File	Doc	Category	Size	Date	Package
AtomicLongFieldUpdater.java	API Doc	Android 1.5 API	11004	Wed May 06 22:41:02 BST 2009	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 add the given value to current value. 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 set the value of the field of the given object managed by this Updater to the given updated value if the current value == the expected value. This method is guaranteed to be atomic with respect to other calls to compareAndSet and 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 obj is not an instance of the class possessing the field established in the constructor.
public long	decrementAndGet(T obj) Atomically decrement by one the current value. 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) Get the current value held in the field by the given object. param obj An object whose field to get return the current value
public long	getAndAdd(T obj, long delta) Atomically add the given value to current value. 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 decrement by one the current value. 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 increment by one the current value. 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) Set to the given value and return 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 increment by one the current value. 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 static java.util.concurrent.atomic.AtomicLongFieldUpdater	newUpdater(java.lang.Class tclass, java.lang.String fieldName) Creates 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) Set the field of the given object managed by this updater. This operation is guaranteed to act as a volatile store with respect to subsequent invocations of 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 set the value of the field of the given object managed by this Updater to the given updated value if the current value == the expected value. This method is guaranteed to be atomic with respect to other calls to compareAndSet and set, but not necessarily with respect to other changes in the field, and may fail spuriously. 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 obj is not an instance of the class possessing the field established in the constructor.