[rules-users] LHS Dao Calls / Accessing Diff instances of same class in drl files
Sanjay Singh - s0singh
Sanjay.Singh at wal-mart.com
Fri Apr 6 11:21:45 EDT 2007
Hello everybody,
I still have 2 of my questions pending and i would really appreciate if
somebody could get back to me and help me out.
1.Calling dao in LHS when the method calls does not return collection
and returns lets say a boolean .. Code is attached below for a quick
look.
rule "Item should have a valid status"
when
ItemVo( statusCode : itemStatusCode != null)
ItemVo( statusCode == true ) from
itemValidationDao.isValidItemStatus(statusCode)
then
System.out.println("Item Status Code is valid");
end
Caused by: org.drools.rule.InvalidRulePackage: unknown:32:28 Unexpected
token 'itemValidationDao'
isValidItemStatus () method returns a boolean and i need to check if
thats true than go to the RHS side .... somehow it does not recognize
itemValidationDao in LHS side .. RHS same call works .. Can anybody
suggest how to call database in LHS ..
2.If I have a method with the signature
public ValidationErrorMap validateItemOrdEffDateMaintain(ItemVo oldItem,
ItemVo newItem, ValidationErrorMap errors, UserVo user){ }
Is there a way that i can assert two objects of same type in my working
memory ?? Like oldItem and newItem are same ItemVo's and they have
exactly same fields .. How do i assert two same type objects so that i
can deal with them in drl differently .. I have one ItemMaintVo which
can give me oldItem and newItem and i can only assert ItemMaintVo but
again how do i refer to two same type objects .. Here is the syntax ..
rule "Item status cannot be null"
when
oldItemMaint : ItemMaintWorkVo(oldItem : currentItem)
newItemMaint : ItemMaintWorkVo(newItem : newItem)
// I need to reach to the ItemVo (from old and new item) .. how do i do
it here ?
then
System.out.println( "Item Status Code is " + old or new item .
getItemStatuscode() );
end
This does not seem to work .. whats the way to operate on two different
instances of same class in DRL files ...
________________________________
From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Edson Tirelli
Sent: Friday, April 06, 2007 8:53 AM
To: Rules Users List
Subject: Re: [rules-users] Checking OR condition in LHS
Sanjay,
You almost got it right. If you are using 3.1M1 or later, you can do:
item : ItemVo ( itemStatusCode == ItemVo.STATUS_ACTIVE | ==
ItemVo.STATUS_DELETE )
field connective constraints use a single "|" or "&".
[]s
Edson
2007/4/4, Sanjay Singh - s0singh <Sanjay.Singh at wal-mart.com>:
While this is working
when
item : ItemVo(itemStatusCode == ItemVo.STATUS_INACTIVE)
or
ItemVo(itemStatusCode == ItemVo.STATUS_DELETE)
Is this the right way of doing it ?
thanks
-----Original Message-----
From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Sanjay
Singh -
s0singh
Sent: Wednesday, April 04, 2007 2:12 PM
To: Rules Users List
Subject: [rules-users] Checking OR condition in LHS
when
item : ItemVo ( itemStatusCode == ItemVo.STATUS_ACTIVE
||
ItemVo.STATUS_DELETE )
when
item : ItemVo ( itemStatusCode == ItemVo.STATUS_ACTIVE
||
itemStatusCode == ItemVo.STATUS_DELETE )
when
item : ItemVo ( (itemStatusCode == ItemVo.STATUS_ACTIVE
||
itemStatusCode == ItemVo.STATUS_DELETE) )
when
item : ItemVo ( itemStatusCode == ItemVo.STATUS_ACTIVE
|| ==
ItemVo.STATUS_DELETE )
when
item : ItemVo ( ( itemStatusCode == ItemVo.STATUS_ACTIVE
) || (
itemStatusCode == ItemVo.STATUS_DELETE ) )
when
item : ItemVo ( itemStatusCode == ItemVo.STATUS_ACTIVE
OR
itemStatusCode == ItemVo.STATUS_DELETE )
All of these when conditions fail for me .. Can somebody send
the syntax
for two attributes check with OR condition ..
thanks
-----Original Message-----
From: rules-users-bounces at lists.jboss.org
[mailto: rules-users-bounces at lists.jboss.org
<mailto:rules-users-bounces at lists.jboss.org> ] On Behalf Of Sanjay Singh
-
s0singh
Sent: Wednesday, April 04, 2007 8:13 AM
To: Rules Users List
Subject: RE: [rules-users] NullPointer in LHS dao calls ..
Thanks Rahul
Yes i was setting it in working memory thats why it was working
in RHS
.....
workingMemory.setGlobal("itemValidationDao", itemValidationDao);
and then in the DRL
global com.walmart.itemfile.item.dao.ItemValidationDao
itemValidationDao;
I think i am missing something very basic ..
thanks
-----Original Message-----
From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Rahul
Phadnis
Sent: Tuesday, April 03, 2007 5:42 PM
To: Rules Users List
Subject: Re: [rules-users] NullPointer in LHS dao calls ..
Did you set the global in the WorkingMemory?
You can do that using the API at
http://labs.jboss.com/file-access/default/members/jbossrules/freezone/do
cs/3.0.5/apidocs/index.html
and yes that is for 3.0.5. I am sure there is an
equivalent for the version that you are using.
-Rahul
--- Sanjay Singh - s0singh < Sanjay.Singh at wal-mart.com
<mailto:Sanjay.Singh at wal-mart.com> >
wrote:
> Since i could not get the earlier code running i
> tried using eval in LHS
> side for Dao calls but i keep on getting
> NullPointerException ..
