/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2006, Red Hat Middleware LLC, and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.jboss.ha.hasessionstate.server;

import org.jboss.ha.hasessionstate.interfaces.PackagedSession;

import java.io.IOException;
import java.io.Serializable;

/**
 *   Default implementation of PackagedSession
 *
 *   @see PackagedSession, HASessionStateImpl
 *   @author sacha.labourey@cogito-info.ch
 *   @version $Revision: 57188 $
 */
public class PackagedSessionImpl implements PackagedSession
{
   /** The serialVersionUID
    * @since 1.1.4.1
    */ 
   private static final long serialVersionUID = 4162160242862877223L;

   protected byte[] state;
   protected long versionId;
   protected String owner;
   protected Serializable key;
   protected transient long lastModificationTimeInVM;
   
   public PackagedSessionImpl () 
   {
      this.lastModificationTimeInVM = System.currentTimeMillis ();
   }
   
   public PackagedSessionImpl (Serializable key, byte[] state, String owner)
   {
      this.key = key;
      this.setState (state);
      this.owner = owner;
      this.lastModificationTimeInVM = System.currentTimeMillis ();
   }
   
   public byte[] getState ()
   {
      return this.state;
   }
   
   public boolean setState (byte[] state)
   {
      this.lastModificationTimeInVM = System.currentTimeMillis ();
      if (isStateIdentical (state))
         return true;
      else
      {
         this.state = state;
         this.versionId++;
         return false;
      }
   }
   
   public boolean isStateIdentical (byte[] state)
   {
      return java.util.Arrays.equals (state, this.state);
   }
   
   public void update (PackagedSession clone)
   {
      this.state = (byte[])clone.getState().clone();
      this.versionId = clone.getVersion ();
      this.owner = clone.getOwner ();    
      this.lastModificationTimeInVM = System.currentTimeMillis();
   }
   
   public String getOwner ()
   { return this.owner; }
   public void setOwner (String owner)
   { this.owner = owner; }
   
   public long getVersion ()
   { return this.versionId; }
   
   public Serializable getKey ()
   { return this.key; }
   public void setKey (Serializable key)
   { this.key = key; }

   public long unmodifiedExistenceInVM ()
   {
      return this.lastModificationTimeInVM;
   }
   
   // JBAS-3545 -- have to set the mod time after deserializing
   private void readObject(java.io.ObjectInputStream in)
         throws IOException, ClassNotFoundException
   {
      in.defaultReadObject();
      this.lastModificationTimeInVM = System.currentTimeMillis();
   }
}