org.graylog2.cluster.leader

Class AutomaticLeaderElectionService

java.lang.Object

com.google.common.util.concurrent.AbstractExecutionThreadService

org.graylog2.cluster.leader.AutomaticLeaderElectionService

All Implemented Interfaces:

com.google.common.util.concurrent.Service, LeaderElectionService

@Singleton
public class AutomaticLeaderElectionService
extends com.google.common.util.concurrent.AbstractExecutionThreadService
implements LeaderElectionService

Nested Class Summary

Nested classes/interfaces inherited from interface com.google.common.util.concurrent.Service

com.google.common.util.concurrent.Service.Listener, com.google.common.util.concurrent.Service.State

Field Summary

Fields

Modifier and Type	Field and Description
static Duration	DEFAULT_POLLING_INTERVAL

Constructor Summary

Constructors

Constructor and Description
AutomaticLeaderElectionService(Configuration configuration, LockService lockService, com.google.common.eventbus.EventBus eventBus, NodePingThread nodePingThread)

Method Summary

Modifier and Type	Method and Description
boolean	isLeader() Check if the current node is the leader of the cluster.
protected void	run()
protected void	shutDown()
protected void	startUp()
protected void	triggerShutdown()

Methods inherited from class com.google.common.util.concurrent.AbstractExecutionThreadService

addListener, awaitRunning, awaitRunning, awaitRunning, awaitTerminated, awaitTerminated, awaitTerminated, executor, failureCause, isRunning, serviceName, startAsync, state, stopAsync, toString

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_POLLING_INTERVAL

public static final Duration DEFAULT_POLLING_INTERVAL

Constructor Detail

AutomaticLeaderElectionService

@Inject
public AutomaticLeaderElectionService(Configuration configuration,
                                              LockService lockService,
                                              com.google.common.eventbus.EventBus eventBus,
                                              NodePingThread nodePingThread)

Method Detail

startUp

protected void startUp()
                throws Exception

Overrides:

startUp in class com.google.common.util.concurrent.AbstractExecutionThreadService

Throws:

Exception

triggerShutdown

protected void triggerShutdown()

Overrides:

triggerShutdown in class com.google.common.util.concurrent.AbstractExecutionThreadService

shutDown

protected void shutDown()

Overrides:

shutDown in class com.google.common.util.concurrent.AbstractExecutionThreadService

isLeader

public boolean isLeader()

Description copied from interface: LeaderElectionService

Check if the current node is the leader of the cluster.

This method might be called frequently. Implementations should be performant and resource-friendly.

Specified by:

isLeader in interface LeaderElectionService

Returns:

true if the current node is the leader, false if it is not

run

protected void run()
            throws Exception

Specified by:

run in class com.google.common.util.concurrent.AbstractExecutionThreadService

Throws:

Exception