Hello, I've a situation like the one in the example that I've attached
here, where I need to make an asynchronous call to a method from a dbus
signal callback function; to perform that I need to use the yield
modifier, and so I need the callback function method should be async.
Now, when I connect the async method to the dbus interface with
somethink like:
session_proxy = (FreeDesktopDBus) connection.get_object
(FreeDesktopDBus.UNIQUE_NAME,
FreeDesktopDBus.OBJECT_PATH,
FreeDesktopDBus.INTERFACE_NAME);
session_proxy.name_acquired.connect (this.name_acquired);
Where name_acquired is defined as:
private async void name_acquired(FreeDesktopDBus sender, string name) {
}
I get an error:
Cannot convert from `Test.name_acquired' to
`FreeDesktopDBus.name_acquired
As a workaround I added two sync signal methods to the dbus interface,
but not using async calls is not a good think here...
Other ways? Thanks!
Bye.
PS: I'm using dbus-glib since the project I'm working on, uses it and I
can't change that.
using GLib;
[DBus (name = "org.freedesktop.DBus")]
public interface FreeDesktopDBus : GLib.Object
{
public const string UNIQUE_NAME = "org.freedesktop.DBus";
public const string OBJECT_PATH = "/org/freedesktop/DBus";
public const string INTERFACE_NAME = "org.freedesktop.DBus";
public abstract async string[] list_names () throws DBus.Error;
public abstract async string[] list_activatable_names () throws DBus.Error;
public abstract async string get_id () throws DBus.Error;
public signal void name_lost (string name);
public signal void name_acquired (string name);
public signal void name_owner_changed (string name, string old_name, string new_name);
}
public class Test : GLib.Object {
private List<string> owned_names;
private List<string> activatable_names;
FreeDesktopDBus session_proxy;
public Test() {
owned_names = new List<string>();
activatable_names = new List<string>();
session_proxy = null;
}
/* FIXME vala (at least 0.12) doesn't allow to call an async method!
* until vala fixes it, add the new name to the activables one
* error is : Cannot convert from `Test.name_acquired' to
* `FreeDesktopDBus.name_acquired' */
private /*async*/ void name_acquired(FreeDesktopDBus sender, string name)
{
if (name.has_prefix (":")) return;
//if (name in yield sender.list_names ())
owned_names.append (name);
//else if (name in yield sender.list_activatable_names ())
activatable_names.append (name);
printData();
}
private void name_owner_changed (FreeDesktopDBus sender,
string name,
string old_owner,
string new_owner)
{
if (name.has_prefix (":")) return;
if (old_owner == "")
{
owned_names.append(name);
}
else if (new_owner == "")
{
owned_names.remove(name);
}
printData();
}
public async void init() {
DBus.Connection connection;
string[] names;
try
{
connection = DBus.Bus.get (DBus.BusType.SESSION);
session_proxy = (FreeDesktopDBus)
connection.get_object (FreeDesktopDBus.UNIQUE_NAME,
FreeDesktopDBus.OBJECT_PATH,
FreeDesktopDBus.INTERFACE_NAME);
session_proxy.name_owner_changed.connect (this.name_owner_changed);
session_proxy.name_acquired.connect (this.name_acquired);
session_proxy.name_lost.connect ((p, name) => {
activatable_names.remove(name);
owned_names.remove(name);
});
names = yield session_proxy.list_names ();
foreach (unowned string name in names)
{
if (name.has_prefix (":")) continue;
owned_names.append(name);
}
names = yield session_proxy.list_activatable_names ();
foreach (unowned string session_act in names)
{
activatable_names.append(session_act);
}
this.printData();
}
catch (Error err)
{
error ("%s", err.message);
}
}
private void printData()
{
if (session_proxy == null)
this.init.begin();
print("Session Names:\n");
foreach(string s in owned_names)
print(" - "+s+"\n");
print("\n");
print("Session Activatable Names:\n");
foreach(string s in activatable_names)
print(" - "+s+"\n");
print("\n");
}
}
int main(string[] args) {
var t = new Test();
t.init.begin();
var loop = new GLib.MainLoop (null, false);
loop.run();
}
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