org.wso2.broker.coordination.rdbms

Class RdbmsCoordinationStrategy

java.lang.Object

org.wso2.broker.coordination.rdbms.RdbmsCoordinationStrategy

All Implemented Interfaces:

CoordinationStrategy

public class RdbmsCoordinationStrategy
extends Object
implements CoordinationStrategy

RdbmsCoordinationStrategy uses a RDBMS based approached to identify membership events related to the cluster. This includes electing the coordinator and notifying member added and left events.

Constructor Summary

Constructors

Constructor and Description
RdbmsCoordinationStrategy(RdbmsCoordinationDaoImpl rdbmsCoordinationDaoImpl, Map<String,String> rdbmsCoordinationOptions) Default constructor.

Method Summary

Modifier and Type	Method and Description
void	addCoordinationListener(RdbmsCoordinationListener rdbmsCoordinationListener) Method to set listeners expecting notifications regarding changes in the coordinator.
List<NodeDetail>	getAllNodeDetails() Retrieve node details of all the nodes.
List<String>	getAllNodeIdentifiers() Retrieve IDs of all the nodes.
String	getNodeIdentifierOfCoordinator() Retrieve the node ID of the coordinator node.
boolean	isCoordinator() Used to query if the current node is the coordinator.
void	removeCoordinationListener(RdbmsCoordinationListener rdbmsCoordinationListener) Method to remove a listener set expecting notifications regarding changes in the coordinator.
void	start() Meant to be invoked when the coordination algorithm should start working.
void	stop() Meant to be invoked when the coordination algorithm should stop working.

Methods inherited from class java.lang.Object

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

Constructor Detail

RdbmsCoordinationStrategy

public RdbmsCoordinationStrategy(RdbmsCoordinationDaoImpl rdbmsCoordinationDaoImpl,
                                 Map<String,String> rdbmsCoordinationOptions)

Default constructor.

Parameters:

rdbmsCoordinationDaoImpl - the RdbmsCoordinationDaoImpl to use for communication with the database

rdbmsCoordinationOptions - the configuration for RDBMS coordination

Method Detail

start

public void start()

Meant to be invoked when the coordination algorithm should start working. This is typically invoked during the server start up.

Specified by:

start in interface CoordinationStrategy

isCoordinator

public boolean isCoordinator()

Used to query if the current node is the coordinator.

Specified by:

isCoordinator in interface CoordinationStrategy

Returns:

true if the current node is the coordinator, false otherwise

getNodeIdentifierOfCoordinator

public String getNodeIdentifierOfCoordinator()
                                      throws CoordinationException

Retrieve the node ID of the coordinator node.

Specified by:

getNodeIdentifierOfCoordinator in interface CoordinationStrategy

Returns:

node ID of the coordinator

Throws:

CoordinationException

getAllNodeIdentifiers

public List<String> getAllNodeIdentifiers()
                                   throws CoordinationException

Retrieve IDs of all the nodes.

Specified by:

getAllNodeIdentifiers in interface CoordinationStrategy

Returns:

list of member IDs

Throws:

CoordinationException

getAllNodeDetails

public List<NodeDetail> getAllNodeDetails()
                                   throws CoordinationException

Retrieve node details of all the nodes.

Specified by:

getAllNodeDetails in interface CoordinationStrategy

Returns:

list of node details

Throws:

CoordinationException

stop

public void stop()

Meant to be invoked when the coordination algorithm should stop working. This is typically during the server shutdown.

Specified by:

stop in interface CoordinationStrategy

addCoordinationListener

public void addCoordinationListener(RdbmsCoordinationListener rdbmsCoordinationListener)

Method to set listeners expecting notifications regarding changes in the coordinator.

Parameters:

rdbmsCoordinationListener - a listener to set

removeCoordinationListener

public void removeCoordinationListener(RdbmsCoordinationListener rdbmsCoordinationListener)

Method to remove a listener set expecting notifications regarding changes in the coordinator.

Parameters:

rdbmsCoordinationListener - the listener to remove