org.wso2.broker.coordination.rdbms

Class RdbmsCoordinationStrategy

java.lang.Object

org.wso2.broker.coordination.rdbms.RdbmsCoordinationStrategy

All Implemented Interfaces:

CoordinationStrategy, RdbmsMembershipListener

public class RdbmsCoordinationStrategy
extends Object
implements CoordinationStrategy, RdbmsMembershipListener

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, CoordinationConfiguration.RdbmsCoordinationConfiguration rdbmsCoordinationConfiguration) Default constructor.

Method Summary

Modifier and Type	Method and Description
void	coordinatorChanged(String coordinator) Invoked when the coordinator changes in the cluster.
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	memberAdded(String nodeID) Invoked when a new member is added to the cluster.
void	memberRemoved(String nodeID) Invoked when an existing member leaves the cluster.
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,
                                 CoordinationConfiguration.RdbmsCoordinationConfiguration rdbmsCoordinationConfiguration)

Default constructor.

Parameters:

rdbmsCoordinationDaoImpl - the RdbmsCoordinationDaoImpl to use for communication with the database

rdbmsCoordinationConfiguration - the configuration for RDBMS coordination

Method Detail

memberAdded

public void memberAdded(String nodeID)

Invoked when a new member is added to the cluster.

Specified by:

memberAdded in interface RdbmsMembershipListener

Parameters:

nodeID - node ID of the new node

memberRemoved

public void memberRemoved(String nodeID)

Invoked when an existing member leaves the cluster.

Specified by:

memberRemoved in interface RdbmsMembershipListener

Parameters:

nodeID - node ID of the removed node

coordinatorChanged

public void coordinatorChanged(String coordinator)

Invoked when the coordinator changes in the cluster.

Specified by:

coordinatorChanged in interface RdbmsMembershipListener

Parameters:

coordinator - node ID of the new coordinator node

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