org.javasimon
Class NullCounter

java.lang.Object
  org.javasimon.NullSimon
      org.javasimon.NullCounter

All Implemented Interfaces:

Counter, HasAttributes, Simon

final class NullCounter
extends NullSimon
implements Counter

Null Counter implements Simon returned by the disabled Manager.getCounter(String). It extends NullSimon to satisfy Counter interface.

Author:

Richard "Virgo" Richter

Field Summary

(package private) static NullCounter

INSTANCE Internal singleton value of the null Counter.

Constructor Summary

private

NullCounter()

Method Summary

Counter	decrease() Decrements the counter by one.
Counter	decrease(long dec) Increments the counter by the specified value.
long	getCounter() Returns the current value of the counter.
long	getDecrementSum() Returns the sum of all decremented values (as a positive number).
long	getIncrementSum() Returns the sum of all incremented values.
long	getMax() Returns maximal value of counter.
long	getMaxTimestamp() Returns ms timestamp when the max value was reached.
long	getMin() Returns minimal value of counter.
long	getMinTimestamp() Returns ms timestamp when the min value was reached.
Counter	increase() Increments the counter by one.
Counter	increase(long inc) Increments the counter by the specified value.
NullCounter	reset() Resets the Simon values related to the measuring, timestamps and so on - usage timestamps, state, attributes are not affected.
CounterSample	sample() Samples Simon values and returns them in a Java Bean derived from Sample interface.
CounterSample	sampleAndReset() Samples Simon values and returns them in a Java Bean derived from Sample interface and resets the Simon.
Counter	set(long val) Sets the value of the counter to specified value.

Methods inherited from class org.javasimon.NullSimon

getAttribute, getAttribute, getAttributeNames, getCopyAsSortedMap, getFirstUsage, getChildren, getLastReset, getLastUsage, getName, getNote, getParent, getState, isEnabled, removeAttribute, setAttribute, setNote, setState, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.javasimon.Simon

getFirstUsage, getChildren, getLastReset, getLastUsage, getName, getNote, getParent, getState, isEnabled, setNote, setState

Methods inherited from interface org.javasimon.HasAttributes

getAttribute, getAttribute, getAttributeNames, getCopyAsSortedMap, removeAttribute, setAttribute

Field Detail

INSTANCE

static final NullCounter INSTANCE

Internal singleton value of the null Counter. Null Counter is never directly used in the client code, it is always hidden behind the Counter interface - only its behavior manifests to the client.

Constructor Detail

NullCounter

private NullCounter()

Method Detail

reset

public NullCounter reset()

Description copied from interface: Simon

Resets the Simon values related to the measuring, timestamps and so on - usage timestamps, state, attributes are not affected. Timestamp of the last reset can be obtained by the method Simon.getLastReset(). Reset is perfomed even for disabled Simons.

Specified by:

reset in interface Counter

Specified by:

reset in interface Simon

Overrides:

reset in class NullSimon

Returns:

returns this

set

public Counter set(long val)

Description copied from interface: Counter

Sets the value of the counter to specified value.

Specified by:

set in interface Counter

Parameters:

val - new counter value

Returns:

this

increase

public Counter increase()

Description copied from interface: Counter

Increments the counter by one.

Specified by:

increase in interface Counter

Returns:

this

decrease

public Counter decrease()

Description copied from interface: Counter

Decrements the counter by one.

Specified by:

decrease in interface Counter

Returns:

this

increase

public Counter increase(long inc)

Description copied from interface: Counter

Increments the counter by the specified value.

Specified by:

increase in interface Counter

Parameters:

inc - added value

Returns:

this

decrease

public Counter decrease(long dec)

Description copied from interface: Counter

Increments the counter by the specified value.

Specified by:

decrease in interface Counter

Parameters:

dec - subtracted value

Returns:

this

getCounter

public long getCounter()

Description copied from interface: Counter

Returns the current value of the counter.

Specified by:

getCounter in interface Counter

Returns:

counter value

getMin

public long getMin()

Description copied from interface: Counter

Returns minimal value of counter.

Specified by:

getMin in interface Counter

Returns:

maximal reached value

getMax

public long getMax()

Description copied from interface: Counter

Returns maximal value of counter.

Specified by:

getMax in interface Counter

Returns:

maximal reached value

getMaxTimestamp

public long getMaxTimestamp()

Description copied from interface: Counter

Returns ms timestamp when the max value was reached.

Specified by:

getMaxTimestamp in interface Counter

Returns:

ms timestamp of the max value incremented

getMinTimestamp

public long getMinTimestamp()

Description copied from interface: Counter

Returns ms timestamp when the min value was reached.

Specified by:

getMinTimestamp in interface Counter

Returns:

ms timestamp of the min value decremented

getIncrementSum

public long getIncrementSum()

Description copied from interface: Counter

Returns the sum of all incremented values. If incremented value was negative, sum is lowered by this value.

Specified by:

getIncrementSum in interface Counter

Returns:

sum of all incremented values

getDecrementSum

public long getDecrementSum()

Description copied from interface: Counter

Returns the sum of all decremented values (as a positive number). If decremented value was negative, sum is lowered by this value.

Specified by:

getDecrementSum in interface Counter

Returns:

sum of all decremented values

sample

public CounterSample sample()

Description copied from interface: Simon

Samples Simon values and returns them in a Java Bean derived from Sample interface.

Specified by:

sample in interface Counter

Specified by:

sample in interface Simon

Overrides:

sample in class NullSimon

Returns:

sample containing all Simon values

sampleAndReset

public CounterSample sampleAndReset()

Description copied from interface: Simon

Samples Simon values and returns them in a Java Bean derived from Sample interface and resets the Simon. Operation is synchronized to assure atomicity.

Specified by:

sampleAndReset in interface Counter

Specified by:

sampleAndReset in interface Simon

Overrides:

sampleAndReset in class NullSimon

Returns:

sample containing all Simon values