[glib] GDBusObjectManagerServer: Allow setting :connection property
- From: David Zeuthen <davidz src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [glib] GDBusObjectManagerServer: Allow setting :connection property
- Date: Wed, 4 May 2011 07:48:13 +0000 (UTC)
commit 1ab29b6c4a2ddf5a60b4cc353422d605197b7696
Author: David Zeuthen <davidz redhat com>
Date: Wed May 4 03:37:46 2011 -0400
GDBusObjectManagerServer: Allow setting :connection property
.. and add a C setter to do this. Also make the C getter return a
reference since the property may be set from another thread. Also
change the constructor to _not_ take a GDBusConnection since this is
something you almost always want to do _after_ creating it. The
API/ABI break is fine as there has never been a GLib release with this
type.
https://bugzilla.gnome.org/show_bug.cgi?id=648959
Signed-off-by: David Zeuthen <davidz redhat com>
docs/reference/gio/gio-sections.txt | 1 +
gio/gdbusobjectmanagerserver.c | 266 +++++++++++++++++-------
gio/gdbusobjectmanagerserver.h | 5 +-
gio/gio.symbols | 1 +
gio/tests/gdbus-example-objectmanager-server.c | 5 +-
gio/tests/gdbus-test-codegen.c | 14 ++-
6 files changed, 217 insertions(+), 75 deletions(-)
---
diff --git a/docs/reference/gio/gio-sections.txt b/docs/reference/gio/gio-sections.txt
index 751cd1c..af17009 100644
--- a/docs/reference/gio/gio-sections.txt
+++ b/docs/reference/gio/gio-sections.txt
@@ -3294,6 +3294,7 @@ GDBusObjectManagerServer
GDBusObjectManagerServerClass
g_dbus_object_manager_server_new
g_dbus_object_manager_server_get_connection
+g_dbus_object_manager_server_set_connection
g_dbus_object_manager_server_export
g_dbus_object_manager_server_export_uniquely
g_dbus_object_manager_server_unexport
diff --git a/gio/gdbusobjectmanagerserver.c b/gio/gdbusobjectmanagerserver.c
index ecb9024..7f71b24 100644
--- a/gio/gdbusobjectmanagerserver.c
+++ b/gio/gdbusobjectmanagerserver.c
@@ -64,6 +64,9 @@ typedef struct
static void registration_data_free (RegistrationData *data);
+static void export_all (GDBusObjectManagerServer *manager);
+static void unexport_all (GDBusObjectManagerServer *manager, gboolean only_manager);
+
static void g_dbus_object_manager_server_emit_interfaces_added (GDBusObjectManagerServer *manager,
RegistrationData *data,
const gchar *const *interfaces);
@@ -100,10 +103,12 @@ g_dbus_object_manager_server_finalize (GObject *object)
{
GDBusObjectManagerServer *manager = G_DBUS_OBJECT_MANAGER_SERVER (object);
+ if (manager->priv->connection != NULL)
+ {
+ unexport_all (manager, TRUE);
+ g_object_unref (manager->priv->connection);
+ }
g_hash_table_unref (manager->priv->map_object_path_to_data);
- if (manager->priv->manager_reg_id > 0)
- g_warn_if_fail (g_dbus_connection_unregister_object (manager->priv->connection, manager->priv->manager_reg_id));
- g_object_unref (manager->priv->connection);
g_free (manager->priv->object_path);
g_free (manager->priv->object_path_ending_in_slash);
@@ -112,17 +117,17 @@ g_dbus_object_manager_server_finalize (GObject *object)
}
static void
-g_dbus_object_manager_server_get_property (GObject *_object,
- guint prop_id,
- GValue *value,
- GParamSpec *pspec)
+g_dbus_object_manager_server_get_property (GObject *object,
+ guint prop_id,
+ GValue *value,
+ GParamSpec *pspec)
{
- GDBusObjectManagerServer *manager = G_DBUS_OBJECT_MANAGER_SERVER (_object);
+ GDBusObjectManagerServer *manager = G_DBUS_OBJECT_MANAGER_SERVER (object);
switch (prop_id)
{
case PROP_CONNECTION:
- g_value_set_object (value, g_dbus_object_manager_server_get_connection (manager));
+ g_value_set_object (value, manager->priv->connection);
break;
case PROP_OBJECT_PATH:
@@ -130,25 +135,23 @@ g_dbus_object_manager_server_get_property (GObject *_object,
break;
default:
