Source for gnu.javax.net.ssl.provider.SimpleSessionContext

   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: 
  65:   public SimpleSessionContext()
  66:   {
  67:     super(DEFAULT_TIMEOUT);
  68:     storeLimit = 0;
  69:     store = new HashMap<Session.ID, Session>();
  70:   }
  71: 
  72:   @Override
  73:   protected Session implGet(byte[] sessionId)
  74:   {
  75:     return store.get(new Session.ID(sessionId));
  76:   }
  77: 
  78:   @Override
  79:   public void load(char[] password) throws SessionStoreException
  80:   {
  81:     // Not supported. Memory-only.
  82:   }
  83: 
  84:   @Override
  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
 103:   public void remove(byte[] sessionId)
 104:   {
 105:     store.remove(new Session.ID(sessionId));
 106:   }
 107: 
 108:   @Override
 109:   public void store(char[] password) throws SessionStoreException
 110:   {
 111:     // Not supported. Memory-only.
 112:   }
 113: 
 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: 
 132:   public int getSessionCacheSize()
 133:   {
 134:     return storeLimit;
 135:   }
 136: 
 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: }