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/*
 * Copyright (c) 2006 Thomas Weise
 * 
 * E-Mail           : tweise@gmx.de
 * Creation Date    : 2006-04-26 06:11:26
 * Original Filename: org.dgpf.search.api.p2p.adaptation.DefaultP2PAdapter.java
 * Version          : 2.0.0
 * Last modification: 2006-05-08
 *                by: Thomas Weise
 * 
 * License          : GNU LESSER GENERAL PUBLIC LICENSE
 *                    Version 2.1, February 1999
 *                    You should have received a copy of this license along
 *                    with this library; if not, write to the Free Software
 *                    Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *                    MA 02111-1307, USA or download the license under
 *                    http://www.gnu.org/copyleft/lesser.html.
 *                    
 * Warranty         : This software is provided "as is" 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.
 */

 
package org.dgpf.search.api.p2p.adaptation;

import org.dgpf.search.api.SearchState;
import org.dgpf.search.api.p2p.P2PAdaptationStrategy;
import org.dgpf.search.api.p2p.P2PParameters;
import org.dgpf.search.api.p2p.P2PState;
import org.dgpf.search.api.p2p.StatefulP2PAdaptationStrategy;

/**
 * This is the default peer-to-peer adaptation strategy
 *
 * @author Thomas Weise
 */

public class DefaultP2PAdapter  extends StatefulP2PAdaptationStrategy
  {
/**
 * The serial version uid.
 */

  private static final long serialVersionUID            = 1;


/**
 * Create a new stateful adaptation strategy for p2p parameters.
 * @param p_parameters  The peer-to-peer parameters to be adapted.
 */

  public  DefaultP2PAdapter(final P2PParameters p_parameters)
    {
    super(p_parameters);
    }
  
/**
 * Initialize the peer-to-peer parameters if needed.
 * @param p_parameters  The parameter set to initialize.
 */

  @Override
  protected void  init(final P2PParameters p_parameters)
    {
    super.init(p_parameters);
    p_parameters.set_immigration_by_level(true);
    }
  
/**
 * Create a new stateful adaptation strategy for p2p parameters.
 * @param p_parameters  The peer-to-peer parameters to be adapted.
 * @param p_strategy  A prototype to copy the internal data from.
 */

  public  DefaultP2PAdapter(
                  final P2PParameters         p_parameters,
                  final P2PAdaptationStrategy p_strategy)
    {
    super(p_parameters, p_strategy);
    }
  

/**
 * This method will be called by the search engine whenever it feels like
 * it is time to adapt the current search parameters to the current search
 * state. If you override this method, you must also declare your class
 * as instance of <code>ICloneable</code>.
 * @param p_state     The current state of the search.
 * @param p_p2p_state The peer-to-peer state.
 * @return  <code>true</code> if and only if the update level should be
 *          resetted, <code>false</code> if everything should continue
 *          normal.
 */

 @Override
  public  boolean  adapt (final SearchState<?> p_state,
                          final P2PState       p_p2p_state)
    {
    P2PParameters l_gp;
    int           l_i;
    double        l_d;

    l_gp = this.get_parameters();

    if(p_state.get_improvement() > 0)
      {
      for(l_i = (p_state.get_fitness_function_count()-1); l_i >= 0; l_i--)
        {
        l_gp.set_immigration_threshold(l_i, Double.POSITIVE_INFINITY);
        }
      }
    else
      {
      if( (p_state.get_rel_improvement() > 0) &&
          (p_state.get_update_level() < p_state.get_update_count()) )
        {
        for(l_i = (p_state.get_fitness_function_count()-1); l_i >= 0; l_i--)
          {
          l_d = p_state.get_rel_best().get_fitness(l_i) * 0.975d;
          if(l_d > l_gp.get_immigration_threshold(l_i))
            {
            l_gp.set_immigration_threshold(l_i, l_d);
            }
          }
        }
      }

    return false;
    }
  
/**
 * This method will be called whenever the search parameters perform a
 * reset, meaning that the search level is set back to 0.
 */

 @Override
  public void  reset ()
    {    
    P2PParameters l_gp;
    int           l_i;
    
    l_gp = this.get_parameters();   
    
    for(l_i = (l_gp.get_fitness_function_count()-1); l_i >= 0; l_i--)
      {
      l_gp.set_immigration_threshold(l_i, 0.0d);
      }
    
    super.reset();
    }
  }

File Information:

file name:DefaultP2PAdapter.java
package:org.dgpf.search.api.p2p.adaptation
qualified name:org.dgpf.search.api.p2p.adaptation.DefaultP2PAdapter.java
file type:Java Source File
download location:download http://dgpf.sourceforge.net/source/org/dgpf/search/api/p2p/adaptation/DefaultP2PAdapter.java
size:4.566 KB (4676 B)
uploaded: 2015-07-22 04:11:00 GMT+0000
last update: 2006-05-08 13:45:36 GMT+0000
last access: 2017-11-17 19:29:22 GMT+0000

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