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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Little confused about the third question I
had<st1:PersonName w:st="on">,</st1:PersonName> about rules compilation. I now
know that rules are to be compiled. When I use Guvnor<st1:PersonName w:st="on">,</st1:PersonName>
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. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>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 ? <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Regards<st1:PersonName w:st="on">,</st1:PersonName><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
11.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Abhay Chaware<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color=navy face=Arial><span style='font-size:
7.5pt;font-family:Arial;color:navy'>Sr. Designer | KPIT Cummins Infosystems Ltd
| Board: +91 020 6652 5000 | Extn: 2989 | abhay.chaware@kpitcummins.com
|www.kpitcummins.com </span></font><font color=navy><span
style='color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=5 color=green face=Webdings><span style='font-size:18.0pt;font-family:
Webdings;color:green'>P</span></font><font size=2 color=black face=Webdings><span
style='font-size:11.0pt;font-family:Webdings;color:black'> </span></font><font
size=1 color=green face=Tahoma><span style='font-size:7.5pt;font-family:Tahoma;
color:green'>Please consider the environment before printing this e-mail</span></font><o:p></o:p></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
rules-users-bounces@lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] <b><span style='font-weight:bold'>On
Behalf Of </span></b>Wolfgang Laun<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday<st1:PersonName
w:st="on">,</st1:PersonName> May 17<st1:PersonName w:st="on">,</st1:PersonName>
2011 3:31 PM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">Rules
Users List</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [rules-users] Drools
and threads</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>2011/5/17 Abhay B. Chaware <<a
href="mailto:Abhay.Chaware@kpitcummins.com">Abhay.Chaware@kpitcummins.com</a>><o:p></o:p></span></font></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Hi</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>I have few
questions about Drools.</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Are rules
compiled<st1:PersonName w:st="on">,</st1:PersonName> partially compiled or
interpreted ?</span></font><o:p></o:p></p>
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</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
Rules are indeed compiled<st1:PersonName w:st="on">,</st1:PersonName> but any
system where the order of execution<br>
is so highly dynamic has to do some operation in an interpretative mode.<br>
<br>
<o:p></o:p></span></font></p>
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margin-left:4.8pt;margin-right:0in'>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>When I call
fireAllRules()<st1:PersonName w:st="on">,</st1:PersonName> 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 ?</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
No special thread is created. fireAllRules() returns when no more rule
activations are to be "fired".<br>
<o:p></o:p></span></font></p>
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margin-left:4.8pt;margin-right:0in'>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Also<st1:PersonName
w:st="on">,</st1:PersonName> 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 ?</span></font><o:p></o:p></p>
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</blockquote>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
When a rule activation is executed<st1:PersonName w:st="on">,</st1:PersonName>
the code of the consequence frequently changes one or more facts. This results
in reevaluations of rule conditions<st1:PersonName w:st="on">,</st1:PersonName>
etc. This is just the way Drools works.<br>
<br>
-W<br>
<br>
<br>
<o:p></o:p></span></font></p>
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margin-left:4.8pt;margin-right:0in'>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>-abhay<o:p></o:p></span></font></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br clear=all>
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