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File org.dgpf.search.algorithms.ga.local.LocalGeneticEngine.java

Here you can find all the information about the file org.dgpf.search.algorithms.ga.local.LocalGeneticEngine.java. You may explore it here or download it onto your local disk.
/*
 * Copyright (c) 2006 Thomas Weise
 *
 * E-Mail           : tweise@gmx.de
 * Creation Date    : 2006-04-10 16:56:26
 * Original Filename: org.dgpf.search.algorithms.ga.local.LocalGeneticEngine.java
 * Version          : 2.1.2
 * Last modification: 2006-07-15
 *                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.algorithms.ga.local;

import java.io.Serializable;

import org.dgpf.search.algorithms.ga.GeneticEngine;
import org.dgpf.search.algorithms.ga.GeneticParameters;
import org.dgpf.search.api.SearchDefinition;
import org.dgpf.search.api.SearchTaskQueue;
import org.dgpf.search.api.SearchWorkerThread;
import org.sfc.collections.Arrays;
import org.sfc.events.EventPropagator;
import org.sfc.utils.Typesafe;

/**
 * This genetic engine runs on a single computer and does not distribute
 * load in any fashion. It is simple and efficient.
 *
 * @param <Genotype>    The sort of genotype used to represent individuals.
 *                      This must be a serializable type.
 *
 * @author Thomas Weise
 */

public class LocalGeneticEngine<Genotype extends Serializable>
                                         extends GeneticEngine<Genotype>
  {
/**
 * The search definition used by this engine.
 */

  private final SearchDefinition<Genotype>      m_definition  ;
/**
 * The search worker threads used by this engine.
 */

  private       SearchWorkerThread<Genotype>[]  m_swt ;

/**
 * Create a new genetic engine without providing additional information or
 * parameters. This constructor will be used only for loading a snapshot
 * immediately afterwards.
 * @param p_definition  The definition of the evolution process.
 */

  public LocalGeneticEngine  (final SearchDefinition<Genotype>  p_definition)
    {
    super();
    this.m_definition = p_definition;
    }

/**
 * Create a genetic engine.
 * @param p_parameters  The parameters object guiding the evolution process.
 * @param p_definition  The definition of the evolution process.
 * @param p_ndl_size    The size of the non-dominated list. Set this
 *                      to <code>-1</code> for don't care.
 */

  public LocalGeneticEngine(final GeneticParameters<Genotype> p_parameters,
                            final SearchDefinition<Genotype>  p_definition,
                            final int                         p_ndl_size)
    {
    super(p_parameters, p_ndl_size);
    this.m_definition = p_definition;
    this.init_threads(p_definition);
    }

/**
 * <p>
 * This method will be called every generation after the fitness has been
 * calculated and the state was updated, but before the genetic tasks are
 * entered in the task queue.</p><p>
 * You may use it to update worker threads.</p>
 */

  @Override
  protected void  inner_update  ()
    {
    SearchWorkerThread<Genotype>[]  l_swt;
    int                             l_i;
    GeneticParameters<Genotype>     l_gp;

    l_gp = Typesafe.cast(this.get_parameters());

    l_swt = this.m_swt;
    for(l_i = (l_swt.length-1); l_i >= 0; l_i--)
      {
      l_swt[l_i].update_context(l_gp);
      }
    }


/**
 * Initialize the worker threads.
 * @param p_def The search definition to be used for initializing the
 *              threads.
 */

  private final void init_threads(final SearchDefinition<Genotype> p_def)
    {
    SearchWorkerThread<Genotype>[]  l_swt;
    int                             l_i;
    EventPropagator                 l_ep;
    SearchTaskQueue<Genotype>       l_stq;
    GeneticParameters<Genotype>     l_gp;


    l_i   = Runtime.getRuntime().availableProcessors();
    l_swt = Arrays.create(SearchWorkerThread.class, l_i);
    l_ep  = this.get_event_propagator();
    l_stq = this.get_task_queue();

    for(--l_i; l_i >= 0; l_i--)
      {
      l_swt[l_i] = new SearchWorkerThread<Genotype>(
                                          this, l_stq,
                                          p_def.create_context(l_ep));
      }

    l_gp = Typesafe.cast(this.get_parameters());

    for(l_i = (l_swt.length-1); l_i >= 0; l_i--)
      {
      l_swt[l_i].update_context(l_gp);
      }

    this.m_swt = l_swt;
    }

/**
 * This method is called to initialize the search engine. You must all
 * initialization code here.
 * @param p_deserialized  <code>true</code> if and only if this
 *                        initialization was called due to an
 *                        deserialization process, <code>false</code> if it
 *                        is the normal initialization in the constructor.
 */

  @Override
  protected void  initialize  (final boolean p_deserialized)
    {
    super.initialize(p_deserialized);
    if(p_deserialized) this.init_threads(this.m_definition);
    }

/**
 * Startup the search. This method will be called by <code>start()</code>.
 * @see #start()
 */

  @Override
  protected void  do_start  ()
    {
    SearchWorkerThread<Genotype>[]  l_swt;
    int                             l_i;

    super.do_start();

    l_swt = this.m_swt;
    for(l_i = (l_swt.length-1); l_i >= 0; l_i--)
      {
      l_swt[l_i].start();
      }
    }


/**
 * This method aborts the activity. It is guaranteed to be called only once
 * for aborting and once for shutdown.
 * @see #abort()
 * @see #shutdown()
 */

  @Override
  protected void  do_abort  ()
    {
    SearchWorkerThread<Genotype>[]  l_swt;
    int                             l_i;

    super.do_abort();

    l_swt = this.m_swt;
    for(l_i = (l_swt.length-1); l_i >= 0; l_i--)
      {
      l_swt[l_i].abort();
      }
    }


/**
 * Wait for this object.
 */

  @Override
  public  void  wait_for  ()
    {
    SearchWorkerThread<Genotype>[]  l_swt;
    int                             l_i;
    
    l_swt = this.m_swt;

    for(l_i = (l_swt.length-1); l_i >= 0; l_i--)
      {
      l_swt[l_i].wait_for();
      }
    
    super.wait_for();
    }

/**
 * The human readable name of the search engine.
 * @return The human readable name of the search engine.
 */

  @Override
  public  String  toString  ()
    {
    return "Local Genetic Engine";
    }
  }

File Information:

file name:LocalGeneticEngine.java
package:org.dgpf.search.algorithms.ga.local
qualified name:org.dgpf.search.algorithms.ga.local.LocalGeneticEngine.java
file type:Java Source File
download location:download http://dgpf.sourceforge.net/source/org/dgpf/search/algorithms/ga/local/LocalGeneticEngine.java
size:6.871 KB (7036 B)
uploaded: 2018-01-07 12:03:35 GMT+0000
last update: 2006-07-15 09:36:31 GMT+0000
last access: 2018-01-07 12:03:35 GMT+0000

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Warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/project-web/dgpf/htdocs/scripts/datetime.php on line 16

Warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/project-web/dgpf/htdocs/scripts/datetime.php on line 16
last modified at 2018-01-07 12:03:34 GMT+0000
Warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/project-web/dgpf/htdocs/scripts/datetime.php on line 19

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