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java.lang.Object
   |
   +----java.util.Observable
           |
           +----kh.util.ObservableNamedValue
                   |
                   +----kh.util.CachingNamedValue

Summary

public class  CachingNamedValue
     extends kh.util.ObservableNamedValue
{
          // Constructors 1
     public CachingNamedValue(Object, NamedValue, long) throws Exception;

          // Methods 2
     protected void finalize();
     public double getValue() throws Exception;
}

This data source maintains a cached copy of some other named value. The cached copy is updated periodically by referring to the master value. This feature is mostly needed for hardware based values which only need to be read occasionally, and have high IO cost for each read.

Constructors

· CachingNamedValue

Summary  |  Top

   public CachingNamedValue(Object name, 
                            NamedValue sourceValue, 
                            long updatePeriod)  throws Exception

Parameter	Description
name	the name given to our NamedValue
sourceValue	the place we get our values from
updatePeriod	the number of ms between updates from the master value

   protected void finalize() 

Overrides:

finalize in class Object

   public double getValue()  throws Exception

Update the value to reflect current reality and return the new value.

Overrides:

getValue in class ObservableNamedValue

Implements:

getValue in interface NamedValue

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