com.netflix.servo.monitor

Class AbstractContextualMonitor<T,M extends Monitor<T>>

java.lang.Object

com.netflix.servo.monitor.AbstractContextualMonitor<T,M>

All Implemented Interfaces:

CompositeMonitor<T>, Monitor<T>

Direct Known Subclasses:

ContextualCounter, ContextualTimer

public abstract class AbstractContextualMonitor<T,M extends Monitor<T>>
extends java.lang.Object
implements CompositeMonitor<T>

Base class used to simplify creation of contextual monitors.

Field Summary

Fields

Modifier and Type	Field and Description
protected MonitorConfig	baseConfig Base configuration shared across all contexts.
protected TaggingContext	context Context to query when accessing a monitor.
protected java.util.concurrent.ConcurrentMap<MonitorConfig,M>	monitors Thread-safe map keeping track of the distinct monitors that have been created so far.
protected com.google.common.base.Function<MonitorConfig,M>	newMonitor Factory funtion used to create a new instance of a monitor.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractContextualMonitor(MonitorConfig baseConfig, TaggingContext context, com.google.common.base.Function<MonitorConfig,M> newMonitor) Create a new instance of the monitor.

Method Summary

Methods

Modifier and Type	Method and Description
MonitorConfig	getConfig() Configuration used to identify a monitor and provide metadata used in aggregations.
protected M	getMonitorForCurrentContext() Returns a monitor instance for the current context.
java.util.List<Monitor<?>>	getMonitors() Returns a list of sub-monitors for this composite.
T	getValue() Returns the current value for the monitor for the default polling interval.

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.netflix.servo.monitor.Monitor

getValue

Field Detail

baseConfig

protected final MonitorConfig baseConfig

Base configuration shared across all contexts.

context

protected final TaggingContext context

Context to query when accessing a monitor.

newMonitor

protected final com.google.common.base.Function<MonitorConfig,M extends Monitor<T>> newMonitor

Factory funtion used to create a new instance of a monitor.

monitors

protected final java.util.concurrent.ConcurrentMap<MonitorConfig,M extends Monitor<T>> monitors

Thread-safe map keeping track of the distinct monitors that have been created so far.

Constructor Detail

AbstractContextualMonitor

protected AbstractContextualMonitor(MonitorConfig baseConfig,
                         TaggingContext context,
                         com.google.common.base.Function<MonitorConfig,M> newMonitor)

Create a new instance of the monitor.

Parameters:

baseConfig - shared configuration

context - provider for context specific tags

newMonitor - function to create new monitors

Method Detail

getValue

public T getValue()

Returns the current value for the monitor for the default polling interval.

Specified by:

getValue in interface Monitor<T>

getMonitorForCurrentContext

protected M getMonitorForCurrentContext()

Returns a monitor instance for the current context. If no monitor exists for the current context then a new one will be created.

getConfig

public MonitorConfig getConfig()

Configuration used to identify a monitor and provide metadata used in aggregations.

Specified by:

getConfig in interface Monitor<T>

getMonitors

public java.util.List<Monitor<?>> getMonitors()

Returns a list of sub-monitors for this composite.

Specified by:

getMonitors in interface CompositeMonitor<T>