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java.util.concurrent.atomic
Class AtomicLongFieldUpdater<T>
java.lang.Object
java.util.concurrent.atomic.AtomicLongFieldUpdater<T>
-
-
Type Parameters:
-
T - The type of the object holding the updatable field
-
public abstract class AtomicLongFieldUpdater<T>
- extends Object
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
on the same updater.
.
-
Since:
-
1.5
Constructor Summary
|
protected |
AtomicLongFieldUpdater
()
Protected do-nothing constructor for use by subclasses. |
Method Summary
|
long |
addAndGet
(
T
Atomically
adds
add
the given value to
the
current
value of the field of the given object managed by this updater.
value.
|
abstract boolean |
compareAndSet
(
T
Atomically
sets
set
the
value of the
field of the given object managed by this
updater
Updater
to the given updated value if the current value
==
the expected value. |
long |
decrementAndGet
(
T
Atomically
decrements
decrement
by one the current
value of the field of the given object managed by this updater.
value.
|
abstract long |
get
(
T
Gets
Get
the current value held in the field
of
by
the given
object managed by this updater.
object.
|
long |
getAndAdd
(
T
Atomically
adds
add
the given value to
the
current
value of the field of the given object managed by this updater.
value.
|
long |
getAndDecrement
(
T
Atomically
decrements
decrement
by one the current
value of the field of the given object managed by this updater.
value.
|
long |
getAndIncrement
(
T
Atomically
increments
increment
by one the current
value of the field of the given object managed by this updater.
value.
|
long |
getAndSet
(
T
Atomically sets the field of the given object managed by this updater
Set
to the given value and
returns
return
the old value. |
long |
incrementAndGet
(
T
Atomically
increments
increment
by one the current
value of the field of the given object managed by this updater.
value.
|
abstract void
|
lazySet
(
T
Eventually sets the field of the given object managed by this updater to the given updated value.
|
static
|
newUpdater
(
Class
<U> tclass,
String
fieldName)
Creates
and returns
an updater for objects with the given field. |
abstract void |
set
(
T
Sets
Set
the field of the given object managed by this
updater to the given updated value.
updater.
|
abstract boolean |
weakCompareAndSet
(
T
Atomically
sets
set
the
value of the
field of the given object managed by this
updater
Updater
to the given updated value if the current value
==
the expected value. |
Methods inherited from class java.lang.
Object
|
clone
,
equals
,
finalize
,
getClass
,
hashCode
,
notify
,
notifyAll
,
toString
,
wait
,
wait
,
wait
|
AtomicLongFieldUpdater
protected AtomicLongFieldUpdater()
-
Protected do-nothing constructor for use by subclasses.
newUpdater
public static <U> AtomicLongFieldUpdater<U> newUpdater(Class<U> tclass,
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.
-
-
Parameters:
-
tclass - the class of the objects holding the field
-
fieldName - the name of the field to be updated.
-
Returns:
-
the updater
-
Throws:
-
IllegalArgumentException
- if the field is not a volatile long type.
-
RuntimeException
- with a nested reflection-based exception if the class does not hold field or is the wrong type.
compareAndSet
public abstract boolean compareAndSet(T obj,
long expect,
long update)
-
Atomically
sets
set
the
value of the
field of the given object managed by this
updater
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
-
expect - the expected value
-
update - the new value
-
Returns:
-
true if successful.
-
Throws:
-
ClassCastException
- if
obj
is not an instance of the class possessing the field established in the constructor.
weakCompareAndSet
public abstract boolean weakCompareAndSet(T obj,
long expect,
long update)
-
Atomically
sets
set
the
value of the
field of the given object managed by this
updater
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
-
expect - the expected value
-
update - the new value
-
Returns:
-
true if successful.
-
Throws:
-
ClassCastException
- if
obj
is not an instance of the class possessing the field established in the constructor.
set
public abstract void set(T obj,
long newValue)
-
Sets
Set
the field of the given object managed by this
updater to the given updated value.
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
-
newValue - the new value
lazySet
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.
-
-
Parameters:
-
obj - An object whose field to set
-
newValue - the new value
-
Since:
-
1.6
get
public abstract long get(T obj)
-
Gets
Get
the current value held in the field
of
by
the given
object managed by this updater.
object.
-
-
Parameters:
-
obj - An object whose field to get
-
Returns:
-
the current value
getAndSet
public long getAndSet(T obj,
long newValue)
-
Atomically sets the field of the given object managed by this updater
Set
to the given value and
returns
return
the old value.
-
-
Parameters:
-
obj - An object whose field to get and set
-
newValue - the new value
-
Returns:
-
the previous value
getAndIncrement
public long getAndIncrement(T obj)
-
Atomically increments by one the current value of the field of the given object managed by this updater.
Atomically increment by one the current value.
-
-
Parameters:
-
obj - An object whose field to get and set
-
Returns:
-
the previous
value
value;
getAndDecrement
public long getAndDecrement(T obj)
-
Atomically decrements by one the current value of the field of the given object managed by this updater.
Atomically decrement by one the current value.
-
-
Parameters:
-
obj - An object whose field to get and set
-
Returns:
-
the previous
value
value;
getAndAdd
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.
Atomically add the given value to current value.
-
-
Parameters:
-
obj - An object whose field to get and set
-
delta - the value to add
-
Returns:
-
the previous
value
value;
incrementAndGet
public long incrementAndGet(T obj)
-
Atomically increments by one the current value of the field of the given object managed by this updater.
Atomically increment by one the current value.
-
-
Parameters:
-
obj - An object whose field to get and set
-
Returns:
-
the updated
value
value;
decrementAndGet
public long decrementAndGet(T obj)
-
Atomically decrements by one the current value of the field of the given object managed by this updater.
Atomically decrement by one the current value.
-
-
Parameters:
-
obj - An object whose field to get and set
-
Returns:
-
the updated
value
value;
addAndGet
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.
Atomically add the given value to current value.
-
-
Parameters:
-
obj - An object whose field to get and set
-
delta - the value to add
-
Returns:
-
the updated
value
value;