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<p class=MsoNormal style='text-autospace:none'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>I’ve written this rule to be
fired for Configuration object whose category is selected and subcategories are
yet not selected. <o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>rule</span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> "select sub
categories"<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'> salience
50<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'> no-loop<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'> when<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'> $conf
: Configuration($categoryId : $conf.getCategory().getCategoryId() != null,
subCategories == null )<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'> $subcats
: ArrayList() from collect (Category ( parent1 == $categoryId ) )<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'> then
<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'> $conf.setSubCategories($subcats);<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>end</span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>but it gives me following error.<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>[34,56]: [ERR 101] Line 34:56 no
viable alternative at input ')' in rule "select sub categories" in
pattern Configuration<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>[34,57]: [ERR 102] Line 34:57
mismatched input '.' expecting ')' in rule "select sub categories" in
pattern Configuration<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>[34,74]: [ERR 102] Line 34:74
mismatched input '!=' expecting 'then' in rule "select sub
categories" in pattern Configuration<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Do I need to use “eval” around the “$conf.getCategory().getCategoryId()”
part ? Also in that case how do I get access to the property value ? It
doesn’t support something like this :<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-indent:.5in;text-autospace:none'><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-indent:.5in;text-autospace:none'><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>$conf :
Configuration($categoryId : eval( $conf.getCategory().getCategoryId() != null ),
subCategories == null )<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Regards,<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Abhay<o:p></o:p></span></font></p>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<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>Wendy Mungovan<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, May 10, 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] FW:
Basic rules question</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>
<div>
<div>
<p class=MsoNormal><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial'>Abhay,<br>
You can use the normal Java gets (if your object has them).<br>
<o:p></o:p></span></font></p>
</div>
<div>
<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'>when <o:p></o:p></span></font></p>
<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'>
$prod : Product ($prod.getMemory().getRam().getType() == "DDR")<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial'>...<br>
<br>
instead of $prod.getMemory()... you I think should also be able to use
'this.getMemory()....'<br>
<br>
(I have not tried these out to make sure)<br>
<br>
Wendy<o:p></o:p></span></font></p>
<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'><o:p> </o:p></span></font></p>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
<hr size=1 width="100%" align=center>
</span></font></div>
<p class=MsoNormal style='margin-bottom:12.0pt'><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'> Abhay B.
Chaware <Abhay.Chaware@kpitcummins.com><br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">Rules
Users List</st1:PersonName> <rules-users@lists.jboss.org><br>
<b><span style='font-weight:bold'>Sent:</span></b> Mon, May 9, 2011 11:56:42 PM<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [rules-users] FW:
Basic rules question</span></font><o:p></o:p></p>
<div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>OK. Another one. How do I access and
use a property of a member variable ( object ) of an object, in rules ? </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>e.g. in the same example, I need to
check </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>1) if a product of type
‘laptop’ is inserted in memory AND</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>2) if the product’s MEMORY
property ( object ) has an object of type DDR ram attached.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>In other words, here is the relationship
of facts - </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>PRODUCT has member variable MEMORY ( which
is an object ) </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>MEMORY has member variable RAM ( which is
again an object )</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>RAM has member variable TYPE ( which
should be equal to “DDR” )</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>From within rules ‘when’ part,
how do I check if there is a PRODUCT inserted in memory whose MEMORY has a RAM
of type DDR assigned ?</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><o:p></o:p></p>
<div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Regards,</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
11.0pt;font-family:Arial;color:navy'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Abhay Chaware</span></font><o:p></o:p></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 |<a
href="http://www.kpitcummins.com" target="_blank">www.kpitcummins.com</a> </span></font><o:p></o:p></p>
<p class=MsoNormal><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>
</div>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<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>Michael Anstis<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, May 09, 2011 4:27 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] FW: Basic
rules question</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'>Yes :)<o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>2011/5/9 Abhay B. Chaware <<a
href="mailto:Abhay.Chaware@kpitcummins.com" target="_blank"
