V - The type of object referred to by this referencepublic class AtomicStampedReference<V> extends Object
AtomicStampedReference maintains an object reference along with an integer "stamp", that can be updated atomically. Implementation note: This implementation maintains stamped references by creating internal objects representing "boxed" [reference, integer] pairs.
| Constructor | Description |
|---|---|
AtomicStampedReference |
Creates a new AtomicStampedReference with the given initial values. |
| Modifier and Type | Method | Description |
|---|---|---|
boolean |
attemptStamp |
Atomically sets the value of the stamp to the given update value if the current reference is == to the expected reference. |
boolean |
compareAndSet |
Atomically sets the value of both the reference and stamp to the given update values if the current reference is == to the expected reference and the current stamp is equal to the expected stamp. |
V |
get |
Returns the current values of both the reference and the stamp. |
V |
getReference() |
Returns the current value of the reference. |
int |
getStamp() |
Returns the current value of the stamp. |
void |
set |
Unconditionally sets the value of both the reference and stamp. |
boolean |
weakCompareAndSet |
Atomically sets the value of both the reference and stamp to the given update values if the current reference is == to the expected reference and the current stamp is equal to the expected stamp. |
public AtomicStampedReference(V initialRef, int initialStamp)
AtomicStampedReference with the given initial values.initialRef - the initial referenceinitialStamp - the initial stamppublic V getReference()
public int getStamp()
public V get(int[] stampHolder)
int[1] holder; ref = v.get(holder); .stampHolder - an array of size of at least one. On return, stampHolder[0] will hold the value of the stamp.public boolean weakCompareAndSet(V expectedReference, V newReference, int expectedStamp, int newStamp)
== to the expected reference and the current stamp is equal to the expected stamp. This operation may fail spuriously and does not provide ordering guarantees, so is only rarely an appropriate alternative to compareAndSet.expectedReference - the expected value of the referencenewReference - the new value for the referenceexpectedStamp - the expected value of the stampnewStamp - the new value for the stamptrue if successfulpublic boolean compareAndSet(V expectedReference, V newReference, int expectedStamp, int newStamp)
== to the expected reference and the current stamp is equal to the expected stamp.expectedReference - the expected value of the referencenewReference - the new value for the referenceexpectedStamp - the expected value of the stampnewStamp - the new value for the stamptrue if successfulpublic void set(V newReference, int newStamp)
newReference - the new value for the referencenewStamp - the new value for the stamppublic boolean attemptStamp(V expectedReference, int newStamp)
== to the expected reference. Any given invocation of this operation may fail (return false) spuriously, but repeated invocation when the current value holds the expected value and no other thread is also attempting to set the value will eventually succeed.expectedReference - the expected value of the referencenewStamp - the new value for the stamptrue if successful
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https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/concurrent/atomic/AtomicStampedReference.html