File	Doc	Category	Size	Date	Package
AtomicLongFieldUpdater.java	API Doc	Java SE 6 API	14228	Tue Jun 10 00:25:58 BST 2008	java.util.concurrent.atomic

AtomicLongFieldUpdater

• java.lang.Object

Fields Summary

Constructors Summary
protected AtomicLongFieldUpdater() Protected do-nothing constructor for use by subclasses.

Methods Summary
public long	addAndGet(T obj, long delta) Atomically adds the given value to the current value of the field of the given object managed by this updater. param obj An object whose field to get and set param delta the value to add return the updated value for (;;) { long current = get(obj); long next = current + delta; if (compareAndSet(obj, current, next)) return next; }
public abstract boolean	compareAndSet(T obj, long expect, long update) Atomically sets the field of the given object managed by this updater to the given updated value if the current value {@code ==} the expected value. This method is guaranteed to be atomic with respect to other calls to {@code compareAndSet} and {@code set}, but not necessarily with respect to other changes in the field. param obj An object whose field to conditionally set param expect the expected value param update the new value return true if successful. throws ClassCastException if {@code obj} is not an instance of the class possessing the field established in the constructor.
public long	decrementAndGet(T obj) Atomically decrements by one the current value of the field of the given object managed by this updater. param obj An object whose field to get and set return the updated value for (;;) { long current = get(obj); long next = current - 1; if (compareAndSet(obj, current, next)) return next; }
public abstract long	get(T obj) Gets the current value held in the field of the given object managed by this updater. param obj An object whose field to get return the current value
public long	getAndAdd(T obj, long delta) Atomically adds the given value to the current value of the field of the given object managed by this updater. param obj An object whose field to get and set param delta the value to add return the previous value for (;;) { long current = get(obj); long next = current + delta; if (compareAndSet(obj, current, next)) return current; }
public long	getAndDecrement(T obj) Atomically decrements by one the current value of the field of the given object managed by this updater. param obj An object whose field to get and set return the previous value for (;;) { long current = get(obj); long next = current - 1; if (compareAndSet(obj, current, next)) return current; }
public long	getAndIncrement(T obj) Atomically increments by one the current value of the field of the given object managed by this updater. param obj An object whose field to get and set return the previous value for (;;) { long current = get(obj); long next = current + 1; if (compareAndSet(obj, current, next)) return current; }
public long	getAndSet(T obj, long newValue) Atomically sets the field of the given object managed by this updater to the given value and returns the old value. param obj An object whose field to get and set param newValue the new value return the previous value for (;;) { long current = get(obj); if (compareAndSet(obj, current, newValue)) return current; }
public long	incrementAndGet(T obj) Atomically increments by one the current value of the field of the given object managed by this updater. param obj An object whose field to get and set return the updated value for (;;) { long current = get(obj); long next = current + 1; if (compareAndSet(obj, current, next)) return next; }
public abstract void	lazySet(T obj, long newValue) Eventually sets the field of the given object managed by this updater to the given updated value. param obj An object whose field to set param newValue the new value since 1.6
public static java.util.concurrent.atomic.AtomicLongFieldUpdater	newUpdater(java.lang.Class tclass, java.lang.String fieldName) Creates and returns an updater for objects with the given field. The Class argument is needed to check that reflective types and generic types match. param tclass the class of the objects holding the field param fieldName the name of the field to be updated. return the updater throws IllegalArgumentException if the field is not a volatile long type. throws RuntimeException with a nested reflection-based exception if the class does not hold field or is the wrong type. if (AtomicLong.VM_SUPPORTS_LONG_CAS) return new CASUpdater<U>(tclass, fieldName); else return new LockedUpdater<U>(tclass, fieldName);
public abstract void	set(T obj, long newValue) Sets the field of the given object managed by this updater to the given updated value. This operation is guaranteed to act as a volatile store with respect to subsequent invocations of {@code compareAndSet}. param obj An object whose field to set param newValue the new value
public abstract boolean	weakCompareAndSet(T obj, long expect, long update) Atomically sets the field of the given object managed by this updater to the given updated value if the current value {@code ==} the expected value. This method is guaranteed to be atomic with respect to other calls to {@code compareAndSet} and {@code set}, but not necessarily with respect to other changes in the field. May fail spuriously and does not provide ordering guarantees, so is only rarely an appropriate alternative to {@code compareAndSet}. param obj An object whose field to conditionally set param expect the expected value param update the new value return true if successful. throws ClassCastException if {@code obj} is not an instance of the class possessing the field established in the constructor.