org.exoplatform.commons.utils
Class AtomicPositiveLong

java.lang.Object
  java.lang.Number
      java.util.concurrent.atomic.AtomicLong
          org.exoplatform.commons.utils.AtomicPositiveLong

All Implemented Interfaces:

java.io.Serializable

public class AtomicPositiveLong
extends java.util.concurrent.atomic.AtomicLong

Extends the @link{AtomicLong} to contain positive longs. If no initial value is provided when the object is created then the value is -1 to indicate that it is not yet initialized.

Version:

$Revision$

Author:

Julien Viet

See Also:

Serialized Form

Constructor Summary

AtomicPositiveLong()
Create an atomic positive long with no initial value.

AtomicPositiveLong(long initialValue)
Create an atomic positive long with an inital provided value.

Method Summary

void	setIfGreater(long newValue) Update the value if the new value is greater than the previous one or if the long is not initialized.
void	setIfLower(long newValue) Update the value if the new value is lower than the previous one or if the long is not initialized.

Methods inherited from class java.util.concurrent.atomic.AtomicLong

addAndGet, compareAndSet, decrementAndGet, doubleValue, floatValue, get, getAndAdd, getAndDecrement, getAndIncrement, getAndSet, incrementAndGet, intValue, longValue, set, toString, weakCompareAndSet

Methods inherited from class java.lang.Number

byteValue, shortValue

Methods inherited from class java.lang.Object

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

Constructor Detail

AtomicPositiveLong

public AtomicPositiveLong(long initialValue)
                   throws java.lang.IllegalArgumentException

Create an atomic positive long with an inital provided value.

Parameters:

initialValue - the initial value

Throws:

java.lang.IllegalArgumentException - if the value is negative

AtomicPositiveLong

public AtomicPositiveLong()

Create an atomic positive long with no initial value.

Method Detail

setIfGreater

public void setIfGreater(long newValue)
                  throws java.lang.IllegalArgumentException

Update the value if the new value is greater than the previous one or if the long is not initialized.

Parameters:

newValue - the new value

Throws:

java.lang.IllegalArgumentException - if the new value is negative

setIfLower

public void setIfLower(long newValue)
                throws java.lang.IllegalArgumentException

Update the value if the new value is lower than the previous one or if the long is not initialized.

Parameters:

newValue - the new value

Throws:

java.lang.IllegalArgumentException - if the new value is negative