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| <div class="chapter"> |
| <div class="titlepage"><div><div><h2 class="title"> |
| <a name="id-1.5.5"></a>Migrating to GDBus</h2></div></div></div> |
| <div class="toc"><dl class="toc"> |
| <dt><span class="section"><a href="ch35.html#id-1.5.5.2">Conceptual differences</a></span></dt> |
| <dt><span class="section"><a href="ch35s02.html">API comparison</a></span></dt> |
| <dt><span class="section"><a href="ch35s03.html">Owning bus names</a></span></dt> |
| <dt><span class="section"><a href="ch35s04.html">Creating proxies for well-known names</a></span></dt> |
| <dt><span class="section"><a href="gdbus-example-gdbus-codegen.html">Using gdbus-codegen</a></span></dt> |
| </dl></div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h2 class="title" style="clear: both"> |
| <a name="id-1.5.5.2"></a>Conceptual differences</h2></div></div></div> |
| <p> |
| The central concepts of D-Bus are modelled in a very similar way |
| in dbus-glib and GDBus. Both have a objects representing connections, |
| proxies and method invocations. But there are some important |
| differences: |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> |
| <li class="listitem"><p> |
| dbus-glib uses the <a class="ulink" href="http://www.freedesktop.org/wiki/Software/dbus#ReferenceImplementation.28dbus-daemonandlibdbus.29" target="_top">libdbus |
| reference implementation</a>, GDBus doesn't. Instead, it |
| relies on GIO streams as transport layer, and has its own |
| implementation for the D-Bus connection setup and |
| authentication. Apart from using streams as transport, |
| avoiding libdbus also lets GDBus avoid some thorny |
| multithreading issues. |
| </p></li> |
| <li class="listitem"><p> |
| dbus-glib uses the GObject type system for method arguments and |
| return values, including a homegrown container specialization |
| mechanism. GDBus relies on the <a href="../glib-GVariant.html#GVariant"><span class="type">GVariant</span></a> type system which is |
| explicitly designed to match D-Bus types. |
| </p></li> |
| <li class="listitem"><p> |
| dbus-glib models only D-Bus interfaces and does not provide |
| any types for objects. GDBus models both D-Bus interfaces |
| (via the <a class="link" href="GDBusInterface.html" title="GDBusInterface"><span class="type">GDBusInterface</span></a>, <a class="link" href="GDBusProxy.html" title="GDBusProxy"><span class="type">GDBusProxy</span></a> and |
| <a class="link" href="GDBusInterfaceSkeleton.html" title="GDBusInterfaceSkeleton"><span class="type">GDBusInterfaceSkeleton</span></a> types) and objects (via the |
| <a class="link" href="GDBusObject.html" title="GDBusObject"><span class="type">GDBusObject</span></a>, <a class="link" href="GDBusObjectSkeleton.html" title="GDBusObjectSkeleton"><span class="type">GDBusObjectSkeleton</span></a> and <a class="link" href="GDBusObjectProxy.html" title="GDBusObjectProxy"><span class="type">GDBusObjectProxy</span></a> types). |
| </p></li> |
| <li class="listitem"><p> |
| GDBus includes native support for the <a class="ulink" href="http://dbus.freedesktop.org/doc/dbus-specification.html#standard-interfaces-properties" target="_top">org.freedesktop.DBus.Properties</a> (via the <a class="link" href="GDBusProxy.html" title="GDBusProxy"><span class="type">GDBusProxy</span></a> type) and <a class="ulink" href="http://dbus.freedesktop.org/doc/dbus-specification.html#standard-interfaces-objectmanager" target="_top">org.freedesktop.DBus.ObjectManager</a> D-Bus interfaces, dbus-glib doesn't. |
| </p></li> |
| <li class="listitem"><p> |
| The typical way to export an object in dbus-glib involves |
| generating glue code from XML introspection data using |
| <span class="command"><strong>dbus-binding-tool</strong></span>. GDBus provides a |
| similar tool called <span class="command"><strong>gdbus-codegen</strong></span> that |
| can also generate Docbook D-Bus interface documentation. |
| </p></li> |
| <li class="listitem"><p> |
| dbus-glib doesn't provide any convenience API for owning and |
| watching bus names, GDBus provides the <a class="link" href="gio-Owning-Bus-Names.html#g-bus-own-name" title="g_bus_own_name ()"><code class="function">g_bus_own_name()</code></a> and |
| <a class="link" href="gio-Watching-Bus-Names.html#g-bus-watch-name" title="g_bus_watch_name ()"><code class="function">g_bus_watch_name()</code></a> family of convenience functions. |
| </p></li> |
| <li class="listitem"><p> |
| GDBus provides API to parse, generate and work with <a class="link" href="gio-D-Bus-Introspection-Data.html" title="D-Bus Introspection Data">Introspection |
| XML</a>, dbus-glib doesn't. |
| </p></li> |
| <li class="listitem"><p> |
| GTestDBus provides API to create isolated unit tests GDBus Test Scaffolding. |
| </p></li> |
| </ul></div> |
| <p> |
| </p> |
| </div> |
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