[Nepomuk] The Nepomuk Situation

[Albert Astals Cid]

El Dilluns, 7 de maig de 2012, a les 11:48:00, Vishesh Handa va escriure:
> On Mon, May 7, 2012 at 5:03 AM, Albert Astals Cid <aacid at kde.org> wrote:
> > El Dijous, 3 de maig de 2012, a les 00:32:37, Vishesh Handa va escriure:
> > > Hey everyone!
> > > 
> > > snip
> > > 
> > > The second solution is -
> > > * nepomuk-core installs the headers in nepomuk2
> > > * the library already has a different name, so there are no clashes over
> > > there
> > > * kde-runtime/nepomuk is removed
> > > * nepomuk-core is added as a dependency of kde-runtime
> > > 
> > > The problem with the second solution is that all applications using
> > 
> > Nepomuk
> > 
> > > will also need to depend on nepomuk-core. So far the list includes -
> > > Dolphin, KDE-pim and Telepathy (kinda)
> > 
> > Why is this needed? Can't they continue using the old APIs?
> 
> Short answer: No
> 
> Long Answer:
> 
> The original Nepomuk APIs that are present in kdelibs are synchronous. They
> basically provide a glorified cache over the Nepomuk data which is stored
> in virtuoso. Applications which push large amounts of information into
> Nepomuk (Feeders) do not need to know anything about the data already
> present in Nepomuk, they just need to push large quantities of data as fast
> as they can.
> 
> Using the synchronous kdelibs APIs makes this very hard. Additionally, the
> asynchronous API for pushing data provides has in-built duplicate detection
> and merging. That's something that was *very hard* to implement. It seems
> like an overkill for the clients to implement something like that on their
> own.
> 
> kde-pim and Telepathy use these new asynchronous APIs. So does Trueg's TV
> Naming Application.
> 
> Secondly, the APIs in kdelibs did not provide any mechanism for monitoring
> changes in resources. We've now finally implemented a good method of
> monitoring changes that does not tax the entire system. Dolphin uses this
> new ResourceWatcher API to monitor for changes in tags and ratings.
> 
> And finally, the new APIs provide a method for properly merging resources.
> A couple of miscellaneous applications are using this - Nepomuk Tag manager.
> 
> Btw, when I say "new APIs", I mean introduced in kde-runtime 4.7. So they
> are about a year old.

So you mean yes, they can, they do now and can still do it, even if using the 
"old" APIs are suboptimal.

Right?

Albert

> 
> > Cheers,
> > 
> >  Albert
> >  
> > > What do you guys think?
> > > 
> > > [1] https://projects.kde.org/projects/kde/kdelibs/nepomuk-core
> > > [2]
> > 
> > http://trueg.wordpress.com/2011/06/08/nepomuk-2-0-and-the-data-management-
> > se> 
> > > rvice/