[rules-users] drools arithmetics without eval()

[Wolfgang Laun]

You can rewrite this rule like this (if I managed to juggle the inequality
correctly):

   client: Client()
   contextProd: PortfolioProduct(prodAdded == true, productId
=="PROFESSIONAL")
   Number(qty_00001: intValue* == 1* ) from accumulate(pp:
PortfolioProduct(productId in ("BOX_001"), prodAdded == true), count(pp))
   Number(qty_00002: intValue) from accumulate(pp:
PortfolioProduct(productId in ("BOX_002"), prodAdded == true), count(pp))
   Number(qty_00003: intValue) from accumulate(pp:
PortfolioProduct(productId in ("BOX_003"), prodAdded == true), count(pp))
   Number(qty_00004: intValue) from accumulate(pp:
PortfolioProduct(productId in ("BOX_004"), prodAdded == true), count(pp))
   Number(qty_00005: intValue *> qty_00002 - qty_00003 - qty_00004* )
      from accumulate(pp: PortfolioProduct(productId in ("BOX_005"),
prodAdded == true), count(pp))

Especially the == 1in the first Number should block additional useless work.

But the performance hit might also be due to the excessive use of
accumulate.

-W



On 13 March 2012 20:12, fx242 <drools at fx242.com> wrote:

> I have a question regarding eval() use. My rulebase is around ~3k rules,
> most
> of them are auto-generated by templates, and they end up looking like this:
>
> rule "CONFIG_114"
>    salience 0
> when
>    client: Client()
>    contextProd: PortfolioProduct(prodAdded == true, productId ==
> "PROFESSIONAL")
>    Number(qty_00001: intValue) from accumulate(pp:
> PortfolioProduct(productId in ("BOX_001"), prodAdded == true), count(pp))
>    Number(qty_00002: intValue) from accumulate(pp:
> PortfolioProduct(productId in ("BOX_002"), prodAdded == true), count(pp))
>    Number(qty_00003: intValue) from accumulate(pp:
> PortfolioProduct(productId in ("BOX_003"), prodAdded == true), count(pp))
>    Number(qty_00004: intValue) from accumulate(pp:
> PortfolioProduct(productId in ("BOX_004"), prodAdded == true), count(pp))
>    Number(qty_00005: intValue) from accumulate(pp:
> PortfolioProduct(productId in ("BOX_005"), prodAdded == true), count(pp))
>    eval(qty_00001 == 1)
>    not(eval(qty_00002 >= (qty_00003 + qty_00004 + qty_00005)))
> then
>    balance(kcontext, contextProd, qty_00002, ">=", (qty_00003 + qty_00004 +
> qty_00005));
> end
>
> These rules have all one or two evals in the end, comparing product
> quantities that are present in the Working Memory.
> My question is: Is there any better way to write this kind of rules without
> resorting to eval()?
> I'm currently getting hit (in performance terms) by over-using these, so I
> wonder if there is a  better way to do this.
> Thanks!
>
> Tiago Lopes
>
>
>
>
> --
> View this message in context:
> http://drools.46999.n3.nabble.com/drools-arithmetics-without-eval-tp3823232p3823232.html
> Sent from the Drools: User forum mailing list archive at Nabble.com.
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