- G_OBJECT_WARN_INVALID_PROPERTY_ID (_object, prop_id, pspec);
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
-g_dbus_object_manager_server_set_property (GObject *_object,
- guint prop_id,
- const GValue *value,
- GParamSpec *pspec)
+g_dbus_object_manager_server_set_property (GObject *object,
+ guint prop_id,
+ const GValue *value,
+ GParamSpec *pspec)
{
- GDBusObjectManagerServer *manager = G_DBUS_OBJECT_MANAGER_SERVER (_object);
+ GDBusObjectManagerServer *manager = G_DBUS_OBJECT_MANAGER_SERVER (object);
switch (prop_id)
{
case PROP_CONNECTION:
- g_assert (manager->priv->connection == NULL);
- g_assert (G_IS_DBUS_CONNECTION (g_value_get_object (value)));
- manager->priv->connection = g_value_dup_object (value);
+ g_dbus_object_manager_server_set_connection (manager, g_value_get_object (value));
break;
case PROP_OBJECT_PATH:
@@ -159,7 +162,7 @@ g_dbus_object_manager_server_set_property (GObject *_object,
break;
default:
- G_OBJECT_WARN_INVALID_PROPERTY_ID (_object, prop_id, pspec);
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
@@ -189,7 +192,6 @@ g_dbus_object_manager_server_class_init (GDBusObjectManagerServerClass *klass)
G_TYPE_DBUS_CONNECTION,
G_PARAM_READABLE |
G_PARAM_WRITABLE |
- G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
/**
@@ -227,28 +229,61 @@ g_dbus_object_manager_server_init (GDBusObjectManagerServer *manager)
/**
* g_dbus_object_manager_server_new:
- * @connection: A #GDBusConnection.
* @object_path: The object path to export the manager object at.
*
* Creates a new #GDBusObjectManagerServer object.
*
- * TODO: make it so that the objects are not exported yet -
- * e.g. start()/stop() semantics.
+ * The returned server isn't yet exported on any connection. To do so,
+ * use g_dbus_object_manager_server_set_connection(). Normally you
+ * want to export all of your objects before doing so to avoid <ulink
+ * url="http://dbus.freedesktop.org/doc/dbus-specification.html#standard-interfaces-objectmanager";>InterfacesAdded</ulink>
+ * signals being emitted.
*
* Returns: A #GDBusObjectManagerServer object. Free with g_object_unref().
*
* Since: 2.30
*/
GDBusObjectManagerServer *
-g_dbus_object_manager_server_new (GDBusConnection *connection,
- const gchar *object_path)
+g_dbus_object_manager_server_new (const gchar *object_path)
{
- g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
g_return_val_if_fail (g_variant_is_object_path (object_path), NULL);
return G_DBUS_OBJECT_MANAGER_SERVER (g_object_new (G_TYPE_DBUS_OBJECT_MANAGER_SERVER,
- "connection", connection,
- "object-path", object_path,
- NULL));
+ "object-path", object_path,
+ NULL));
+}
+
+/**
+ * g_dbus_object_manager_server_set_connection:
+ * @manager: A #GDBusObjectManagerServer.
+ * @connection: (allow-none): A #GDBusConnection or %NULL.
+ *
+ * Exports all objects managed by @manager on @connection. If
+ * @connection is %NULL, stops exporting objects.
+ */
+void
+g_dbus_object_manager_server_set_connection (GDBusObjectManagerServer *manager,
+ GDBusConnection *connection)
+{
+ g_return_if_fail (G_IS_DBUS_OBJECT_MANAGER_SERVER (manager));
+ g_return_if_fail (connection == NULL || G_IS_DBUS_CONNECTION (connection));
+
+ if (manager->priv->connection == connection)
+ goto out;
+
+ if (manager->priv->connection != NULL)
+ {
+ unexport_all (manager, FALSE);
+ g_object_unref (manager->priv->connection);
+ manager->priv->connection = NULL;
+ }
+
+ manager->priv->connection = connection != NULL ? g_object_ref (connection) : NULL;
+ if (manager->priv->connection != NULL)
+ export_all (manager);
+
+ g_object_notify (G_OBJECT (manager), "connection");
+ out:
+ ;
}
/**
@@ -257,8 +292,9 @@ g_dbus_object_manager_server_new (GDBusConnection *connection,
*
* Gets the #GDBusConnection used by @manager.
