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+/* SimpleSessionContext.java -- memory-only session store.
+ Copyright (C) 2006 Free Software Foundation, Inc.
+
+This file is a part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or (at
+your option) any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
+USA
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library. Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.javax.net.ssl.provider;
+
+import gnu.javax.net.ssl.AbstractSessionContext;
+import gnu.javax.net.ssl.Session;
+import gnu.javax.net.ssl.SessionStoreException;
+import gnu.javax.net.ssl.Session.ID;
+
+import java.util.Enumeration;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+
+/**
+ * A simple, non-persistent SessionContext.
+ *
+ * @author csm
+ */
+public final class SimpleSessionContext
+ extends AbstractSessionContext
+{
+ /**
+ * By default, sessions last for 5 minutes.
+ */
+ public static final int DEFAULT_TIMEOUT = 300;
+
+ private final HashMap<Session.ID, Session> store;
+ private int storeLimit;
+
+ public SimpleSessionContext()
+ {
+ super(DEFAULT_TIMEOUT);
+ storeLimit = 0;
+ store = new HashMap<Session.ID, Session>();
+ }
+
+ @Override
+ protected Session implGet(byte[] sessionId)
+ {
+ return store.get(new Session.ID(sessionId));
+ }
+
+ @Override
+ public void load(char[] password) throws SessionStoreException
+ {
+ // Not supported. Memory-only.
+ }
+
+ @Override
+ public void put(Session session)
+ {
+ if (storeLimit > 0 && store.size() >= storeLimit)
+ {
+ Session oldest = null;
+ for (Map.Entry<Session.ID, Session> e : store.entrySet())
+ {
+ Session s = e.getValue();
+ long stamp = s.getLastAccessedTime();
+ if (oldest == null || oldest.getLastAccessedTime() > stamp)
+ oldest = s;
+ }
+ store.remove(oldest.id());
+ }
+ store.put(session.id(), session);
+ }
+
+ @Override
+ public void remove(byte[] sessionId)
+ {
+ store.remove(new Session.ID(sessionId));
+ }
+
+ @Override
+ public void store(char[] password) throws SessionStoreException
+ {
+ // Not supported. Memory-only.
+ }
+
+ public Enumeration getIds()
+ {
+ return new Enumeration()
+ {
+ Iterator<Session.ID> it = store.keySet().iterator();
+
+ public boolean hasMoreElements()
+ {
+ return it.hasNext();
+ }
+
+ public Object nextElement()
+ {
+ return it.next().id();
+ }
+ };
+ }
+
+ public int getSessionCacheSize()
+ {
+ return storeLimit;
+ }
+
+ public void setSessionCacheSize(int size)
+ {
+ if (size < 0)
+ throw new IllegalArgumentException("cache size must be nonnegative");
+ this.storeLimit = size;
+ }
+
+}