * Keyed on application static object name, value is the current state object.
34      */
35
36     private Map JavaDoc _stateObjects = new HashMap JavaDoc();
37
38     private StateObjectManagerRegistry _registry;
39
40     public void activateService()
41     {
42     }
43
44     public void passivateService()
45     {
46         _stateObjects.clear();
47     }
48
49     public boolean exists(String JavaDoc objectName)
50     {
51         return _stateObjects.containsKey(objectName) || _registry.get(objectName).exists();
52     }
53
54     public Object JavaDoc get(String JavaDoc objectName)
55     {
56         Object JavaDoc result = _stateObjects.get(objectName);
57
58         if (result == null)
59         {
60             result = _registry.get(objectName).get();
61
62             _stateObjects.put(objectName, result);
63         }
64
65         return result;
66     }
67
68     public void store(String JavaDoc objectName, Object JavaDoc stateObject)
69     {
70         _registry.get(objectName).store(stateObject);
71
72         _stateObjects.put(objectName, stateObject);
73     }
74
75     public void flush()
76     {
77         Iterator JavaDoc i = _stateObjects.entrySet().iterator();
78         while (i.hasNext())
79         {
80             Map.Entry JavaDoc e = (Map.Entry JavaDoc) i.next();
81
82             String JavaDoc objectName = (String JavaDoc) e.getKey();
83             Object JavaDoc stateObject = e.getValue();
84
85             // Slight bending of law-of-demeter
86
87             _registry.get(objectName).store(stateObject);
88         }
89     }
90
91     public void setRegistry(StateObjectManagerRegistry registry)
92     {
93         _registry = registry;
94     }
95 }
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