org.mapdb

Class Atomic.Integer

java.lang.Object

java.lang.Number

org.mapdb.Atomic.Integer

All Implemented Interfaces:

Serializable

Enclosing class:

Atomic

public static final class Atomic.Integer
extends Number

An int record that may be updated atomically. An Atomic@Integer is used in applications such as atomically incremented counters, and cannot be used as a replacement for an Integer. However, this class does extend Number to allow uniform access by tools and utilities that deal with numerically-based classes.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected Engine	engine
protected long	recid

Constructor Summary

Constructors

Constructor and Description
Atomic.Integer(Engine engine, long recid)

Method Summary

Methods

Modifier and Type	Method and Description
int	addAndGet(int delta) Atomically adds the given value to the current value.
boolean	compareAndSet(int expect, int update) Atomically sets the value to the given updated value if the current value == the expected value.
int	decrementAndGet() Atomically decrements by one the current value.
double	doubleValue()
float	floatValue()
int	get() Gets the current value.
int	getAndAdd(int delta) Atomically adds the given value to the current value.
int	getAndDecrement() Atomically decrements by one the current value.
int	getAndIncrement() Atomically increments by one the current value.
int	getAndSet(int newValue) Atomically sets to the given value and returns the old value.
long	getRecid()
int	incrementAndGet() Atomically increments by one the current value.
int	intValue()
long	longValue()
void	set(int newValue) Sets to the given value.
String	toString() Returns the String representation of the current value.

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

Field Detail

engine

protected final Engine engine

recid

protected final long recid

Constructor Detail

Atomic.Integer

public Atomic.Integer(Engine engine,
              long recid)

Method Detail

getRecid

public long getRecid()

Returns:

recid under which value is saved

get

public final int get()

Gets the current value.

Returns:

the current value

set

public final void set(int newValue)

Sets to the given value.

Parameters:

newValue - the new value

getAndSet

public final int getAndSet(int newValue)

Atomically sets to the given value and returns the old value.

Parameters:

newValue - the new value

Returns:

the previous value

compareAndSet

public final boolean compareAndSet(int expect,
                    int update)

Atomically sets the value to the given updated value if the current value == the expected value.

Parameters:

expect - the expected value

update - the new value

Returns:

true if successful. False return indicates that the actual value was not equal to the expected value.

getAndIncrement

public final int getAndIncrement()

Atomically increments by one the current value.

Returns:

the previous value

getAndDecrement

public final int getAndDecrement()

Atomically decrements by one the current value.

Returns:

the previous value

getAndAdd

public final int getAndAdd(int delta)

Atomically adds the given value to the current value.

Parameters:

delta - the value to add

Returns:

the previous value

incrementAndGet

public final int incrementAndGet()

Atomically increments by one the current value.

Returns:

the updated value

decrementAndGet

public final int decrementAndGet()

Atomically decrements by one the current value.

Returns:

the updated value

addAndGet

public final int addAndGet(int delta)

Atomically adds the given value to the current value.

Parameters:

delta - the value to add

Returns:

the updated value

toString

public String toString()

Returns the String representation of the current value.

Overrides:

toString in class Object

Returns:

the String representation of the current value.

intValue

public int intValue()

Specified by:

intValue in class Number

longValue

public long longValue()

Specified by:

longValue in class Number

floatValue

public float floatValue()

Specified by:

floatValue in class Number

doubleValue

public double doubleValue()

Specified by:

doubleValue in class Number