Class AtomicIntegerArray

• java.lang.Object
• • java.util.concurrent.atomic.AtomicIntegerArray

All Implemented Interfaces:

Serializable

public class AtomicIntegerArray
extends Object
implements Serializable

An int 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

Constructors

AtomicIntegerArray

public AtomicIntegerArray(int length)

Creates a new AtomicIntegerArray of the given length, with all elements initially zero.

Parameters:

length - the length of the array

AtomicIntegerArray

public AtomicIntegerArray(int[] array)

Creates a new AtomicIntegerArray 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

Methods

length

public final int length()

Returns the length of the array.

Returns:

the length of the array

get

public final int 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,
                      int 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,
                          int 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 int getAndSet(int i,
                           int 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,
                                   int expect,
                                   int 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,
                                       int expect,
                                       int update)

Parameters:

i - the index

expect - the expected value

update - the new value

Returns:

true if successful

getAndIncrement

public final int getAndIncrement(int i)

Atomically increments by one the element at index i.

Parameters:

i - the index

Returns:

the previous value

getAndDecrement

public final int getAndDecrement(int i)

Atomically decrements by one the element at index i.

Parameters:

i - the index

Returns:

the previous value

getAndAdd

public final int getAndAdd(int i,
                           int 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 int incrementAndGet(int i)

Atomically increments by one the element at index i.

Parameters:

i - the index

Returns:

the updated value

decrementAndGet

public final int decrementAndGet(int i)

Atomically decrements by one the element at index i.

Parameters:

i - the index

Returns:

the updated value

addAndGet

public final int addAndGet(int i,
                           int 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 int getAndUpdate(int i,
                              IntUnaryOperator 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 int updateAndGet(int i,
                              IntUnaryOperator 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 int getAndAccumulate(int i,
                                  int x,
                                  IntBinaryOperator 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 int accumulateAndGet(int i,
                                  int x,
                                  IntBinaryOperator 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