Class AtomicLongArray
java.lang.Object
java.util.concurrent.atomic.AtomicLongArray
- All Implemented Interfaces:
- Serializable
A 
long array in which elements may be updated atomically.
 See the VarHandle specification for descriptions of the
 properties of atomic accesses.- Since:
- 1.5
- See Also:
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Constructor SummaryConstructorsConstructorDescriptionAtomicLongArray(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 SummaryModifier and TypeMethodDescriptionfinal longaccumulateAndGet(int i, long x, LongBinaryOperator accumulatorFunction) Atomically updates (with memory effects as specified byVarHandle.compareAndSet(java.lang.Object...)) the element at indexiwith the results of applying the given function to the current and given values, returning the updated value.longaddAndGet(int i, long delta) Atomically adds the given value to the element at indexi, with memory effects as specified byVarHandle.getAndAdd(java.lang.Object...).final longcompareAndExchange(int i, long expectedValue, long newValue) Atomically sets the element at indexitonewValueif the element's current value, referred to as the witness value,== expectedValue, with memory effects as specified byVarHandle.compareAndExchange(java.lang.Object...).final longcompareAndExchangeAcquire(int i, long expectedValue, long newValue) Atomically sets the element at indexitonewValueif the element's current value, referred to as the witness value,== expectedValue, with memory effects as specified byVarHandle.compareAndExchangeAcquire(java.lang.Object...).final longcompareAndExchangeRelease(int i, long expectedValue, long newValue) Atomically sets the element at indexitonewValueif the element's current value, referred to as the witness value,== expectedValue, with memory effects as specified byVarHandle.compareAndExchangeRelease(java.lang.Object...).final booleancompareAndSet(int i, long expectedValue, long newValue) Atomically sets the element at indexitonewValueif the element's current value== expectedValue, with memory effects as specified byVarHandle.compareAndSet(java.lang.Object...).final longdecrementAndGet(int i) Atomically decrements the value of the element at indexi, with memory effects as specified byVarHandle.getAndAdd(java.lang.Object...).final longget(int i) Returns the current value of the element at indexi, with memory effects as specified byVarHandle.getVolatile(java.lang.Object...).final longgetAcquire(int i) Returns the current value of the element at indexi, with memory effects as specified byVarHandle.getAcquire(java.lang.Object...).final longgetAndAccumulate(int i, long x, LongBinaryOperator accumulatorFunction) Atomically updates (with memory effects as specified byVarHandle.compareAndSet(java.lang.Object...)) the element at indexiwith the results of applying the given function to the current and given values, returning the previous value.final longgetAndAdd(int i, long delta) Atomically adds the given value to the element at indexi, with memory effects as specified byVarHandle.getAndAdd(java.lang.Object...).final longgetAndDecrement(int i) Atomically decrements the value of the element at indexi, with memory effects as specified byVarHandle.getAndAdd(java.lang.Object...).final longgetAndIncrement(int i) Atomically increments the value of the element at indexi, with memory effects as specified byVarHandle.getAndAdd(java.lang.Object...).final longgetAndSet(int i, long newValue) Atomically sets the element at indexitonewValueand returns the old value, with memory effects as specified byVarHandle.getAndSet(java.lang.Object...).final longgetAndUpdate(int i, LongUnaryOperator updateFunction) Atomically updates (with memory effects as specified byVarHandle.compareAndSet(java.lang.Object...)) the element at indexiwith the results of applying the given function, returning the previous value.final longgetOpaque(int i) Returns the current value of the element at indexi, with memory effects as specified byVarHandle.getOpaque(java.lang.Object...).final longgetPlain(int i) Returns the current value of the element at indexi, with memory semantics of reading as if the variable was declared non-volatile.final longincrementAndGet(int i) Atomically increments the value of the element at indexi, with memory effects as specified byVarHandle.getAndAdd(java.lang.Object...).final voidlazySet(int i, long newValue) Sets the element at indexitonewValue, with memory effects as specified byVarHandle.setRelease(java.lang.Object...).final intlength()Returns the length of the array.final voidset(int i, long newValue) Sets the element at indexitonewValue, with memory effects as specified byVarHandle.setVolatile(java.lang.Object...).final voidsetOpaque(int i, long newValue) Sets the element at indexitonewValue, with memory effects as specified byVarHandle.setOpaque(java.lang.Object...).final voidsetPlain(int i, long newValue) Sets the element at indexitonewValue, with memory semantics of setting as if the variable was declared non-volatileand non-final.final voidsetRelease(int i, long newValue) Sets the element at indexitonewValue, with memory effects as specified byVarHandle.setRelease(java.lang.Object...).toString()Returns the String representation of the current values of array.final longupdateAndGet(int i, LongUnaryOperator updateFunction) Atomically updates (with memory effects as specified byVarHandle.compareAndSet(java.lang.Object...)) the element at indexiwith the results of applying the given function, returning the updated value.final booleanweakCompareAndSet(int i, long expectedValue, long newValue) Deprecated.final booleanweakCompareAndSetAcquire(int i, long expectedValue, long newValue) Possibly atomically sets the element at indexitonewValueif the element's current value== expectedValue, with memory effects as specified byVarHandle.weakCompareAndSetAcquire(java.lang.Object...).final booleanweakCompareAndSetPlain(int i, long expectedValue, long newValue) Possibly atomically sets the element at indexitonewValueif the element's current value== expectedValue, with memory effects as specified byVarHandle.weakCompareAndSetPlain(java.lang.Object...).final booleanweakCompareAndSetRelease(int i, long expectedValue, long newValue) Possibly atomically sets the element at indexitonewValueif the element's current value== expectedValue, with memory effects as specified byVarHandle.weakCompareAndSetRelease(java.lang.Object...).final booleanweakCompareAndSetVolatile(int i, long expectedValue, long newValue) Possibly atomically sets the element at indexitonewValueif the element's current value== expectedValue, with memory effects as specified byVarHandle.weakCompareAndSet(java.lang.Object...).
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Constructor Details- 
AtomicLongArraypublic 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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AtomicLongArraypublic 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 Details- 
lengthpublic final int length()Returns the length of the array.- Returns:
- the length of the array
 
