org.opennms.features.distributed.coordination.zookeeper

Class ZookeeperDomainManager

java.lang.Object

org.opennms.features.distributed.coordination.common.AbstractDomainManager

org.opennms.features.distributed.coordination.common.ConnectionBasedDomainManager

org.opennms.features.distributed.coordination.zookeeper.ZookeeperDomainManager

All Implemented Interfaces:

DomainManager

public final class ZookeeperDomainManager
extends ConnectionBasedDomainManager

A DomainManager that uses Apache ZooKeeper for leadership elections.

Method Summary

Modifier and Type	Method and Description
protected void	connect() Implementations must connect via this method.
protected void	disconnect() Implementations must disconnect via this method.
protected void	failedToConnect(Throwable exception) Implementations can optionally override this if they need special handling for a failure to connect.
String	toString()

Methods inherited from class org.opennms.features.distributed.coordination.common.ConnectionBasedDomainManager

isConnected, onFirstRegister, onLastDeregister

Methods inherited from class org.opennms.features.distributed.coordination.common.AbstractDomainManager

becomeActive, becomeStandby, deregister, getCurrentRole, getDomain, getRoleChangeHandlers, isAnythingRegistered, isRegistered, register

Methods inherited from class java.lang.Object

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

Method Detail

failedToConnect

protected void failedToConnect(Throwable exception)

Description copied from class: ConnectionBasedDomainManager

Implementations can optionally override this if they need special handling for a failure to connect.

Overrides:

failedToConnect in class ConnectionBasedDomainManager

Parameters:

exception - the exception that caused the failure the connect

connect

protected void connect()

Description copied from class: ConnectionBasedDomainManager

Implementations must connect via this method.

This is executed in a separate thread so timeliness is not a factor. It is possible that multiple calls to connect() block waiting for the first one to finish so implementations of this method must be written to guard against this being a problem.

Specified by:

connect in class ConnectionBasedDomainManager

disconnect

protected void disconnect()

Description copied from class: ConnectionBasedDomainManager

Implementations must disconnect via this method.

This is executed in a separate thread so timeliness is not a factor. It is possible that multiple calls to disconnect() block waiting for the first one to finish so implementations of this method must be written to guard against this being a problem.

Specified by:

disconnect in class ConnectionBasedDomainManager

toString

public String toString()

Overrides:

toString in class ConnectionBasedDomainManager