Class SynchronizedDouble

java.lang.Object
EDU.oswego.cs.dl.util.concurrent.SynchronizedVariable
EDU.oswego.cs.dl.util.concurrent.SynchronizedDouble
All Implemented Interfaces:
Executor, Cloneable, Comparable
Direct Known Subclasses:
WaitableDouble
public class SynchronizedDouble extends SynchronizedVariable implements Comparable, Cloneable
A class useful for offloading synch for double instance variables.

[ Introduction to this package. ]

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    protected double
    value_
     

    Fields inherited from class SynchronizedVariable

    lock_

  • Constructor Summary

    Constructors
    Constructor
    Description
    SynchronizedDouble(double initialValue)
    Make a new SynchronizedDouble with the given initial value, and using its own internal lock.
    SynchronizedDouble(double initialValue, Object lock)
    Make a new SynchronizedDouble with the given initial value, and using the supplied lock.

  • Method Summary

    Modifier and Type
    Method
    Description
    double
    add(double amount)
    Add amount to value (i.e., set value += amount)
    boolean
    commit(double assumedValue, double newValue)
    Set value to newValue only if it is currently assumedValue.
    int
    compareTo(double other)
     
    int
    compareTo(SynchronizedDouble other)
     
    int
    compareTo(Object other)
     
    double
    divide(double factor)
    Divide value by factor (i.e., set value /= factor)
    boolean
    equals(Object other)
     
    final double
    get()
    Return the current value
    int
    hashCode()
     
    double
    multiply(double factor)
    Multiply value by factor (i.e., set value *= factor)
    double
    set(double newValue)
    Set to newValue.
    double
    subtract(double amount)
    Subtract amount from value (i.e., set value -= amount)
    double
    swap(SynchronizedDouble other)
    Atomically swap values with another SynchronizedDouble.
    String
    toString()
     

    Methods inherited from class SynchronizedVariable

    execute, getLock

    Methods inherited from class Object

    clone, finalize, getClass, notify, notifyAll, wait, wait, wait

  • Field Details

    • value_

      protected double value_

  • Constructor Details

    • SynchronizedDouble

      public SynchronizedDouble(double initialValue)
      Make a new SynchronizedDouble with the given initial value, and using its own internal lock.

    • SynchronizedDouble

      public SynchronizedDouble(double initialValue, Object lock)
      Make a new SynchronizedDouble with the given initial value, and using the supplied lock.

  • Method Details

    • get

      public final double get()
      Return the current value

    • set

      public double set(double newValue)
      Set to newValue.
      Returns:
      the old value

    • commit

      public boolean commit(double assumedValue, double newValue)
      Set value to newValue only if it is currently assumedValue.
      Returns:
      true if successful

    • swap

      public double swap(SynchronizedDouble other)
      Atomically swap values with another SynchronizedDouble. Uses identityHashCode to avoid deadlock when two SynchronizedDoubles attempt to simultaneously swap with each other. (Note: Ordering via identyHashCode is not strictly guaranteed by the language specification to return unique, orderable values, but in practice JVMs rely on them being unique.)
      Returns:
      the new value

    • add

      public double add(double amount)
      Add amount to value (i.e., set value += amount)
      Returns:
      the new value

    • subtract

      public double subtract(double amount)
      Subtract amount from value (i.e., set value -= amount)
      Returns:
      the new value

    • multiply

      public double multiply(double factor)
      Multiply value by factor (i.e., set value *= factor)
      Returns:
      the new value

    • divide

      public double divide(double factor)
      Divide value by factor (i.e., set value /= factor)
      Returns:
      the new value

    • compareTo

      public int compareTo(double other)

    • compareTo

      public int compareTo(SynchronizedDouble other)

    • compareTo

      public int compareTo(Object other)
      Specified by:
      compareTo in interface Comparable

    • equals

      public boolean equals(Object other)
      Overrides:
      equals in class Object

    • hashCode

      public int hashCode()
      Overrides:
      hashCode in class Object

    • toString

      public String toString()
      Overrides:
      toString in class Object