org.apache.hadoop.yarn.util

Class AbstractLivelinessMonitor<O>

java.lang.Object

org.apache.hadoop.service.AbstractService

org.apache.hadoop.yarn.util.AbstractLivelinessMonitor<O>

All Implemented Interfaces:

Closeable, AutoCloseable, Service

@InterfaceAudience.Public
 @InterfaceStability.Evolving
public abstract class AbstractLivelinessMonitor<O>
extends AbstractService

A simple liveliness monitor with which clients can register, trust the component to monitor liveliness, get a call-back on expiry and then finally unregister.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.hadoop.service.Service

Service.STATE

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEFAULT_EXPIRE

Constructor Summary

Constructors

Constructor and Description
AbstractLivelinessMonitor(String name, Clock clock)

Method Summary

Modifier and Type	Method and Description
protected abstract void	expire(O ob)
void	receivedPing(O ob)
void	register(O ob)
void	resetTimer()
protected void	serviceStart()
protected void	serviceStop()
protected void	setExpireInterval(int expireInterval)
protected void	setMonitorInterval(int monitorInterval)
void	unregister(O ob)

Methods inherited from class org.apache.hadoop.service.AbstractService

close, getBlockers, getConfig, getFailureCause, getFailureState, getLifecycleHistory, getName, getServiceState, getStartTime, init, isInState, noteFailure, putBlocker, registerGlobalListener, registerServiceListener, removeBlocker, serviceInit, setConfig, start, stop, toString, unregisterGlobalListener, unregisterServiceListener, waitForServiceToStop

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_EXPIRE

public static final int DEFAULT_EXPIRE

See Also:

Constant Field Values

Constructor Detail

AbstractLivelinessMonitor

public AbstractLivelinessMonitor(String name,
                                 Clock clock)

Method Detail

serviceStart

protected void serviceStart()
                     throws Exception

Overrides:

serviceStart in class AbstractService

Throws:

Exception

serviceStop

protected void serviceStop()
                    throws Exception

Overrides:

serviceStop in class AbstractService

Throws:

Exception

expire

protected abstract void expire(O ob)

setExpireInterval

protected void setExpireInterval(int expireInterval)

setMonitorInterval

protected void setMonitorInterval(int monitorInterval)

receivedPing

public void receivedPing(O ob)

register

public void register(O ob)

unregister

public void unregister(O ob)

resetTimer

public void resetTimer()