Packages

class AtomicDouble extends Number with Serializable

A double value that may be updated atomically. See the java.util.concurrent.atomic package specification for description of the properties of atomic variables. An AtomicDouble is used in applications such as atomic accumulation, and cannot be used as a replacement for a Double. However, this class does extend Number to allow uniform access by tools and utilities that deal with numerically-based classes.

This class compares primitive double values in methods such as #compareAndSet by comparing their bitwise representation using Double#doubleToRawLongBits, which differs from both the primitive double == operator and from Double#equals, as if implemented by:


static boolean bitEquals(double x, double y) {
  long xBits = Double.doubleToRawLongBits(x);
  long yBits = Double.doubleToRawLongBits(y);
  return xBits == yBits;

}

It is possible to write a more scalable updater, at the cost of giving up strict atomicity. See for example <a href="http://gee.cs.oswego.edu/dl/jsr166/dist/docs/java.base/java/util/concurrent/atomic/DoubleAdder.html"> DoubleAdder.

Linear Supertypes
Number, Serializable, AnyRef, Any
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  1. AtomicDouble
  2. Number
  3. Serializable
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Visibility
  1. Public
  2. Protected

Instance Constructors

  1. new AtomicDouble()

    Creates a new AtomicDouble with initial value 0.0.

  2. new AtomicDouble(initialValue: Double)

Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##: Int
    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  4. final def accumulateAndGet(x: Double, accumulatorFunction: DoubleBinaryOperator): Double

    Atomically updates the current value with the results of applying the given function to the current and given values.

    Atomically updates the current value with the results of applying the given function to the current and given values.

    x

    the update value

    accumulatorFunction

    the accumulator function

    returns

    the updated value

    Since

    31.1

  5. final def addAndGet(delta: Double): Double

    Atomically adds the given value to the current value.

    Atomically adds the given value to the current value.

    delta

    the value to add

    returns

    the updated value

  6. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  7. def byteValue(): Byte
    Definition Classes
    Number
  8. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.CloneNotSupportedException]) @native() @HotSpotIntrinsicCandidate()
  9. final def compareAndSet(expect: Double, update: Double): Boolean

    Atomically sets the value to the given updated value if the current value is <a href="#bitEquals">bitwise equal to the expected value.

    Atomically sets the value to the given updated value if the current value is <a href="#bitEquals">bitwise equal to the expected value.

    expect

    the expected value

    update

    the new value

    returns

    true if successful. False return indicates that the actual value was not bitwise equal to the expected value.

  10. def doubleValue(): Double

    Returns the value of this AtomicDouble as a double.

    Returns the value of this AtomicDouble as a double.

    Definition Classes
    AtomicDouble → Number
    Annotations
    @Override()
  11. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  12. def equals(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef → Any
  13. def floatValue(): Float

    Returns the value of this AtomicDouble as a float after a narrowing primitive conversion.

    Returns the value of this AtomicDouble as a float after a narrowing primitive conversion.

    Definition Classes
    AtomicDouble → Number
    Annotations
    @Override()
  14. final def get(): Double

    Gets the current value.

    Gets the current value.

    returns

    the current value

  15. final def getAndAccumulate(x: Double, accumulatorFunction: DoubleBinaryOperator): Double

    Atomically updates the current value with the results of applying the given function to the current and given values.

    Atomically updates the current value with the results of applying the given function to the current and given values.

    x

    the update value

    accumulatorFunction

    the accumulator function

    returns

    the previous value

    Since

    31.1

  16. final def getAndAdd(delta: Double): Double

    Atomically adds the given value to the current value.

    Atomically adds the given value to the current value.

    delta

    the value to add

    returns

    the previous value

  17. final def getAndSet(newValue: Double): Double

    Atomically sets to the given value and returns the old value.

    Atomically sets to the given value and returns the old value.

    newValue

    the new value

    returns

    the previous value

  18. final def getAndUpdate(updateFunction: DoubleUnaryOperator): Double

    Atomically updates the current value with the results of applying the given function.

    Atomically updates the current value with the results of applying the given function.

    updateFunction

    the update function

    returns

    the previous value

    Since

    31.1

  19. final def getClass(): Class[_ <: AnyRef]
    Definition Classes
    AnyRef → Any
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  20. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  21. def intValue(): Int

    Returns the value of this AtomicDouble as an int after a narrowing primitive conversion.

    Returns the value of this AtomicDouble as an int after a narrowing primitive conversion.

    Definition Classes
    AtomicDouble → Number
    Annotations
    @Override()
  22. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  23. final def lazySet(newValue: Double): Unit

    Eventually sets to the given value.

    Eventually sets to the given value.

    newValue

    the new value

  24. def longValue(): Long

    Returns the value of this AtomicDouble as a long after a narrowing primitive conversion.

    Returns the value of this AtomicDouble as a long after a narrowing primitive conversion.

    Definition Classes
    AtomicDouble → Number
    Annotations
    @Override()
  25. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  26. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  27. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  28. final def set(newValue: Double): Unit

    Sets to the given value.

    Sets to the given value.

    newValue

    the new value

  29. def shortValue(): Short
    Definition Classes
    Number
  30. final def synchronized[T0](arg0: => T0): T0
    Definition Classes
    AnyRef
  31. def toString(): String

    Returns the String representation of the current value.

    Returns the String representation of the current value.

    returns

    the String representation of the current value

    Definition Classes
    AtomicDouble → AnyRef → Any
    Annotations
    @Override()
  32. final def updateAndGet(updateFunction: DoubleUnaryOperator): Double

    Atomically updates the current value with the results of applying the given function.

    Atomically updates the current value with the results of applying the given function.

    updateFunction

    the update function

    returns

    the updated value

    Since

    31.1

  33. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  34. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException]) @native()
  35. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  36. final def weakCompareAndSet(expect: Double, update: Double): Boolean

    Atomically sets the value to the given updated value if the current value is <a href="#bitEquals">bitwise equal to the expected value.

    Atomically sets the value to the given updated value if the current value is <a href="#bitEquals">bitwise equal to the expected value.

    May <a href="http://download.oracle.com/javase/7/docs/api/java/util/concurrent/atomic/package-summary.html#Spurious"> fail spuriously and does not provide ordering guarantees, so is only rarely an appropriate alternative to compareAndSet.

    expect

    the expected value

    update

    the new value

    returns

    true if successful

Deprecated Value Members

  1. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.Throwable]) @Deprecated
    Deprecated

Inherited from Number

Inherited from Serializable

Inherited from AnyRef

Inherited from Any

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