org.terracotta.statistics.extended
Class SemiExpiringSampledStatistic<T extends Number>

java.lang.Object
  org.terracotta.statistics.extended.SemiExpiringSampledStatistic<T>

Type Parameters:

T - statistic type

All Implemented Interfaces:

SampledStatistic<T>, SamplingSupport

Direct Known Subclasses:

ExpiringSampledStatistic

public class SemiExpiringSampledStatistic<T extends Number>
extends Object
implements SamplingSupport

Statistic implementation that stops sampling history if the last history access is before a user supplied timestamp.

Author:

Chris Dennis

Constructor Summary

SemiExpiringSampledStatistic(ValueStatistic<T> source, ScheduledExecutorService executor, int historySize, long historyTime, TimeUnit historyTimeUnit)
Creates a new semi-expiring statistic.

Method Summary

boolean	active() Active.
boolean	expire(long expiry) Expire.
List<Timestamped<T>>	history() History.
void	setAlwaysOn(boolean enable)
protected void	start() Start.
protected void	startStatistic() Start statistic.
protected void	stopStatistic() Stop statistic.
protected void	touch() Touch.
T	value() Value.

Methods inherited from class java.lang.Object

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

Constructor Detail

SemiExpiringSampledStatistic

public SemiExpiringSampledStatistic(ValueStatistic<T> source,
                                    ScheduledExecutorService executor,
                                    int historySize,
                                    long historyTime,
                                    TimeUnit historyTimeUnit)

Creates a new semi-expiring statistic.

Parameters:

source - statistic source

executor - executor to use for sampling

historySize - size of sample history

historyTime - period between samples

historyTimeUnit - unit of period between samples

Method Detail

history

public List<Timestamped<T>> history()

History.

Specified by:

history in interface SampledStatistic<T extends Number>

Returns:

the list

active

public final boolean active()

Description copied from interface: SampledStatistic

Active.

Specified by:

active in interface SampledStatistic<T extends Number>

Returns:

true, if successful

touch

protected final void touch()

Touch.

start

protected final void start()

Start.

expire

public final boolean expire(long expiry)

Expire.

Specified by:

expire in interface SamplingSupport

Parameters:

expiry - the expiry

Returns:

true, if successful

setAlwaysOn

public void setAlwaysOn(boolean enable)

Specified by:

setAlwaysOn in interface SamplingSupport

stopStatistic

protected void stopStatistic()

Stop statistic.

startStatistic

protected void startStatistic()

Start statistic.

value

public T value()

Value.

Specified by:

value in interface SampledStatistic<T extends Number>

Returns:

the t