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getpublic final long get(int i) Returns the current value of the element at indexi, with memory effects as specified byVarHandle.getVolatile(java.lang.Object...).- Parameters:
- i- the index
- Returns:
- the current value
 
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setpublic final void set(int i, long newValue) Sets the element at indexitonewValue, with memory effects as specified byVarHandle.setVolatile(java.lang.Object...).- Parameters:
- i- the index
- newValue- the new value
 
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lazySetpublic final void lazySet(int i, long newValue) Sets the element at indexitonewValue, with memory effects as specified byVarHandle.setRelease(java.lang.Object...).- Parameters:
- i- the index
- newValue- the new value
- Since:
- 1.6
 
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getAndSetpublic final long getAndSet(int i, long newValue) Atomically sets the element at indexitonewValueand returns the old value, with memory effects as specified byVarHandle.getAndSet(java.lang.Object...).- Parameters:
- i- the index
- newValue- the new value
- Returns:
- the previous value
 
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compareAndSetpublic final boolean compareAndSet(int i, long expectedValue, long newValue) Atomically sets the element at indexitonewValueif the element's current value== expectedValue, with memory effects as specified byVarHandle.compareAndSet(java.lang.Object...).- Parameters:
- i- the index
- expectedValue- the expected value
- newValue- the new value
- Returns:
- trueif successful. False return indicates that the actual value was not equal to the expected value.
 
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weakCompareAndSet@Deprecated(since="9") public final boolean weakCompareAndSet(int i, long expectedValue, long newValue) Deprecated.This method has plain memory effects but the method name implies volatile memory effects (see methods such ascompareAndExchange(int, long, long)andcompareAndSet(int, long, long)). To avoid confusion over plain or volatile memory effects it is recommended that the methodweakCompareAndSetPlain(int, long, long)be used instead.Possibly atomically sets the element at indexitonewValueif the element's current value== expectedValue, with memory effects as specified byVarHandle.weakCompareAndSetPlain(java.lang.Object...).- Parameters:
- i- the index
- expectedValue- the expected value
- newValue- the new value
- Returns:
- trueif successful
- See Also:
 
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weakCompareAndSetPlainpublic final boolean weakCompareAndSetPlain(int i, long expectedValue, long newValue) Possibly atomically sets the element at indexitonewValueif the element's current value== expectedValue, with memory effects as specified byVarHandle.weakCompareAndSetPlain(java.lang.Object...).- Parameters:
- i- the index
- expectedValue- the expected value
- newValue- the new value
- Returns:
- trueif successful
- Since:
- 9
 
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getAndIncrementpublic final long getAndIncrement(int i) Atomically increments the value of the element at indexi, with memory effects as specified byVarHandle.getAndAdd(java.lang.Object...).Equivalent to getAndAdd(i, 1).- Parameters:
- i- the index
- Returns:
- the previous value
 
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getAndDecrementpublic final long getAndDecrement(int i) Atomically decrements the value of the element at indexi, with memory effects as specified byVarHandle.getAndAdd(java.lang.Object...).Equivalent to getAndAdd(i, -1).- Parameters:
- i- the index
- Returns:
- the previous value
 
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getAndAddpublic final long getAndAdd(int i, long delta) Atomically adds the given value to the element at indexi, with memory effects as specified byVarHandle.getAndAdd(java.lang.Object...).- Parameters:
- i- the index
- delta- the value to add
- Returns:
- the previous value
 
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incrementAndGetpublic final long incrementAndGet(int i) Atomically increments the value of the element at indexi, with memory effects as specified byVarHandle.getAndAdd(java.lang.Object...).Equivalent to addAndGet(i, 1).- Parameters:
- i- the index
- Returns:
- the updated value
 
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decrementAndGetpublic final long decrementAndGet(int i) Atomically decrements the value of the element at indexi, with memory effects as specified byVarHandle.getAndAdd(java.lang.Object...).Equivalent to addAndGet(i, -1).- Parameters:
- i- the index
- Returns:
- the updated value
 
