AtomicLongArray (Java Platform SE 6) (original) (raw)
java.util.concurrent.atomic
Class AtomicLongArray
java.lang.Object
java.util.concurrent.atomic.AtomicLongArray
All Implemented Interfaces:
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:
| Constructor Summary |
|---|
| AtomicLongArray(int length) Creates a new AtomicLongArray of given length. |
| AtomicLongArray(long[] array) Creates a new AtomicLongArray with the same length as, and all elements copied from, the given array. |
| Method Summary | |
|---|---|
| long | [addAndGet](../../../../java/util/concurrent/atomic/AtomicLongArray.html#addAndGet%28int, long%29)(int i, long delta) Atomically adds the given value to the element at index i. |
| boolean | [compareAndSet](../../../../java/util/concurrent/atomic/AtomicLongArray.html#compareAndSet%28int, long, long%29)(int i, long expect, long update) Atomically sets the value 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 | [getAndAdd](../../../../java/util/concurrent/atomic/AtomicLongArray.html#getAndAdd%28int, long%29)(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](../../../../java/util/concurrent/atomic/AtomicLongArray.html#getAndSet%28int, long%29)(int i, long newValue) Atomically sets the element at position i to the given value and returns the old value. |
| long | incrementAndGet(int i) Atomically increments by one the element at index i. |
| void | [lazySet](../../../../java/util/concurrent/atomic/AtomicLongArray.html#lazySet%28int, long%29)(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](../../../../java/util/concurrent/atomic/AtomicLongArray.html#set%28int, long%29)(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. |
| boolean | [weakCompareAndSet](../../../../java/util/concurrent/atomic/AtomicLongArray.html#weakCompareAndSet%28int, long, long%29)(int i, long expect, long update) Atomically sets the value to the given updated value if the current value == the expected value. |
| Methods inherited from class java.lang.Object |
|---|
| clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, [wait](../../../../java/lang/Object.html#wait%28long, int%29) |
| Constructor Detail |
|---|
AtomicLongArray
public AtomicLongArray(int length)
Creates a new AtomicLongArray of given length.
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](../../../../java/lang/NullPointerException.html "class in java.lang") - 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 value 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 value 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
toString
public String toString()
Returns the String representation of the current values of array.
Overrides:
[toString](../../../../java/lang/Object.html#toString%28%29) in class [Object](../../../../java/lang/Object.html "class in java.lang")
Returns:
the String representation of the current values of array.
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