[rules-users] Declaring events separately from rules breaks expires

[Samuli Saarinen]

On 1.11.2010 9:07, Wolfgang Laun wrote:
> On 1 November 2010 07:45, Samuli Saarinen<samuli.saarinen at remion.com>  wrote:
>> On 29.10.2010 19:18, Wolfgang Laun wrote:
>>> If it were  possible to enhance the very same class with different
>>> metadata such
>>> as @expires, I'd open a JIRA and call it a bug.
>>
>> Should declaring the same event multiple times throw an exception then
>> if it's not allowed?
>>
>> I don't know if it makes sense to override other metadata but I think
>> with expires it could be possible to use the greater value of two
>> different declarations as the engine already uses multiple sources for
>> calculating the actual expires (explicit vs. implicit).
>>
>
> I'm very much against any ad-hoc rules that would silently cover a
> situation that might be an error due to oversight. Expiry is currently
> a static property of an Event type and I see absolutely no benefit in
> having multiple definitions. And why maximum? Why not minimum? Or
> average ;-)
> -W

 From drools fusion UG [1]
"The engine will make this analysis for the whole rulebase and find the 
offset for every event type. Whenever an implicit expiration offset 
clashes with the explicit expiration offset, then engine will use the 
greater of the two."

Can you tell me why maximum is chosen here and not an average?

But I get your point it would not be beneficial to have the kind of 
functionality I was hoping for. But I still suggest that the engine 
would report the error if event declaration is done more than once as it 
is currently possible although the first only counts afaik.

As you can prolly see from the amount of questions I have recently 
posted I'm just trying to figure out the way drools works and to add my 
few cents to hopefully make it a better project :).

Cheers,
Samuli


[1] 
http://downloads.jboss.com/drools/docs/5.1.1.34858.FINAL/drools-fusion/html_single/index.html#d0e1300

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