No the rule is run multiple times, once per a matching A. If you did only want the rule to run once regardless of how many matching As you have then you would use exists: Exists A( property == "123" )
From: rules-users-boun...@lists.jboss.org [mailto:rules-users-boun...@lists.jboss.org] On Behalf Of Justin Beltran Sent: 21 July 2010 16:47 To: 'Rules Users List' Subject: Re: [rules-users] Rules not firing when expected after retracting object in list Thanks for the reply. What if you have multiple A's set with 123? Don't you need to collect them to retract all A's that match that property? My main concern is if you retract one or more of the A's, it's possible that you should still have some A's that are NOT retracted, so rule B should still fire right? Justin From: rules-users-boun...@lists.jboss.org [mailto:rules-users-boun...@lists.jboss.org] On Behalf Of Swindells, Thomas Sent: Wednesday, July 21, 2010 8:39 AM To: Rules Users List Subject: Re: [rules-users] Rules not firing when expected after retracting object in list Why is rule 1 written the way it is? Why can't you just do: rule "Rule 1 - Remove all A's that have property set to 123" salience 1000 when $anA : A( property == "123" ) then retract ($anA) end Thomas From: rules-users-boun...@lists.jboss.org [mailto:rules-users-boun...@lists.jboss.org] On Behalf Of Justin Beltran Sent: 21 July 2010 16:28 To: rules-users@lists.jboss.org Subject: [rules-users] Rules not firing when expected after retracting object in list Hi, I'm coming across some weird behavior in Drools 4.0.7, but maybe it's just cause I don't understand I how Drools works. Assume, there's a class "A" that has a property called "property". As facts, I have the following list of A's: A1, property = 123 A2, property = 345 A3, property = 123 I have two rules as follows: rule "Rule 1 - Remove all A's that have property set to 123" salience 1000 lock-on-active true when $listOfAs : ArrayList collect(A( property == "123" )) then for (Object a: $listOfAs ) { retract (a) } end rule "Rule 2 - Do stuff with remaining A's" salience 900 lock-on-active true when $listOfAs : ArrayList collect(A()) then ... end My understanding is "Rule 1" will remove the facts of class A that have property to 123. When it gets to "Rule 2", shouldn't the "listOfAs" only have that one A that remains (i.e. the one where property is set to "345"). What I'm noticing is that "Rule 2" just doesn't execute at all even though I'm assuming there is still one "A" object that hasn't been retracted. If I comment out the "retract" it executes "Rule 2" fine. Am I missing something about these rules work? Thanks. Justin ________________________________ ************************************************************************************** This message is confidential and intended only for the addressee. If you have received this message in error, please immediately notify the postmas...@nds.com and delete it from your system as well as any copies. The content of e-mails as well as traffic data may be monitored by NDS for employment and security purposes. To protect the environment please do not print this e-mail unless necessary. NDS Limited. Registered Office: One London Road, Staines, Middlesex, TW18 4EX, United Kingdom. A company registered in England and Wales. Registered no. 3080780. VAT no. GB 603 8808 40-00 ************************************************************************************** ________________________________ ************************************************************************************** This message is confidential and intended only for the addressee. If you have received this message in error, please immediately notify the postmas...@nds.com and delete it from your system as well as any copies. The content of e-mails as well as traffic data may be monitored by NDS for employment and security purposes. To protect the environment please do not print this e-mail unless necessary. NDS Limited. Registered Office: One London Road, Staines, Middlesex, TW18 4EX, United Kingdom. A company registered in England and Wales. Registered no. 3080780. VAT no. GB 603 8808 40-00 **************************************************************************************
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