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<DIV dir=ltr align=left><SPAN class=221175309-05022008><FONT face=Arial
color=#0000ff size=2>Obviously you know your requirments better than I, but the
following stateless example accommodates dynamic insertion of
facts:-</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=221175309-05022008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=221175309-05022008><FONT face=Arial
color=#0000ff size=2><STRONG><EM>DRL</EM></STRONG></FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=221175309-05022008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV><FONT face="Courier New" color=#0000ff size=2>package com.<SPAN
class=221175309-05022008>test</SPAN><BR> <BR>import <SPAN
class=221175309-05022008>com.test.</SPAN><SPAN
class=221175309-05022008>Fact1</SPAN>;<BR>import <SPAN
class=221175309-05022008>com.test.</SPAN><SPAN
class=221175309-05022008>Fact2</SPAN>;<BR> <BR>rule "<SPAN
class=221175309-05022008>Fact</SPAN>1"<BR> when<BR> <SPAN
class=221175309-05022008>Fact1</SPAN>()<BR> then<BR> System.out.println("<SPAN
class=221175309-05022008>Fact1</SPAN>");<BR> insert(new <SPAN
class=221175309-05022008>Fact</SPAN>2());<BR>end</FONT></DIV>
<DIV><FONT face="Courier New" color=#0000ff size=2></FONT> </DIV>
<DIV><FONT face="Courier New" color=#0000ff size=2>rule "<SPAN
class=221175309-05022008>Fact</SPAN>2"<BR> when<BR> <SPAN
class=221175309-05022008>Fact</SPAN>2(
)<BR> then<BR> System.out.println("<SPAN
class=221175309-05022008>Fact</SPAN>2"); <BR>end</FONT></DIV>
<DIV dir=ltr align=left><SPAN class=221175309-05022008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=221175309-05022008><FONT face=Arial
color=#0000ff size=2><STRONG><EM>Java</EM></STRONG></FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=221175309-05022008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=221175309-05022008><FONT face="Courier New"
color=#0000ff size=2>StatelessSession session =
ruleBase.newStatelessSession();</FONT></SPAN></DIV>
<DIV><SPAN class=221175309-05022008><FONT face="Courier New" color=#0000ff
size=2>session.execute(new Fact1());</FONT></SPAN></DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV>
<DIV><SPAN class=221175309-05022008></SPAN><FONT color=#0000ff><FONT
size=2><FONT face=Arial><STRONG><EM>C<SPAN
class=221175309-05022008>onsole</SPAN></EM></STRONG></FONT></FONT></FONT></DIV><FONT
face="Courier New"><FONT color=#0000ff><FONT size=2><SPAN
class=221175309-05022008></SPAN></FONT></FONT></FONT><FONT face="Courier New"
color=#0000ff size=2></FONT><FONT face="Courier New" color=#0000ff
size=2></FONT><FONT face="Courier New" color=#0000ff size=2></FONT>
<DIV><FONT face=Arial color=#0000ff size=2></FONT><FONT face=Arial color=#0000ff
size=2></FONT><BR><SPAN class=221175309-05022008><FONT face="Courier New"
color=#0000ff size=2>Fact1</FONT></SPAN></DIV>
<DIV><SPAN class=221175309-05022008><FONT face="Courier New" color=#0000ff
size=2>Fact2</FONT></SPAN></DIV>
<DIV class=OutlookMessageHeader lang=en-us align=left><SPAN
class=221175309-05022008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV class=OutlookMessageHeader lang=en-us align=left><SPAN
class=221175309-05022008><FONT face=Arial color=#0000ff size=2>Are you getting
(general) stateless sessions confused with sequential stateless
sessions?</FONT></SPAN></DIV>
<DIV class=OutlookMessageHeader lang=en-us align=left><SPAN
class=221175309-05022008></SPAN> </DIV>
<DIV class=OutlookMessageHeader lang=en-us align=left><SPAN
class=221175309-05022008><FONT face=Arial color=#0000ff size=2>With kind
regards,</FONT></SPAN></DIV>
<DIV class=OutlookMessageHeader lang=en-us align=left><SPAN
class=221175309-05022008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV class=OutlookMessageHeader lang=en-us align=left><SPAN
class=221175309-05022008><FONT face=Arial color=#0000ff
size=2>Mike</FONT> </SPAN></DIV>
<BLOCKQUOTE style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><SPAN
class=221175309-05022008> </SPAN></DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
</DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><FONT
face=Tahoma size=2><B>From:</B> rules-users-bounces@lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] <B>On Behalf Of </B>Jai
Vasanth<BR><B>Sent:</B> 04 February 2008 21:02<BR><B>To:</B> Rules Users
List<BR><B>Subject:</B> Re: [rules-users] Using the drools as the backend
engine for a service<BR></FONT><BR></DIV>
<DIV></DIV>As part of the rules evaluation, more objects are inserted into the
working memory. Even though I just insert 1 object after creating a session,
rule outcomes inside lead to more objects to be inserted. <BR>Correct me
if I am wrong, but I was under the impression that a stateless wouldnt be able
to automatically fire rules when we objects are inserted
dynamically<BR><BR>Thanks<BR><BR>Jai<BR><BR>
<DIV class=gmail_quote>On Feb 4, 2008 1:05 AM, Anstis, Michael (M.) <<A
