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Add _g_io_module_get_default(), use to simplify other *_get_default()s

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Add _g_io_module_get_default(), which implements the
figure-out-the-best-available-module-that-is-actually-usable logic,
and use that to simplify g_proxy_resolver_get_default(),
g_settings_backend_get_default(), g_tls_backend_get_default(), and
g_vfs_get_default().

https://bugzilla.gnome.org/show_bug.cgi?id=620932
This commit is contained in:
Dan Winship
2011-06-21 18:21:27 -04:00
parent 38d21f6d8a
commit 1481b7bca3
6 changed files with 161 additions and 174 deletions
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63
gio/gsettingsbackend.c
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@@ -935,6 +935,22 @@ g_settings_backend_create_tree (void)
g_free, g_settings_backend_variant_unref0);
}
static gboolean
g_settings_backend_verify (gpointer impl)
{
GSettingsBackend *backend = impl;
if (strcmp (G_OBJECT_TYPE_NAME (backend), "GMemorySettingsBackend") == 0 &&
g_strcmp0 (g_getenv ("GSETTINGS_BACKEND"), "memory") != 0)
{
g_message ("Using the 'memory' GSettings backend. Your settings "
"will not be saved or shared with other applications.");
}
g_settings_has_backend = TRUE;
return TRUE;
}
/**
* g_settings_backend_get_default:
* @returns: (transfer full): the default #GSettingsBackend
@@ -950,49 +966,12 @@ g_settings_backend_create_tree (void)
GSettingsBackend *
g_settings_backend_get_default (void)
{
static gsize backend;
GSettingsBackend *backend;
if (g_once_init_enter (&backend))
{
GSettingsBackend *instance;
GIOExtensionPoint *point;
GIOExtension *extension;
GType extension_type;
GList *extensions;
const gchar *env;
_g_io_modules_ensure_loaded ();
point = g_io_extension_point_lookup (G_SETTINGS_BACKEND_EXTENSION_POINT_NAME);
extension = NULL;
if ((env = getenv ("GSETTINGS_BACKEND")))
{
extension = g_io_extension_point_get_extension_by_name (point, env);
if (extension == NULL)
g_warning ("Can't find GSettings backend '%s' given in "
"GSETTINGS_BACKEND environment variable", env);
}
if (extension == NULL)
{
extensions = g_io_extension_point_get_extensions (point);
extension = extensions->data;
if (strcmp (g_io_extension_get_name (extension), "memory") == 0)
g_message ("Using the 'memory' GSettings backend. Your settings "
"will not be saved or shared with other applications.");
}
extension_type = g_io_extension_get_type (extension);
instance = g_object_new (extension_type, NULL);
g_settings_has_backend = TRUE;
g_once_init_leave (&backend, (gsize) instance);
}
return g_object_ref ((void *) backend);
backend = _g_io_module_get_default (G_SETTINGS_BACKEND_EXTENSION_POINT_NAME,
"GSETTINGS_BACKEND",
g_settings_backend_verify);
return g_object_ref (backend);
}
/*< private >