SQL? Really? Wow.
On Thu, Jun 27, 2013 at 5:26 AM, Georg Zotti <[email protected]>wrote:
> Hi Marios,
>
> I see two immediate applications: interactive debugging, and, if it's also
> possible to change values, the basic tool for building a remote control
> application.
>
> What is the effect on runtime, is there any slowdown? Is PicoQL under GPL?
> Still under development or stable?
>
> A remote-control/debug application should have a GUI/command-line
> interface on a second screen, and if possible display the relevant data
> structures without the user having to know the exact names, or these names
> must be well-documented, so a debug system should be usable for the
> developers with enough documentation for non SQL experts.
> A remote application should be as complete as possible, not just in demo
> state. It could even provide a mode to export ephemeris data, which some
> users continue to request, but which is something Stellarium was not
> developed for. But such a RC application sounds like lots of work - are
> you willing and will you have time to maintain and further develop this
> tool after demonstrating that it works?
>
> What about code maintenance: It must be documented what has to be done if
> Stellarium changes internally.
>
> I would welcome such a thing if well-made and user-friendly, how about the
> others? Or is a similar plugin under development already? Of course, it
> should be a branch on Bazaar.
>
> Georg
>
>
> On Fr, 21.06.2013, 17:01, Marios Fragkoulis wrote:
> > Dear list members,
> >
> > I am a PhD candidate and in the course of my research
> > I have developed an open-source tool [1] that allows you to instrument
> > existing
> > C/C++ programs so that you can run SQL queries on their in-memory data
> > structures.
> > All that's needed is adding a few lines of code, and linking with our
> > PicoQL library.
> > I have already instrumented successfully Stellarium, two other
> > mid-range C++ applications,
> > HDF and FITS containers (scientific computing data formats) as well as
> > the Linux kernel.
> > SQL queries are issued interactively from an external interface and
> > are type safe. They
> > are useful in extracting knowledge out of the application's data
> > structures and
> > (cross-)checking system invariants using data structure state.
> > For example, it is easy to instrument Stellarium's hierarchy of
> > services and modules
> > and combine them in queries such as the fairly trivial:
> >
> > SELECT * FROM Constellation; // Get all constellations from
> > vector<Constellation *>
> > SELECT * FROM Planet JOIN SatellitePlanet ON SatellitePlanet.base =
> > Planet.Satellites_id; // For each
> > planet in QList<PlanetP> get its satellites from
> > QList<QSharedPointer<Planet> >
> >
> > The whole Stellarium class hierarchy can be instrumented like this.
> > More information on the mapping and more queries are available here [2].
> >
> > From your experience in developing Stellarium can you see specific
> > uses of this work that would be
> > valuable to the development team and/or the user community?
> > One thought is to be able to track all stellar objects or those of a
> > specific type, say planets,
> > projected on screen (in viewport) at a certain time.
> > I have provided support for this (without any side-effects I hope) [3].
> >
> > [1] https://github.com/mfragkoulis/PiCO_QL
> > [2]
> https://github.com/mfragkoulis/PiCO_QL/tree/master/examples/Stellarium
> > [3]
> >
> https://github.com/mfragkoulis/PiCO_QL/blob/master/examples/Stellarium/stellarium_dsl.sql#L57
> >
> > Regards,
> >
> > Marios Fragkoulis
> > PhD candidate
> > Software Engineering and Security Lab
> > Department of Management Science and Technology
> > Athens University of Economics and Business
> > http://istlab.dmst.aueb.gr/content/members/m_mfrag.html
> >
> >
> >
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>
>
> --
> Dipl.-Ing. Dr Georg Zotti
> Ludwig Boltzmann Institute for
> Archaeological Prospection and Virtual Archaeology (LBI ArchPro)
> Hohe Warte 38
> A-1190 Wien
>
>
>
>
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