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addAndGetpublic long addAndGet(int i, long delta) Atomically adds the given value to the element at indexi, with memory effects as specified byVarHandle.getAndAdd(java.lang.Object...).- Parameters:
- i- the index
- delta- the value to add
- Returns:
- the updated value
 
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getAndUpdateAtomically updates (with memory effects as specified byVarHandle.compareAndSet(java.lang.Object...)) the element at indexiwith 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
 
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updateAndGetAtomically updates (with memory effects as specified byVarHandle.compareAndSet(java.lang.Object...)) the element at indexiwith 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
 
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getAndAccumulateAtomically updates (with memory effects as specified byVarHandle.compareAndSet(java.lang.Object...)) the element at indexiwith 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 of the element at indexias 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
 
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accumulateAndGetAtomically updates (with memory effects as specified byVarHandle.compareAndSet(java.lang.Object...)) the element at indexiwith 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 of the element at indexias 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
 
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toString
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getPlainpublic final long getPlain(int i) Returns the current value of the element at indexi, with memory semantics of reading as if the variable was declared non-volatile.- Parameters:
- i- the index
- Returns:
- the value
- Since:
- 9
 
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setPlainpublic final void setPlain(int i, long newValue) Sets the element at indexitonewValue, with memory semantics of setting as if the variable was declared non-volatileand non-final.- Parameters:
- i- the index
- newValue- the new value
- Since:
- 9
 
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getOpaquepublic final long getOpaque(int i) Returns the current value of the element at indexi, with memory effects as specified byVarHandle.getOpaque(java.lang.Object...).- Parameters:
- i- the index
- Returns:
- the value
- Since:
- 9
 
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setOpaquepublic final void setOpaque(int i, long newValue) Sets the element at indexitonewValue, with memory effects as specified byVarHandle.setOpaque(java.lang.Object...).- Parameters:
- i- the index
- newValue- the new value
- Since:
- 9
 
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getAcquirepublic final long getAcquire(int i) Returns the current value of the element at indexi, with memory effects as specified byVarHandle.getAcquire(java.lang.Object...).- Parameters:
- i- the index
- Returns:
- the value
- Since:
- 9
 
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setReleasepublic final void setRelease(int i, long newValue) Sets the element at indexitonewValue, with memory effects as specified byVarHandle.setRelease(java.lang.Object...).- Parameters:
- i- the index
- newValue- the new value
- Since:
- 9
 
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compareAndExchangepublic final long compareAndExchange(int i, long expectedValue, long newValue) Atomically sets the element at indexitonewValueif the element's current value, referred to as the witness value,== expectedValue, with memory effects as specified byVarHandle.compareAndExchange(java.lang.Object...).- Parameters:
- i- the index
- expectedValue- the expected value
- newValue- the new value
- Returns:
- the witness value, which will be the same as the expected value if successful
- Since:
- 9
 
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compareAndExchangeAcquirepublic final long compareAndExchangeAcquire(int i, long expectedValue, long newValue) Atomically sets the element at indexitonewValueif the element's current value, referred to as the witness value,== expectedValue, with memory effects as specified byVarHandle.compareAndExchangeAcquire(java.lang.Object...).- Parameters:
- i- the index
- expectedValue- the expected value
- newValue- the new value
- Returns:
- the witness value, which will be the same as the expected value if successful
- Since:
- 9
 
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compareAndExchangeReleasepublic final long compareAndExchangeRelease(int i, long expectedValue, long newValue) Atomically sets the element at indexitonewValueif the element's current value, referred to as the witness value,== expectedValue, with memory effects as specified byVarHandle.compareAndExchangeRelease(java.lang.Object...).- Parameters:
- i- the index
- expectedValue- the expected value
- newValue- the new value
- Returns:
- the witness value, which will be the same as the expected value if successful
- Since:
- 9
 
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weakCompareAndSetVolatilepublic final boolean weakCompareAndSetVolatile(int i, long expectedValue, long newValue) Possibly atomically sets the element at indexitonewValueif the element's current value== expectedValue, with memory effects as specified byVarHandle.weakCompareAndSet(java.lang.Object...).- Parameters:
- i- the index
- expectedValue- the expected value
- newValue- the new value
- Returns:
- trueif successful
- Since:
- 9
 
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weakCompareAndSetAcquirepublic final boolean weakCompareAndSetAcquire(int i, long expectedValue, long newValue) Possibly atomically sets the element at indexitonewValueif the element's current value== expectedValue, with memory effects as specified byVarHandle.weakCompareAndSetAcquire(java.lang.Object...).- Parameters:
- i- the index
- expectedValue- the expected value
- newValue- the new value
- Returns:
- trueif successful
- Since:
- 9
 
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weakCompareAndSetReleasepublic final boolean weakCompareAndSetRelease(int i, long expectedValue, long newValue) Possibly atomically sets the element at indexitonewValueif the element's current value== expectedValue, with memory effects as specified byVarHandle.weakCompareAndSetRelease(java.lang.Object...).- Parameters:
- i- the index
- expectedValue- the expected value
- newValue- the new value
- Returns:
- trueif successful
- Since:
- 9
 
 
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compareAndExchange(int, long, long)andcompareAndSet(int, long, long)).