Re: Slow performance

Thanks Martin !

Removing the derived did the trick.

With regards to this particular traversal , Im just in the beginning of 
creating a workbench ( see attached image). Im creating a generic 
mechanis for defining perspectives+navigationSteps and this perspective 
is the naive one. More perspectives are to follow and Ill have look at 
MDR views and principles later on. Certainly  pure reflective, MOF, 
UML15 and UML2 perspectives are needed. Right now Im focusing to get the 
framework going.

The perspectives with their navigationSteps may be dynamically 
registered and when dsiplaying an object, a lookup is performed and the 
perspectives that canHandle(Object target) are displayed in the topleft 
navigator.

Kind regards
/anders
Martin Matula wrote:

> Hi Anders,
> I think the reason why the operation is so slow is because of the 
> DependsOn association defined in MOF. It is defined so that it should 
> return all the objects that a given object depends on (by any kind of 
> other relationships/associations) transitively. This basically means 
> that every object is in "DependsOn" relationship with any other 
> object. I am not sure about the usefulness of this association in MOF 
> but it is there and we have to implement it. Anyway, when you are 
> doing this kind of iteration, you should rather restrict the iteration 
> only to non-derived associations - those carry all the original 
> information. DependsOn is just a derived association (it is computed 
> when you access it from the other associations). To do this, you 
> should modify your code in a following way:
> > for all in outermost.refAllPackages -> pkg
> >  for all in pkg.refAllAssociations ->  as
>       if (!((Association) as.refMetaObject()).isDerived())
> >         for all in as.refAllLinks
>               ...
>
> Btw., why are you doing this kind of iterations for the JTree you want 
> to construct? If you know you are operating on the MOF metamodel 
> (reading information about UML metamodel), you can build the tree 
> based on containment hierarchy (as we did it for MOF extents in MDR 
> explorer).
> If you want to build a generic browser, you may want to show separate 
> node for each association and fetch the data from MDR only when the 
> association node is expanded. Also you may consider exploring the 
> metamodel and show all the references of a class under each object 
> node and make navigation from a given object to the related objects 
> possible (as we did it in the "reflective" view in MDR Explorer).
> Or do I misunderstand your goal?
> Regards,
> Martin
> ---
>
> Anders W. Tell wrote:
>
>> Hi,
>>
>> Im creating a UI for viewing MDR /JMI artifacts for the UML 15. 
>> metamodel. When doing the following traversal MDR takes for ever to 
>> complete.
>>
>> for all in outermost.refAllPackages -> pkg
>>  for all in pkg.refAllAssociations ->  as
>>     for all in as.refAllLinks
>>        --- here it loops calling ModelElementImpl.recursiveFindDeps,  
>> ---
>>
>> Basically I want to form a JTree with the artifacts in UML 15 
>> metamodel. Im using the memory database not BTREE for fast performance.
>>
>> Is this a common problem or is a problem with the loop or ....
>>
>> cheers
>> /anders
>>
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