org.objectweb.cjdbc.controller.loadbalancer.policies.errorchecking
Class ErrorCheckingRandom

java.lang.Object
  org.objectweb.cjdbc.controller.loadbalancer.policies.errorchecking.ErrorCheckingPolicy
      org.objectweb.cjdbc.controller.loadbalancer.policies.errorchecking.ErrorCheckingRandom

public class ErrorCheckingRandom

extends ErrorCheckingPolicy

Chooses numberOfNodes nodes randomly for error checking.

Version:

1.0

Author:

Emmanuel Cecchet

Field Summary

private java.util.Random

random

Fields inherited from class org.objectweb.cjdbc.controller.loadbalancer.policies.errorchecking.ErrorCheckingPolicy

ALL, nbOfNodes, policy, RANDOM, ROUND_ROBIN

Constructor Summary

ErrorCheckingRandom(int numberOfNodes)
Creates a new ErrorCheckingRandom instance.

Method Summary

java.util.ArrayList	getBackends(java.util.ArrayList backends) Pickups backends from the given backends arraylist according to the current rule policy.
java.lang.String	getInformation() Gives information about the current policy.

Methods inherited from class org.objectweb.cjdbc.controller.loadbalancer.policies.errorchecking.ErrorCheckingPolicy

getNumberOfNodes, getPolicy, getXml, setNumberOfNodes, setPolicy

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

random

private java.util.Random random

Constructor Detail

ErrorCheckingRandom

public ErrorCheckingRandom(int numberOfNodes)

Creates a new ErrorCheckingRandom instance.

Parameters:

numberOfNodes - number of nodes to use to check for errors on a query

Method Detail

getBackends

public java.util.ArrayList getBackends(java.util.ArrayList backends)
                                throws ErrorCheckingException

Description copied from class: ErrorCheckingPolicy

Pickups backends from the given backends arraylist according to the current rule policy.

Specified by:

getBackends in class ErrorCheckingPolicy

Parameters:

backends - backends to choose from

Returns:

Arraylist of choosen DatabaseBackend

Throws:

ErrorCheckingException - if the rule cannot be applied

See Also:

ErrorCheckingPolicy.getBackends(ArrayList)

getInformation

public java.lang.String getInformation()

Description copied from class: ErrorCheckingPolicy

Gives information about the current policy.

Specified by:

getInformation in class ErrorCheckingPolicy

Returns:

a String value

See Also:

ErrorCheckingPolicy.getInformation()