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Java Standard Edition (SE)

AtomicReferenceArray


compact1, compact2, compact3
java.util.concurrent.atomic

Class AtomicReferenceArray<E>

  • Type Parameters:
    E - The base class of elements held in this array
    All Implemented Interfaces:
    Serializable


    public class AtomicReferenceArray<E>
    extends Object
    implements Serializable
    An array of object references in which elements may be updated atomically. See the java.util.concurrent.atomic package specification for description of the properties of atomic variables.
    Since:
    1.5
    See Also:
    Serialized Form
    • Constructor Summary

      Constructors 
      Constructor and Description
      AtomicReferenceArray(E[] array)
      Creates a new AtomicReferenceArray with the same length as, and all elements copied from, the given array.
      AtomicReferenceArray(int length)
      Creates a new AtomicReferenceArray of the given length, with all elements initially null.
    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method and Description
      E accumulateAndGet(int i, E x, BinaryOperator<E> accumulatorFunction)
      Atomically updates the element at index i with the results of applying the given function to the current and given values, returning the updated value.
      boolean compareAndSet(int i, E expect, E update)
      Atomically sets the element at position i to the given updated value if the current value == the expected value.
      E get(int i)
      Gets the current value at position i.
      E getAndAccumulate(int i, E x, BinaryOperator<E> accumulatorFunction)
      Atomically updates the element at index i with the results of applying the given function to the current and given values, returning the previous value.
      E getAndSet(int i, E newValue)
      Atomically sets the element at position i to the given value and returns the old value.
      E getAndUpdate(int i, UnaryOperator<E> updateFunction)
      Atomically updates the element at index i with the results of applying the given function, returning the previous value.
      void lazySet(int i, E newValue)
      Eventually sets the element at position i to the given value.
      int length()
      Returns the length of the array.
      void set(int i, E newValue)
      Sets the element at position i to the given value.
      String toString()
      Returns the String representation of the current values of array.
      E updateAndGet(int i, UnaryOperator<E> updateFunction)
      Atomically updates the element at index i with the results of applying the given function, returning the updated value.
      boolean weakCompareAndSet(int i, E expect, E update)
      Atomically sets the element at position i to the given updated value if the current value == the expected value.
    • Constructor Detail

      • AtomicReferenceArray

        public AtomicReferenceArray(int length)
        Creates a new AtomicReferenceArray of the given length, with all elements initially null.
        Parameters:
        length - the length of the array
      • AtomicReferenceArray

        public AtomicReferenceArray(E[] array)
        Creates a new AtomicReferenceArray with the same length as, and all elements copied from, the given array.
        Parameters:
        array - the array to copy elements from
        Throws:
        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 E 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,
                              E 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,
                                  E newValue)
        Eventually sets the element at position i to the given value.
        Parameters:
        i - the index
        newValue - the new value
        Since:
        1.6
      • getAndSet

        public final E getAndSet(int i,
                                 E 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,
                                           E expect,
                                           E update)
        Atomically sets the element at position i to the given updated value if the current value == 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,
                                               E expect,
                                               E update)
        Atomically sets the element at position i to the given updated value if the current value == 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
      • getAndUpdate

        public final E getAndUpdate(int i,
                                    UnaryOperator<E> updateFunction)
        Atomically updates the element at index i 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.
        Parameters:
        i - the index
        updateFunction - a side-effect-free function
        Returns:
        the previous value
        Since:
        1.8
      • updateAndGet

        public final E updateAndGet(int i,
                                    UnaryOperator<E> updateFunction)
        Atomically updates the element at index i 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.
        Parameters:
        i - the index
        updateFunction - a side-effect-free function
        Returns:
        the updated value
        Since:
        1.8
      • getAndAccumulate

        public final E getAndAccumulate(int i,
                                        E x,
                                        BinaryOperator<E> accumulatorFunction)
        Atomically updates the element at index i 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 at index i as its first argument, and the given update as the second argument.
        Parameters:
        i - the index
        x - the update value
        accumulatorFunction - a side-effect-free function of two arguments
        Returns:
        the previous value
        Since:
        1.8
      • accumulateAndGet

        public final E accumulateAndGet(int i,
                                        E x,
                                        BinaryOperator<E> accumulatorFunction)
        Atomically updates the element at index i 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 at index i as its first argument, and the given update as the second argument.
        Parameters:
        i - the index
        x - the update value
        accumulatorFunction - a side-effect-free function of two arguments
        Returns:
        the updated value
        Since:
        1.8
      • toString

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


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