- java.lang.Object
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- java.util.concurrent.atomic.AtomicLongArray
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- All Implemented Interfaces:
- Serializable
public class AtomicLongArray extends Object implements Serializable
Along
array in which elements may be updated atomically. See thejava.util.concurrent.atomic
package specification for description of the properties of atomic variables.- Since:
- 1.5
- See Also:
- Serialized Form
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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.
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Method Summary
Methods Modifier and Type Method and Description long
addAndGet(int i, long delta)
Atomically adds the given value to the element at indexi
.boolean
compareAndSet(int i, long expect, long update)
Atomically sets the element at positioni
to the given updated value if the current value==
the expected value.long
decrementAndGet(int i)
Atomically decrements by one the element at indexi
.long
get(int i)
Gets the current value at positioni
.long
getAndAdd(int i, long delta)
Atomically adds the given value to the element at indexi
.long
getAndDecrement(int i)
Atomically decrements by one the element at indexi
.long
getAndIncrement(int i)
Atomically increments by one the element at indexi
.long
getAndSet(int i, long newValue)
Atomically sets the element at positioni
to the given value and returns the old value.long
incrementAndGet(int i)
Atomically increments by one the element at indexi
.void
lazySet(int i, long newValue)
Eventually sets the element at positioni
to the given value.int
length()
Returns the length of the array.void
set(int i, long newValue)
Sets the element at positioni
to the given value.String
toString()
Returns the String representation of the current values of array.boolean
weakCompareAndSet(int i, long expect, long update)
Atomically sets the element at positioni
to the given updated value if the current value==
the expected value.
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Constructor Detail
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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
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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
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Method Detail
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length
public final int length()
Returns the length of the array.- Returns:
- the length of the array
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get
public final long get(int i)
Gets the current value at positioni
.- Parameters:
i
- the index- Returns:
- the current value
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set
public final void set(int i, long newValue)
Sets the element at positioni
to the given value.- Parameters:
i
- the indexnewValue
- the new value
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lazySet
public final void lazySet(int i, long newValue)
Eventually sets the element at positioni
to the given value.- Parameters:
i
- the indexnewValue
- the new value- Since:
- 1.6
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getAndSet
public final long getAndSet(int i, long newValue)
Atomically sets the element at positioni
to the given value and returns the old value.- Parameters:
i
- the indexnewValue
- the new value- Returns:
- the previous value
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compareAndSet
public final boolean compareAndSet(int i, long expect, long update)
Atomically sets the element at positioni
to the given updated value if the current value==
the expected value.- Parameters:
i
- the indexexpect
- the expected valueupdate
- the new value- Returns:
- true if successful. False return indicates that the actual value was not equal to the expected value.
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weakCompareAndSet
public final boolean weakCompareAndSet(int i, long expect, long update)
Atomically sets the element at positioni
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 indexexpect
- the expected valueupdate
- the new value- Returns:
- true if successful.
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getAndIncrement
public final long getAndIncrement(int i)
Atomically increments by one the element at indexi
.- Parameters:
i
- the index- Returns:
- the previous value
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getAndDecrement
public final long getAndDecrement(int i)
Atomically decrements by one the element at indexi
.- Parameters:
i
- the index- Returns:
- the previous value
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getAndAdd
public final long getAndAdd(int i, long delta)
Atomically adds the given value to the element at indexi
.- Parameters:
i
- the indexdelta
- the value to add- Returns:
- the previous value
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incrementAndGet
public final long incrementAndGet(int i)
Atomically increments by one the element at indexi
.- Parameters:
i
- the index- Returns:
- the updated value
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decrementAndGet
public final long decrementAndGet(int i)
Atomically decrements by one the element at indexi
.- Parameters:
i
- the index- Returns:
- the updated value
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addAndGet
public long addAndGet(int i, long delta)
Atomically adds the given value to the element at indexi
.- Parameters:
i
- the indexdelta
- the value to add- Returns:
- the updated value
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