#include "gdesktopappinfo.h"
#endif
#include "gioalias.h"
+#include <glib/gstdio.h>
/**
* SECTION:giomodule
*/
struct _GIOModule {
GTypeModule parent_instance;
-
+
gchar *filename;
GModule *library;
-
+ gboolean initialized; /* The module was loaded at least once */
+
void (* load) (GIOModule *module);
void (* unload) (GIOModule *module);
};
static gboolean g_io_module_load_module (GTypeModule *gmodule);
static void g_io_module_unload_module (GTypeModule *gmodule);
+struct _GIOExtension {
+ char *name;
+ GType type;
+ gint priority;
+};
+
+struct _GIOExtensionPoint {
+ GType required_type;
+ char *name;
+ GList *extensions;
+ GList *lazy_load_modules;
+};
+
+static GHashTable *extension_points = NULL;
+G_LOCK_DEFINE_STATIC(extension_points);
+
G_DEFINE_TYPE (GIOModule, g_io_module, G_TYPE_TYPE_MODULE);
static void
/* Initialize the loaded module */
module->load (module);
+ module->initialized = TRUE;
return TRUE;
}
#endif
}
+/**
+ * g_io_modules_scan_all_in_directory:
+ * @dirname: pathname for a directory containing modules to scan.
+ *
+ * Scans all the modules in the specified directory, ensuring that
+ * any extension point implemented by a module is registered.
+ *
+ * This may not actually load and initialize all the types in each
+ * module, some modules may be lazily loaded and initialized when
+ * an extension point it implementes is used with e.g.
+ * g_io_extension_point_get_extensions() or
+ * g_io_extension_point_get_extension_by_name().
+ *
+ * If you need to guarantee that all types are loaded in all the modules,
+ * use g_io_modules_scan_all_in_directory().
+ *
+ * Since: 2.24
+ **/
+void
+g_io_modules_scan_all_in_directory (const char *dirname)
+{
+ const gchar *name;
+ char *filename;
+ GDir *dir;
+ struct stat statbuf;
+ char *data;
+ time_t cache_mtime;
+ GHashTable *cache;
+
+ if (!g_module_supported ())
+ return;
+
+ dir = g_dir_open (dirname, 0, NULL);
+ if (!dir)
+ return;
+
+ filename = g_build_filename (dirname, "giomodule.cache", NULL);
+
+ cache = g_hash_table_new_full (g_str_hash, g_str_equal,
+ g_free, (GDestroyNotify)g_strfreev);
+
+ cache_mtime = 0;
+ if (g_stat (filename, &statbuf) == 0 &&
+ g_file_get_contents (filename, &data, NULL, NULL))
+ {
+ char **lines;
+ int i;
+
+ /* Cache mtime is the time the cache file was created, any file
+ * that has a ctime before this was created then and not modified
+ * since then (userspace can't change ctime). Its possible to change
+ * the ctime forward without changing the file content, by e.g.
+ * chmoding the file, but this is uncommon and will only cause us
+ * to not use the cache so will not cause bugs.
+ */
+ cache_mtime = statbuf.st_mtime;
+
+ lines = g_strsplit (data, "\n", -1);
+ g_free (data);
+
+ for (i = 0; lines[i] != NULL; i++)
+ {
+ char *line = lines[i];
+ char *file;
+ char *colon;
+ char **extension_points;
+
+ if (line[0] == '#')
+ continue;
+
+ colon = strchr (line, ':');
+ if (colon == NULL || line == colon)
+ continue; /* Invalid line, ignore */
+
+ *colon = 0; /* terminate filename */
+ file = strdup (line);
+ colon++; /* after colon */
+
+ while (g_ascii_isspace (*colon))
+ colon++;
+
+ extension_points = g_strsplit (colon, ",", -1);
+ g_hash_table_insert (cache, g_strdup (file), extension_points);
+ }
+ g_strfreev (lines);
+ }
+
+ while ((name = g_dir_read_name (dir)))
+ {
+ if (is_valid_module_name (name))
+ {
+ GIOExtensionPoint *extension_point;
+ GIOModule *module;
+ gchar *path;
+ char **extension_points;
+ int i;
+
+ path = g_build_filename (dirname, name, NULL);
+ module = g_io_module_new (path);
+
+ extension_points = g_hash_table_lookup (cache, name);
+ if (extension_points != NULL &&
+ g_stat (path, &statbuf) == 0 &&
+ statbuf.st_ctime <= cache_mtime)
+ {
+ /* Lazy load/init the library when first required */
+ for (i = 0; extension_points[i] != NULL; i++)
+ {
+ extension_point =
+ g_io_extension_point_register (extension_points[i]);
+ extension_point->lazy_load_modules =
+ g_list_prepend (extension_point->lazy_load_modules,
+ module);
+ }
+ }
+ else
+ {
+ /* Try to load and init types */
+ if (g_type_module_use (G_TYPE_MODULE (module)))
+ g_type_module_unuse (G_TYPE_MODULE (module)); /* Unload */
+ else
+ { /* Failure to load */
+ g_printerr ("Failed to load module: %s\n", path);
+ g_object_unref (module);
+ g_free (path);
+ continue;
+ }
+ }
+
+ g_free (path);
+ }
+ }
+
+ g_dir_close (dir);
+
+ g_hash_table_destroy (cache);
+}
+
+
/**
* g_io_modules_load_all_in_directory:
* @dirname: pathname for a directory containing modules to load.