>
> rule "Item should have a valid status"
>
> when
>
> ItemVo (statusCode : itemStatusCode != null)
>
> eval(
> !itemValidationDao.isValidItemStatus(statusCode) )
>
> then
>
>
errors.addValidationError("invalidtemStatusCode","Item
> Status Code is
> invalid ");
>
> end
>
> Exception data: org.drools.RuntimeDroolsException :
> java.lang.NullPointerException
>
> at org.drools.rule.EvalCondition.isAllowed(Unknown
> Source)
>
> at
>
org.drools.reteoo.EvalConditionNode.assertTuple(Unknown
> Source)
>
> at
>
org.drools.reteoo.LeftInputAdapterNode.createAndAssertTuple(Unknown
> Source)
>
> at
>
org.drools.reteoo.LeftInputAdapterNode.assertObject(Unknown
> Source)
>
> at
>
org.drools.reteoo.ObjectSource.propagateAssertObject(Unknown
> Source)
>
> Can somebody please help .. thanks
>
> ________________________________
>
> From: Sanjay Singh - s0singh
> Sent: Tuesday, April 03, 2007 11:01 AM
> To: 'Anstis, Michael (M.)'; Rules Users List
> Subject: RE: Hi.
>
>
>
> Thanks for getting back to me Mike and Edson and
> Sorry for the delayed
> response.
>
> I looked at your examples Mike and i felt better as
> you said that we can
> make dao calls in LHS .. And Edson suggested not to
> be afraid of
> suggesting the same constraint for more than one
> rule .. i guess i was
> looking at it more procedural way and dint want any
> repetition of those
> conditions as the top level IF block but looks like
> it won't hurt to
> mention these constraints in all the rules related
> to this check ...so i
> can include this check in all the rules .. hmm ..
>
> Here is a quick test i was trying to do for calling
> the dao in LHS but
> it fails .. what am i missing ..
>
> package com.walmart.itemfile.item.rules
>
> import com.walmart.itemfile.item.vo.ItemVo;
>
> import com.walmart.itemfile.item.dao.ItemDao;
>
> import
> com.walmart.itemfile.item.dao.ItemValidationDao ;
>
> import java.lang.String;
>
> global
> com.walmart.itemfile.item.dao.ItemValidationDao
> itemValidationDao;
>
> global com.walmart.itemfile.rules.ValidationErrorMap
> errors;
>
> rule "Item should have a valid status"
>
> when
>
> ItemVo( statusCode : itemStatusCode != null)
>
> ItemVo( statusCode == true ) from
> itemValidationDao.isValidItemStatus (statusCode) ..
> my isValidItemStatus
> method returns a boolean (not collection of codes)
> and i need to check
> if thats true than go to the RHS side .. is the line
> in green even right
> ... in any case it does not recognize
> itemValidationDao to begin with in
> LHS side .. RHS same call works ..
>
> then
>
> errors.addValidationError("nullItemStatusCode","Item
> Status Code is
> null");
>
> System.out.println("Item Base Defaults Called" +
> itemValidationDao.isValidItemStatus(statusCode));
>
> System.out.println("Item Status Code is null");
>
> end
>
> Caused by: org.drools.rule.InvalidRulePackage:
> unknown:32:28 Unexpected
> token 'itemValidationDao'
>
>
> thanks for the help guys ..
>
> Sanjay
>
> ________________________________
>
> From: Anstis, Michael (M.)
> [mailto:manstis1 at ford.com]
> Sent: Monday, March 26, 2007 8:57 AM
> To: Rules Users List
> Cc: Sanjay Singh - s0singh
> Subject: RE: Hi.
>
>
> Hi Sanjay,
>
> To firstly answer your questions (in my opinion):
> 1. You can't do nested whens in the LHS but you can
> do nested if / else
> in the RHS (although you'd fore go the benefits of a
> RETE-based
> inference engine; but possible if you've got very
> few rules and
> facts...). I believe that there is work to have an
> "otherwise" statement
> for rule syntax, how progressed this is and how it
> will work I don't
> know - over to Mark and team?!?
> 2. Yes, take a look at the "from" statement (new for
> 3.1-M1, see
>
http://wiki.jboss.org/wiki/Wiki.jsp?page=3.1M1ReleaseNotes)
> 3. Yes, take a look at rule-flow at
>
http://labs.jboss.com/portal/index.html?ctrl:cmd=render&ctrl:window=defa
>
ult.blog.PrjBlogPortletWindowDefaultBlog&project=jbossrules&from=1&link=
>
RuleFlow_%28Kris_Verlaenen%29#RuleFlow_%28Kris_Verlaenen%29
> (although I
> don't know if this is complete if 3.1-M1 - I think
> it's not). Although I
> don't think your rules really need rule-flow; you
> just need to identify
> and isolate the patterns (IF's) that would cause
> each "Do Something" to
> be ran and create a rule for each - this has the
> benefit of separating
> each action into a separate rule making maintenance
> a whole bunch
> easier).
>
> Anyway, I'd try some rules like the following
> examples (the rest are
> based upon these):-
>
> Rule "Rule 1"
> when
> NewItem ( itemStatusCode == null)
> then
> //do something
> end
>
> Rule "Rule 2"
> when
> $u : User( )
> $ni : NewItem ( $isc : itemStatusCode != null )
> not Codes ( codes contains $isc ) from
> valDao.getValidItemStatusCodesForUser($u)
> then
> //Do something
> end
>
> Rule "Rule 3"
> when
>
=== message truncated ===>
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> rules-users mailing list
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> https://lists.jboss.org/mailman/listinfo/rules-users
>
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and intended solely for the individual or entity to whom they
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****************************
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--
Edson Tirelli
Software Engineer - JBoss Rules Core Developer
Office: +55 11 3124-6000
Mobile: +55 11 9218-4151
JBoss, a division of Red Hat @ www.jboss.com
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