org.terracotta.counter
Class SimpleCounterImpl

java.lang.Object
  org.terracotta.counter.SimpleCounterImpl

All Implemented Interfaces:

Serializable, Counter, Statistic

Direct Known Subclasses:

BoundedCounter

public class SimpleCounterImpl
extends Object
implements Counter, Serializable

A simple non-clusterable atomic counter implementation.

See Also:

Serialized Form

Constructor Summary

SimpleCounterImpl()
Creates a new counter with an initial value of 0.

SimpleCounterImpl(long initialValue)
Creates a new counter with the given initial value.

Method Summary

long	decrement() Decrements the count by one.
long	decrement(long amount) Decrements the count by amount.
long	getAndReset() Performs an atomic getAndSet(0).
long	getAndSet(long newValue) Atomically sets the new value and returns the previous value.
long	getValue() Get the current value.
long	increment() Increments the count by one.
long	increment(long amount) Increments the count by amount.
void	setValue(long newValue) Set the count to the supplied value.

Methods inherited from class java.lang.Object

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

Constructor Detail

SimpleCounterImpl

public SimpleCounterImpl()

Creates a new counter with an initial value of 0.

SimpleCounterImpl

public SimpleCounterImpl(long initialValue)

Creates a new counter with the given initial value.

Parameters:

initialValue - initial value for the counter

Method Detail

increment

public long increment()

Description copied from interface: Counter

Increments the count by one.

Specified by:

increment in interface Counter

Returns:

the new count value

decrement

public long decrement()

Description copied from interface: Counter

Decrements the count by one.

Specified by:

decrement in interface Counter

Returns:

the new count value

getAndSet

public long getAndSet(long newValue)

Atomically sets the new value and returns the previous value.

Specified by:

getAndSet in interface Counter

Parameters:

newValue - value to set to

Returns:

the old value

getAndReset

public long getAndReset()

Performs an atomic getAndSet(0).

Specified by:

getAndReset in interface Statistic

getValue

public long getValue()

Description copied from interface: Statistic

Get the current value.

Specified by:

getValue in interface Statistic

increment

public long increment(long amount)

Description copied from interface: Counter

Increments the count by amount.

Specified by:

increment in interface Counter

Parameters:

amount - amount to increment by

Returns:

the new value

decrement

public long decrement(long amount)

Description copied from interface: Counter

Decrements the count by amount.

Specified by:

decrement in interface Counter

Parameters:

amount - amount to increment by

Returns:

the new value

setValue

public void setValue(long newValue)

Description copied from interface: Counter

Set the count to the supplied value.

Specified by:

setValue in interface Counter

Parameters:

newValue - value to set to