ymailto="mailto:Abhay.Chaware@kpitcummins.com">Abhay.Chaware@kpitcummins.com</a>><o:p></o:p></span></font></p>
<div>
<div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Mike,<o:p></o:p></span></font></p>
<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><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>What I meant was, There are say 10 objects of RAM in memory whose type
is DDR. Now my “Product” object has a member variable named
“compatibleRAMs”, and I would like to set an arraylist containing
these 10 objects to the “compatibleRAMs” variable of
“Product” object in memory.<o:p></o:p></span></font></p>
<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><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>I am reading about the “collect” which can be used to
create collections from fact objects in memory. Something like.<o:p></o:p></span></font></p>
<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><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>When <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>
$prod : Product (type==’laptop’)<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-indent:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>$compatibleRAMs : ArrayList() from collect (RAM (type
== ‘DDR’)) <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Then<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>
$prod.setCompatibleRAMs($compatibleRAMs);<o:p></o:p></span></font></p>
<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><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Am I on the right track ?<o:p></o:p></span></font></p>
<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><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>-abhay<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center>
</span></font></div>
<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'> <a
href="mailto:rules-users-bounces@lists.jboss.org" target="_blank"
ymailto="mailto:rules-users-bounces@lists.jboss.org">rules-users-bounces@lists.jboss.org</a>
[mailto:<a href="mailto:rules-users-bounces@lists.jboss.org" target="_blank"
ymailto="mailto:rules-users-bounces@lists.jboss.org">rules-users-bounces@lists.jboss.org</a>]
<b><span style='font-weight:bold'>On Behalf Of </span></b>Michael Anstis<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, May 09, 2011 3:52 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] FW:
Basic rules question</span></font><o:p></o:p></p>
</div>
<div>
<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'>Abhay,<br>
<br>
Do you need a list?<br>
<br>
You can assign RAM to COMPUTERS with this:-<br>
<br>
</span></font><font face="Courier New"><span style='font-family:"Courier New"'>when<br>
$c : Computer( $type : type )<br>
$r : RAM( compatibleWith == $type )<br>
then<br>
$c.addRAM( $r );<br>
end<br>
</span></font><br>
This would add all RAM (in Working Memory) compatible with COMPUTER to
computer.<br>
<br>
You could use a list of RAM as a Fact in WM and change your rule to use that:-<br>
<br>
<font face="Courier New"><span style='font-family:"Courier New"'>when<br>
$l : MyList( )<br>
$c : Computer( $type : type )<br>
$r : RAM( compatibleWith == $type ) from $l<br>
then<br>
$c.addRAM( $r );<br>
end<br>
</span></font><br>
Or you can define a rule to construct the list too:-<br>
<br>
<font face="Courier New"><span style='font-family:"Courier New"'>when<br>
$l : MyList( $t : typeRAM )<br>
RAM( $c : $t )<br>
then<br>
$l.add( $r )<br>
end</span></font><br>
<br>
I assume you'd need to differentiate different lists for different types; so I
have shown use of "MyList" which could subclass ArrayList and have a
"Type of RAM" attribute. Drools doesn't "do" generics.<br>
<br>
With kind regards,<br>
<br>
Mike<o:p></o:p></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>2011/5/9 Abhay B. Chaware <<a
href="mailto:Abhay.Chaware@kpitcummins.com" target="_blank"
ymailto="mailto:Abhay.Chaware@kpitcummins.com">Abhay.Chaware@kpitcummins.com</a>><o:p></o:p></span></font></p>
<div>
<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><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Wendy, </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thanks for helping me out so far. </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I have another question. What if I have
all my “RAM” objects inserted into working memory. How
should I write my rule’s “when” portion to get a collection
of all the RAM objects matching type “DDR” ? In other words,
can I get collection of facts assigned to a variable and use it in the
“then” part ?</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thanks</span></font><o:p></o:p></p>
<div>
<div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Abhay</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>==================================</span></font><o:p></o:p></p>
<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'> <a
href="mailto:rules-users-bounces@lists.jboss.org" target="_blank"
ymailto="mailto:rules-users-bounces@lists.jboss.org">rules-users-bounces@lists.jboss.org</a>
[mailto:<a href="mailto:rules-users-bounces@lists.jboss.org" target="_blank"
ymailto="mailto:rules-users-bounces@lists.jboss.org">rules-users-bounces@lists.jboss.org</a>]
<b><span style='font-weight:bold'>On Behalf Of </span></b>Wendy Mungovan<br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, May 06, 2011 5:47 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] Basic
rules question</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 color=black face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:black'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 color=black face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:black'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 color=black face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:black'>Q2:<br>
So the rule would be something like:<br>
<br>
rule "RAM type"<br>
when<br>
$product: Product(type == "laptop");<br>
then<br>
//you are looking for the best way to set valid RAM
types in the then part of the rule?<br>
$product.setRamType("DDR");<br>
//or<br>
$product.setValidRamOptions( getValidRamOptions("DDR"));<br>
end<br>
<br>
where getValidRamOptions would be a custom function included through 'import
function' so you can then load the choices from some where else. Or if
