jdk.util.concurrent.atomic.AtomicLongFieldUpdater — clojure-interop/java.util.concurrent 1.0.0

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 only with respect to other invocations of compareAndSet and set on the same updater.

*new-updater clj

(*new-updater tclass field-name)

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.

tclass - the class of the objects holding the field - java.lang.Class<U> field-name - the name of the field to be updated - java.lang.String

returns: the updater - <U> java.util.concurrent.atomic.AtomicLongFieldUpdater<U>

throws: java.lang.IllegalArgumentException - if the field is not a volatile long type

accumulate-and-get clj

(accumulate-and-get this obj x accumulator-function)

Atomically updates the field of the given object managed by this updater with the results of applying the given function to the current and given values, returning the updated value. The function should be side-effect-free, since it may be re-applied when attempted updates fail due to contention among threads. The function is applied with the current value as its first argument, and the given update as the second argument.

obj - An object whose field to get and set - AtomicLongFieldUpdater.T x - the update value - long accumulator-function - a side-effect-free function of two arguments - java.util.function.LongBinaryOperator

returns: the updated value - long

add-and-get clj

(add-and-get this obj delta)

Atomically adds the given value to the current value of the field of the given object managed by this updater.

obj - An object whose field to get and set - AtomicLongFieldUpdater.T delta - the value to add - long

returns: the updated value - long

compare-and-set clj

(compare-and-set this obj expect update)

Atomically sets 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.

obj - An object whose field to conditionally set - AtomicLongFieldUpdater.T expect - the expected value - long update - the new value - long

returns: true if successful - boolean

throws: java.lang.ClassCastException - if obj is not an instance of the class possessing the field established in the constructor

decrement-and-get clj

(decrement-and-get this obj)

Atomically decrements by one the current value of the field of the given object managed by this updater.

obj - An object whose field to get and set - AtomicLongFieldUpdater.T

returns: the updated value - long

get clj

(get this obj)

Gets the current value held in the field of the given object managed by this updater.

obj - An object whose field to get - AtomicLongFieldUpdater.T

returns: the current value - long

get-and-accumulate clj

(get-and-accumulate this obj x accumulator-function)

Atomically updates the field of the given object managed by this updater with the results of applying the given function to the current and given values, returning the previous value. The function should be side-effect-free, since it may be re-applied when attempted updates fail due to contention among threads. The function is applied with the current value as its first argument, and the given update as the second argument.

obj - An object whose field to get and set - AtomicLongFieldUpdater.T x - the update value - long accumulator-function - a side-effect-free function of two arguments - java.util.function.LongBinaryOperator

returns: the previous value - long

get-and-add clj

(get-and-add this obj delta)

Atomically adds the given value to the current value of the field of the given object managed by this updater.

obj - An object whose field to get and set - AtomicLongFieldUpdater.T delta - the value to add - long

returns: the previous value - long

get-and-decrement clj

(get-and-decrement this obj)

Atomically decrements by one the current value of the field of the given object managed by this updater.

obj - An object whose field to get and set - AtomicLongFieldUpdater.T

returns: the previous value - long

get-and-increment clj

(get-and-increment this obj)

Atomically increments by one the current value of the field of the given object managed by this updater.

obj - An object whose field to get and set - AtomicLongFieldUpdater.T

returns: the previous value - long

get-and-set clj

(get-and-set this obj new-value)

Atomically sets the field of the given object managed by this updater to the given value and returns the old value.

obj - An object whose field to get and set - AtomicLongFieldUpdater.T new-value - the new value - long

returns: the previous value - long

get-and-update clj

(get-and-update this obj update-function)

Atomically updates the field of the given object managed by this updater with the results of applying the given function, returning the previous value. The function should be side-effect-free, since it may be re-applied when attempted updates fail due to contention among threads.

obj - An object whose field to get and set - AtomicLongFieldUpdater.T update-function - a side-effect-free function - java.util.function.LongUnaryOperator

returns: the previous value - long

increment-and-get clj

(increment-and-get this obj)

Atomically increments by one the current value of the field of the given object managed by this updater.

obj - An object whose field to get and set - AtomicLongFieldUpdater.T

returns: the updated value - long

lazy-set clj

(lazy-set this obj new-value)

Eventually sets the field of the given object managed by this updater to the given updated value.

obj - An object whose field to set - AtomicLongFieldUpdater.T new-value - the new value - long

set clj

(set this obj new-value)

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 compareAndSet.

obj - An object whose field to set - AtomicLongFieldUpdater.T new-value - the new value - long

update-and-get clj

(update-and-get this obj update-function)

Atomically updates the field of the given object managed by this updater with the results of applying the given function, returning the updated value. The function should be side-effect-free, since it may be re-applied when attempted updates fail due to contention among threads.

obj - An object whose field to get and set - AtomicLongFieldUpdater.T update-function - a side-effect-free function - java.util.function.LongUnaryOperator

returns: the updated value - long

weak-compare-and-set clj

(weak-compare-and-set this obj expect update)

Atomically sets 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.

May fail spuriously and does not provide ordering guarantees, so is only rarely an appropriate alternative to compareAndSet.

obj - An object whose field to conditionally set - AtomicLongFieldUpdater.T expect - the expected value - long update - the new value - long

returns: true if successful - boolean

throws: java.lang.ClassCastException - if obj is not an instance of the class possessing the field established in the constructor