[rules-users] LHS Dao Calls / Accessing Diff instances of same class in drl files
Edson Tirelli
tirelli at post.com
Fri Apr 6 11:45:19 EDT 2007
Sanjay
I already answered question number 1. Plz see my other e-mail.
For question number 2, try:
rule "Item status cannot be null"
when
itemMaint : ItemMaintWorkVo()
oldItem : ItemVo( <constraints>) from itemMaint.getCurrentItem()
newItem : ItemVo( <constraints> ) from itemMaint.getNewItem()
then
end
Let us know if above works. When the method called by "from" returns a
single non-Collection object, the dataprovider automatically wrapps the
result in a singleton list.
[]s
Edson
2007/4/6, Sanjay Singh - s0singh <Sanjay.Singh at wal-mart.com>:
>
> 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] 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>
> > 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 ===>
> > _______________________________________________
> > > rules-users mailing list
> > > rules-users at lists.jboss.org
> > > https://lists.jboss.org/mailman/listinfo/rules-users
> > >
> >
> >
> >
> > _______________________________________________
> > rules-users mailing list
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> > https://lists.jboss.org/mailman/listinfo/rules-users
> >
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> > addressed. If you have received this email in error destroy it
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> >
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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 are
> > addressed. If you have received this email in error destroy it
> > immediately. ******************************************************
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> > ******************************************
> >
> >
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> > rules-users mailing list
> > rules-users at lists.jboss.org
> > https://lists.jboss.org/mailman/listinfo/rules-users
> >
>
>
>
> --
> 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
>
> ------------------------------
>
>
> *
> *******************************************************************
> *** This email and any files transmitted with it are confidential
> and intended solely for the individual or entity to whom they are
> addressed. If you have received this email in error destroy it
> immediately. ******************************************************
> **************** Wal-Mart Confidential ****************************
> ******************************************
> *
>
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>
--
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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