AtomicLongArray documentation

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java.util.concurrent.atomic

Class AtomicLongArray

public class AtomicLongArray
implements Serializable

A long array in which elements may be updated atomically. See the java.util.concurrent.atomic package specification for description of the properties of atomic variables.

Since1.5

VersionNot specified.

AuthorDoug Lea

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Constructor Summary
AtomicLongArray( int length ) Creates a new AtomicLongArray of given length.
AtomicLongArray( long [] array ) Creates a new AtomicLongArray with the same length as, and all elements copied from, the given array.

Method Summary
long	addAndGet( int i, long delta ) Atomically adds the given value to the element at index i .
final boolean	compareAndSet( int i, long expect, long update ) Atomically sets the value to the given updated value if the current value == the expected value.
final long	decrementAndGet( int i ) Atomically decrements by one the element at index i .
final long	get( int i ) Gets the current value at position i .
final long	getAndAdd( int i, long delta ) Atomically adds the given value to the element at index i .
final long	getAndDecrement( int i ) Atomically decrements by one the element at index i .
final long	getAndIncrement( int i ) Atomically increments by one the element at index i .
final long	getAndSet( int i, long newValue ) Atomically sets the element at position i to the given value and returns the old value.
final long	incrementAndGet( int i ) Atomically increments by one the element at index i .
final void	lazySet( int i, long newValue ) Eventually sets the element at position i to the given value.
final int	length() Returns the length of the array.
final void	set( int i, long newValue ) Sets the element at position i to the given value.
String	toString() Returns the String representation of the current values of array.
final boolean	weakCompareAndSet( int i, long expect, long update ) Atomically sets the value to the given updated value if the current value == the expected value.

Methods inherited from java.langObject
clone () equals (Object) finalize () getClass () hashCode () notify () notifyAll () wait () wait (long, int) wait (long)

Constructor Detail

AtomicLongArray

public AtomicLongArray ( int length )

Creates a new AtomicLongArray of given length.

Parameters

Type	Name	Description
int	length	the length of the array

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AtomicLongArray

public AtomicLongArray ( long [] array )

Creates a new AtomicLongArray with the same length as, and all elements copied from, the given array.

Parameters

Type	Name	Description
long[]	array	the array to copy elements from

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Method Detail

addAndGet

public long addAndGet ( int i, long delta )

Atomically adds the given value to the element at index i .

Parameters

Type	Name	Description
int	i	the index
long	delta	the value to add

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compareAndSet

public final boolean compareAndSet ( int i, long expect, long update )

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

Parameters

Type	Name	Description
int	i	the index
long	expect	the expected value
long	update	the new value

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decrementAndGet

public final long decrementAndGet ( int i )

Atomically decrements by one the element at index i .

Parameters

Type	Name	Description
int	i	the index

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get

public final long get ( int i )

Gets the current value at position i .

Parameters

Type	Name	Description
int	i	the index

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getAndAdd

public final long getAndAdd ( int i, long delta )

Atomically adds the given value to the element at index i .

Parameters

Type	Name	Description
int	i	the index
long	delta	the value to add

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getAndDecrement

public final long getAndDecrement ( int i )

Atomically decrements by one the element at index i .

Parameters

Type	Name	Description
int	i	the index

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getAndIncrement

public final long getAndIncrement ( int i )

Atomically increments by one the element at index i .

Parameters

Type	Name	Description
int	i	the index

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getAndSet

public final long getAndSet ( int i, long newValue )

Atomically sets the element at position i to the given value and returns the old value.

Parameters

Type	Name	Description
int	i	the index
long	newValue	the new value

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incrementAndGet

public final long incrementAndGet ( int i )

Atomically increments by one the element at index i .

Parameters

Type	Name	Description
int	i	the index

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lazySet

public final void lazySet ( int i, long newValue )

Eventually sets the element at position i to the given value.

Since: 1.6

Parameters

Type	Name	Description
int	i	the index
long	newValue	the new value

Returns void No description provided.

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length

public final int length ( )

Returns the length of the array.

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set

public final void set ( int i, long newValue )

Sets the element at position i to the given value.

Parameters

Type	Name	Description
int	i	the index
long	newValue	the new value

Returns void No description provided.

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toString

public String toString ( )

Returns the String representation of the current values of array.

Overrides method in Object

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weakCompareAndSet

public final boolean weakCompareAndSet ( int i, long expect, long update )

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

May fail spuriously and does not provide ordering guarantees, so is only rarely an appropriate alternative to compareAndSet .

Parameters

Type	Name	Description
int	i	the index
long	expect	the expected value
long	update	the new value

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