[rules-users] Object insertion on runtime

[FrankVhh]

I know etiquette stipulates to avoid small talk, but since there is no
"resolved" button, I think this can be useful.

You suspected rightly, manstis, removing lock-on-active and replacing it
with extra constraints in the LHS indeed solved the problem.

Thanks for the quick (and correct) response :-).


manstis wrote:
> 
> I suspect your use of lock-on-active.
> 
> Expert's documentation states: "Whenever ... an agenda-group receives the
> focus, any rule within that group that has lock-on-active set to true will
> not be activated any more; irrespective of the origin of the update, the
> activation of a matching rule is discarded". Both rules are in the default
> MAIN agenda group so when the first inserts a new Price the update to WM
> (insert in your case) is not visible to the other rule. Inserting a new
> Price before calling fireAllRules or commenting out the price constraint
> in
> the LHS alters the Facts\Patterns needing to be matched for activation to
> occur.
> 
> So, try removing lock-on-active (or making the two rules in different
> agenda
> groups).
> 
> With kind regards,
> 
> Mike
> 
> On 8 March 2011 09:53, FrankVhh  wrote:
> 
>> Hi all,
>>
>> Since yesterday, I am having a problem with reading inserted objects from
>> memory. I don't know why it does not go as planned, because it should be
>> quite straightforward. It is getting boring to stare at the code, so
>> maybe
>> one of you can detect an error.
>>
>> There are 2 kinds of rules. One kind inserts price objects into working
>> memory (as in example 1). THe other kind detects whether the price exists
>> and adapts it to a product (as in example 2).
>>
>> Example 1 seems to work, but the engine does not seem to recognize them
>> as
>> a
>> Price object. All original price attributes of the products remain
>> unchanged
>> unless:
>>   - I manually insert a Prce object before calling fireAllRules()
>>   or
>>   - Checking for an existing price is commented out in the LHS
>>
>> Removing constraints from $price (just checking for existance of a price)
>> does not help.
>>
>> Any idea what has been going wrong?
>>
>> Thanks in advance.
>>
>> ==============Example 1=================
>> rule "Prices_17"
>>
>>        lock-on-active true
>>        when
>>        then
>>                Price $price = new Price();
>>                $price.setName("Blue autumn");
>>                $price.setPrice(6);
>>                insert($price);
>>                System.out.println("Price " + $price.getName() + "
>> inserted");
>> end
>> =============Example of usage=========================
>>
>> rule "Products_36"
>>
>>        lock-on-active true
>>        when
>>                $product: Product(colour == "Blue")
>>                Season(season == Season.AUTUMN)
>>                $price: Price(name == "Blue autumn")
>>        then
>>                $product.setPrice($price.getPrice());
>>                update($product);
>>                System.out.println("Rule executed");
>> end
>> ===================================================
>>
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> 
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