alluxio.master.service.jvmmonitor

Class JvmMonitorService

java.lang.Object

alluxio.master.service.jvmmonitor.JvmMonitorService

All Implemented Interfaces:

SimpleService

public class JvmMonitorService
extends Object
implements SimpleService

Created by JvmMonitorService.Factory. This service creates and starts a JvmPauseMonitor upon being started and stops said pause monitor upon being stopped.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	JvmMonitorService.Factory Factory that returns the appropriate JvmMonitorService based on configuration.

Field Summary

Fields

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

Method Summary

Modifier and Type	Method and Description
void	demote() Demotes the service back to NodeState.STANDBY state.
void	promote() Promotes the service to NodeState.PRIMARY state.
void	start() Starts the service.
void	stop() Stops the service altogether and cleans up any state left.

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

Method Detail

start

public void start()

Description copied from interface: SimpleService

Starts the service. Leaves the service in NodeState.STANDBY state. Leaves the service in the same state as SimpleService.demote(). Can only be called once.

Specified by:

start in interface SimpleService

promote

public void promote()

Description copied from interface: SimpleService

Promotes the service to NodeState.PRIMARY state. Can only be called on a started service (i.e. SimpleService.start() must precede this method). Can only be called in NodeState.STANDBY state. Can be called multiple times (e.g. a service is promoted, then demoted, then promoted again).

Specified by:

promote in interface SimpleService

demote

public void demote()

Description copied from interface: SimpleService

Demotes the service back to NodeState.STANDBY state. Can only be called on a started service (i.e. SimpleService.start() must precede this method). Can only be called in NodeState.PRIMARY state (i.e. SimpleService.promote() must precede this method). Can be called multiple times (e.g. a service is promoted, then demoted, then promoted again, and demoted again).

Specified by:

demote in interface SimpleService

stop

public void stop()

Description copied from interface: SimpleService

Stops the service altogether and cleans up any state left. If SimpleService.start() has not been called on this service this method should be a noop. Can only be called once.

Specified by:

stop in interface SimpleService