Serializable
public class AtomicIntegerArray extends Object implements Serializable
int
array in which elements may be updated atomically. See the VarHandle
specification for descriptions of the properties of atomic accesses.Constructor | Description |
---|---|
AtomicIntegerArray |
Creates a new AtomicIntegerArray of the given length, with all elements initially zero. |
AtomicIntegerArray |
Creates a new AtomicIntegerArray with the same length as, and all elements copied from, the given array. |
Modifier and Type | Method | Description |
---|---|---|
final int |
accumulateAndGet |
Atomically updates (with memory effects as specified by VarHandle.compareAndSet(java.lang.Object...) ) the element at index i with the results of applying the given function to the current and given values, returning the updated value. |
final int |
addAndGet |
Atomically adds the given value to the element at index i , with memory effects as specified by VarHandle.getAndAdd(java.lang.Object...) . |
final int |
compareAndExchange |
Atomically sets the element at index i to newValue if the element's current value, referred to as the witness value, == expectedValue , with memory effects as specified by VarHandle.compareAndExchange(java.lang.Object...) . |
final int |
compareAndExchangeAcquire |
Atomically sets the element at index i to newValue if the element's current value, referred to as the witness value, == expectedValue , with memory effects as specified by VarHandle.compareAndExchangeAcquire(java.lang.Object...) . |
final int |
compareAndExchangeRelease |
Atomically sets the element at index i to newValue if the element's current value, referred to as the witness value, == expectedValue , with memory effects as specified by VarHandle.compareAndExchangeRelease(java.lang.Object...) . |
final boolean |
compareAndSet |
Atomically sets the element at index i to
newValue if the element's current value == expectedValue , with memory effects as specified by VarHandle.compareAndSet(java.lang.Object...) . |
final int |
decrementAndGet |
Atomically decrements the value of the element at index i , with memory effects as specified by VarHandle.getAndAdd(java.lang.Object...) . |
final int |
get |
Returns the current value of the element at index i , with memory effects as specified by VarHandle.getVolatile(java.lang.Object...) . |
final int |
getAcquire |
Returns the current value of the element at index i , with memory effects as specified by VarHandle.getAcquire(java.lang.Object...) . |
final int |
getAndAccumulate |
Atomically updates (with memory effects as specified by VarHandle.compareAndSet(java.lang.Object...) ) the element at index i with the results of applying the given function to the current and given values, returning the previous value. |
final int |
getAndAdd |
Atomically adds the given value to the element at index i , with memory effects as specified by VarHandle.getAndAdd(java.lang.Object...) . |
final int |
getAndDecrement |
Atomically decrements the value of the element at index i , with memory effects as specified by VarHandle.getAndAdd(java.lang.Object...) . |
final int |
getAndIncrement |
Atomically increments the value of the element at index i , with memory effects as specified by VarHandle.getAndAdd(java.lang.Object...) . |
final int |
getAndSet |
Atomically sets the element at index i to
newValue and returns the old value, with memory effects as specified by VarHandle.getAndSet(java.lang.Object...) . |
final int |
getAndUpdate |
Atomically updates (with memory effects as specified by VarHandle.compareAndSet(java.lang.Object...) ) the element at index i with the results of applying the given function, returning the previous value. |
final int |
getOpaque |
Returns the current value of the element at index i , with memory effects as specified by VarHandle.getOpaque(java.lang.Object...) . |
final int |
getPlain |
Returns the current value of the element at index i , with memory semantics of reading as if the variable was declared non-volatile . |
final int |
incrementAndGet |
Atomically increments the value of the element at index i , with memory effects as specified by VarHandle.getAndAdd(java.lang.Object...) . |
final void |
lazySet |
Sets the element at index i to newValue , with memory effects as specified by VarHandle.setRelease(java.lang.Object...) . |
final int |
length() |
Returns the length of the array. |
final void |
set |
Sets the element at index i to newValue , with memory effects as specified by VarHandle.setVolatile(java.lang.Object...) . |
final void |
setOpaque |
Sets the element at index i to newValue , with memory effects as specified by VarHandle.setOpaque(java.lang.Object...) . |
