com.netflix.servo.monitor

Class NumberGauge

java.lang.Object

com.netflix.servo.monitor.AbstractMonitor<java.lang.Number>

com.netflix.servo.monitor.NumberGauge

All Implemented Interfaces:

Gauge<java.lang.Number>, Monitor<java.lang.Number>, NumericMonitor<java.lang.Number>

Direct Known Subclasses:

DoubleGauge, LongGauge

public class NumberGauge
extends AbstractMonitor<java.lang.Number>
implements Gauge<java.lang.Number>

A Gauge that returns the value stored in Number.

Field Summary

Fields inherited from class com.netflix.servo.monitor.AbstractMonitor

config

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	NumberGauge(MonitorConfig config) Construct a gauge that will store a weak reference to a number.
	NumberGauge(MonitorConfig config, java.lang.Number number) Construct a gauge that will store a weak reference to the number.

Method Summary

Modifier and Type	Method and Description
boolean	equals(java.lang.Object o)
protected java.lang.Number	getBackingNumber() Returns the Number hold or null if it has been garbage collected.
java.lang.Number	getValue(int pollerIdx) Returns the current value for the monitor for the nth poller.
int	hashCode()
protected void	setBackingNumber(java.lang.Number number) Sets a new Number to hold.
java.lang.String	toString()

Methods inherited from class com.netflix.servo.monitor.AbstractMonitor

getConfig, getValue

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

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

getConfig, getValue

Constructor Detail

NumberGauge

protected NumberGauge(MonitorConfig config)

Construct a gauge that will store a weak reference to a number. The number should be set by the subclass immediately after the call to super(config); using the setBackingNumber(Number) method.

NumberGauge

public NumberGauge(MonitorConfig config,
                   java.lang.Number number)

Construct a gauge that will store a weak reference to the number. The value returned by the monitor will be the value stored in number or Double.NaN in case the referred Number has been garbage collected.

Method Detail

getValue

public java.lang.Number getValue(int pollerIdx)

Returns the current value for the monitor for the nth poller.

Specified by:

getValue in interface Monitor<java.lang.Number>

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

getBackingNumber

protected java.lang.Number getBackingNumber()

Returns the Number hold or null if it has been garbage collected.

setBackingNumber

protected void setBackingNumber(java.lang.Number number)

Sets a new Number to hold. We keep a week reference to this value allowing it to be GC.