RamOptions were an object in memory you could have a rule like:<br>
<br>
rule "RAM type"<br>
when<br>
$product: Product(type == "laptop");<br>
$ramOptions: RAMOptions(type == "DDR");<br>
<br>
then<br>
$product.setValidRamOptions( $ramOptions.getList());<br>
end<br>
<br>
<br>
<br>
<br>
Wendy</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 color=black face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:black'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>==================================</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font><o:p></o:p></p>
<div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Regards,</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
11.0pt;font-family:Arial;color:navy'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Abhay Chaware</span></font><o:p></o:p></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 | <a
href="mailto:abhay.chaware@kpitcummins.com" target="_blank"
ymailto="mailto:abhay.chaware@kpitcummins.com">abhay.chaware@kpitcummins.com</a>
|<a href="http://www.kpitcummins.com" target="_blank">www.kpitcummins.com</a> </span></font><o:p></o:p></p>
<p class=MsoNormal><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>
</div>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center>
</span></font></div>
<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'> <a
href="mailto:rules-users-bounces@lists.jboss.org" target="_blank"
ymailto="mailto:rules-users-bounces@lists.jboss.org">rules-users-bounces@lists.jboss.org</a>
[mailto:<a href="mailto:rules-users-bounces@lists.jboss.org" target="_blank"
ymailto="mailto:rules-users-bounces@lists.jboss.org">rules-users-bounces@lists.jboss.org</a>]
<b><span style='font-weight:bold'>On Behalf Of </span></b>Wendy Mungovan<br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, May 06, 2011 5:47 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] Basic
rules question</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>
<div>
<p class=MsoNormal><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial'>Abhay,<br>
Q1: I think that this will depend on how many different products
you have. If there is a small number it is more straight forward to have
a rule for each one (so the 2nd option). This allows all you logic to be in
one place. If there are a large number of products and writing a rule for
each one is intractable you probably would want to look into some
generalizations of the rules. Is that helpful?<br>
<br>
Q2: I'm not quite sure what you are getting at in Q2. Are you
trying to write validation rules or rules that are modifying the facts?</span></font><o:p></o:p></p>
<div>
<p class=MsoNormal><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial'> </span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3 face=Arial><span
style='font-size:12.0pt;font-family:Arial'>Wendy</span></font><o:p></o:p></p>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
<hr size=1 width="100%" align=center>
</span></font></div>
<p class=MsoNormal style='margin-bottom:12.0pt'><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'> Abhay B.
Chaware <<a href="mailto:Abhay.Chaware@kpitcummins.com" target="_blank"
ymailto="mailto:Abhay.Chaware@kpitcummins.com">Abhay.Chaware@kpitcummins.com</a>><br>
<b><span style='font-weight:bold'>To:</span></b> "<a
href="mailto:rules-users@lists.jboss.org" target="_blank"
ymailto="mailto:rules-users@lists.jboss.org">rules-users@lists.jboss.org</a>"
<<a href="mailto:rules-users@lists.jboss.org" target="_blank"
ymailto="mailto:rules-users@lists.jboss.org">rules-users@lists.jboss.org</a>><br>
<b><span style='font-weight:bold'>Sent:</span></b> Fri, May 6, 2011 4:59:46 AM<br>
<b><span style='font-weight:bold'>Subject:</span></b> [rules-users] Basic rules
question</span></font><o:p></o:p></p>
<div>
<p class=MsoNormal><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><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I am a newbie to rule based applications and trying to get
the concept of rules. I have couple of questions about rules to start with, not
specifically about Drools though.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Q1 - Should rules be data/model specific or can/should they
be generic or both</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>==========================================================</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>e.g. </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>If selected product “TYPE” is
“laptop”, then category “RAM” should have all
“DDR” type items compatible ( selecting items matching certain
property )</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>OR</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>If selected product is “IBM T42”, then category
“RAM” should have “512MB DDR” , “1024MB
DDR”, “2048MB DDR” compatible. ( assigning individual
items in rules )</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>OR</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Combination of both</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Q2 – How should be the data modeled in above case</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>==========================================================</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>e.g. </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>in product master, each item ( e.g. T40, T42 ) should have a
“TYPE” ( e.g. desktop or laptop ) , all items in category
“RAM” should have a “TYPE” ( e.g. DDR ) and then
control the assignment of RAM options to the PRODUCT through Rule using
“DDR” type ?</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>OR</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>in product master, each item ( e.g. T40, T42 ) should have a
“TYPE” ( e.g. desktop or laptop ) , all items in category
“RAM” should have a “compatibleProduct” column (
e.g. desktop or laptop ) and control the assignment of RAM to PRODUCT through
“dynamic” rules by selecting all the RAMs by passing the
“TYPE” of the product to the database handler.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Am I making my point clear ?</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thanks</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Abhay</span></font><o:p></o:p></p>
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