Package org.apache.druid.java.util.metrics

Class AbstractMonitor

java.lang.Object

org.apache.druid.java.util.metrics.AbstractMonitor

All Implemented Interfaces:

Monitor

Direct Known Subclasses:

ExecutorServiceMonitor, FeedDefiningMonitor

public abstract class AbstractMonitor
extends Object
implements Monitor

Constructor Summary

Constructors

Constructor	Description
AbstractMonitor()

Method Summary

Modifier and Type	Method	Description
abstract boolean	doMonitor(ServiceEmitter emitter)
boolean	isStarted()
boolean	monitor(ServiceEmitter emitter)	Emit metrics using the given emitter.
void	start()
void	stop()

Methods inherited from class java.lang.Object

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

Constructor Details

AbstractMonitor

public AbstractMonitor()

Method Details

start

public void start()

Specified by:

start in interface Monitor

stop

public void stop()

Specified by:

stop in interface Monitor

isStarted

public boolean isStarted()

monitor

public boolean monitor(ServiceEmitter emitter)

Description copied from interface: Monitor

Emit metrics using the given emitter. May be called from two separate threads: the scheduling thread and a lifecycle thread that is shutting down monitors. Therefore, this method must be thread-safe.

Specified by:

monitor in interface Monitor

Returns:

true if this monitor needs to continue monitoring. False otherwise.

doMonitor

public abstract boolean doMonitor(ServiceEmitter emitter)