java.util.concurrent.atomic

Class AtomicLongArray

  • All Implemented Interfaces:
    Serializable 

    public class AtomicLongArray
extends Object
implements Serializable
    A long array 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
      AtomicLongArray(int length)
      Creates a new AtomicLongArray of the given length, with all elements initially zero.
      AtomicLongArray(long[] array)
      Creates a new AtomicLongArray with the same length as, and all elements copied from, the given array.

    • Method Summary

      Modifier and Type Method and Description
      long accumulateAndGet(int i, long x, LongBinaryOperator 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.
      long addAndGet(int i, long delta)
      Atomically adds the given value to the element at index i.
      boolean compareAndSet(int i, long expect, long update)
      Atomically sets the element at position i to the given updated value if the current value == the expected value.
      long decrementAndGet(int i)
      Atomically decrements by one the element at index i.
      long get(int i)
      Gets the current value at position i.
      long getAndAccumulate(int i, long x, LongBinaryOperator 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.
      long getAndAdd(int i, long delta)
      Atomically adds the given value to the element at index i.
      long getAndDecrement(int i)
      Atomically decrements by one the element at index i.
      long getAndIncrement(int i)
      Atomically increments by one the element at index i.
      long getAndSet(int i, long newValue)
      Atomically sets the element at position i to the given value and returns the old value.
      long getAndUpdate(int i, LongUnaryOperator updateFunction)
      Atomically updates the element at index i with the results of applying the given function, returning the previous value.
      long incrementAndGet(int i)
      Atomically increments by one the element at index i.
      void lazySet(int i, long newValue)
      Eventually sets the element at position i to the given value.
      int length()
      Returns the length of the array.
      void set(int i, long newValue)
      Sets the element at position i to the given value.
      String toString()
      Returns the String representation of the current values of array.
      long updateAndGet(int i, LongUnaryOperator updateFunction)
      Atomically updates the element at index i with the results of applying the given function, returning the updated value.
      boolean weakCompareAndSet(int i, long expect, long update)
      Atomically sets the element at position i to the given updated value if the current value == the expected value.

    • Constructor Detail

      • AtomicLongArray

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

      • AtomicLongArray

        public AtomicLongArray(long[] array)
        Creates a new AtomicLongArray 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 long 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,
                      long 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,
                          long 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 long getAndSet(int i,
                            long 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,
                                   long expect,
                                   long 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,
                                       long expect,
                                       long 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

      • getAndIncrement

        public final long getAndIncrement(int i)
        Atomically increments by one the element at index i.
        Parameters:
        i - the index
        Returns:
        the previous value

      • getAndDecrement

        public final long getAndDecrement(int i)
        Atomically decrements by one the element at index i.
        Parameters:
        i - the index
        Returns:
        the previous value

      • getAndAdd

        public final long getAndAdd(int i,
                            long 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

      • incrementAndGet

        public final long incrementAndGet(int i)
        Atomically increments by one the element at index i.
        Parameters:
        i - the index
        Returns:
        the updated value

      • decrementAndGet

        public final long decrementAndGet(int i)
        Atomically decrements by one the element at index i.
        Parameters:
        i - the index
        Returns:
        the updated value

      • addAndGet

        public long addAndGet(int i,
                      long 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

      • getAndUpdate

        public final long getAndUpdate(int i,
                               LongUnaryOperator 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 long updateAndGet(int i,
                               LongUnaryOperator 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 long getAndAccumulate(int i,
                                   long x,
                                   LongBinaryOperator 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 long accumulateAndGet(int i,
                                   long x,
                                   LongBinaryOperator 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