/*
    * $Id: Node.java 1540 2011-08-17 13:30:37Z hoheisel $
    *
    * Copyright (c) Jun 27, 2006
    * Fraunhofer Institute for Computer Architecture and Software Technology
    * See http://www.first.fraunhofer.de for more details.
    */
   
   package net.kwfgrid.gwes.prorater;
  
  import net.kwfgrid.gwes.XMLDB;
  import net.kwfgrid.gwes.exception.DatabaseException;
  import org.apache.log4j.Logger;
  
  import java.util.ArrayList;
  
  /**
   * Description of a computing node
   *
   * @author Helge Rose'
   * @version $Id: Node.java 1540 2011-08-17 13:30:37Z hoheisel $
   */
  public class Node implements Comparable {
  
  	/**
       * log4j logger.
       */
      final static Logger logger = Logger.getLogger(Node.class);
  
      /**
       * host name
       */
      String hostname;
  
      /**
       * alternative operationCandidates involving this host
       */
      ArrayList<Alternative> alternatives;
  
      /**
       * load quality of this host
       */
      public float quality;
  
      public Node(String name) {
          alternatives = new ArrayList<Alternative>();
          hostname = name;
      }
  
      void add(Alternative alternative) {
          alternative.operationCandidate.setQuality(quality);
          alternative.operationCandidate.setSelected(false);
          alternatives.add(alternative);
      }
  
      // only used for testing purposes
      public void setQuality(float quality) {
          this.quality = quality;
          logger.debug(hostname + ": " + quality);
      }
  
      void updateQuality(float oldQuality) {
          try {
              quality = XMLDB.getInstance().getHardwareQuality(hostname);
              logger.debug("Retrieved quality for resource "+ hostname + ": quality=" + quality);
          } catch (DatabaseException e) {
              quality = oldQuality;
              logger.warn("Could not connect to resource database. Using old quality="+quality+" for resource "+ hostname + ". "+e);
          }
      }
  
      public int compareTo(Object o)
      {
          float difference = quality - ((Node) o).quality;
          if (difference > 0) return 1;
          if (difference < 0) return -1;
          return 0;
      }
  
  
  }