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.
Public Constructor Summary
AtomicReferenceArray(int length)
Creates a new AtomicReferenceArray of the given length, with all
elements initially null.
|
|
AtomicReferenceArray(E[] array)
Creates a new AtomicReferenceArray with the same length as, and
all elements copied from, the given array.
|
Public Method Summary
final E |
accumulateAndGet(int i, E x, BinaryOperator<E> accumulatorFunction)
Atomically updates the element at index
i with the
results of applying the given function to the current and
given values, returning the updated value. |
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. |
final E |
get(int i)
Gets the current value at position
i . |
final E |
getAndAccumulate(int i, E x, BinaryOperator<E> accumulatorFunction)
Atomically updates the element at index
i with the
results of applying the given function to the current and
given values, returning the previous value. |
final E |
getAndSet(int i, E newValue)
Atomically sets the element at position
i to the given
value and returns the old value. |
final E |
getAndUpdate(int i, UnaryOperator<E> updateFunction)
Atomically updates the element at index
i with the results
of applying the given function, returning the previous value. |
final void |
lazySet(int i, E 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, E newValue)
Sets the element at position
i to the given value. |
String |
toString()
Returns the String representation of the current values of array.
|
final E |
updateAndGet(int i, UnaryOperator<E> updateFunction)
Atomically updates the element at index
i with the results
of applying the given function, returning the updated value. |
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. |
Inherited Method Summary
Public Constructors
public AtomicReferenceArray (int length)
Creates a new AtomicReferenceArray of the given length, with all elements initially null.
Parameters
length | the length of the array |
---|
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 |
---|
Public Methods
public final E accumulateAndGet (int i, E x, BinaryOperator<E> accumulatorFunction)
Atomically updates the element at index i
with the
results of applying the given function to the current and
given values, returning the updated value. The function should
be side-effect-free, since it may be re-applied when attempted
updates fail due to contention among threads. The function is
applied with the current value at index i
as its first
argument, and the given update as the second argument.
Parameters
i | the index |
---|---|
x | the update value |
accumulatorFunction | a side-effect-free function of two arguments |
Returns
- the updated value
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.
public final E get (int i)
Gets the current value at position i
.
Parameters
i | the index |
---|
Returns
- the current value
public final E getAndAccumulate (int i, E x, BinaryOperator<E> accumulatorFunction)
Atomically updates the element at index i
with the
results of applying the given function to the current and
given values, returning the previous value. The function should
be side-effect-free, since it may be re-applied when attempted
updates fail due to contention among threads. The function is
applied with the current value at index i
as its first
argument, and the given update as the second argument.
Parameters
i | the index |
---|---|
x | the update value |
accumulatorFunction | a side-effect-free function of two arguments |
Returns
- the previous value
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
public final E getAndUpdate (int i, UnaryOperator<E> updateFunction)
Atomically updates the element at index i
with the results
of applying the given function, returning the previous value. The
function should be side-effect-free, since it may be re-applied
when attempted updates fail due to contention among threads.
Parameters
i | the index |
---|---|
updateFunction | a side-effect-free function |
Returns
- the previous value
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 |
public final int length ()
Returns the length of the array.
Returns
- the length of the array
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 |
public String toString ()
Returns the String representation of the current values of array.
Returns
- the String representation of the current values of array
public final E updateAndGet (int i, UnaryOperator<E> updateFunction)
Atomically updates the element at index i
with the results
of applying the given function, returning the updated value. The
function should be side-effect-free, since it may be re-applied
when attempted updates fail due to contention among threads.
Parameters
i | the index |
---|---|
updateFunction | a side-effect-free function |
Returns
- the updated value
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 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