com.spotify.helios.agent

Class AgentZooKeeperRegistrar

java.lang.Object

com.spotify.helios.agent.AgentZooKeeperRegistrar

All Implemented Interfaces:

ZooKeeperRegistrar

public class AgentZooKeeperRegistrar
extends Object
implements ZooKeeperRegistrar

Persistently tries to register with ZK in the face of a ZK outage.

Constructor Summary

Constructors

Constructor and Description
AgentZooKeeperRegistrar(String name, String id, int zooKeeperRegistrationTtlMinutes, com.spotify.helios.common.Clock clock)

Method Summary

Modifier and Type	Method and Description
void	shutDown() Called upon shutdown
void	startUp() Called upon startup
boolean	tryToRegister(ZooKeeperClient client) Called when ZK client connects.

Methods inherited from class java.lang.Object

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

Constructor Detail

AgentZooKeeperRegistrar

public AgentZooKeeperRegistrar(String name,
                               String id,
                               int zooKeeperRegistrationTtlMinutes,
                               com.spotify.helios.common.Clock clock)

Method Detail

startUp

public void startUp()
             throws Exception

Description copied from interface: ZooKeeperRegistrar

Called upon startup

Specified by:

startUp in interface ZooKeeperRegistrar

Throws:

Exception - If an unexpected error occurs.

shutDown

public void shutDown()
              throws Exception

Description copied from interface: ZooKeeperRegistrar

Called upon shutdown

Specified by:

shutDown in interface ZooKeeperRegistrar

Throws:

Exception - If an unexpected error occurs.

tryToRegister

public boolean tryToRegister(ZooKeeperClient client)
                      throws org.apache.zookeeper.KeeperException,
                             HostNotFoundException

Description copied from interface: ZooKeeperRegistrar

Called when ZK client connects. Handler should attempt to do on connection initialization here.

Specified by:

tryToRegister in interface ZooKeeperRegistrar

Parameters:

client - The zookeeper client.

Returns:

if registration was successful

Throws:

org.apache.zookeeper.KeeperException - If an unexpected zookeeper error occurs.

HostNotFoundException - If the hostname we are trying to re-register as doesn't exist.