*
* Loads all the modules in the specified directory.
*
+ * If don't require all modules to be initialized (and thus registering
+ * all gtypes) then you can use g_io_modules_scan_all_in_directory()
+ * which allows delayed/lazy loading of modules.
+ *
* Returns: a list of #GIOModules loaded from the directory,
* All the modules are loaded into memory, if you want to
* unload them (enabling on-demand loading) you must call
G_UNLOCK (loaded_dirs);
}
-struct _GIOExtension {
- char *name;
- GType type;
- gint priority;
-};
-
-struct _GIOExtensionPoint {
- GType required_type;
- char *name;
- GList *extensions;
-};
-
-static GHashTable *extension_points = NULL;
-G_LOCK_DEFINE_STATIC(extension_points);
-
-
static void
g_io_extension_point_free (GIOExtensionPoint *ep)
{
NULL,
(GDestroyNotify)g_io_extension_point_free);
- if (g_hash_table_lookup (extension_points, name) != NULL)
+ ep = g_hash_table_lookup (extension_points, name);
+ if (ep != NULL)
{
- g_warning ("Extension point %s registered multiple times", name);
G_UNLOCK (extension_points);
- return NULL;
+ return ep;
}
ep = g_new0 (GIOExtensionPoint, 1);
return extension_point->required_type;
}
+void
+lazy_load_modules (GIOExtensionPoint *extension_point)
+{
+ GIOModule *module;
+ GList *l;
+
+ for (l = extension_point->lazy_load_modules; l != NULL; l = l->next)
+ {
+ module = l->data;
+
+ if (!module->initialized)
+ {
+ if (g_type_module_use (G_TYPE_MODULE (module)))
+ g_type_module_unuse (G_TYPE_MODULE (module)); /* Unload */
+ else
+ g_printerr ("Failed to load module: %s\n",
+ module->filename);
+ }
+ }
+}
+
/**
* g_io_extension_point_get_extensions:
* @extension_point: a #GIOExtensionPoint
GList *
g_io_extension_point_get_extensions (GIOExtensionPoint *extension_point)
{
+ lazy_load_modules (extension_point);
return extension_point->extensions;
}
{
GList *l;
+ lazy_load_modules (extension_point);
for (l = extension_point->extensions; l != NULL; l = l->next)
{
GIOExtension *e = l->data;
GType g_io_module_get_type (void) G_GNUC_CONST;
GIOModule *g_io_module_new (const gchar *filename);
+void g_io_modules_scan_all_in_directory (const char *dirname);
GList *g_io_modules_load_all_in_directory (const gchar *dirname);
GIOExtensionPoint *g_io_extension_point_register (const char *name);
**/
void g_io_module_unload (GIOModule *module);
+/**
+ * g_io_module_query:
+ *
+ * Optional API for GIO modules to implement.
+ *
+ * Should return a list of all the extension points that may be
+ * implemented in this module.
+ *
+ * This method will not be called in normal use, however it may be
+ * called when probing existing modules and recording which extension
+ * points that this modle is used for. This means we won't have to
+ * load and initialze this module unless its needed
+ *
+ * If this function is not implemented by the module the module will
+ * always be loaded, initialized and then unloaded on application startup
+ * so that it can register its extension points during init.
+ *
+ * Note that a module need not actually implement all the extension points
+ * that g_io_module_query returns, since the exact list of extension may
+ * depend on runtime issues. However all extension points actually implemented
+ * must be returned by g_io_module_query (if defined).
+ *
+ * When installing a module that implements g_io_module_query you must
+ * run gio-querymodules in order to build the cache files required for
+ * lazy loading.
+ *
+ * Since: 2.24
+ **/
+char **g_io_module_query (void);
+
G_END_DECLS
#endif /* __G_IO_MODULE_H__ */
projects / platform / upstream / glib.git / commitdiff