*
- * Returns: (transfer none): A #GDBusConnection object. Do not free,
- * the object belongs to @manager.
+ * Returns: (transfer full): A #GDBusConnection object or %NULL if
+ * @manager isn't exported on a connection. The returned object should
+ * be freed with g_object_unref().
*
* Since: 2.30
*/
@@ -266,7 +302,7 @@ GDBusConnection *
g_dbus_object_manager_server_get_connection (GDBusObjectManagerServer *manager)
{
g_return_val_if_fail (G_IS_DBUS_OBJECT_MANAGER_SERVER (manager), NULL);
- return manager->priv->connection;
+ return manager->priv->connection != NULL ? g_object_ref (manager->priv->connection) : NULL;
}
/* ---------------------------------------------------------------------------------------------------- */
@@ -283,19 +319,20 @@ registration_data_export_interface (RegistrationData *data,
info = g_dbus_interface_skeleton_get_info (interface_skeleton);
error = NULL;
- if (!g_dbus_interface_skeleton_export (interface_skeleton,
- data->manager->priv->connection,
- object_path,
- &error))
+ if (data->manager->priv->connection != NULL)
{
- /* TODO: probably wrong to complain on stderr */
- g_warning ("%s: Error registering object at %s with interface %s: %s",
- G_STRLOC,
- object_path,
- info->name,
- error->message);
- g_error_free (error);
- goto out;
+ if (!g_dbus_interface_skeleton_export (interface_skeleton,
+ data->manager->priv->connection,
+ object_path,
+ &error))
+ {
+ g_warning ("%s: Error registering object at %s with interface %s: %s",
+ G_STRLOC,
+ object_path,
+ info->name,
+ error->message);
+ g_error_free (error);
+ }
}
g_assert (g_hash_table_lookup (data->map_iface_name_to_iface, info->name) == NULL);
@@ -312,9 +349,6 @@ registration_data_export_interface (RegistrationData *data,
interfaces[1] = NULL;
g_dbus_object_manager_server_emit_interfaces_added (data->manager, data, interfaces);
}
-
- out:
- ;
}
static void
@@ -328,7 +362,8 @@ registration_data_unexport_interface (RegistrationData *data,
iface = g_hash_table_lookup (data->map_iface_name_to_iface, info->name);
g_assert (iface != NULL);
- g_dbus_interface_skeleton_unexport (iface);
+ if (data->manager->priv->connection != NULL)
+ g_dbus_interface_skeleton_unexport (iface);
g_warn_if_fail (g_hash_table_remove (data->map_iface_name_to_iface, info->name));
@@ -376,7 +411,10 @@ registration_data_free (RegistrationData *data)
g_hash_table_iter_init (&iter, data->map_iface_name_to_iface);
while (g_hash_table_iter_next (&iter, NULL, (gpointer) &iface))
- g_dbus_interface_skeleton_unexport (iface);
+ {
+ if (data->manager->priv->connection != NULL)
+ g_dbus_interface_skeleton_unexport (iface);
+ }
g_signal_handlers_disconnect_by_func (data->object, G_CALLBACK (on_interface_added), data);
g_signal_handlers_disconnect_by_func (data->object, G_CALLBACK (on_interface_removed), data);
@@ -761,25 +799,9 @@ static void
g_dbus_object_manager_server_constructed (GObject *object)
{
GDBusObjectManagerServer *manager = G_DBUS_OBJECT_MANAGER_SERVER (object);
- GError *error;
- error = NULL;
- manager->priv->manager_reg_id = g_dbus_connection_register_object (manager->priv->connection,
- manager->priv->object_path,
- (GDBusInterfaceInfo *) &manager_interface_info,
- &manager_interface_vtable,
- manager,
- NULL, /* user_data_free_func */
- &error);
- if (manager->priv->manager_reg_id == 0)
- {
- /* TODO: probably wrong to complain on stderr */
