net.sf.ehcache.util.counter.sampled

Class SampledCounterImpl

java.lang.Object

net.sf.ehcache.util.counter.CounterImpl

net.sf.ehcache.util.counter.sampled.SampledCounterImpl

All Implemented Interfaces:

Serializable, Counter, SampledCounter

Direct Known Subclasses:

SampledRateCounterImpl

public class SampledCounterImpl
extends CounterImpl
implements SampledCounter

An implementation of SampledCounter

Since:

1.7

Author:

Abhishek Sanoujam

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected CircularLossyQueue<TimeStampedCounterValue>	history The history of this counter
protected boolean	resetOnSample Should the counter reset on each sample?

Constructor Summary

Constructors

Constructor and Description
SampledCounterImpl(long intervalInSeconds, int historySize, boolean resetOnSample, long initValue, boolean sampleNow) Constructor accepting raw config values.
SampledCounterImpl(SampledCounterConfig config) todo GL how many threads is this creating? Constructor accepting a SampledCounterConfig

Method Summary

Modifier and Type	Method and Description
TimeStampedCounterValue[]	getAllSampleValues() Returns all samples in history
long	getAndReset() Returns the current value of the counter and resets it to 0
long	getIntervalMillis() Returns the sampling thread interval in millis
TimeStampedCounterValue	getMostRecentSample() Returns the most recent sampled value
TimerTask	getTimerTask() Returns the timer task for this sampled counter
void	shutdown() Shutdown this counter

Methods inherited from class net.sf.ehcache.util.counter.CounterImpl

decrement, decrement, getAndSet, getValue, increment, increment, setValue

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.sf.ehcache.util.counter.Counter

decrement, decrement, getAndSet, getValue, increment, increment, setValue

Field Detail

history

protected final CircularLossyQueue<TimeStampedCounterValue> history

The history of this counter

resetOnSample

protected final boolean resetOnSample

Should the counter reset on each sample?

Constructor Detail

SampledCounterImpl

public SampledCounterImpl(SampledCounterConfig config)

todo GL how many threads is this creating? Constructor accepting a SampledCounterConfig

Parameters:

config -

SampledCounterImpl

public SampledCounterImpl(long intervalInSeconds,
                          int historySize,
                          boolean resetOnSample,
                          long initValue,
                          boolean sampleNow)

Constructor accepting raw config values.

Parameters:

intervalInSeconds - sampling interval in seconds

historySize - size of history sample

resetOnSample - true to reset value on sample

initValue - initial value

sampleNow - true to record smaple immediately

Method Detail

getMostRecentSample

public TimeStampedCounterValue getMostRecentSample()

Returns the most recent sampled value

Specified by:

getMostRecentSample in interface SampledCounter

Returns:

Value of the most recent sampled value

getAllSampleValues

public TimeStampedCounterValue[] getAllSampleValues()

Returns all samples in history

Specified by:

getAllSampleValues in interface SampledCounter

Returns:

An array containing the TimeStampedCounterValue's

shutdown

public void shutdown()

Shutdown this counter

Specified by:

shutdown in interface SampledCounter

getTimerTask

public TimerTask getTimerTask()

Returns the timer task for this sampled counter

Returns:

the timer task for this sampled counter

getIntervalMillis

public long getIntervalMillis()

Returns the sampling thread interval in millis

Returns:

the sampling thread interval in millis

getAndReset

public long getAndReset()

Returns the current value of the counter and resets it to 0

Specified by:

getAndReset in interface SampledCounter

Returns:

current value of the counter