This is what I think is going on:when you call update($fact1) it will first retract $fact1 which in turn retracts $fact2, the $fact1 is then inserted again which cause another 'from' evaluation and a NEW $fact2 is pulled -> no-loop doesn't work because Drools sees it as different data I am just guessing here ...
On Fri, Feb 13, 2009 at 9:12 AM, Przemysław Różycki <[email protected]>wrote: > Hello, > > Doesn't really anyone have any logical explanation of why such a rule > loops? > > To remind the rule: > > rule "Hello World" > no-loop > when > $fact1 : MyFactBean1( ) > $fact2 : MyFactBean2( ) from $fact1 > then > System.out.println("Fired!!!"); > update($fact1); > end > > If I don't use 'from' everything is fine. > I really didn't find in a documentation, that 'from' causes any special > behaviour of the rule looping. > > Best regards, > -- > Przemysław Różycki > AMG.net, A Bull Group Company > ul. Łąkowa 29 > 90-554 Łódź > www.amg.net.pl > > > > Przemysław Różycki pisze: > > Thanks for answer, Vikrant, but I don't think so. I have always used >> no-loop without any additions and it worked (when I didn't use from). BTW, >> if you comment a condition with from, then the rule does not loop. I also >> checked with "no-loop true" and result is the same. >> >> Best regards, >> Przemek >> >> Vikrant Yagnick pisze: >> >>> I have to quickly recheck the documentation by I think you have to write >>> "no-loop true". Just writing no-loop defaults to false I guess. >>> >>> -----Original Message----- >>> From: [email protected] [mailto: >>> [email protected]] On Behalf Of Przemyslaw Rózycki >>> Sent: Tuesday, February 10, 2009 3:24 PM >>> To: Rules Users List >>> Subject: [rules-users] Rules with from always loops (Drools 4.0.7) >>> >>> Hello, >>> >>> why does such a rule always loop? Even if no-loop is used? >>> >>> rule "Hello World" >>> no-loop >>> when >>> $fact1 : MyFactBean1( ) >>> $fact2 : MyFactBean2( ) from $fact1 >>> then >>> System.out.println("Fired!!!"); >>> update($fact1); >>> end >>> >>> The full code of my test application and drl is attached. >>> >>> Best regards, >>> -- >>> Przemysław Różycki >>> AMG.net, A Bull Group Company >>> ul. Łąkowa 29 >>> 90-554 Łódź >>> www.amg.net.pl >>> >>> >>> MASTEK LTD. >>> Mastek is in NASSCOM's 'India Top 20' Software Service Exporters List. >>> In the US, we're called MAJESCOMASTEK >>> >>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >>> >>> Opinions expressed in this e-mail are those of the individual and not >>> that of Mastek Limited, unless specifically indicated to that effect. Mastek >>> Limited does not accept any responsibility or liability for it. This e-mail >>> and attachments (if any) transmitted with it are confidential and/or >>> privileged and solely for the use of the intended person or entity to which >>> it is addressed. Any review, re-transmission, dissemination or other use of >>> or taking of any action in reliance upon this information by persons or >>> entities other than the intended recipient is prohibited. This e-mail and >>> its attachments have been scanned for the presence of computer viruses. It >>> is the responsibility of the recipient to run the virus check on e-mails and >>> attachments before opening them. If you have received this e-mail in error, >>> kindly delete this e-mail from desktop and server. >>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >>> >>> >>> >>> _______________________________________________ >>> rules-users mailing list >>> [email protected] >>> https://lists.jboss.org/mailman/listinfo/rules-users >>> >>> >> _______________________________________________ >> rules-users mailing list >> [email protected] >> https://lists.jboss.org/mailman/listinfo/rules-users >> >> > > _______________________________________________ > rules-users mailing list > [email protected] > https://lists.jboss.org/mailman/listinfo/rules-users >
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