[rules-users] Retrieving Enumerated List from Drools

[Wolfgang Laun]

On 5 July 2011 11:09, lansyj <lansyjp at gmail.com> wrote:

> Hi,
>
> Sorry for the minimal information.
>
> We have a B2C application which is basically into eCommerce. You can
> consider it another amazon or ebay.
>
> And one thing we do today in a very crude way is personalize the appearance
> and content (ie., products, pricing of products, banner images, etc) based
> on the user profile. For example, on Valentine's day if the user is a male,
> he gets to see gifts for a female and vice versa.
>

Sounds as if my wife would like me to shop there  ;-)


>
> So, as part of a Solution revamp, we have decided to use Drools to manage
> product visibility by having a rule which says... if the user is male, dont
> show this but show that as a basic example. Now, there are certain
> functionalities we have as core in our Content Management System (like a
> custom Joomla or Drupal) which we wouldnt want to migrate entirely to
> Drools. So, we would define the segments in Drools and map such segments to
> the existing entities.
>
> eg: Segment can be Male vs Female with Segment Codes SEG_MALE and
> SEG_FEMALE
> as an example where SEG_MALE and SEG_FEMALE are two possible values in an
> enumerated list.


Could be Java enum values or just String values, I suppose.


> Now, this being the situation, we want to be able to
> retrieve this list


Let's call it Collection


> of enumerated values into our CMS so that we can map them
> to existing entities like banner images.
>

There are several ways of extracting all values of a field of the full set
of facts of a given type.

You can do it in a rule, creating a List or a Set. Or you can run a query.

There is nothing mysterious about the Working Memory of Drools. It's a bunch
of objects and rules and queries operate on them according to your fancy
programming.


>
> Hope this helps.
>

And I hope to have allayed your fears ;-)

-W


>
> Best Regards
>
> -lj
>
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