[rules-users] From RuleAgent to KnowledgeAgent

[Esteban Aliverti]

The runtime type of the objects returned by KnowledgePackageImp.getRules()
is org.drools.definitions.rule.impl.RuleImpl. RuleImpl implements
org.drools.definition.rule.Rule and contains a org.drools.rule.Rule as
attribute. The thing is that it is not exposing all the org.drools.rule.Rule's
attributes. I really don't know why these two different Rule classes exists.
It would be nice if someone could clarify this.
As a workaround you can cast agent.getKnowledgeBase().getKnowledgePackage(
/* ... */ ) to KnowledgePackageImpl and use its public attribute pkg to get
the rules you want. Remember that this is just a workaround. It would be
better to use the standard APIs.

2010/4/13 Luiz Eduardo Guida Valmont <legvalmont at gmail.com>

> a less critical part of that code
>>
>
> I meant a part of the application I'm working on, not the one that'll
> generate the DRL files.
>
> Mea culpa
>
>
> On 13 April 2010 17:30, Luiz Eduardo Guida Valmont <legvalmont at gmail.com>wrote:
>
>> Hi all,
>>
>> Recently I had to update part of the application I'm working so it would
>> use KnowledgeAgent instead of RuleAgent. The later restricts scanned DRL
>> files so that all rules from any given package must be written into only one
>> file), whereas the former does not. Long story made short: an external
>> application will feed my application with generated DRL's and it cannot (aka
>> will not) managed a single monolithic DRL or even regenerate it every now
>> and then.
>>
>> What happens is that I have to update (re-write?) a less critical part of
>> that code which generates a list of all rules contained within a certain
>> package. It has to print rules' attibutes like name, salience,
>> date-effective and date-expires. On the one hand, the old code imports *
>> org.drools.rule.Rule* (1), which provides getters for such properties;
>> that Rule class is accessed through a chain of method calls starting at
>> RuleAgent, for example:
>>
>> agent.getRuleBase().getPackage( /* ... */ ).getRules()[ /* ... */
>>> ].getDateEffective()
>>>
>>
>> On the other hand, when using KnowledgeAgent's, I can fetch instances of
>> *org.drools.definition.rule.Rule* through a
>> similar-but-effectivelly-different chain of method calls, like so:
>>
>> agent.getKnowledgeBase().getKnowledgePackage( /* ... */ ).getRules()
>>>
>>
>> This one getRules returns a *Collection* of *
>> org.drools.definition.rule.Rule* (2). Finally, this class does not
>> provide similar methods:
>>
>> String getPackageName
>>
>> String getName
>>
>> Collection listMetaAttributes
>>
>> String getMetaAttribute
>>>
>>
>> Hoping I've made myself clear up to this point, I ask: is it posible to
>> convert an instance of (1) into an instance of (2) or is it possible to get
>> instances of (1) through getters starting at KnowledgeAgent?
>>
>> Thanks in advance,
>> Luiz Valmont
>>
>
>
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>


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Esteban Aliverti
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