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Java Source Code / Java Documentation » Apache Harmony Java SE » java package » java.util.concurrent.atomic 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   java.util.concurrent.atomic.AtomicLongFieldUpdater

AtomicLongFieldUpdater
abstract public class AtomicLongFieldUpdater (Code)
A reflection-based utility that enables atomic updates to designated volatile long fields of designated classes. This class is designed for use in atomic data structures in which several fields of the same node are independently subject to atomic updates.

Note that the guarantees of the compareAndSet method in this class are weaker than in other atomic classes. Because this class cannot ensure that all uses of the field are appropriate for purposes of atomic access, it can guarantee atomicity and volatile semantics only with respect to other invocations of compareAndSet and set.
since:
   1.5
author:
   Doug Lea<
Parameters:
  T - > The type of the object holding the updatable field




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

Method Summary
public  longaddAndGet(T obj, long delta)
     Atomically add the given value to current value.
abstract public  booleancompareAndSet(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.
public  longdecrementAndGet(T obj)
     Atomically decrement by one the current value.
abstract public  longget(T obj)
     Get the current value held in the field by the given object.
public  longgetAndAdd(T obj, long delta)
     Atomically add the given value to current value.
public  longgetAndDecrement(T obj)
     Atomically decrement by one the current value.
public  longgetAndIncrement(T obj)
     Atomically increment by one the current value.
public  longgetAndSet(T obj, long newValue)
     Set to the given value and return the old value.
public  longincrementAndGet(T obj)
     Atomically increment by one the current value.
public static  AtomicLongFieldUpdater<U>newUpdater(Class<U> tclass, String fieldName)
     Creates an updater for objects with the given field.
abstract public  voidset(T obj, long newValue)
     Set the field of the given object managed by this updater.
abstract public  booleanweakCompareAndSet(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.


Constructor Detail
AtomicLongFieldUpdater
protected AtomicLongFieldUpdater()(Code)
Protected do-nothing constructor for use by subclasses.




Method Detail
addAndGet
public long addAndGet(T obj, long delta)(Code)
Atomically add the given value to current value.
Parameters:
  obj - An object whose field to get and set
Parameters:
  delta - the value to add the updated value;



compareAndSet
abstract public boolean compareAndSet(T obj, long expect, long update)(Code)
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.
Parameters:
  obj - An object whose field to conditionally set
Parameters:
  expect - the expected value
Parameters:
  update - the new value true if successful.
throws:
  ClassCastException - if obj is not an instanceof the class possessing the field established in the constructor.



decrementAndGet
public long decrementAndGet(T obj)(Code)
Atomically decrement by one the current value.
Parameters:
  obj - An object whose field to get and set the updated value;



get
abstract public long get(T obj)(Code)
Get the current value held in the field by the given object.
Parameters:
  obj - An object whose field to get the current value



getAndAdd
public long getAndAdd(T obj, long delta)(Code)
Atomically add the given value to current value.
Parameters:
  obj - An object whose field to get and set
Parameters:
  delta - the value to add the previous value;



getAndDecrement
public long getAndDecrement(T obj)(Code)
Atomically decrement by one the current value.
Parameters:
  obj - An object whose field to get and set the previous value;



getAndIncrement
public long getAndIncrement(T obj)(Code)
Atomically increment by one the current value.
Parameters:
  obj - An object whose field to get and set the previous value;



getAndSet
public long getAndSet(T obj, long newValue)(Code)
Set to the given value and return the old value.
Parameters:
  obj - An object whose field to get and set
Parameters:
  newValue - the new value the previous value



incrementAndGet
public long incrementAndGet(T obj)(Code)
Atomically increment by one the current value.
Parameters:
  obj - An object whose field to get and set the updated value;



newUpdater
public static AtomicLongFieldUpdater<U> newUpdater(Class<U> tclass, String fieldName)(Code)
Creates an updater for objects with the given field. The Class argument is needed to check that reflective types and generic types match.
Parameters:
  tclass - the class of the objects holding the field
Parameters:
  fieldName - the name of the field to be updated. the updater
throws:
  IllegalArgumentException - if the field is not avolatile long type.
throws:
  RuntimeException - with a nested reflection-basedexception if the class does not hold field or is the wrong type.



set
abstract public void set(T obj, long newValue)(Code)
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.
Parameters:
  obj - An object whose field to set
Parameters:
  newValue - the new value



weakCompareAndSet
abstract public boolean weakCompareAndSet(T obj, long expect, long update)(Code)
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.
Parameters:
  obj - An object whose field to conditionally set
Parameters:
  expect - the expected value
Parameters:
  update - the new value true if successful.
throws:
  ClassCastException - if obj is not an instanceof the class possessing the field established in the constructor.



Methods inherited from java.lang.Object
protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object object)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final public Class<? extends Object> getClass()(Code)(Java Doc)
public int hashCode()(Code)(Java Doc)
final public void notify()(Code)(Java Doc)
final public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final public void wait(long millis, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait(long millis) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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