[rules-users] Drools get value from stateful session

[Wolfgang Laun]

What about FactType.getFactClass()? Should avoid all issues.
Admittedly, in order to get the FactType, you'll have to start with a
package name and the declared type name as strings, but these ought to
be identlical to what you have in your DRL. But the Class is the
Class.

But I think OP's problem is solved...

Cheers
-W


On 10/11/2013, Stephen Masters <stephen.masters at me.com> wrote:
> That’s what I meant … if a Java fact is being used, then using .getClass()
> is a better approach than strings.
>
> I wrote the method to support DRL declared types originally. If I create a
> declared type, then I know that the simple name will match the name of my
> declared type once Drools has converted it internally into a Java class.
> However, I can’t reference the class directly at Java compile time, so a
> class-based solution won’t work. Additionally, I don’t like to assume that
> the full class name with packages, that Drools will generate will remain the
> same across different versions. Whereas I do know that within my code, I
> won’t be creating 2 facts with the same simple name.
>
> Admittedly these days, I tend to avoid using declared types that are
> expected to exist outside of working memory, so there’s not much reason for
> me to use this String-based finder any more. In fact I wrote a new method
> earlier today, with a Class argument, as it is a better idea for most of my
> uses these days. :)
>
>
>
> On 10 Nov 2013, at 15:06, Wolfgang Laun <wolfgang.laun at gmail.com> wrote:
>
>> I just see that I forgot to add "equals":
>>    return object.getClass().equals( factClass );
>>
>> @Stephen: I don't understand "if a Java fact is being used". Sure, the
>> object filter's accept takes an object, so object.getClass() is the
>> typical way to go. But why the detour into strings?
>> ....StudentBean.class isn't much longer than the class name as a
>> string ;-)
>>
>> -W
>>
>> On 10/11/2013, Stephen Masters <stephen.masters at me.com> wrote:
>>> Good point Wolfgang … it’s a bit of my code that I provided. I tend to
>>> use
>>> SimpleName to make it easy to find declared types as well as Java
>>> classes.
>>> But if a Java fact is being used, then getClass() is a much better idea.
>>>
>>>
>>> On 10 Nov 2013, at 07:27, Wolfgang Laun <wolfgang.laun at gmail.com> wrote:
>>>
>>>> Digging a bit into Java's API always helps ;-) Note that
>>>> Class.getSimpleName() really does what it says, as opposed to
>>>> Class.getName().
>>>>
>>>> It would be best to avoid the String representation:
>>>>
>>>> Collection findFacts( StatefulKnowledgeSession session, Class factClass
>>>> ){...
>>>> public boolean accept( Object object ){
>>>>  return object.getClass().( factClass );
>>>> }...}
>>>>
>>>> -W
>>>>
>>>> On 10/11/2013, forsakendoll <forsakendoll at hotmail.com> wrote:
>>>>> How can I get the value from a stateful session. As they say I can use
>>>>> this:
>>>>>
>>>>> protected Collection findFacts( final StatefulKnowledgeSession
>>>>> session,
>>>>> final String factClass )
>>>>> {
>>>>>       ObjectFilter filter = new ObjectFilter()
>>>>>       {
>>>>>           @Override
>>>>>           public boolean accept( Object object )
>>>>>           {
>>>>>               return object.getClass().getSimpleName().equals(
>>>>> factClass
>>>>> );
>>>>>           }
>>>>>       };
>>>>>
>>>>>       Collection results = session.getObjects( filter );
>>>>>
>>>>>       return results;
>>>>> }
>>>>>
>>>>> to get the value from the rules. Given the fact the code already red
>>>>> the
>>>>> rules when I  tried this:
>>>>>
>>>>> StatefulKnowledgeSession ksession =
>>>>> aKnowledgeBase.newStatefulKnowledgeSession();
>>>>>
>>>>> ksession.insert( aBean );
>>>>> ksession.fireAllRules();
>>>>>
>>>>> Collection result = findFacts( ksession,
>>>>> "com.neu.als.thesis.db.beans.StudentBean" );
>>>>>
>>>>> ksession.dispose();
>>>>> for( Object test : result )
>>>>> {
>>>>>     System.out.println( test == null );
>>>>>     System.out.println( test );
>>>>> }
>>>>>
>>>>> Nothing is printed. What is the proper way to get bean that I inserted
>>>>> in
>>>>> the rules?
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> View this message in context:
>>>>> http://drools.46999.n3.nabble.com/Drools-get-value-from-stateful-session-tp4026712.html
>>>>> Sent from the Drools: User forum mailing list archive at Nabble.com.
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