The email is big just because I tried to big as clear as possible, but it's a quick reading, I promise!<br><br>No one?<br><br>Cheers,<br>Leo.<br><br><div class="gmail_quote">On Tue, Nov 24, 2009 at 10:42 PM, Leonardo Gomes <span dir="ltr"><<a href="mailto:leonardo.f.gomes@gmail.com">leonardo.f.gomes@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Hello,<br><br>Regarding the session recreation, you're absolutely right, thanks!<br><br>
Anyway, I still have a problem and I believe it's more a design thing. Let me try to clarify it.<br><br>I have different types of facts, let's say:<br>
<br>* Types: FactA, FactB, FactC;<br>* A stateful session with rules operating on them;<br>* And a global variable, called output, which is a list of messages generated as consequences of those rules;<br>* From time to time, I get notified that a fact of type FactA changed, then I have to:<br>
- retract all facts of type FactA from my working memory<br> - reload them from the database (with java beans being created)<br> - reinsert them in that stateful session<br><br>Now, let's say FactA(1) indicates a fact of type FactA and id = 1.<br>
<br>- Then, in the beginning, I insert FactA(1) and FactA(2) in my working memory and fire the rules.<br>- I have several rules operating on different types of facts, but I'm interested in one rule in particular which operates against FactA and reads something like:<br>
<br>rule "test non existence"<br>when<br> not FactA( id == 4 )<br>then<br> output.add("there's no FactA id 4");<br><br>- This rule is fired and the message is added to my output object.<br><br>
Later on, I have a notification that a FactA has changed, then I:<br>- retract all FactAs from my working memory<br>- clear all FactA-related messages from my output object<br>- reload FactAs (let's say now I have FactA(1), FactA(3), but NOT FactA(4))<br>
- reinsert them in the WM<br>- fire the rules<br><br>The rule that checks that there's no FactA(4) doesn't refire. All other rules operating against FactA do, and since I had removed all FactA-related messages from my output object, this time I don't get the "there no FactA id 4" message in my output.<br>
<br>It sounds like a situation for a stateless session, but I actually have several different rules, operating on different types of facts and don't want to refire all rules, just because a fact of type A changed.<br>
<br>Maybe I should have an strategy of creating different sets of stateless sessions. I'm not sure. Advice is really welcome!<br><br>Thanks again.<br><br>Leo.<br><br><br><br><br><br><br><br><br><br><br><div class="gmail_quote">
2009/11/17 Edson Tirelli <span dir="ltr"><<a href="mailto:ed.tirelli@gmail.com" target="_blank">ed.tirelli@gmail.com</a>></span><div><div></div><div class="h5"><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<br> Leonardo, <br><br> First, I believer there is a misconception in your reasoning: creating sessions is supposed to be much much cheaper than retracting all facts. Creating a rulebase is heavier, because it requires compilation, but creating a session is supposed to be very light by design. So, first thing you should do is change that.<br>
<br> Regarding your question, if you insert:<div><br><br>SiteLanguage(language : languageCode)<br> t : SiteSpecialServiceType(type : specialServiceType)<br><br></div> The rule will activate and fire. If you don't, then the rule will not match. That is how it is supposed to work.<br>
<br> Edson<br><br><div class="gmail_quote">2009/11/17 Leonardo Gomes <span dir="ltr"><<a href="mailto:leonardo.f.gomes@gmail.com" target="_blank">leonardo.f.gomes@gmail.com</a>></span><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div><div></div><div>
Hi Guys,<br><br>I have the following situation while running a stateful session with Drools 4.0.7:<br><br>- I want to test that a fact with a given state doesn't exist;<br>- It works fine<br>- At a certain point I have to retract all facts and reinsert them at the stateful session - some of them actually changed and I don't want to recreate the session b/c it's expensive<br>
- Again the fact that didn't exist when I first created the session still doesn't exist<br><br>** Problem: This time the rule that verified the non-existence is not fired because I didn't insert any fact that would retrigger it.<br>
<br>Rule example:<br><br> rule "022"<br><br> when<br><br> SiteLanguage(language : languageCode)<br> t : SiteSpecialServiceType(type : specialServiceType)<br> not SiteLanguageSpecialServiceType(specialServiceType == type, languageCode == language)<br>
then<br> <<consequence>><br>end<br><br>How could I solve or workaround that?<br><br><br>Thanks in advance,<br>Leo.
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<br></blockquote></div><font color="#888888"><br><br clear="all"><br>-- <br> Edson Tirelli<br> JBoss Drools Core Development<br> JBoss by Red Hat @ <a href="http://www.jboss.com" target="_blank">www.jboss.com</a><br>
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