- g_warning ("%s: Error registering manager at %s: %s",
- G_STRLOC,
- manager->priv->object_path,
- error->message);
- g_error_free (error);
- }
+ if (manager->priv->connection != NULL)
+ export_all (manager);
if (G_OBJECT_CLASS (g_dbus_object_manager_server_parent_class)->constructed != NULL)
G_OBJECT_CLASS (g_dbus_object_manager_server_parent_class)->constructed (object);
@@ -787,14 +809,17 @@ g_dbus_object_manager_server_constructed (GObject *object)
static void
g_dbus_object_manager_server_emit_interfaces_added (GDBusObjectManagerServer *manager,
- RegistrationData *data,
- const gchar *const *interfaces)
+ RegistrationData *data,
+ const gchar *const *interfaces)
{
GVariantBuilder array_builder;
GError *error;
guint n;
const gchar *object_path;
+ if (data->manager->priv->connection == NULL)
+ goto out;
+
g_variant_builder_init (&array_builder, G_VARIANT_TYPE ("a{sa{sv}}"));
for (n = 0; interfaces[n] != NULL; n++)
{
@@ -819,18 +844,23 @@ g_dbus_object_manager_server_emit_interfaces_added (GDBusObjectManagerServer *ma
&array_builder),
&error);
g_assert_no_error (error);
+ out:
+ ;
}
static void
g_dbus_object_manager_server_emit_interfaces_removed (GDBusObjectManagerServer *manager,
- RegistrationData *data,
- const gchar *const *interfaces)
+ RegistrationData *data,
+ const gchar *const *interfaces)
{
GVariantBuilder array_builder;
GError *error;
guint n;
const gchar *object_path;
+ if (data->manager->priv->connection == NULL)
+ goto out;
+
g_variant_builder_init (&array_builder, G_VARIANT_TYPE ("as"));
for (n = 0; interfaces[n] != NULL; n++)
g_variant_builder_add (&array_builder, "s", interfaces[n]);
@@ -847,6 +877,8 @@ g_dbus_object_manager_server_emit_interfaces_removed (GDBusObjectManagerServer *
&array_builder),
&error);
g_assert_no_error (error);
+ out:
+ ;
}
/* ---------------------------------------------------------------------------------------------------- */
@@ -920,3 +952,95 @@ dbus_object_manager_interface_init (GDBusObjectManagerIface *iface)
iface->get_object = g_dbus_object_manager_server_get_object;
iface->get_interface = g_dbus_object_manager_server_get_interface;
}
+
+/* ---------------------------------------------------------------------------------------------------- */
+
+static void
+export_all (GDBusObjectManagerServer *manager)
+{
+ GHashTableIter iter;
+ const gchar *object_path;
+ RegistrationData *data;
+ GHashTableIter iface_iter;
+ GDBusInterfaceSkeleton *iface;
+ GError *error;
+
+ g_return_if_fail (manager->priv->connection != NULL);
+
+ error = NULL;
+ g_warn_if_fail (manager->priv->manager_reg_id == 0);
+ manager->priv->manager_reg_id = g_dbus_connection_register_object (manager->priv->connection,
+ manager->priv->object_path,
+ (GDBusInterfaceInfo *) &manager_interface_info,
+ &manager_interface_vtable,
+ manager,
+ NULL, /* user_data_free_func */
+ &error);
+ if (manager->priv->manager_reg_id == 0)
+ {
+ g_warning ("%s: Error registering manager at %s: %s",
+ G_STRLOC,
+ manager->priv->object_path,
+ error->message);
+ g_error_free (error);
+ }
+
+ g_hash_table_iter_init (&iter, manager->priv->map_object_path_to_data);
+ while (g_hash_table_iter_next (&iter, (gpointer) &object_path, (gpointer) &data))
+ {
+ g_hash_table_iter_init (&iface_iter, data->map_iface_name_to_iface);
+ while (g_hash_table_iter_next (&iface_iter, NULL, (gpointer) &iface))
+ {
+ g_warn_if_fail (g_dbus_interface_skeleton_get_connection (iface) == NULL);