final void |
setPlain |
Sets the element at index i to newValue , with memory semantics of setting as if the variable was declared non-volatile and non-final . |
final void |
setRelease |
Sets the element at index i to newValue , with memory effects as specified by VarHandle.setRelease(java.lang.Object...) . |
String |
toString() |
Returns the String representation of the current values of array. |
final int |
updateAndGet |
Atomically updates (with memory effects as specified by VarHandle.compareAndSet(java.lang.Object...) ) the element at index i with the results of applying the given function, returning the updated value. |
final boolean |
weakCompareAndSet |
Deprecated. |
final boolean |
weakCompareAndSetAcquire |
Possibly atomically sets the element at index i to newValue if the element's current value == expectedValue , with memory effects as specified by VarHandle.weakCompareAndSetAcquire(java.lang.Object...) . |
final boolean |
weakCompareAndSetPlain |
Possibly atomically sets the element at index i to newValue if the element's current value == expectedValue , with memory effects as specified by VarHandle.weakCompareAndSetPlain(java.lang.Object...) . |
final boolean |
weakCompareAndSetRelease |
Possibly atomically sets the element at index i to newValue if the element's current value == expectedValue , with memory effects as specified by VarHandle.weakCompareAndSetRelease(java.lang.Object...) . |
final boolean |
weakCompareAndSetVolatile |
Possibly atomically sets the element at index i to newValue if the element's current value == expectedValue , with memory effects as specified by VarHandle.weakCompareAndSet(java.lang.Object...) . |
public AtomicIntegerArray(int length)
length
- the length of the arraypublic AtomicIntegerArray(int[] array)
array
- the array to copy elements fromNullPointerException
- if array is nullpublic final int length()
public final int get(int i)
i
, with memory effects as specified by VarHandle.getVolatile(java.lang.Object...)
.i
- the indexpublic final void set(int i, int newValue)
i
to newValue
, with memory effects as specified by VarHandle.setVolatile(java.lang.Object...)
.i
- the indexnewValue
- the new valuepublic final void lazySet(int i, int newValue)
i
to newValue
, with memory effects as specified by VarHandle.setRelease(java.lang.Object...)
.i
- the indexnewValue
- the new valuepublic final int getAndSet(int i, int newValue)
i
to
newValue
and returns the old value, with memory effects as specified by VarHandle.getAndSet(java.lang.Object...)
.i
- the indexnewValue
- the new valuepublic final boolean compareAndSet(int i, int expectedValue, int newValue)
i
to
newValue
if the element's current value == expectedValue
, with memory effects as specified by VarHandle.compareAndSet(java.lang.Object...)
.i
- the indexexpectedValue
- the expected valuenewValue
- the new valuetrue
if successful. False return indicates that the actual value was not equal to the expected value.@Deprecated(since="9") public final boolean weakCompareAndSet(int i, int expectedValue, int newValue)
compareAndExchange(int, int, int)
and compareAndSet(int, int, int)
). To avoid confusion over plain or volatile memory effects it is recommended that the method weakCompareAndSetPlain(int, int, int)
be used instead.i
to newValue
if the element's current value == expectedValue
, with memory effects as specified by VarHandle.weakCompareAndSetPlain(java.lang.Object...)
.i
- the indexexpectedValue
- the expected valuenewValue
- the new valuetrue
if successfulpublic final boolean weakCompareAndSetPlain(int i, int expectedValue, int newValue)
i
to newValue
if the element's current value == expectedValue
, with memory effects as specified by VarHandle.weakCompareAndSetPlain(java.lang.Object...)
.i
- the indexexpectedValue
- the expected valuenewValue
- the new valuetrue
if successfulpublic final int getAndIncrement(int i)
i
, with memory effects as specified by VarHandle.getAndAdd(java.lang.Object...)
. Equivalent to getAndAdd(i, 1)
.
i
- the indexpublic final int getAndDecrement(int i)
i
, with memory effects as specified by VarHandle.getAndAdd(java.lang.Object...)
. Equivalent to getAndAdd(i, -1)
.
i
- the indexpublic final int getAndAdd(int i, int delta)
i
, with memory effects as specified by VarHandle.getAndAdd(java.lang.Object...)
.i
- the indexdelta
- the value to addpublic final int incrementAndGet(int i)
i
, with memory effects as specified by VarHandle.getAndAdd(java.lang.Object...)
. Equivalent to addAndGet(i, 1)
.
i
- the indexpublic final int decrementAndGet(int i)
i
, with memory effects as specified by VarHandle.getAndAdd(java.lang.Object...)
