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

[Michael Neale]

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
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>



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