Re: [rules-users] In drools what is the exact difference between Insert and Update ??

Even attentive followers of this list may not be aware of my boot camp "Rule-Based Programming Design Patterns" I was delivering to a select few last October at Rules Fest 2011 <http://intellifest.org/html/agenda.html>;. I'm convinced that programming with rules follows the same universal principles we all have learned about programming since the 1950ies or have been taught in the ensuing decades - most notably, design patterns that can be applied as the situation demands. It may be a different grass, but it's still the grass roots you've got to make your own. -W 2012/3/29 Vincent LEGENDRE <vincent.legendre(a)eurodecision.com&gt; > Drools expert doc has a first chapter that adresses these questions > (section 1.2), or at least the questions that must be asked at start of a > project. > It covers in details the main key question : rules or not ? Using rules > implies more constraints on IT because you allow more freedom in business > logic part, so you need a more robust IT code. > > Best pratices are then edicted by the architect, this last one having in > mind the requirements of : > - business users (most important as they specify rules, at least some > representatives samples), > - the people who will write the rules (very very important if they > are the business users, who are not IT guys, which to me forbid the usage > of salience or groups or functions ...) > - the other IT guys that will provide data streams to your new > application, or who will call your app (it can bring constraints because of > data volumetry by instance) > > In fact, you can't start a real rule project without having enough > material in specifications, but this is also true for any project. > So there is no (in my opinion) "global best pratices" (as there is no > global best pratices for a random IT project...), with eventually an > exception for no-loop (its usage generally shows a lack of design, again, > it is my opinion, and I already used them anyway...). > Once again, as Davide said, it depends of the usage. So it seems barely > impossible to edit (and keep up to date) such a section with all potential > use-cases ... > > May be create a rule application that deduce best pratices ;) ? > > ------------------------------ > *De: *"Patrik Dufresne" <ikus060(a)gmail.com&gt; > *À: *"Rules Users List" <rules-users(a)lists.jboss.org&gt; > *Envoyé: *Jeudi 29 Mars 2012 15:20:21 > *Objet: *Re: [rules-users] In drools what is the exact difference > between Insert and Update ?? > > Sorry to disrupt your discussion, > > I've start using Drools a while ago and I find your discussion very > interesting about how to use what feature when and why. The current Drools > Expert user guide is very nice, but it miss this crucial information. May I > suggest to create a 'Best Practice' chapter with the recommendation you > made. > > Patrik Dufresne > > > On Thu, Mar 29, 2012 at 8:21 AM, Vincent LEGENDRE < > vincent.legendre(a)eurodecision.com&gt; wrote: > >> Far much valuable reply than mine :) >> A great summary of common concerns that must be evaluated before >> starting coding a rule system. >> >> Also consider : >> - using rule flow (if you are allowed to) >> - use sequential mode and pipe your data 'in the next rule box' >> programmatically (using rules?) >> - ask your architect ? He is true for no-loop, but for others, >> re-writing existing DRL code that used all that stuff, and throw all at >> once is farly more dangerous ... >> >> >> "remove all salience from rules and make the rules independent >> (don't decide its execution flow)" >> >> This is all the question. >> It mainly depends of the usage, as Davide said. >> It also depends of who is authoring/specifying rules : if the guy >> supposes some flow, he is not writing independant rules ... >> >> these other rules depend of the first : >> 2.no drools functions >> 3.Activation group / ruleflow / salience ... >> 5.don't call any java function (thus no functions at all, no >> predicates/utils methods, only DSL? only POJO?). >> >> this one is suspect ... >> 4.Don't use UPDATE and Global in drools . >> _______________________________________________ >> rules-users mailing list >> rules-users(a)lists.jboss.org >> https://lists.jboss.org/mailman/listinfo/rules-users >> > > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users