Abstract
This chapter covers DBus programming with Vala. After a brief overview about the core DBus concepts, we will show how to develop both a DBus client and a DBus server.
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Notes
- 1.
Prior to DBus support in gio, developers either used the (very low-level) freedesktop.org reference library libdbus or the (higher level) stand-alone dbus-glib binding library. Since the latter had many design problems that were exposed when DBus usage grew substantially, a rewrite was carried out in 2012. This rewrite has been called gdbus and is a part of gio since glib version 2.26.
- 2.
While this is an instructive example, note that GObject-based classes have built-in singleton support. Vala provides this via the [SingleInstance] decorator.
- 3.
Actually, even given a valid genre id, there might be a whole lot of other errors, since we’re hitting the network here. Production-ready code should do better, e.g., by inspecting the HTTP status code and throwing appropriate errors in the DirectoryClient.
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© 2019 Michael Lauer
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Lauer, M. (2019). DBus. In: Introducing Vala Programming. Apress, Berkeley, CA. https://doi.org/10.1007/978-1-4842-5380-9_7
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DOI: https://doi.org/10.1007/978-1-4842-5380-9_7
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Publisher Name: Apress, Berkeley, CA
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Online ISBN: 978-1-4842-5380-9
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