Re: [rules-users] Performance of rules in Drools
"More efficient" w.r.t. runtime, maintenance, development effort,...?
Writing individual rules is quick, bad for maintenance, and probably
best, if a session has only a few inputs as it starts fast from a
precompiled rule base.
Parameter facts take a little time for development, are very good for
maintenance (see below) and have a tolerable overhead if they are not
too numerous and/or the session runs long.
What should be considered is that a set of parameter facts can be
maintained by non-technical personnel, e.g., in a spreadsheet or in
some other data preparation tool. This could be a boon for long-ter
maintenance.
-W
On 21/03/2014, Seb Geek <geekseb(a)gmail.com> wrote:
Hello,
I have a list of very similar rules executed in Drools and some performance
problems appear ... I want some advices to choose between two "direction"
in order to correct them ...
First the context :
I have to execute always the same check but with different level or
"parameters".
For example,
- in the first demand (rule for our client) i have to count and retrieve
the list all Article that have a family code equals to 'A', 'B' or
'C' and
execute the then clause only if there is 3 elements in the filtered list.
- in the second demand (rule for our client) i have to count and retrieve
the list all Article that have a family code equals to 'B' or 'C' and
execute the then clause only if there is 4 elements in the filtered list
and so on ...
The number of different group of parameter values and the values of theses
parameters will change over time ...
The question is : is it more efficient to implement a lot of different
rules, each with their parameter in the code OR is it more efficient to
implement only one rule with an additional object as a drools fact
containing different parameter's values ?
Thanks for your help
Sébastien