org.objectweb.cjdbc.controller.loadbalancer.paralleldb
Class ParallelDB_RR

java.lang.Object
  javax.management.StandardMBean
      org.objectweb.cjdbc.controller.jmx.AbstractStandardMBean
          org.objectweb.cjdbc.controller.loadbalancer.AbstractLoadBalancer
              org.objectweb.cjdbc.controller.loadbalancer.paralleldb.ParallelDB
                  org.objectweb.cjdbc.controller.loadbalancer.paralleldb.ParallelDB_RR

All Implemented Interfaces:

AbstractLoadBalancerMBean, javax.management.DynamicMBean, javax.management.NotificationBroadcaster, javax.management.NotificationEmitter, XmlComponent

public class ParallelDB_RR

extends ParallelDB

This class defines a ParallelDB_RR load balancer. This load balancer performs simple round-robin for read and write queries execution.

Version:

1.0

Author:

Emmanuel Cecchet

Nested Class Summary

Nested classes inherited from class javax.management.StandardMBean

Field Summary

private int

index

Fields inherited from class org.objectweb.cjdbc.controller.loadbalancer.paralleldb.ParallelDB

Fields inherited from class org.objectweb.cjdbc.controller.loadbalancer.AbstractLoadBalancer

logger, macroHandler, parsingGranularity, raidbLevel, totalOrderQueue, vdb

Fields inherited from class org.objectweb.cjdbc.controller.jmx.AbstractStandardMBean

Fields inherited from class javax.management.StandardMBean

Fields inherited from interface org.objectweb.cjdbc.common.xml.XmlComponent

DOCTYPE_CONTROLLER, DOCTYPE_DB, XML_VERSION

Constructor Summary

ParallelDB_RR(VirtualDatabase vdb)
Creates a new ParallelDB_RR object

Method Summary

DatabaseBackend	chooseBackendForReadRequest(AbstractRequest request) Choose a backend using a round-robin algorithm for read request execution.
DatabaseBackend	chooseBackendForWriteRequest(AbstractWriteRequest request) Choose a backend using a round-robin algorithm for write request execution.
java.lang.String	getInformation() Get information about the Request Load Balancer
java.lang.String	getParallelDBXml() Return the XML tags of the ParallelDB load balancer implementation.

Methods inherited from class org.objectweb.cjdbc.controller.loadbalancer.paralleldb.ParallelDB

begin, commit, disableBackend, enableBackend, execReadOnlyReadStoredProcedure, execReadRequest, execReadStoredProcedure, execWriteRequest, execWriteRequestWithKeys, execWriteStoredProcedure, getNumberOfEnabledBackends, getXmlImpl, releaseSavepoint, rollback, rollback, setSavepoint

Methods inherited from class org.objectweb.cjdbc.controller.loadbalancer.AbstractLoadBalancer

executeReadStoredProcedureOnBackend, executeSelectRequestOnBackend, executeUpdateRequestOnBackend, executeUpdateRequestOnBackendWithKeys, executeWriteStoredProcedureOnBackend, getAssociatedString, getConnectionAndBeginTransaction, getParsingGranularity, getRAIDbLevel, getXml, handleMacros, removeHeadFromAndNotifyTotalOrderQueue, setMacroHandler, setParsingGranularity, setRAIDbLevel, setWeight, waitForTotalOrder

Methods inherited from class org.objectweb.cjdbc.controller.jmx.AbstractStandardMBean

addNotificationListener, getDescription, getDescription, getDescription, getDescription, getDescription, getDescription, getNotificationInfo, getParameterName, getParameterName, removeNotificationListener, removeNotificationListener, sendNotification

Methods inherited from class javax.management.StandardMBean

cacheMBeanInfo, getAttribute, getAttributes, getCachedMBeanInfo, getClassName, getConstructors, getDescription, getImpact, getImplementation, getImplementationClass, getMBeanInfo, getMBeanInterface, invoke, setAttribute, setAttributes, setImplementation

Methods inherited from class java.lang.Object

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

Field Detail

index

private int index

Constructor Detail

ParallelDB_RR

public ParallelDB_RR(VirtualDatabase vdb)
              throws java.lang.Exception

Creates a new ParallelDB_RR object

Parameters:

vdb - the virtual database this load balancer belongs to.

Throws:

java.lang.Exception - if an error occurs

Method Detail

chooseBackendForReadRequest

public DatabaseBackend chooseBackendForReadRequest(AbstractRequest request)
                                            throws java.sql.SQLException

Choose a backend using a round-robin algorithm for read request execution.

Specified by:

chooseBackendForReadRequest in class ParallelDB

Parameters:

request - request to execute

Returns:

the chosen backend

Throws:

java.sql.SQLException - if an error occurs

chooseBackendForWriteRequest

public DatabaseBackend chooseBackendForWriteRequest(AbstractWriteRequest request)
                                             throws java.sql.SQLException

Choose a backend using a round-robin algorithm for write request execution.

Specified by:

chooseBackendForWriteRequest in class ParallelDB

Parameters:

request - request to execute

Returns:

the chosen backend

Throws:

java.sql.SQLException - if an error occurs

getInformation

public java.lang.String getInformation()

Description copied from class: AbstractLoadBalancer

Get information about the Request Load Balancer

Specified by:

getInformation in interface AbstractLoadBalancerMBean

Specified by:

getInformation in class AbstractLoadBalancer

Returns:

String containing information

See Also:

AbstractLoadBalancer.getInformation()

getParallelDBXml

public java.lang.String getParallelDBXml()

Description copied from class: ParallelDB

Return the XML tags of the ParallelDB load balancer implementation.

Specified by:

getParallelDBXml in class ParallelDB

Returns:

content of ParallelDB xml

See Also:

ParallelDB.getParallelDBXml()