File	Doc	Category	Size	Date	Package
AtomicIntegerFieldUpdater.java	API Doc	Java SE 5 API	9970	Fri Aug 26 14:57:26 BST 2005	java.util.concurrent.atomic

AtomicIntegerFieldUpdater

• java.lang.Object

Fields Summary

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

Methods Summary
public int	addAndGet(T obj, int 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 (;;) { int current = get(obj); int next = current + delta; if (compareAndSet(obj, current, next)) return next; }
public abstract boolean	compareAndSet(T obj, int expect, int 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 int	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 (;;) { int current = get(obj); int next = current - 1; if (compareAndSet(obj, current, next)) return next; }
public abstract int	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 int	getAndAdd(T obj, int 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 (;;) { int current = get(obj); int next = current + delta; if (compareAndSet(obj, current, next)) return current; }
public int	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 (;;) { int current = get(obj); int next = current - 1; if (compareAndSet(obj, current, next)) return current; }
public int	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 (;;) { int current = get(obj); int next = current + 1; if (compareAndSet(obj, current, next)) return current; }
public int	getAndSet(T obj, int 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 (;;) { int current = get(obj); if (compareAndSet(obj, current, newValue)) return current; }
public int	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 (;;) { int current = get(obj); int next = current + 1; if (compareAndSet(obj, current, next)) return next; }
public static java.util.concurrent.atomic.AtomicIntegerFieldUpdater	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 integer type. throws RuntimeException with a nested reflection-based exception if the class does not hold field or is the wrong type. return new AtomicIntegerFieldUpdaterImpl<U>(tclass, fieldName);
public abstract void	set(T obj, int 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, int expect, int 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.