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

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

public class ErrorCheckingRoundRobin

extends ErrorCheckingPolicy

Chooses the number of nodes nodes for error checking using a round-robin algorithm.

Version:

1.0

Author:

Emmanuel Cecchet

Field Summary

private int

index Round-robin index.

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

ALL, nbOfNodes, policy, RANDOM, ROUND_ROBIN

Constructor Summary

ErrorCheckingRoundRobin(int numberOfNodes)
Creates a new ErrorCheckingRoundRobin 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

index

private int index

Round-robin index.

Constructor Detail

ErrorCheckingRoundRobin

public ErrorCheckingRoundRobin(int numberOfNodes)

Creates a new ErrorCheckingRoundRobin instance.

Parameters:

numberOfNodes - number of nodes

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()