org.apache.slider.providers.agent

Class HeartbeatMonitor

java.lang.Object

org.apache.slider.providers.agent.HeartbeatMonitor

All Implemented Interfaces:

Runnable

public class HeartbeatMonitor
extends Object
implements Runnable

Monitors the container state and heartbeats.

Field Summary

Fields

Modifier and Type	Field and Description
protected static org.slf4j.Logger	log

Constructor Summary

Constructors

Constructor and Description
HeartbeatMonitor(AgentProviderService provider, int threadWakeupInterval)

Method Summary

Methods

Modifier and Type	Method and Description
void	doWork(long now) Every interval the current state of the container are checked.
boolean	isAlive()
void	run()
void	shutdown()
void	start()

Methods inherited from class java.lang.Object

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

Field Detail

log

protected static final org.slf4j.Logger log

Constructor Detail

HeartbeatMonitor

public HeartbeatMonitor(AgentProviderService provider,
                int threadWakeupInterval)

Method Detail

shutdown

public void shutdown()

start

public void start()

isAlive

public boolean isAlive()

run

public void run()

Specified by:

run in interface Runnable

doWork

public void doWork(long now)

Every interval the current state of the container are checked. If the state is INIT or HEALTHY and no HB are received in last check interval they are marked as UNHEALTHY. INIT is when the agent is started but it did not communicate at all. HEALTHY being the AM has received heartbeats. After an interval as UNHEALTHY the container is declared unavailable

Parameters:

now - current time in milliseconds ... tests can set this explicitly