Class AtomicDoubleArray
- java.lang.Object
-
- com.google.common.util.concurrent.AtomicDoubleArray
-
- All Implemented Interfaces:
java.io.Serializable
@GwtIncompatible public class AtomicDoubleArray extends java.lang.Object implements java.io.Serializable
Adouble
array in which elements may be updated atomically. See thejava.util.concurrent.atomic
package specification for description of the properties of atomic variables.This class compares primitive
double
values in methods such ascompareAndSet(int, double, double)
by comparing their bitwise representation usingDouble.doubleToRawLongBits(double)
, which differs from both the primitive double==
operator and fromDouble.equals(java.lang.Object)
, as if implemented by:static boolean bitEquals(double x, double y) { long xBits = Double.doubleToRawLongBits(x); long yBits = Double.doubleToRawLongBits(y); return xBits == yBits; }
- Since:
- 11.0
- Author:
- Doug Lea, Martin Buchholz
- See Also:
- Serialized Form
-
-
Constructor Summary
Constructors Constructor Description AtomicDoubleArray(double[] array)
Creates a newAtomicDoubleArray
with the same length as, and all elements copied from, the given array.AtomicDoubleArray(int length)
Creates a newAtomicDoubleArray
of the given length, with all elements initially zero.
-
Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description double
accumulateAndGet(int i, double x, java.util.function.DoubleBinaryOperator accumulatorFunction)
Atomically updates the element at indexi
with the results of applying the given function to the current and given values.double
addAndGet(int i, double delta)
Atomically adds the given value to the element at indexi
.boolean
compareAndSet(int i, double expect, double update)
Atomically sets the element at positioni
to the given updated value if the current value is bitwise equal to the expected value.double
get(int i)
Gets the current value at positioni
.double
getAndAccumulate(int i, double x, java.util.function.DoubleBinaryOperator accumulatorFunction)
Atomically updates the element at indexi
with the results of applying the given function to the current and given values.double
getAndAdd(int i, double delta)
Atomically adds the given value to the element at indexi
.double
getAndSet(int i, double newValue)
Atomically sets the element at positioni
to the given value and returns the old value.double
getAndUpdate(int i, java.util.function.DoubleUnaryOperator updaterFunction)
Atomically updates the element at indexi
with the results of applying the given function to the current value.void
lazySet(int i, double newValue)
Eventually sets the element at positioni
to the given value.int
length()
Returns the length of the array.void
set(int i, double newValue)
Atomically sets the element at positioni
to the given value.java.lang.String
toString()
Returns the String representation of the current values of array.double
updateAndGet(int i, java.util.function.DoubleUnaryOperator updaterFunction)
Atomically updates the element at indexi
with the results of applying the given function to the current value.boolean
weakCompareAndSet(int i, double expect, double update)
Atomically sets the element at positioni
to the given updated value if the current value is bitwise equal to the expected value.
-
-
-
Constructor Detail
-
AtomicDoubleArray
public AtomicDoubleArray(int length)
Creates a newAtomicDoubleArray
of the given length, with all elements initially zero.- Parameters:
length
- the length of the array
-
AtomicDoubleArray
public AtomicDoubleArray(double[] array)
Creates a newAtomicDoubleArray
with the same length as, and all elements copied from, the given array.- Parameters:
array
- the array to copy elements from- Throws:
java.lang.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 double get(int i)
Gets the current value at positioni
.- Parameters:
i
- the index- Returns:
- the current value
-
set
public final void set(int i, double newValue)
Atomically sets the element at positioni
to the given value.- Parameters:
i
- the indexnewValue
- the new value
-
lazySet
public final void lazySet(int i, double newValue)
Eventually sets the element at positioni
to the given value.- Parameters:
i
- the indexnewValue
- the new value
-
getAndSet
public final double getAndSet(int i, double 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
-
compareAndSet
public final boolean compareAndSet(int i, double expect, double update)
Atomically sets the element at positioni
to the given updated value if the current value is bitwise equal to 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.
-
weakCompareAndSet
public final boolean weakCompareAndSet(int i, double expect, double update)
Atomically sets the element at positioni
to the given updated value if the current value is bitwise equal to 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
-
getAndAdd
@CanIgnoreReturnValue public final double getAndAdd(int i, double delta)
Atomically adds the given value to the element at indexi
.- Parameters:
i
- the indexdelta
- the value to add- Returns:
- the previous value
-
addAndGet
@CanIgnoreReturnValue public double addAndGet(int i, double delta)
Atomically adds the given value to the element at indexi
.- Parameters:
i
- the indexdelta
- the value to add- Returns:
- the updated value
-
getAndAccumulate
@CanIgnoreReturnValue public final double getAndAccumulate(int i, double x, java.util.function.DoubleBinaryOperator accumulatorFunction)
Atomically updates the element at indexi
with the results of applying the given function to the current and given values.- Parameters:
i
- the index to updatex
- the update valueaccumulatorFunction
- the accumulator function- Returns:
- the previous value
- Since:
- 31.1
-
accumulateAndGet
@CanIgnoreReturnValue public final double accumulateAndGet(int i, double x, java.util.function.DoubleBinaryOperator accumulatorFunction)
Atomically updates the element at indexi
with the results of applying the given function to the current and given values.- Parameters:
i
- the index to updatex
- the update valueaccumulatorFunction
- the accumulator function- Returns:
- the updated value
- Since:
- 31.1
-
getAndUpdate
@CanIgnoreReturnValue public final double getAndUpdate(int i, java.util.function.DoubleUnaryOperator updaterFunction)
Atomically updates the element at indexi
with the results of applying the given function to the current value.- Parameters:
i
- the index to updateupdaterFunction
- the update function- Returns:
- the previous value
- Since:
- 31.1
-
updateAndGet
@CanIgnoreReturnValue public final double updateAndGet(int i, java.util.function.DoubleUnaryOperator updaterFunction)
Atomically updates the element at indexi
with the results of applying the given function to the current value.- Parameters:
i
- the index to updateupdaterFunction
- the update function- Returns:
- the updated value
- Since:
- 31.1
-
toString
public java.lang.String toString()
Returns the String representation of the current values of array.- Overrides:
toString
in classjava.lang.Object
- Returns:
- the String representation of the current values of array
-
-