SimpleSession


1   /*
2    * Copyright 2001-2004 The Apache Software Foundation.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    * 
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.apache.axis.session;
18  
19  import java.util.Enumeration  ;
20  import java.util.Hashtable  ;
21  
22  /**
23   * A trivial session implementation.
24   *
25   * @author Glen Daniels (gdaniels@apache.org)
26   */
27  public class SimpleSession implements Session
28  {
29      private Hashtable   rep = null;
30      
31      /** Inactivity timeout (in seconds).
32       * Not used yet.
33       */
34      private int timeout = -1;
35      private long lastTouched;
36      
37      /**
38       * Default constructor - set lastTouched to now
39       */ 
40      public SimpleSession()
41      {
42          lastTouched = System.currentTimeMillis();
43      }
44                            
45      /** Get a property from the session
46       *
47       * @param key the name of the property desired.
48       */
49      public Object   get(String   key)
50      {
51          if (rep == null)
52              return null;
53          lastTouched = System.currentTimeMillis();
54          return rep.get(key);
55      }
56      
57      /** Set a property in the session
58       *
59       * @param key the name of the property to set.
60       * @param value the value of the property.
61       */
62      public void set(String   key, Object   value)
63      {
64          synchronized (this) {
65              if (rep == null)
66                  rep = new Hashtable  ();
67          }
68          lastTouched = System.currentTimeMillis();
69          rep.put(key, value);
70      }
71      
72      /** Remove a property from the session
73       *
74       * @param key the name of the property desired.
75       */
76      public void remove(String   key)
77      {
78          if (rep != null)
79              rep.remove(key);
80          lastTouched = System.currentTimeMillis();
81      }
82  
83      /**
84       * Get an enumeration of the keys in this session
85       */
86      public Enumeration   getKeys() {
87          if (rep != null)
88              return rep.keys();
89          return null;
90      }
91  
92      /** Set the session's time-to-live.
93       *
94       * This is implementation-specific, but basically should be the #
95       * of seconds of inactivity which will cause the session to time
96       * out and invalidate.  "inactivity" is implementation-specific.
97       */
98      public void setTimeout(int timeout)
99      {
100         this.timeout = timeout;
101     }
102     
103     public int getTimeout()
104     {
105         return timeout;
106     }
107 
108     /**
109      * "Touch" the session (mark it recently used)
110      */
111     public void touch() {
112         lastTouched = System.currentTimeMillis();
113     }
114 
115     /**
116      * invalidate the session
117      */
118     public void invalidate() {
119         rep = null;
120         lastTouched = System.currentTimeMillis();
121         timeout = -1;        
122     }
123     
124     public long getLastAccessTime()
125     {
126         return lastTouched;
127     }
128 
129     /**
130      * Get an Object suitable for synchronizing the session.  This method
131      * exists because different session implementations might provide
132      * different ways of getting at shared data.  For a simple hashtable-
133      * based session, this would just be the hashtable, but for sessions
134      * which use database connections, etc. it might be an object wrapping
135      * a table ID or somesuch.
136      */
137     public synchronized Object   getLockObject() {
138         if (rep == null) {
139             rep = new Hashtable  ();
140         }
141         return rep;
142     }
143 }
144
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