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Added in API level 1

Summary: Ctors | Methods | Inherited Methods | [Expand All]

AtomicStampedReference

public class AtomicStampedReference
extends Object

java.lang.Object
↳	java.util.concurrent.atomic.AtomicStampedReference<V>

An 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.

Summary

Public constructors
`AtomicStampedReference(V initialRef, int initialStamp)` Creates a new `AtomicStampedReference` with the given initial values.

Public methods
`boolean`	`attemptStamp(V expectedReference, int newStamp)` Atomically sets the value of the stamp to the given update value if the current reference is `==` to the expected reference.
`boolean`	`compareAndSet(V expectedReference, V newReference, int expectedStamp, int newStamp)` 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(int[] stampHolder)` 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(V newReference, int newStamp)` Unconditionally sets the value of both the reference and stamp.
`boolean`	`weakCompareAndSet(V expectedReference, V newReference, int expectedStamp, int newStamp)` 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.

Inherited methods

From class


  
    java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long millis, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void`	`wait(long millis)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void`	`wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

Public constructors

AtomicStampedReference

Added in API level 1

AtomicStampedReference (V initialRef, 
                int initialStamp)

Creates a new AtomicStampedReference with the given initial values.

Parameters
`initialRef`	`V`: the initial reference
`initialStamp`	`int`: the initial stamp

Public methods

attemptStamp

Added in API level 1

boolean attemptStamp (V expectedReference, 
                int newStamp)

Atomically sets the value of the stamp to the given update value if the current reference is == 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.

Parameters
`expectedReference`	`V`: the expected value of the reference
`newStamp`	`int`: the new value for the stamp

Returns
`boolean`	`true` if successful

compareAndSet

Added in API level 1

boolean compareAndSet (V expectedReference, 
                V newReference, 
                int expectedStamp, 
                int newStamp)

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.

Parameters
`expectedReference`	`V`: the expected value of the reference
`newReference`	`V`: the new value for the reference
`expectedStamp`	`int`: the expected value of the stamp
`newStamp`	`int`: the new value for the stamp

Returns
`boolean`	`true` if successful

get

Added in API level 1

V get (int[] stampHolder)

Returns the current values of both the reference and the stamp. Typical usage is int[1] holder; ref = v.get(holder); .

Parameters
`stampHolder`	`int`: an array of size of at least one. On return, `stampHolder[0]` will hold the value of the stamp.

Returns
`V`	the current value of the reference

getReference

Added in API level 1

V getReference ()

Returns the current value of the reference.

Returns
`V`	the current value of the reference

getStamp

Added in API level 1

int getStamp ()

Returns the current value of the stamp.

Returns
`int`	the current value of the stamp

set

Added in API level 1

void set (V newReference, 
                int newStamp)

Unconditionally sets the value of both the reference and stamp.

Parameters
`newReference`	`V`: the new value for the reference
`newStamp`	`int`: the new value for the stamp

weakCompareAndSet

Added in API level 1

boolean weakCompareAndSet (V expectedReference, 
                V newReference, 
                int expectedStamp, 
                int newStamp)

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.

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

Parameters
`expectedReference`	`V`: the expected value of the reference
`newReference`	`V`: the new value for the reference
`expectedStamp`	`int`: the expected value of the stamp
`newStamp`	`int`: the new value for the stamp

Returns
`boolean`	`true` if successful