+ error = NULL;
+ if (!g_dbus_interface_skeleton_export (iface,
+ manager->priv->connection,
+ object_path,
+ &error))
+ {
+ g_warning ("%s: Error registering object at %s with interface %s: %s",
+ G_STRLOC,
+ object_path,
+ g_dbus_interface_skeleton_get_info (iface)->name,
+ error->message);
+ g_error_free (error);
+ }
+ }
+ }
+}
+
+static void
+unexport_all (GDBusObjectManagerServer *manager, gboolean only_manager)
+{
+ GHashTableIter iter;
+ RegistrationData *data;
+ GHashTableIter iface_iter;
+ GDBusInterfaceSkeleton *iface;
+
+ g_return_if_fail (manager->priv->connection != NULL);
+
+ g_warn_if_fail (manager->priv->manager_reg_id > 0);
+ if (manager->priv->manager_reg_id > 0)
+ {
+ g_warn_if_fail (g_dbus_connection_unregister_object (manager->priv->connection,
+ manager->priv->manager_reg_id));
+ manager->priv->manager_reg_id = 0;
+ }
+ if (only_manager)
+ goto out;
+
+ g_hash_table_iter_init (&iter, manager->priv->map_object_path_to_data);
+ while (g_hash_table_iter_next (&iter, NULL, (gpointer) &data))
+ {
+ g_hash_table_iter_init (&iface_iter, data->map_iface_name_to_iface);
+ while (g_hash_table_iter_next (&iface_iter, NULL, (gpointer) &iface))
+ {
+ g_warn_if_fail (g_dbus_interface_skeleton_get_connection (iface) != NULL);
+ g_dbus_interface_skeleton_unexport (iface);
+ }
+ }
+ out:
+ ;
+}
+
+/* ---------------------------------------------------------------------------------------------------- */
diff --git a/gio/gdbusobjectmanagerserver.h b/gio/gdbusobjectmanagerserver.h
index 5d6d11a..5abe00f 100644
--- a/gio/gdbusobjectmanagerserver.h
+++ b/gio/gdbusobjectmanagerserver.h
@@ -69,9 +69,10 @@ struct _GDBusObjectManagerServerClass
};
GType g_dbus_object_manager_server_get_type (void) G_GNUC_CONST;
-GDBusObjectManagerServer *g_dbus_object_manager_server_new (GDBusConnection *connection,
- const gchar *object_path);
+GDBusObjectManagerServer *g_dbus_object_manager_server_new (const gchar *object_path);
GDBusConnection *g_dbus_object_manager_server_get_connection (GDBusObjectManagerServer *manager);
+void g_dbus_object_manager_server_set_connection (GDBusObjectManagerServer *manager,
+ GDBusConnection *connection);
void g_dbus_object_manager_server_export (GDBusObjectManagerServer *manager,
GDBusObjectSkeleton *object);
void g_dbus_object_manager_server_export_uniquely (GDBusObjectManagerServer *manager,
diff --git a/gio/gio.symbols b/gio/gio.symbols
index 6cb5934..59e1a14 100644
--- a/gio/gio.symbols
+++ b/gio/gio.symbols
@@ -2179,6 +2179,7 @@ g_dbus_object_manager_client_new_sync
g_dbus_object_manager_server_export
g_dbus_object_manager_server_export_uniquely
g_dbus_object_manager_server_get_connection
+g_dbus_object_manager_server_set_connection
g_dbus_object_manager_server_get_type
g_dbus_object_manager_server_new
g_dbus_object_manager_server_unexport
diff --git a/gio/tests/gdbus-example-objectmanager-server.c b/gio/tests/gdbus-example-objectmanager-server.c
index 0ef9c49..367b4f4 100644
--- a/gio/tests/gdbus-example-objectmanager-server.c
+++ b/gio/tests/gdbus-example-objectmanager-server.c
@@ -68,7 +68,7 @@ on_bus_acquired (GDBusConnection *connection,
g_print ("Acquired a message bus connection\n");
/* Create a new org.freedesktop.DBus.ObjectManager rooted at /example/Animals */
- manager = g_dbus_object_manager_server_new (connection, "/example/Animals");
+ manager = g_dbus_object_manager_server_new ("/example/Animals");