href="mailto:manstis1@ford.com" target=_blank>manstis1@ford.com</A>>
wrote:<BR>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 0pt 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid">
<DIV>
<DIV dir=ltr align=left><SPAN><FONT face=Arial color=#0000ff size=2>IMHO,
you might achieve better scalability and resilience if you can make the
working memory stateless.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN><FONT face=Arial color=#0000ff size=2>I assume
your "service" to be a web-service over stateless-HTTP and not a service
exposed over a stateful protocol.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN><FONT face=Arial color=#0000ff
size=2>Cheers,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN><FONT face=Arial color=#0000ff
size=2>Mike</FONT></SPAN></DIV><BR>
<BLOCKQUOTE style="MARGIN-RIGHT: 0px">
<DIV lang=en-us dir=ltr align=left>
<HR>
<FONT face=Tahoma size=2>
<DIV><B>From:</B> <A href="mailto:rules-users-bounces@lists.jboss.org"
target=_blank>rules-users-bounces@lists.jboss.org</A> [mailto:<A
href="mailto:rules-users-bounces@lists.jboss.org"
target=_blank>rules-users-bounces@lists.jboss.org</A>] <B>On Behalf Of
</B>Jai Vasanth<BR></DIV><B>Sent:</B> 01 February 2008 22:05<BR><B>To:</B>
Rules Users List<BR><B>Subject:</B> Re: [rules-users] Using the drools as
the backend engine for a service<BR></FONT><BR></DIV>
<DIV>
<DIV></DIV>
<DIV>
<DIV></DIV>I must have not been clear, yes I was planning on instantiating
the rulebase when the service starts and instantiating a new session for
every request.<BR><BR><BR><BR>ONCE:<BR> <BR> RuleBase ruleBase =
RuleBaseFactory.newRuleBase();<BR>ruleBase.addPackage( pkg );<BR><BR>PER
REQUEST:<BR>Stateful session = ruleBase.newStatefulSession(); (Is
this what you were referring to as working memory ? )<BR><BR><BR>I hope
that looks ok.<BR><BR>Thanks<BR><BR>Jai <BR>
<DIV class=gmail_quote>On Feb 1, 2008 1:37 PM, Michael Rhoden <<A
href="mailto:mrhoden@franklinamerican.com"
target=_blank>mrhoden@franklinamerican.com</A>> wrote:<BR>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 0pt 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid">
<DIV lang=EN-US link="blue" vlink="purple">
<DIV>
<P><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">You would
likely NOT want to create a rulebase per session. Most people create
working memory per session. Rulebases should only be loaded once per
server (context) in my opinion, and you reload it as rules changes.
Loading a rulebase loads rules from a file, and orders your rete tree.
For our installation that takes several minutes.</SPAN></FONT></P>
<P><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Rulebase =
once</SPAN></FONT></P>
<P><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Working memory
= per user/transaction</SPAN></FONT></P>
<P><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">-Michael</SPAN></FONT></P>
<P><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<DIV>
<DIV style="TEXT-ALIGN: center" align=center><FONT
face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt">
<HR align=center width="100%" SIZE=2>
</SPAN></FONT></DIV>
<P><B><FONT face=Tahoma size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">From:</SPAN></FONT></B><FONT
face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">
<A href="mailto:rules-users-bounces@lists.jboss.org"
target=_blank>rules-users-bounces@lists.jboss.org</A> [mailto:<A
href="mailto:rules-users-bounces@lists.jboss.org"
target=_blank>rules-users-bounces@lists.jboss.org</A>] <B><SPAN
style="FONT-WEIGHT: bold">On Behalf Of </SPAN></B>Jai
Vasanth<BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Friday,
February 01, 2008 3:23 PM<BR><B><SPAN
style="FONT-WEIGHT: bold">To:</SPAN></B> Rules Users List<BR><B><SPAN
style="FONT-WEIGHT: bold">Subject:</SPAN></B> [rules-users] Using the
drools as the backend engine for a service</SPAN></FONT></P></DIV>
<DIV>
<DIV></DIV>
<DIV>
<P><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"></SPAN></FONT> </P>
<P><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt">Hi,<BR><BR> I am planning on using Drools
as the rules engine for a service that I am building. I am considering
instantiating a stateful session for every request to the service. The
RuleBase would be created when the service starts. Is this the correct
way to go about incorporating Drools in a service ? Is session
creation an expensive process and if so are there other efficient ways
of doing so ?<BR><BR><BR><BR>Thanks <BR><BR>Jai
</SPAN></FONT></P></DIV></DIV></DIV></DIV><BR>_______________________________________________<BR>rules-users
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target=_blank>https://lists.jboss.org/mailman/listinfo/rules-users</A><BR><BR></BLOCKQUOTE></DIV><BR></DIV></DIV></BLOCKQUOTE></DIV><BR>_______________________________________________<BR>rules-users
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