Decouple component class from plugin subsystem, remove component factory

[babeltrace.git] / include / babeltrace / plugin / plugin.h

diff --git a/include/babeltrace/plugin/plugin.h b/include/babeltrace/plugin/plugin.h
index 9c2c5f00606bb581b397e8a243bba9aeff30d7a6..10581984f9519cc69ad08a054a0840a67d492396 100644 (file)
--- a/include/babeltrace/plugin/plugin.h
+++ b/include/babeltrace/plugin/plugin.h
@@ -1,10 +1,11 @@
-#ifndef BABELTRACE_PLUGIN_H
-#define BABELTRACE_PLUGIN_H
+#ifndef BABELTRACE_PLUGIN_PLUGIN_H
+#define BABELTRACE_PLUGIN_PLUGIN_H
 
 /*
- * BabelTrace - Plug-in
+ * BabelTrace - Babeltrace Plug-in Interface
  *
- * Copyright 2015 Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ * Copyright 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ * Copyright 2017 Philippe Proulx <pproulx@efficios.com>
  *
  * Author: Jérémie Galarneau <jeremie.galarneau@efficios.com>
  *
@@ -27,47 +28,88 @@
  * SOFTWARE.
  */
 
-#include <stdint.h>
+#include <stddef.h>
+#include <stdbool.h>
+#include <babeltrace/component/component-class.h>
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 struct bt_plugin;
-struct bt_notification;
-
-enum bt_plugin_type {
-       BT_PLUGIN_TYPE_UNKNOWN = -1,
-       /* A source plug-in is a notification generator. */
-       BT_PLUGIN_TYPE_SOURCE = 0,
-       /* A sink plug-in handles incoming notifications. */
-       BT_PLUGIN_TYPE_SINK = 1,
-       /* A filter plug-in implements both SOURCE and SINK interfaces. */
-       BT_PLUGIN_TYPE_FILTER = 2,
+struct bt_component_class;
+
+/**
+ * Status code. Errors are always negative.
+ */
+enum bt_plugin_status {
+       /** No error, okay. */
+       BT_PLUGIN_STATUS_OK =           0,
+       /** General error. */
+       BT_PLUGIN_STATUS_ERROR =        -1,
+       /** Memory allocation failure. */
+       BT_PLUGIN_STATUS_NOMEM =        -4,
 };
 
+extern struct bt_plugin *bt_plugin_create_from_file(const char *path);
+
+extern struct bt_plugin **bt_plugin_create_all_from_dir(const char *path,
+               bool recurse);
+
+extern struct bt_plugin **bt_plugin_create_all_from_static(void);
+
+/**
+ * Get the name of a plug-in.
+ *
+ * @param plugin       An instance of a plug-in
+ * @returns            Plug-in name or NULL on error
+ */
+extern const char *bt_plugin_get_name(struct bt_plugin *plugin);
+
+/**
+ * Get the name of a plug-in's author.
+ *
+ * @param plugin       An instance of a plug-in
+ * @returns            Plug-in author or NULL on error
+ */
+extern const char *bt_plugin_get_author(struct bt_plugin *plugin);
+
 /**
- * Plug-in discovery functions.
+ * Get the license of a plug-in.
  *
- * The Babeltrace plug-in architecture mandates that a given plug-in shared
- * object only define one plug-in. These functions are used to query a about
- * shared object about its attributes.
+ * @param plugin       An instance of a plug-in
+ * @returns            Plug-in license or NULL on error
+ */
+extern const char *bt_plugin_get_license(struct bt_plugin *plugin);
+
+/**
+ * Get the decription of a plug-in.
  *
- * The functions marked as mandatory MUST be exported by the shared object
- * to be considered a valid plug-in.
+ * @param plugin       An instance of a plug-in
+ * @returns            Plug-in description or NULL if none is available
  */
-enum bt_plugin_type bt_plugin_get_type(void);
-const char *bt_plugin_get_name(void);
+extern const char *bt_plugin_get_description(struct bt_plugin *plugin);
+
+/**
+ * Get the path of a plug-in.
+ *
+ * @param plugin       An instance of a plug-in
+ * @returns            Plug-in path or NULL on error
+ */
+extern const char *bt_plugin_get_path(struct bt_plugin *plugin);
+
+extern int bt_plugin_get_component_class_count(struct bt_plugin *plugin);
 
-/* TODO: document mandatory fields and their expected types */
-int bt_plugin_set_parameters(struct bt_plugin *plugin,
-               struct bt_ctf_field *field);
+extern struct bt_component_class *bt_plugin_get_component_class(
+               struct bt_plugin *plugin, size_t index);
 
-void bt_plugin_get(struct bt_plugin *plugin);
-void bt_plugin_put(struct bt_plugin *plugin);
+extern
+struct bt_component_class *bt_plugin_get_component_class_by_name_and_type(
+               struct bt_plugin *plugin, const char *name,
+               enum bt_component_type type);
 
 #ifdef __cplusplus
 }
 #endif
 
-#endif /* BABELTRACE_PLUGIN_H */
+#endif /* BABELTRACE_PLUGIN_PLUGIN_H */