for (n = 0; n < 10; n++)
{
@@ -111,6 +111,9 @@ on_bus_acquired (GDBusConnection *connection,
g_dbus_object_manager_server_export (manager, G_DBUS_OBJECT_SKELETON (object));
g_object_unref (object);
}
+
+ /* Export all objects */
+ g_dbus_object_manager_server_set_connection (manager, connection);
}
static void
diff --git a/gio/tests/gdbus-test-codegen.c b/gio/tests/gdbus-test-codegen.c
index 896573c..fe192fa 100644
--- a/gio/tests/gdbus-test-codegen.c
+++ b/gio/tests/gdbus-test-codegen.c
@@ -1762,7 +1762,8 @@ check_object_manager (void)
g_error_free (error);
g_assert (pm == NULL);
- manager = g_dbus_object_manager_server_new (c, "/managed");
+ manager = g_dbus_object_manager_server_new ("/managed");
+ g_dbus_object_manager_server_set_connection (manager, c);
/* Check that the manager object is visible */
info = introspect (c, g_dbus_connection_get_unique_name (c), "/managed", loop);
@@ -1985,6 +1986,17 @@ check_object_manager (void)
om_check_get_all (c, loop,
"({objectpath '/managed/first': {'com.acme.Coyote': {'Mood': <''>}}, '/managed/second': {'org.project.Bar': {'y': <byte 0x00>, 'b': <false>, 'n': <int16 0>, 'q': <uint16 0>, 'i': <0>, 'u': <uint32 0>, 'x': <int64 0>, 't': <uint64 0>, 'd': <0.0>, 's': <''>, 'o': <objectpath '/'>, 'g': <signature ''>, 'ay': <b''>, 'as': <@as []>, 'aay': <@aay []>, 'ao': <@ao []>, 'ag': <@ag []>, 'FinallyNormalName': <''>, 'ReadonlyProperty': <''>, 'unset_i': <0>, 'unset_d': <0.0>, 'unset_s': <''>, 'unset_o': <objectpath '/'>, 'unset_g': <signature ''>, 'unset_ay': <b''>, 'unset_as': <@as []>, 'unset_ao': <@ao []>, 'unset_ag': <@ag []>, 'unset_struct': <(0, 0.0, '', objectpath '/', signature '', @ay [], @as [], @ao [], @ag [])>}, 'org.project.Bat': {'force_i': <0>, 'force_s': <''>, 'force_ay': <@ay []>, 'force_struct': <(0,)>}}},)");
+ /* Set connection to NULL, causing everything to be unexported.. verify this.. and
+ * then set the connection back.. and then check things still work
+ */
+ g_dbus_object_manager_server_set_connection (manager, NULL);
+ info = introspect (c, g_dbus_connection_get_unique_name (c), "/managed", loop);
+ g_assert_cmpint (count_interfaces (info), ==, 0); /* nothing */
+ g_dbus_node_info_unref (info);
+ g_dbus_object_manager_server_set_connection (manager, c);
+ om_check_get_all (c, loop,
+ "({objectpath '/managed/first': {'com.acme.Coyote': {'Mood': <''>}}, '/managed/second': {'org.project.Bar': {'y': <byte 0x00>, 'b': <false>, 'n': <int16 0>, 'q': <uint16 0>, 'i': <0>, 'u': <uint32 0>, 'x': <int64 0>, 't': <uint64 0>, 'd': <0.0>, 's': <''>, 'o': <objectpath '/'>, 'g': <signature ''>, 'ay': <b''>, 'as': <@as []>, 'aay': <@aay []>, 'ao': <@ao []>, 'ag': <@ag []>, 'FinallyNormalName': <''>, 'ReadonlyProperty': <''>, 'unset_i': <0>, 'unset_d': <0.0>, 'unset_s': <''>, 'unset_o': <objectpath '/'>, 'unset_g': <signature ''>, 'unset_ay': <b''>, 'unset_as': <@as []>, 'unset_ao': <@ao []>, 'unset_ag': <@ag []>, 'unset_struct': <(0, 0.0, '', objectpath '/', signature '', @ay [], @as [], @ao [], @ag [])>}, 'org.project.Bat': {'force_i': <0>, 'force_s': <''>, 'force_ay': <@ay []>, 'force_struct': <(0,)>}}},)");
+
/* Also check that the ObjectManagerClient returns these objects - and
* that they are of the right GType cf. what was requested via
* the generated ::get-proxy-type signal handler
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