. Equivalent to addAndGet(i, -1)
.
i
- the indexpublic final int addAndGet(int i, int delta)
i
, with memory effects as specified by VarHandle.getAndAdd(java.lang.Object...)
.i
- the indexdelta
- the value to addpublic final int getAndUpdate(int i, IntUnaryOperator updateFunction)
VarHandle.compareAndSet(java.lang.Object...)
) 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.i
- the indexupdateFunction
- a side-effect-free functionpublic final int updateAndGet(int i, IntUnaryOperator updateFunction)
VarHandle.compareAndSet(java.lang.Object...)
) 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.i
- the indexupdateFunction
- a side-effect-free functionpublic final int getAndAccumulate(int i, int x, IntBinaryOperator accumulatorFunction)
VarHandle.compareAndSet(java.lang.Object...)
) 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 of the element at index i
as its first argument, and the given update as the second argument.i
- the indexx
- the update valueaccumulatorFunction
- a side-effect-free function of two argumentspublic final int accumulateAndGet(int i, int x, IntBinaryOperator accumulatorFunction)
VarHandle.compareAndSet(java.lang.Object...)
) 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 of the element at index i
as its first argument, and the given update as the second argument.i
- the indexx
- the update valueaccumulatorFunction
- a side-effect-free function of two argumentspublic String toString()
public final int getPlain(int i)
i
, with memory semantics of reading as if the variable was declared non-volatile
.i
- the indexpublic final void setPlain(int i, int newValue)
i
to newValue
, with memory semantics of setting as if the variable was declared non-volatile
and non-final
.i
- the indexnewValue
- the new valuepublic final int getOpaque(int i)
i
, with memory effects as specified by VarHandle.getOpaque(java.lang.Object...)
.i
- the indexpublic final void setOpaque(int i, int newValue)
i
to newValue
, with memory effects as specified by VarHandle.setOpaque(java.lang.Object...)
.i
- the indexnewValue
- the new valuepublic final int getAcquire(int i)
i
, with memory effects as specified by VarHandle.getAcquire(java.lang.Object...)
.i
- the indexpublic final void setRelease(int i, int newValue)
i
to newValue
, with memory effects as specified by VarHandle.setRelease(java.lang.Object...)
.i
- the indexnewValue
- the new valuepublic final int compareAndExchange(int i, int expectedValue, int newValue)
i
to newValue
if the element's current value, referred to as the witness value, == expectedValue
, with memory effects as specified by VarHandle.compareAndExchange(java.lang.Object...)
.i
- the indexexpectedValue
- the expected valuenewValue
- the new valuepublic final int compareAndExchangeAcquire(int i, int expectedValue, int newValue)
i
to newValue
if the element's current value, referred to as the witness value, == expectedValue
, with memory effects as specified by VarHandle.compareAndExchangeAcquire(java.lang.Object...)
.i
- the indexexpectedValue
- the expected valuenewValue
- the new valuepublic final int compareAndExchangeRelease(int i, int expectedValue, int newValue)
i
to newValue
if the element's current value, referred to as the witness value, == expectedValue
, with memory effects as specified by VarHandle.compareAndExchangeRelease(java.lang.Object...)
.i
- the indexexpectedValue
- the expected valuenewValue
- the new valuepublic final boolean weakCompareAndSetVolatile(int i, int expectedValue, int newValue)
i
to newValue
if the element's current value == expectedValue
, with memory effects as specified by VarHandle.weakCompareAndSet(java.lang.Object...)
.i
- the indexexpectedValue
- the expected valuenewValue
- the new valuetrue
if successfulpublic final boolean weakCompareAndSetAcquire(int i, int expectedValue, int newValue)
i
to newValue
if the element's current value == expectedValue
, with memory effects as specified by VarHandle.weakCompareAndSetAcquire(java.lang.Object...)
.i
- the indexexpectedValue
- the expected valuenewValue
- the new valuetrue
if successfulpublic final boolean weakCompareAndSetRelease(int i, int expectedValue, int newValue)
i
to newValue
if the element's current value == expectedValue
, with memory effects as specified by VarHandle.weakCompareAndSetRelease(java.lang.Object...)
.i
- the indexexpectedValue
- the expected valuenewValue
- the new valuetrue
if successful
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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
Various third party code in OpenJDK is licensed under different licenses (see Debian package).
Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.
https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/concurrent/atomic/AtomicIntegerArray.html
compareAndExchange(int, int, int)
andcompareAndSet(int, int, int)
).