org.apache.commons.monitoring.impl.values
Class ThreadSafeCounter

java.lang.Object
  org.apache.commons.monitoring.impl.values.AbstractStatValue<Counter>
      org.apache.commons.monitoring.impl.values.ThreadSafeCounter

All Implemented Interfaces:

Counter, StatValue

Direct Known Subclasses:

CompositeCounter

public class ThreadSafeCounter
extends AbstractStatValue<Counter>
implements Counter

Thread-safe implementation of Counter, based on synchronized methods.

Author:

Nicolas De Loof

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.commons.monitoring.StatValue

StatValue.Listener

Constructor Summary

ThreadSafeCounter(Role<Counter> role)

Method Summary

void	add(long delta, Unit unit) Add value to the counter.
protected void	computeStats(long l)
long	get()
double	getMean()
protected long	getSquares()
long	getSum()
void	reset() reset the statValue
void	set(long l, Unit unit)

Methods inherited from class org.apache.commons.monitoring.impl.values.AbstractStatValue

addListener, fireValueChanged, getHits, getMax, getMin, getMonitor, getRole, getStandardDeviation, getUnit, normalize, removeListener, setMonitor

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.commons.monitoring.Counter

getHits

Methods inherited from interface org.apache.commons.monitoring.StatValue

addListener, getMax, getMin, getMonitor, getRole, getStandardDeviation, getUnit, removeListener, setMonitor

Constructor Detail

ThreadSafeCounter

public ThreadSafeCounter(Role<Counter> role)

Method Detail

get

public long get()

Specified by:

get in interface StatValue

Returns:

the value

reset

public void reset()

Description copied from interface: StatValue

reset the statValue

Specified by:

reset in interface StatValue

set

public void set(long l,
                Unit unit)

Specified by:

set in interface StatValue

Parameters:

l - the value to set

add

public void add(long delta,
                Unit unit)

Description copied from interface: Counter

Add value to the counter. Delta should not be negative (in such case a Gauge should be used).

Specified by:

add in interface Counter

computeStats

protected void computeStats(long l)

Overrides:

computeStats in class AbstractStatValue<Counter>

getMean

public double getMean()

Description copied from class: AbstractStatValue

Specified by:

getMean in interface StatValue

Specified by:

getMean in class AbstractStatValue<Counter>

Returns:

the arithmetic mean value

getSquares

protected long getSquares()

Specified by:

getSquares in class AbstractStatValue<Counter>

getSum

public long getSum()

Specified by:

getSum in interface Counter

Specified by:

getSum in class AbstractStatValue<Counter>

Returns:

the sum of all set operations