If you have a series of facts
(fact (name a) (value 123))
(fact (name b) (value 456))
and write a query like
(defquery find-value
(declare (variables ?name))
(fact (name ?name)))
Then Jess will make an index on the "name" slot, so that looking up
these facts by name will be fast (using a hashtable, so basically
constant time.)
Does this answer your question?
I think Raji Sridar wrote:
> Hi,
>
> I am a new user of JESS and would like your inputs on implementing enumeration
> and lookup tables in JESS.
> The requirement is for a straight forward indexing mechanism to store and
> retrieve static data as:
> 1. Enumeration - To convert a codified value to its description
> 2. Table - To retrieve a set of attributes based on a key value
> I can have these as facts and use them directly in the rules or implement them
> through a java extension to JESS.
> If RETE is optimized for this, I would prefer to use them as facts.
> If not, based on your experience, I would like to know, which way is better for
> small number of facts ( say, < 20 ) and a larger number (say, 500) and for
> small sizes ( say 80 byte enumeration ) and larger sizes ( say, the total size
> of all attributes in the table is 1024 bytes ).
> Your input will help me decide on the better technique.
>
> Thanks
> Raji
>
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Ernest Friedman-Hill
Distributed Systems Research Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
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