[rules-users] change "assert" to "insert"+ other changes

[Michael Rhoden]

I have a question related to this. Is there a way within a rule that you
can add 30 days to a date...
 
//mydate within last 30 days
mydate + 30 > getdate()
then dosomething()
 
I would only want mydate modified for this rule only not re-asserted on
the stack with a new date. Also if someone could point me in the
direction of some good info on dealing with dates in rules, love to see
more examples.
 
------------------------------------------------------------------------
-----------------------
-MVEL has sugar to do: modify ( person ) { age += 1, location = "london"
}, what actually happens here is it first calls modifyRetract then
applies the setters and then calles modifyAssert.
------------------------------------------------------------------------
-----------------------
 
Thanks,
-Michael
 

 
 
 

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From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Mark Proctor
Sent: Tuesday, June 12, 2007 3:39 PM
To: Rules Dev List
Cc: Rules Users List
Subject: [rules-users] change "assert" to "insert"+ other changes


Ok, I'm now doing these changes. 


Mark Proctor wrote: 

   I've had no further feedback on this, so I'm going to make this
   change as part of the next milestone release (this week) - these
   changes are considerable.
   
   assert will change to insert
   -avoid the constant keyword collision with "assert", most languages
   are seem to support this now
   -will change in both the drl and working memory api
   
   modify to become update
   -instead of workingMemory.modify(FactHandle, Object) it will be
   workingMemory.update(FactHandle, Object), will change modify to
   update in drl.
   -this method is now only used for ShadowFact objects, it's  a method
   to let the engine know that an external object has been updated and
   to update it's internal cache. and reprocess.
   -avoid keyword collision in MVEL which has nice "modify" sugar now
   
   insertObject, retractObject and updateObject to beome insert, retract
   and update
   -the Object part seems superflous, might as well remove it,
   especially as we start to support none Object fact types
   -drl and working memory api will now use the same method names.
   
   added new WorkingMemory modifyRetract and modifyAssert methods
   -allows for non shadow fact objects.
   -When not using shadow facts (although will ofcourse work with shadow
   facts) you cannot call 'update', or what use to be called 'modify',
   because we need to know the "old" value of fields so we can retract
   the from the workign memory. The only safe way is to first retract
   the object and then assert it. However with the existing api this
   adds extra work and results in new fact handle. modifyRetract and
   modifyAssert can now be used together to "simulate" a modify on a
   none shadow fact object in two parts. First call modifyRetract, then
   change your field values, then call modifyAssert.
   -MVEL has sugar to do: modify ( person ) { age += 1, location =
   "london" }, what actually happens here is it first calls
   modifyRetract then applies the setters and then calles modifyAssert.
   
   Mark
   
   Greg Barton wrote: 

      I think it's a good idea, so ya, change to "insert"
      
      GreG
      
      --- Mark Proctor <mproctor at codehaus.org> wrote:
      
        

         We have been getting querries with regards to jdk
         assert collision and 
         jboss rules assert, for this reason we are thinking
         of changing it to 
         insert for 4.0. Further to that its causing language
         integrations issues 
         for us as we expand pluggeable dialects. For this
         reason we are thinking 
         of chaning assert to insert, this would be an api
         change and a language 
         level change. I'd thought I'd throw this out to the
         community before we 
         do it. This of course breaks backwards
         compatability.
         
         Mark
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