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File org.dgpf.gp.netvm.fitness.MinimizeTransmissionPressure.java

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/*
 * Copyright (c) 2006 Thomas Weise
 *
 * E-Mail           : tweise@gmx.de
 * Creation Date    : 2006-07-08 11:53:00
 * Original Filename: org.dgpf.netvm.fitness.MinimizeTransmissionPressure.java
 * Version          : 1.0.0
 * Last modification: 2006-07-08
 *                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.gp.netvm.fitness;

import org.dgpf.gp.netvm.base.NetVMContext;
import org.dgpf.gp.netvm.instructions.Send;
import org.dgpf.gp.vm.base.Program;
import org.dgpf.gp.vm.instructions.ctrl.Push;
import org.dgpf.search.api.FitnessData;
import org.dgpf.search.api.FitnessFunction;
import org.dgpf.search.api.SearchContext;


/**
 * The transmission pressure fitness function is used to prevent programs
 * from using too much memory.
 *
 * @author Thomas Weise
 */

public class MinimizeTransmissionPressure extends FitnessFunction<Program,
                                                      FitnessData<Program>>
  {
/**
 * The globally shared instance of the transmission pressure fitness
 * function.
 */

  public  static  final FitnessFunction<Program, FitnessData<Program>>
    DEFAULT_INSTANCE = new MinimizeTransmissionPressure(5.0d);

/**
 * Create a new transmission pressure fitness function.
 * 
 * @param p_precision   The precision of this fitness function. This is the
 *                      count of levels to be used for the calculation.
 *                      If this parameter is <= 0.0d, the full precision
 *                      available will be used.
 */

  public  MinimizeTransmissionPressure(final double p_precision)
    {
    super(-1, p_precision);
    }

/**
 * This method is called when a simulation has come to an end.
 * You must use this method to store a fitness value into the fitness
 * record <code>p_fitness</code>. Use <code>set_fitness</code> for this.
 * @param p_fitness       The fitness data record that was used in this
 *                        simulation.
 * @param p_context       The context that has driven the simulation.
 * @see FitnessData#set_fitness(double)
 */

  @Override
  protected  final  void end_simulation(
                            final FitnessData<Program>    p_fitness,
                            final SearchContext<Program>  p_context)
    {
    NetVMContext l_c;
    double       l_d;
    long         l_l, l_l2;
    
    l_c  = ((NetVMContext)p_context);
        
    l_l  = l_c.get_delivered();
    l_l2 =  l_c.get_lost_at_receive() + l_l;
    
    if((l_l > 0L) && (l_l2 > 0L))
      {
      l_d  = (1.0d - (l_l / ((double)(l_l2))));
      
      l_l  = l_c.get_failed_sends();
      l_l <<= 3;
      l_l += l_c.get_successful_sends();
      l_l <<= 3;
      l_l += l_c.get_empty_sends();
      
      if(l_l <= 0) l_d = 0.0d;
      else         l_d = (1.0d / (l_d * l_l));
      }
    else
      {
      l_d  = 0.0d;
      }
    
    p_fitness.set_fitness(l_d) ; 
    }

/**
 * Perform a sanity check if there is any use in simulating this individual.
 * @param p_individual  The individual to be sanity-checked.
 * @return  <code>true</code> if and only if the individual shall be
 *          evaluated, <code>false</code> to abort evaluation of the
 *          individual because it is wack for some reason.
 */

  @Override
  protected  final  boolean should_simulate (final Program p_individual)
    {
    int l_i;
    
    if(p_individual.get_count(Push.class) < 1) return false;
    l_i = p_individual.get_count(Send.class);    
    return ((l_i >= 1) && super.should_simulate(p_individual));
    }
  
/**
 * Returns a human readable name of this fitness function.
 * @return A human readable name of this fitness function.
 */

  @Override
  public  final  String  toString  ()
    {
    return "transmission";
    }
  }

File Information:

file name:MinimizeTransmissionPressure.java
package:org.dgpf.gp.netvm.fitness
qualified name:org.dgpf.gp.netvm.fitness.MinimizeTransmissionPressure.java
file type:Java Source File
download location:download http://dgpf.sourceforge.net/source/org/dgpf/gp/netvm/fitness/MinimizeTransmissionPressure.java
size:4.532 KB (4641 B)
uploaded: 2015-07-22 04:10:56 GMT+0000
last update: 2006-08-22 14:21:47 GMT+0000
last access: 2017-11-22 19:15:16 GMT+0000

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