Package org.apache.camel.management.mbean

Class Statistic

java.lang.Object

org.apache.camel.management.mbean.Statistic

Direct Known Subclasses:

StatisticCounter, StatisticDelta, StatisticMaximum, StatisticMinimum, StatisticValue

public abstract class Statistic
extends Object

Base implementation of Statistic

The following modes is available:

• VALUE - A statistic with this update mode is a simple value that is a straight forward representation of the updated value.
• DELTA - A statistic with this update mode is a value that represents the delta between the last two recorded values (or the initial value if two updates have not been recorded). This value can be negative if the delta goes up or down.
• COUNTER - A statistic with this update mode interprets updates as increments (positive values) or decrements (negative values) to the current value.
• MAXIMUM - A statistic with this update mode is a value that represents the maximum value amongst the update values applied to this statistic.
• MINIMUM - A statistic with this update mode is a value that represents the minimum value amongst the update values applied to this statistic.
The MAXIMUM and MINIMUM modes are not 100% thread-safe as there can be a lost-update problem. This is on purpose because the performance overhead to ensure atomic updates costs to much on CPU and memory footprint. The other modes are thread-safe.

Constructor Summary

Constructors

Constructor	Description
Statistic()

Method Summary

Modifier and Type	Method	Description
void	decrement()
abstract long	getValue()
void	increment()
abstract boolean	isUpdated()	Whether the statistic has been updated one or more times.
abstract void	reset()
abstract void	updateValue(long newValue)

Methods inherited from class java.lang.Object

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

Constructor Detail

Statistic

public Statistic()

Method Detail

updateValue

public abstract void updateValue(long newValue)

increment

public void increment()

decrement

public void decrement()

getValue

public abstract long getValue()

isUpdated

public abstract boolean isUpdated()

Whether the statistic has been updated one or more times. Notice this is only working for value, maximum and minimum modes.

reset

public abstract void reset()