Hi I have few questions about Drools. Are rules compiled, partially compiled or interpreted ?

When I call fireAllRules(), does it ( or can it ) create a new thread that runs parallely or the operation is sequential and the caller program HAS TO wait till all rules execution is done ?

Also, How is the application data integrity guarantied? E.g. what happens when some of the facts are changed in middle of rules being executed .. ? what should happen ?

-abhay This message contains information that may be privileged or confidential and is the property of the KPIT Cummins Infosystems Ltd. It is intended only for the person to whom it is addressed. If you are not the intended recipient, you are not authorized to read, print, retain copy, disseminate, distribute, or use this message or any part thereof. If you receive this message in error, please notify the sender immediately and delete all copies of this message. KPIT Cummins Infosystems Ltd. does not accept any liability for virus infected mails. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

Little confused about the third question I had, about rules compilation. I now know that rules are to be compiled. When I use Guvnor, I have to package the rules ( this is where they are compiled into binary format ) and download the package file and feed it into the production memory / knowledge base using changesets/agents. But I have also seen examples of drools and also created a few ones where I build the eclipse project and package the entire app as webapp ( .war ) and the rules file is in the classes/lib directory as a .drl file. ( uncompiled ). And it still works ! Does the drools runtime compile it at runtime ? and then uses it or what ? Regards, Abhay Chaware Sr. Designer | KPIT Cummins Infosystems Ltd | Board: +91 020 6652 5000 | Extn: 2989 | abhay.chaware(a)kpitcummins.com |www.kpitcummins.com P Please consider the environment before printing this e-mail ------------------------------ *From:* rules-users-bounces(a)lists.jboss.org [mailto: rules-users-bounces(a)lists.jboss.org] *On Behalf Of *Wolfgang Laun *Sent:* Tuesday, May 17, 2011 3:31 PM *To:* Rules Users List *Subject:* Re: [rules-users] Drools and threads 2011/5/17 Abhay B. Chaware <Abhay.Chaware(a)kpitcummins.com&gt; Hi I have few questions about Drools. Are rules compiled, partially compiled or interpreted ? Rules are indeed compiled, but any system where the order of execution is so highly dynamic has to do some operation in an interpretative mode. When I call fireAllRules(), does it ( or can it ) create a new thread that runs parallely or the operation is sequential and the caller program HAS TO wait till all rules execution is done ? No special thread is created. fireAllRules() returns when no more rule activations are to be "fired". Also, How is the application data integrity guarantied? E.g. what happens when some of the facts are changed in middle of rules being executed .. ? what should happen ? When a rule activation is executed, the code of the consequence frequently changes one or more facts. This results in reevaluations of rule conditions, etc. This is just the way Drools works. -W -abhay This message contains information that may be privileged or confidential and is the property of the KPIT Cummins Infosystems Ltd. It is intended only for the person to whom it is addressed. If you are not the intended recipient, you are not authorized to read, print, retain copy, disseminate, distribute, or use this message or any part thereof. If you receive this message in error, please notify the sender immediately and delete all copies of this message. KPIT Cummins Infosystems Ltd. does not accept any liability for virus infected mails. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users This message contains information that may be privileged or confidential and is the property of the KPIT Cummins Infosystems Ltd. It is intended only for the person to whom it is addressed. If you are not the intended recipient, you are not authorized to read, print, retain copy, disseminate, distribute, or use this message or any part thereof. If you receive this message in error, please notify the sender immediately and delete all copies of this message. KPIT Cummins Infosystems Ltd. does not accept any liability for virus infected mails. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

Correct. But does it then internally build the DRL into binary/compiled format and then uses it for updating knowledge base ?

------------------------------ *From:* rules-users-bounces(a)lists.jboss.org [mailto: rules-users-bounces(a)lists.jboss.org] *On Behalf Of *Wolfgang Laun *Sent:* Thursday, May 19, 2011 11:59 AM *To:* Rules Users List *Subject:* Re: [rules-users] Drools and threads You can feed a KnowledgeBuilder with a number of data formats, DRL being just one of them. The full standard procedurefor building is to add one or more resources to the builder (indicating its type), check for errors and create a KnowledgeBase; then proceed with a session, etc. -W 2011/5/19 Abhay B. Chaware <Abhay.Chaware(a)kpitcummins.com&gt; Little confused about the third question I had, about rules compilation. I now know that rules are to be compiled. When I use Guvnor, I have to package the rules ( this is where they are compiled into binary format ) and download the package file and feed it into the production memory / knowledge base using changesets/agents. But I have also seen examples of drools and also created a few ones where I build the eclipse project and package the entire app as webapp ( .war ) and the rules file is in the classes/lib directory as a .drl file. ( uncompiled ). And it still works ! Does the drools runtime compile it at runtime ? and then uses it or what ? Regards, Abhay Chaware Sr. Designer | KPIT Cummins Infosystems Ltd | Board: +91 020 6652 5000 | Extn: 2989 | abhay.chaware(a)kpitcummins.com |www.kpitcummins.com P Please consider the environment before printing this e-mail ------------------------------ *From:* rules-users-bounces(a)lists.jboss.org [mailto: rules-users-bounces(a)lists.jboss.org] *On Behalf Of *Wolfgang Laun *Sent:* Tuesday, May 17, 2011 3:31 PM *To:* Rules Users List *Subject:* Re: [rules-users] Drools and threads 2011/5/17 Abhay B. Chaware <Abhay.Chaware(a)kpitcummins.com&gt; Hi I have few questions about Drools. Are rules compiled, partially compiled or interpreted ? Rules are indeed compiled, but any system where the order of execution is so highly dynamic has to do some operation in an interpretative mode. When I call fireAllRules(), does it ( or can it ) create a new thread that runs parallely or the operation is sequential and the caller program HAS TO wait till all rules execution is done ? No special thread is created. fireAllRules() returns when no more rule activations are to be "fired". Also, How is the application data integrity guarantied? E.g. what happens when some of the facts are changed in middle of rules being executed .. ? what should happen ? When a rule activation is executed, the code of the consequence frequently changes one or more facts. This results in reevaluations of rule conditions, etc. This is just the way Drools works. -W -abhay This message contains information that may be privileged or confidential and is the property of the KPIT Cummins Infosystems Ltd. It is intended only for the person to whom it is addressed. If you are not the intended recipient, you are not authorized to read, print, retain copy, disseminate, distribute, or use this message or any part thereof. If you receive this message in error, please notify the sender immediately and delete all copies of this message. KPIT Cummins Infosystems Ltd. does not accept any liability for virus infected mails. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users This message contains information that may be privileged or confidential and is the property of the KPIT Cummins Infosystems Ltd. It is intended only for the person to whom it is addressed. If you are not the intended recipient, you are not authorized to read, print, retain copy, disseminate, distribute, or use this message or any part thereof. If you receive this message in error, please notify the sender immediately and delete all copies of this message. KPIT Cummins Infosystems Ltd. does not accept any liability for virus infected mails. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users This message contains information that may be privileged or confidential and is the property of the KPIT Cummins Infosystems Ltd. It is intended only for the person to whom it is addressed. If you are not the intended recipient, you are not authorized to read, print, retain copy, disseminate, distribute, or use this message or any part thereof. If you receive this message in error, please notify the sender immediately and delete all copies of this message. KPIT Cummins Infosystems Ltd. does not accept any liability for virus infected mails. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users