[rules-dev] is there a way to get "declare"s out of the working memory?

[Michael Neale]

Can you put the query in the same file as the declare? I want to
narrow it down to if it is a scope issue with the builder.


Michael.

On Sun, Oct 18, 2009 at 11:55 AM, Michael Neale <michael.neale at gmail.com> wrote:
> So the fact referred in the query is a declared fact type which is in
> another DRL?
> Queries are the same as rules underneath, just with no traditional RHS
> - so it should work if it can see the declared type. You can check
> that by changing it to a rule, and having the RHS add the results to a
> global list (that is a common pattern for returning results as well).
>
> On Sun, Oct 18, 2009 at 7:49 AM, Michael Neale <michael.neale at gmail.com> wrote:
>> Yes there is a FactType class which represents the class (like a dynabean)
>> and it has helper method to get at values etc.
>>
>> Sent from my phone.
>>
>> On 17/10/2009, at 9:28 AM, leif hanack <leif.hanack at hypoport.de> wrote:
>>
>>> Hi,
>>> since Drools 5 it is possible to define a dynamic variable holder by
>>> using the declare notation. This feature is really cool.
>>> I can create easily helper rules, that calculate temporary values:
>>>
>>> File: calculate_total_amount.drl
>>>
>>> declare TotalAmount
>>>  amount : Money
>>> end
>>>
>>> rule "calculate total amount"
>>>  when
>>>   ..
>>>  then
>>>   TotalAmount totalAmount = new TotalAmount();
>>>   totalAmount.setAmount($calculatedAmount);
>>>   insert(totalAmount);
>>> end
>>>
>>> Inside another file I use this helper.
>>>
>>> File: another_rule.drl
>>>
>>> rule "another rule"
>>>  when
>>>   TotalAmount( amount > 1000)
>>>  then
>>>    // do s.th.
>>> end
>>>
>>> I unit test my rule by querying a fact and verify my assertions. This
>>> works fine, as long as the fact is a class of my factmodel.
>>> Now my question: Is there a way to query a declared class (in this
>>> case TotalAmount)
>>>
>>> I tried it with some variations but without success:
>>>
>>> import my.package.of.the.rule;
>>> query "get total amount"
>>>  amount : TotalAmount()
>>> end
>>>
>>> I thought that a declare is compiled to a class, but I can not find it
>>> in the generated classes.
>>> Did you have any help?
>>>
>>> An alternative might be to create a holder class. S.th. like that
>>>
>>> rule "calculate total amount"
>>>  ..
>>>  then
>>>   TotalAmount totalAmount = new TotalAmount();
>>>   totalAmount.setAmount($calculatedAmount);
>>>   insert(totalAmount);
>>>   Holder holder = new Holder();
>>>   holder.setObject(totalAmount);
>>>   insert(holder);
>>> end
>>>
>>>
>>> import my.package.holder;
>>> query "get holder"
>>>  holder : Holder()
>>> end
>>>
>>> Thanks in advance, Leif
>>> _______________________________________________
>>> rules-dev mailing list
>>> rules-dev at lists.jboss.org
>>> https://lists.jboss.org/mailman/listinfo/rules-dev
>>
>
>
>
> --
> Michael D Neale
> home: www.michaelneale.net
> blog: michaelneale.blogspot.com
>



-- 
Michael D Neale
home: www.michaelneale.net
blog: michaelneale.blogspot.com