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authorGuido Günther <agx@sigxcpu.org>2010-05-04 07:51:21 +0200
committerGuido Günther <agx@sigxcpu.org>2010-05-04 07:51:21 +0200
commit29320e2db78ba6e6b56af39219b0ce213b77592b (patch)
treeab74eb3246190f92d2b7a3eb82aa73c7d5a8f67b /src/ka-plugin-loader.c
parentImported Upstream version 0.15 (diff)
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Imported Upstream version 0.16~rc1
Diffstat (limited to 'src/ka-plugin-loader.c')
-rw-r--r--src/ka-plugin-loader.c204
1 files changed, 204 insertions, 0 deletions
diff --git a/src/ka-plugin-loader.c b/src/ka-plugin-loader.c
new file mode 100644
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--- /dev/null
+++ b/src/ka-plugin-loader.c
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+/*
+ * Copyright (C) 2010 Guido Guenther <agx@sigxcpu.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <gconf/gconf-client.h>
+
+#include "ka-plugin-loader.h"
+#include "ka-plugin.h"
+#include "ka-applet-priv.h"
+#include "ka-gconf-tools.h"
+
+#include <gmodule.h>
+
+G_DEFINE_TYPE (KaPluginLoader, ka_plugin_loader, G_TYPE_OBJECT)
+
+#define GET_PRIVATE(o) \
+ (G_TYPE_INSTANCE_GET_PRIVATE ((o), KA_TYPE_PLUGIN_LOADER, KaPluginLoaderPrivate))
+
+typedef struct _KaPluginLoaderPrivate KaPluginLoaderPrivate;
+
+struct _KaPluginLoaderPrivate {
+ KaApplet *applet;
+ GSList *active_plugins;
+};
+
+
+static KaPlugin*
+load_plugin (const char *path)
+{
+ KaPlugin *plugin = NULL;
+ GModule *module;
+ KaPluginCreateFunc plugin_create_func;
+ int *major_plugin_version, *minor_plugin_version;
+
+ module = g_module_open (path, G_MODULE_BIND_LAZY);
+ if (!module) {
+ g_warning ("Could not load plugin %s: %s", path, g_module_error ());
+ return NULL;
+ }
+
+ if (!g_module_symbol (module, "ka_plugin_major_version",(gpointer *) &major_plugin_version)) {
+ g_warning ("Could not load plugin %s: Missing major version info", path);
+ goto out;
+ }
+
+ if (*major_plugin_version != KA_PLUGIN_MAJOR_VERSION) {
+ g_warning ("Could not load plugin %s: Plugin major version %d, %d is required",
+ path, *major_plugin_version, KA_PLUGIN_MAJOR_VERSION);
+ goto out;
+ }
+
+ if (!g_module_symbol (module, "ka_plugin_minor_version", (gpointer *) &minor_plugin_version)) {
+ g_warning ("Could not load plugin %s: Missing minor version info", path);
+ goto out;
+ }
+
+ if (*minor_plugin_version != KA_PLUGIN_MINOR_VERSION) {
+ g_warning ("Could not load plugin %s: Plugin minor version %d, %d is required",
+ path, *minor_plugin_version, KA_PLUGIN_MINOR_VERSION);
+ goto out;
+ }
+
+ if (!g_module_symbol (module, "ka_plugin_create", (gpointer *) &plugin_create_func)) {
+ g_warning ("Could not load plugin %s: %s", path, g_module_error ());
+ goto out;
+ }
+
+ plugin = (*plugin_create_func) ();
+ if (plugin) {
+ g_object_weak_ref (G_OBJECT (plugin), (GWeakNotify) g_module_close, module);
+ g_message ("Loaded plugin %s", ka_plugin_get_name (plugin));
+ } else
+ g_warning ("Could not load plugin %s: initialization failed", path);
+out:
+ if (!plugin)
+ g_module_close (module);
+
+ return plugin;
+}
+
+
+static void
+load_plugins (KaPluginLoader *self)
+{
+ int i;
+ KaPluginLoaderPrivate *priv = GET_PRIVATE (self);
+ const char *pname;
+ GConfClient *gconf;
+ GSList *plugins = NULL;
+
+ if (!g_module_supported ()) {
+ g_warning ("GModules are not supported on your platform!");
+ return;
+ }
+ gconf = ka_applet_get_gconf_client (priv->applet);
+
+ /* For now we only load the plugins on program startup */
+ ka_gconf_get_string_list(gconf, KA_GCONF_KEY_PLUGINS_ENABLED, &plugins);
+ if (!plugins) {
+ g_message ("No plugins to load");
+ return ;
+ }
+
+ for (i=0; (pname = g_slist_nth_data (plugins, i)) != NULL; i++) {
+ char *path;
+ char *fname;
+ KaPlugin *plugin;
+
+ fname = g_strdup_printf("libka-plugin-%s.%s", pname, G_MODULE_SUFFIX);
+ path = g_module_build_path (KA_PLUGINS_DIR, fname);
+
+ plugin = load_plugin (path);
+ if (plugin) {
+ ka_plugin_activate(plugin, priv->applet);
+ priv->active_plugins = g_slist_prepend (priv->active_plugins, plugin);
+ }
+ g_free (fname);
+ g_free (path);
+ }
+ g_slist_free (plugins);
+}
+
+
+static void
+deactivate_plugin(gpointer plugin, gpointer user_data)
+{
+ KaApplet *applet = KA_APPLET (user_data);
+
+ KA_DEBUG ("Deactivating plugin %s", ka_plugin_get_name (plugin));
+ ka_plugin_deactivate (plugin, applet);
+}
+
+
+static void
+ka_plugin_loader_dispose(GObject *object)
+{
+ KaPluginLoader *self = KA_PLUGIN_LOADER(object);
+ KaPluginLoaderPrivate *priv = GET_PRIVATE (self);
+ GObjectClass *parent_class = G_OBJECT_CLASS (ka_plugin_loader_parent_class);
+
+ /* We need to do this before dropping the ref on applet */
+ g_slist_foreach (priv->active_plugins, deactivate_plugin, priv->applet);
+ g_slist_free (priv->active_plugins);
+
+ if (priv->applet)
+ priv->applet = NULL;
+
+ if (parent_class->dispose != NULL)
+ parent_class->dispose (object);
+}
+
+
+static void
+ka_plugin_loader_class_init (KaPluginLoaderClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS(klass);
+
+ object_class->dispose = ka_plugin_loader_dispose;
+ g_type_class_add_private (klass, sizeof (KaPluginLoaderPrivate));
+}
+
+
+static void
+ka_plugin_loader_init (KaPluginLoader *self)
+{
+ KaPluginLoaderPrivate *priv = GET_PRIVATE (self);
+ priv->active_plugins = NULL;
+}
+
+
+static KaPluginLoader*
+ka_plugin_loader_new (void)
+{
+ return g_object_new (KA_TYPE_PLUGIN_LOADER, NULL);
+}
+
+
+KaPluginLoader*
+ka_plugin_loader_create (KaApplet* applet)
+{
+ KaPluginLoader *loader;
+ KaPluginLoaderPrivate *priv;
+
+ loader = ka_plugin_loader_new();
+ priv = GET_PRIVATE (loader);
+ priv->applet = applet;
+ load_plugins (loader);
+
+ return loader;
+}
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