src/org/objectweb/cjdbc/controller/loadbalancer/policies/errorchecking/ErrorCheckingPolicy.java

説明を見る。

package org.objectweb.cjdbc.controller.loadbalancer.policies.errorchecking;

import java.util.ArrayList;

import org.objectweb.cjdbc.common.xml.DatabasesXmlTags;

public abstract class ErrorCheckingPolicy
{
  public static final int RANDOM = 0;

  public static final int ROUND_ROBIN = 1;

  public static final int ALL = 2;

  protected int nbOfNodes = 0;

  protected int policy;

  public ErrorCheckingPolicy(int policy, int numberOfNodes)
  {
    setPolicy(policy);
    setNumberOfNodes(numberOfNodes);
  }

  public int getNumberOfNodes()
  {
    return nbOfNodes;
  }

  public void setNumberOfNodes(int numberOfNodes)
  {
    if (numberOfNodes < 3)
      throw new IllegalArgumentException(
        "You must use at least 3 nodes for error checking ("
          + numberOfNodes
          + " is not acceptable)");
    this.nbOfNodes = numberOfNodes;
  }

  public int getPolicy()
  {
    return policy;
  }

  public void setPolicy(int policy)
  {
    this.policy = policy;
  }

  public abstract ArrayList getBackends(ArrayList backends)
    throws ErrorCheckingException;

  public abstract String getInformation();

  public String getXml()
  
  {
    StringBuffer info = new StringBuffer();
    info.append(
      "<"
        + DatabasesXmlTags.ELT_ErrorChecking
        + " />"
        + DatabasesXmlTags.ATT_numberOfNodes
        + "=\""
        + this.getNumberOfNodes()
        + "\" "
        + DatabasesXmlTags.ATT_policy
        + "=\"");
    switch (policy)
    {
      case RANDOM :
        info.append(DatabasesXmlTags.VAL_random);
      case ROUND_ROBIN :
        info.append(DatabasesXmlTags.VAL_roundRobin);
      case ALL :
        info.append(DatabasesXmlTags.VAL_all);
      default :
        }
    info.append("\"/>");
    return info.toString();
  }
}

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