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/*
* Copyright (C) 2014 Michal Ratajsky <michal.ratajsky@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the licence, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include <glib.h>
#include <glib-object.h>
#include <gmodule.h>
#include "matemixer-backend.h"
#include "matemixer-backend-module.h"
G_DEFINE_TYPE (MateMixerBackendModule, mate_mixer_backend_module, G_TYPE_TYPE_MODULE);
struct _MateMixerBackendModulePrivate
{
GModule *gmodule;
gchar *path;
void (*init) (GTypeModule *type_module);
void (*free) (void);
const MateMixerBackendModuleInfo *(*get_info) (void);
};
static gboolean mate_mixer_backend_module_load (GTypeModule *gmodule);
static void mate_mixer_backend_module_unload (GTypeModule *gmodule);
static void
mate_mixer_backend_module_init (MateMixerBackendModule *module)
{
module->priv = G_TYPE_INSTANCE_GET_PRIVATE (
module,
MATE_MIXER_TYPE_BACKEND_MODULE,
MateMixerBackendModulePrivate);
}
static void
mate_mixer_backend_module_finalize (GObject *object)
{
MateMixerBackendModule *module;
module = MATE_MIXER_BACKEND_MODULE (object);
g_free (module->priv->path);
G_OBJECT_CLASS (mate_mixer_backend_module_parent_class)->finalize (object);
}
static void
mate_mixer_backend_module_class_init (MateMixerBackendModuleClass *klass)
{
GObjectClass *object_class;
GTypeModuleClass *gtype_class;
object_class = G_OBJECT_CLASS (klass);
object_class->finalize = mate_mixer_backend_module_finalize;
gtype_class = G_TYPE_MODULE_CLASS (klass);
gtype_class->load = mate_mixer_backend_module_load;
gtype_class->unload = mate_mixer_backend_module_unload;
g_type_class_add_private (object_class, sizeof (MateMixerBackendModulePrivate));
}
static gboolean
mate_mixer_backend_module_load (GTypeModule *type_module)
{
MateMixerBackendModule *module;
module = MATE_MIXER_BACKEND_MODULE (type_module);
module->priv->gmodule = g_module_open (
module->priv->path,
G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL);
if (module->priv->gmodule == NULL) {
g_warning ("Failed to load backend module %s: %s",
module->priv->path,
g_module_error ());
return FALSE;
}
/* Validate library symbols that each backend module must provide */
if (!g_module_symbol (module->priv->gmodule,
"backend_module_init",
(gpointer *) &module->priv->init) ||
!g_module_symbol (module->priv->gmodule,
"backend_module_free",
(gpointer *) &module->priv->free) ||
!g_module_symbol (module->priv->gmodule,
"backend_module_get_info",
(gpointer *) &module->priv->get_info)) {
g_warning ("Failed to load backend module %s: %s",
module->priv->path,
g_module_error ());
g_module_close (module->priv->gmodule);
return FALSE;
}
g_debug ("Loaded backend module %s", module->priv->path);
module->priv->init (type_module);
return TRUE;
}
static void
mate_mixer_backend_module_unload (GTypeModule *type_module)
{
MateMixerBackendModule *module;
module = MATE_MIXER_BACKEND_MODULE (type_module);
module->priv->free ();
g_module_close (module->priv->gmodule);
}
MateMixerBackendModule *
mate_mixer_backend_module_new (const gchar *path)
{
MateMixerBackendModule *module;
g_return_val_if_fail (path != NULL, NULL);
module = g_object_newv (MATE_MIXER_TYPE_BACKEND_MODULE, 0, NULL);
module->priv->path = g_strdup (path);
g_type_module_set_name (G_TYPE_MODULE (module), path);
return module;
}
const MateMixerBackendModuleInfo *
mate_mixer_backend_module_get_info (MateMixerBackendModule *module)
{
g_return_val_if_fail (MATE_MIXER_IS_BACKEND_MODULE (module), NULL);
return module->priv->get_info ();
}
const gchar *
mate_mixer_backend_module_get_path (MateMixerBackendModule *module)
{
g_return_val_if_fail (MATE_MIXER_IS_BACKEND_MODULE (module), NULL);
return module->priv->path;
}
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