Documentation of 'edu.rit.pj.reduction.SharedByte' Java class
SharedByte
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edu.rit.pj.reduction

Class SharedByte

  • All Implemented Interfaces:
    java.io.Serializable

    public class SharedByte
extends java.lang.Number
    Class SharedByte provides a reduction variable for a value of type byte.

    Class SharedByte is multiple thread safe. The methods use lock-free atomic compare-and-set.

    Note: Class SharedByte is implemented using class java.util.concurrent.atomic.AtomicInteger. The byte value is stored as an int whose values are restricted to the range of type byte.

    See Also:
    Serialized Form

    • Constructor Summary

      Constructors 
      Constructor and Description
      SharedByte()
      Construct a new byte reduction variable with the initial value 0.
      SharedByte(byte initialValue)
      Construct a new byte reduction variable with the given initial value.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method and Description
      byte addAndGet(byte value)
      Add the given value to this reduction variable and return the new value.
      boolean compareAndSet(byte expect, byte update)
      Atomically set this reduction variable to the given updated value if the current value equals the expected value.
      byte decrementAndGet()
      Subtract one from this reduction variable and return the new value.
      double doubleValue()
      Returns this reduction variable's current value converted to type double.
      float floatValue()
      Returns this reduction variable's current value converted to type float.
      byte get()
      Returns this reduction variable's current value.
      byte getAndAdd(byte value)
      Add the given value to this reduction variable and return the previous value.
      byte getAndDecrement()
      Subtract one from this reduction variable and return the previous value.
      byte getAndIncrement()
      Add one to this reduction variable and return the previous value.
      byte getAndSet(byte value)
      Set this reduction variable to the given value and return the previous value.
      byte incrementAndGet()
      Add one to this reduction variable and return the new value.
      int intValue()
      Returns this reduction variable's current value converted to type int.
      long longValue()
      Returns this reduction variable's current value converted to type long.
      byte reduce(byte value, ByteOp op)
      Combine this reduction variable with the given value using the given operation.
      void set(byte value)
      Set this reduction variable to the given value.
      java.lang.String toString()
      Returns a string version of this reduction variable.
      boolean weakCompareAndSet(byte expect, byte update)
      Atomically set this reduction variable to the given updated value if the current value equals the expected value.

      • Methods inherited from class java.lang.Number

        byteValue, shortValue

      • Methods inherited from class java.lang.Object

        equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

    • Constructor Detail

      • SharedByte

        public SharedByte()
        Construct a new byte reduction variable with the initial value 0.

      • SharedByte

        public SharedByte(byte initialValue)
        Construct a new byte reduction variable with the given initial value.
        Parameters:
        initialValue - Initial value.

    • Method Detail

      • get

        public byte get()
        Returns this reduction variable's current value.
        Returns:
        Current value.

      • set

        public void set(byte value)
        Set this reduction variable to the given value.
        Parameters:
        value - New value.

      • getAndSet

        public byte getAndSet(byte value)
        Set this reduction variable to the given value and return the previous value.
        Parameters:
        value - New value.
        Returns:
        Previous value.

      • compareAndSet

        public boolean compareAndSet(byte expect,
                             byte update)
        Atomically set this reduction variable to the given updated value if the current value equals the expected value.
        Parameters:
        expect - Expected value.
        update - Updated value.
        Returns:
        True if the update happened, false otherwise.

      • weakCompareAndSet

        public boolean weakCompareAndSet(byte expect,
                                 byte update)
        Atomically set this reduction variable to the given updated value if the current value equals the expected value. May fail spuriously.
        Parameters:
        expect - Expected value.
        update - Updated value.
        Returns:
        True if the update happened, false otherwise.

      • getAndIncrement

        public byte getAndIncrement()
        Add one to this reduction variable and return the previous value.
        Returns:
        Previous value.

      • getAndDecrement

        public byte getAndDecrement()
        Subtract one from this reduction variable and return the previous value.
        Returns:
        Previous value.

      • getAndAdd

        public byte getAndAdd(byte value)
        Add the given value to this reduction variable and return the previous value.
        Parameters:
        value - Value to add.
        Returns:
        Previous value.

      • incrementAndGet

        public byte incrementAndGet()
        Add one to this reduction variable and return the new value.
        Returns:
        New value.

      • decrementAndGet

        public byte decrementAndGet()
        Subtract one from this reduction variable and return the new value.
        Returns:
        New value.

      • addAndGet

        public byte addAndGet(byte value)
        Add the given value to this reduction variable and return the new value.
        Parameters:
        value - Value to add.
        Returns:
        New value.

      • reduce

        public byte reduce(byte value,
                   ByteOp op)
        Combine this reduction variable with the given value using the given operation. The result is stored back into this reduction variable and is returned.
        Parameters:
        value - Value.
        op - Binary operation.
        Returns:
        (This variable) op (value).

      • toString

        public java.lang.String toString()
        Returns a string version of this reduction variable.
        Overrides:
        toString in class java.lang.Object
        Returns:
        String version.

      • intValue

        public int intValue()
        Returns this reduction variable's current value converted to type int.
        Specified by:
        intValue in class java.lang.Number
        Returns:
        Current value.

      • longValue

        public long longValue()
        Returns this reduction variable's current value converted to type long.
        Specified by:
        longValue in class java.lang.Number
        Returns:
        Current value.

      • floatValue

        public float floatValue()
        Returns this reduction variable's current value converted to type float.
        Specified by:
        floatValue in class java.lang.Number
        Returns:
        Current value.

      • doubleValue

        public double doubleValue()
        Returns this reduction variable's current value converted to type double.
        Specified by:
        doubleValue in class java.lang.Number
        Returns:
        Current value.
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