java.util.concurrent.atomic
Class AtomicReferenceArray<E>

java.lang.Object
  java.util.concurrent.atomic.AtomicReferenceArray<E>

Type Parameters:

E - The base class of elements held in this array

All Implemented Interfaces:

Serializable

public class AtomicReferenceArray<E>
extends Object
implements Serializable

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

Since:

1.5

See Also:

Serialized Form

Method Summary
boolean	compareAndSet (int i, E  expect, E           Atomically sets the element at position i to the given updated value if the current value == the expected value.
E	get (int i)           Gets the current value at position i. i .
E	getAndSet (int i, E           Atomically sets the element at position i to the given value and returns the old value.
void	lazySet (int i, E           Eventually sets the element at position i to the given value.
int	length ()           Returns the length of the array.
void	set (int i, E           Sets the element at position i to the given value.
String	toString ()           Returns the String representation of the current values of array.
boolean	weakCompareAndSet (int i, E  expect, E           Atomically sets the element at position i to the given updated value if the current value == the expected value.

AtomicReferenceArray

public AtomicReferenceArray(int length)

Creates a new AtomicReferenceArray of given length.

Parameters:

length - the length of the array

AtomicReferenceArray

public AtomicReferenceArray(E[] array)

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

Parameters:

array - the array to copy elements from

Throws:

NullPointerException - if array is null

length

public final int length()

Returns the length of the array.

Returns:

the length of the array

get

public final E get(int i)

Gets the current value at position i. i .

Parameters:

i - the index

Returns:

the current value

set

public final void set(int i,
                      E newValue)

Sets the element at position i to the given value.

Parameters:

i - the index

newValue - the new value

lazySet

public final void lazySet(int i,
                          E newValue)

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

Parameters:

i - the index

newValue - the new value

Since:

1.6

getAndSet

public final E getAndSet(int i,
                         E newValue)

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

Parameters:

i - the index

newValue - the new value

Returns:

the previous value

compareAndSet

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

Atomically sets the element at position i to the given updated value if the current value == the expected value.

Parameters:

i - the index

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.

weakCompareAndSet

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

Atomically sets the element at position i to the given updated value if the current value == the expected value. May fail spuriously.

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

Parameters:

i - the index

expect - the expected value

update - the new value

Returns:

true if successful.

toString

public String toString()

Returns the String representation of the current values of array.

Overrides:

toString in class Object

Returns:

the String representation of the current values of array.