Package com.google.common.util.concurrent

Class AtomicDoubleArray

  • All Implemented Interfaces:
    java.io.Serializable
    public class AtomicDoubleArray
extends java.lang.Object
implements java.io.Serializable
    A double array in which elements may be updated atomically. See the java.util.concurrent.atomic package specification for description of the properties of atomic variables.

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

     
 static boolean bitEquals(double x, double y) {
   long xBits = Double.doubleToRawLongBits(x);
   long yBits = Double.doubleToRawLongBits(y);
   return xBits == yBits;
 }
    Since:
    11.0
    See Also:
    Serialized Form

    • Constructor Summary

      Constructors 
      Constructor Description
      AtomicDoubleArray​(double[] array)
      Creates a new AtomicDoubleArray with the same length as, and all elements copied from, the given array.
      AtomicDoubleArray​(int length)
      Creates a new AtomicDoubleArray of the given length, with all elements initially zero.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      double addAndGet​(int i, double delta)
      Atomically adds the given value to the element at index i.
      boolean compareAndSet​(int i, double expect, double update)
      Atomically sets the element at position i to the given updated value if the current value is bitwise equal to the expected value.
      double get​(int i)
      Gets the current value at position i.
      double getAndAdd​(int i, double delta)
      Atomically adds the given value to the element at index i.
      double getAndSet​(int i, double newValue)
      Atomically sets the element at position i to the given value and returns the old value.
      void lazySet​(int i, double newValue)
      Eventually sets the element at position i to the given value.
      int length()
      Returns the length of the array.
      void set​(int i, double newValue)
      Sets the element at position i to the given value.
      java.lang.String toString()
      Returns the String representation of the current values of array.
      boolean weakCompareAndSet​(int i, double expect, double update)
      Atomically sets the element at position i to the given updated value if the current value is bitwise equal to the expected value.

      • Methods inherited from class java.lang.Object

        equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

    • Constructor Detail

      • AtomicDoubleArray

        public AtomicDoubleArray​(int length)
        Creates a new AtomicDoubleArray of the given length, with all elements initially zero.
        Parameters:
        length - the length of the array

      • AtomicDoubleArray

        public AtomicDoubleArray​(double[] array)
        Creates a new AtomicDoubleArray with the same length as, and all elements copied from, the given array.
        Parameters:
        array - the array to copy elements from
        Throws:
        java.lang.NullPointerException - if array is null

    • Method Detail

      • length

        public final int length()
        Returns the length of the array.
        Returns:
        the length of the array

      • get

        public final double get​(int i)
        Gets the current value at position i.
        Parameters:
        i - the index
        Returns:
        the current value

      • set

        public final void set​(int i,
                      double newValue)
        Sets the element at position i to the given value.
        Parameters:
        i - the index
        newValue - the new value

      • lazySet

        public final void lazySet​(int i,
                          double newValue)
        Eventually sets the element at position i to the given value.
        Parameters:
        i - the index
        newValue - the new value

      • getAndSet

        public final double getAndSet​(int i,
                              double newValue)
        Atomically sets the element at position i to the given value and returns the old value.
        Parameters:
        i - the index
        newValue - the new value
        Returns:
        the previous value

      • compareAndSet

        public final boolean compareAndSet​(int i,
                                   double expect,
                                   double update)
        Atomically sets the element at position i to the given updated value if the current value is bitwise equal to the expected value.
        Parameters:
        i - the index
        expect - the expected value
        update - the new value
        Returns:
        true if successful. False return indicates that the actual value was not equal to the expected value.

      • weakCompareAndSet

        public final boolean weakCompareAndSet​(int i,
                                       double expect,
                                       double update)
        Atomically sets the element at position i to the given updated value if the current value is bitwise equal to the expected value.

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

        Parameters:
        i - the index
        expect - the expected value
        update - the new value
        Returns:
        true if successful

      • getAndAdd

        public final double getAndAdd​(int i,
                              double delta)
        Atomically adds the given value to the element at index i.
        Parameters:
        i - the index
        delta - the value to add
        Returns:
        the previous value

      • addAndGet

        public double addAndGet​(int i,
                        double delta)
        Atomically adds the given value to the element at index i.
        Parameters:
        i - the index
        delta - the value to add
        Returns:
        the updated value

      • toString

        public java.lang.String toString()
        Returns the String representation of the current values of array.
        Overrides:
        toString in class java.lang.Object
        Returns:
        the String representation of the current values of array