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 gnu.javax.net.ssl.Session.ID;
  45: 
  46: import java.util.Enumeration;
  47: import java.util.HashMap;
  48: import java.util.Iterator;
  49: import java.util.Map;
  50: 
  51: /**
  52:  * A simple, non-persistent SessionContext.
  53:  * 
  54:  * @author csm
  55:  */
  56: public final class SimpleSessionContext
  57:   extends AbstractSessionContext
  58: {
  59:   /**
  60:    * By default, sessions last for 5 minutes.
  61:    */
  62:   public static final int DEFAULT_TIMEOUT = 300;
  63:   
  64:   private final HashMap<Session.ID, Session> store;
  65:   private int storeLimit;
  66:   
  67:   public SimpleSessionContext()
  68:   {
  69:     super(DEFAULT_TIMEOUT);
  70:     storeLimit = 0;
  71:     store = new HashMap<Session.ID, Session>();
  72:   }
  73:   
  74:   @Override
  75:   protected Session implGet(byte[] sessionId)
  76:   {
  77:     return store.get(new Session.ID(sessionId));
  78:   }
  79: 
  80:   @Override
  81:   public void load(char[] password) throws SessionStoreException
  82:   {
  83:     // Not supported. Memory-only.
  84:   }
  85: 
  86:   @Override
  87:   public void put(Session session)
  88:   {
  89:     if (storeLimit > 0 && store.size() >= storeLimit)
  90:       {
  91:         Session oldest = null;
  92:         for (Map.Entry<Session.ID, Session> e : store.entrySet())
  93:           {
  94:             Session s = e.getValue();
  95:             long stamp = s.getLastAccessedTime();
  96:             if (oldest == null || oldest.getLastAccessedTime() > stamp)
  97:               oldest = s;
  98:           }
  99:         store.remove(oldest.id());
 100:       }
 101:     store.put(session.id(), session);
 102:   }
 103: 
 104:   @Override
 105:   public void remove(byte[] sessionId)
 106:   {
 107:     store.remove(new Session.ID(sessionId));
 108:   }
 109: 
 110:   @Override
 111:   public void store(char[] password) throws SessionStoreException
 112:   {
 113:     // Not supported. Memory-only.
 114:   }
 115: 
 116:   public Enumeration getIds()
 117:   {
 118:     return new Enumeration()
 119:     {
 120:       Iterator<Session.ID> it = store.keySet().iterator();
 121:       
 122:       public boolean hasMoreElements()
 123:       {
 124:         return it.hasNext();
 125:       }
 126:       
 127:       public Object nextElement()
 128:       {
 129:         return it.next().id();
 130:       }
 131:     };
 132:   }
 133: 
 134:   public int getSessionCacheSize()
 135:   {
 136:     return storeLimit;
 137:   }
 138: 
 139:   public void setSessionCacheSize(int size)
 140:   {
 141:     if (size < 0)
 142:       throw new IllegalArgumentException("cache size must be nonnegative");
 143:     this.storeLimit = size;
 144:   }
 145: 
 146: }