Package 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:

java.io.Closeable, java.lang.AutoCloseable, org.apache.hadoop.service.Service

@Public
@Evolving
public abstract class AbstractLivelinessMonitor<O>
extends org.apache.hadoop.service.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

org.apache.hadoop.service.Service.STATE

Field Summary

Fields

Modifier and Type	Field	Description
static int	DEFAULT_EXPIRE

Constructor Summary

Constructors

Constructor	Description
AbstractLivelinessMonitor(java.lang.String name)
AbstractLivelinessMonitor(java.lang.String name, Clock clock)

Method Summary

Modifier and Type	Method	Description
protected abstract void	expire(O ob)
protected long	getExpireInterval(O o)
void	receivedPing(O ob)
void	register(O ob)
void	register(O ob, long expireTime)
void	resetTimer()
protected void	serviceStart()
protected void	serviceStop()
protected void	setExpireInterval(long expireInterval)
protected void	setMonitorInterval(long monitorInterval)
protected void	setResetTimeOnStart(boolean resetTimeOnStart)
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(java.lang.String name,
                                 Clock clock)

AbstractLivelinessMonitor

public AbstractLivelinessMonitor(java.lang.String name)

Method Detail

serviceStart

protected void serviceStart()
                     throws java.lang.Exception

Overrides:

serviceStart in class org.apache.hadoop.service.AbstractService

Throws:

java.lang.Exception

serviceStop

protected void serviceStop()
                    throws java.lang.Exception

Overrides:

serviceStop in class org.apache.hadoop.service.AbstractService

Throws:

java.lang.Exception

expire

protected abstract void expire(O ob)

setExpireInterval

protected void setExpireInterval(long expireInterval)

getExpireInterval

protected long getExpireInterval(O o)

setMonitorInterval

protected void setMonitorInterval(long monitorInterval)

receivedPing

public void receivedPing(O ob)

register

public void register(O ob)

register

public void register(O ob,
                     long expireTime)

unregister

public void unregister(O ob)

resetTimer

public void resetTimer()

setResetTimeOnStart

protected void setResetTimeOnStart(boolean resetTimeOnStart)