Introduce gobject introspection
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GObject Introspection provides a way for language bindings to access GObject-based libraries without needing separate bindings libraries. It uses annotations in library source code to generate metadata about APIs. When an API changes, only the library needs to be recompiled rather than each language binding. This metadata allows languages to access the libraries directly through a common C-based introspection mechanism.
Introduce gobject introspection
- 2. Typical GObject Application Development Layer GLib/GObject ATK Pango GTK+ Clutter Gstreamer Ext Libraries PyGTK Gtk# java- gnome Gtk2- Perl Ruby- Gnome2 C Apps Python Apps Mono Apps Java Apps Perl Apps Ruby Apps
- 3. If Library apis are changed... ●Library bump version ●PyGtk bump version ●gtk-sharp bump version ●java-gnome bump version ●Gtk2-Perl bump version ●Ruby-Gnome2 bump version ●듣보잡 language binding bump version
- 5. GI Enabled Development Layer GLib/GObject ATK Pango GTK+ Clutter Gstreamer Ext Libraries libffi/libgirepository C Apps Python Apps Mono Apps Java Apps Perl Apps Ruby Apps Typelib Typelib Typelib Typelib TypelibTypelib Typelib Typelib
- 6. If Library apis are changed... ●Library bump version (with TypeLib) ●don't need to change each language binding.
- 7. Overview of GI's Architecture ●http://live.gnome.org/GObjectIntrospection/Architecture ●Annotations in library source codes ogtk_window_resize() http://goo.gl/8i7dx ogtk_window_get_size() http://goo.gl/MOr8a
- 8. The Difference between GI and CLI ●TypeLib are not bytecodes but metadata. ●Each Language Host are just using each C libraries with libgirepository. ●Each Libraries are CIL bytecodes. ●Each Language Host must build/run on CLR.
- 9. Example 1 for python binding # using pygtk import gtk w = gtk.Window() w.show_all() gtk.main() # using gir import gi gi.require_version("Gtk", "2.0") from gi.repository import Gtk w = Gtk.Window() w.show_all() Gtk.main()
- 10. Example 2 for js binding (gjs, seed) imports.gi.versions.Gtk = '3.0' const Gtk = imports.gi.Gtk; Gtk.init(null, 0) w = new Gtk.Window({ type: Gtk.WindowType.TOPLEVEL }) w.show_all() Gtk.main()
- 11. Example 3 ●WebPreview ojs version http://goo.gl/W4wt3 opython version http://goo.gl/lHspm