1 /* SimpleSessionContext.java -- memory-only session store.
2    Copyright (C) 2006  Free Software Foundation, Inc.
3 
4 This file is a part of GNU Classpath.
5 
6 GNU Classpath is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or (at
9 your option) any later version.
10 
11 GNU Classpath is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 General Public License for more details.
15 
16 You should have received a copy of the GNU General Public License
17 along with GNU Classpath; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
19 USA
20 
21 Linking this library statically or dynamically with other modules is
22 making a combined work based on this library.  Thus, the terms and
23 conditions of the GNU General Public License cover the whole
24 combination.
25 
26 As a special exception, the copyright holders of this library give you
27 permission to link this library with independent modules to produce an
28 executable, regardless of the license terms of these independent
29 modules, and to copy and distribute the resulting executable under
30 terms of your choice, provided that you also meet, for each linked
31 independent module, the terms and conditions of the license of that
32 module.  An independent module is a module which is not derived from
33 or based on this library.  If you modify this library, you may extend
34 this exception to your version of the library, but you are not
35 obligated to do so.  If you do not wish to do so, delete this
36 exception statement from your version.  */
37 
38 
39 package gnu.javax.net.ssl.provider;
40 
41 import gnu.javax.net.ssl.AbstractSessionContext;
42 import gnu.javax.net.ssl.Session;
43 import gnu.javax.net.ssl.SessionStoreException;
44 import java.util.Enumeration;
45 import java.util.HashMap;
46 import java.util.Iterator;
47 import java.util.Map;
48 
49 /**
50  * A simple, non-persistent SessionContext.
51  *
52  * @author csm
53  */
54 public final class SimpleSessionContext
55   extends AbstractSessionContext
56 {
57   /**
58    * By default, sessions last for 5 minutes.
59    */
60   public static final int DEFAULT_TIMEOUT = 300;
61 
62   private final HashMap<Session.ID, Session> store;
63   private int storeLimit;
64 
SimpleSessionContext()65   public SimpleSessionContext()
66   {
67     super(DEFAULT_TIMEOUT);
68     storeLimit = 0;
69     store = new HashMap<Session.ID, Session>();
70   }
71 
72   @Override
implGet(byte[] sessionId)73   protected Session implGet(byte[] sessionId)
74   {
75     return store.get(new Session.ID(sessionId));
76   }
77 
78   @Override
load(char[] password)79   public void load(char[] password) throws SessionStoreException
80   {
81     // Not supported. Memory-only.
82   }
83 
84   @Override
put(Session session)85   public void put(Session session)
86   {
87     if (storeLimit > 0 && store.size() >= storeLimit)
88       {
89         Session oldest = null;
90         for (Map.Entry<Session.ID, Session> e : store.entrySet())
91           {
92             Session s = e.getValue();
93             long stamp = s.getLastAccessedTime();
94             if (oldest == null || oldest.getLastAccessedTime() > stamp)
95               oldest = s;
96           }
97         store.remove(oldest.id());
98       }
99     store.put(session.id(), session);
100   }
101 
102   @Override
remove(byte[] sessionId)103   public void remove(byte[] sessionId)
104   {
105     store.remove(new Session.ID(sessionId));
106   }
107 
108   @Override
store(char[] password)109   public void store(char[] password) throws SessionStoreException
110   {
111     // Not supported. Memory-only.
112   }
113 
getIds()114   public Enumeration getIds()
115   {
116     return new Enumeration()
117     {
118       Iterator<Session.ID> it = store.keySet().iterator();
119 
120       public boolean hasMoreElements()
121       {
122         return it.hasNext();
123       }
124 
125       public Object nextElement()
126       {
127         return it.next().id();
128       }
129     };
130   }
131 
getSessionCacheSize()132   public int getSessionCacheSize()
133   {
134     return storeLimit;
135   }
136 
setSessionCacheSize(int size)137   public void setSessionCacheSize(int size)
138   {
139     if (size < 0)
140       throw new IllegalArgumentException("cache size must be nonnegative");
141     this.storeLimit = size;
142   }
143 
144 }
145