Package com.yahoo.container.jdisc.state

Class StateMonitor

java.lang.Object

com.yahoo.component.AbstractComponent

com.yahoo.container.jdisc.state.StateMonitor

All Implemented Interfaces:

com.yahoo.component.Component, java.lang.Comparable<com.yahoo.component.Component>

public class StateMonitor
extends com.yahoo.component.AbstractComponent

A state monitor keeps track of the current health and metrics state of a container. It is used by jDisc to hand out metric update API endpoints to workers through newMetricConsumer(), and to inspect the current accumulated state of metrics through snapshot.

Author:

Simon Thoresen Hult

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	StateMonitor.Status

Field Summary

Fields inherited from class com.yahoo.component.AbstractComponent

isDeconstructable

Constructor Summary

Constructors

Constructor	Description
StateMonitor()	For testing
StateMonitor(long snapshotIntervalMS, StateMonitor.Status status, com.yahoo.jdisc.Timer timer, java.util.concurrent.ThreadFactory threadFactory)
StateMonitor(HealthMonitorConfig config, com.yahoo.jdisc.Timer timer)

Method Summary

Modifier and Type	Method	Description
void	deconstruct()
long	getSnapshotIntervalMillis()	Returns the interval between each metrics snapshot used by this
com.yahoo.jdisc.application.MetricConsumer	newMetricConsumer()	Returns a metric consumer for jDisc which will write metrics back to this
MetricSnapshot	snapshot()	Returns the last snapshot taken of the metrics in this system
StateMonitor.Status	status()
void	status(StateMonitor.Status status)

Methods inherited from class com.yahoo.component.AbstractComponent

clone, compareTo, getClassName, getId, getIdString, hasInitializedId, initId, isDeconstructable, setIsDeconstructable, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

StateMonitor

public StateMonitor()

For testing

StateMonitor

@Inject
public StateMonitor(HealthMonitorConfig config,
                    com.yahoo.jdisc.Timer timer)

StateMonitor

public StateMonitor(long snapshotIntervalMS,
                    StateMonitor.Status status,
                    com.yahoo.jdisc.Timer timer,
                    java.util.concurrent.ThreadFactory threadFactory)

Method Detail

newMetricConsumer

public com.yahoo.jdisc.application.MetricConsumer newMetricConsumer()

Returns a metric consumer for jDisc which will write metrics back to this

status

public void status(StateMonitor.Status status)

status

public StateMonitor.Status status()

snapshot

public MetricSnapshot snapshot()

Returns the last snapshot taken of the metrics in this system

getSnapshotIntervalMillis

public long getSnapshotIntervalMillis()

Returns the interval between each metrics snapshot used by this

deconstruct

public void deconstruct()

Overrides:

deconstruct in class com.yahoo.component.AbstractComponent