[rules-users] Caching results in temperory variables

[Wolfgang Laun]

On 13 August 2010 18:36, Manav <manav7574 at yahoo.com> wrote:

> Your explanation is absolutely superb.  I modified my drl as per your
> suggestions and it's just been completely transformed. Just one question
> regarding one suggestion below :
>
> -- is this something like a for each loop in java . This is the first
> example i have seen in drl
>

In a way, yes. Since
   Foo( ... )   # match any Foo according to constraints, if any
   Bar( ... )   # match any Bar according to constraints, if any
these two patterns produce the Cartesian product, such as a nested loop
does. BUT, the order of the pairings is indeterministic, and changes in WM
might influence this loop, even make it infinitive. Therefore, "in a way".

-- will this automatically iterate over as many languages as have been
> inserted ?
>

That's the whole idea :-)


> -- the inserts .. don't they have to be within a rule block ? or did you
> just omit other things to keep it simple
>

You can do it in the Java application framework. You can also write a
high-salience one-shot rule such as

rule "1st shot"
when
then

> insert( new Language( "Japanese" ) );
> insert( new Language( "French" ) );
> // more of the same
>
end

Cheers
Wolfgang
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