include/babeltrace/plugin/component-factory.h

   1 #ifndef BABELTRACE_PLUGIN_COMPONENT_FACTORY_H
   2 #define BABELTRACE_PLUGIN_COMPONENT_FACTORY_H
   3
   4 /*
   5  * Babeltrace - Component Factory Class Interface.
   6  *
   7  * Copyright 2015 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a copy
  10  * of this software and associated documentation files (the "Software"), to deal
  11  * in the Software without restriction, including without limitation the rights
  12  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  13  * copies of the Software, and to permit persons to whom the Software is
  14  * furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included in
  17  * all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  22  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  23  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  25  * SOFTWARE.
  26  */
  27
  28 #include <babeltrace/plugin/component.h>
  29 #include <babeltrace/plugin/source.h>
  30 #include <babeltrace/plugin/sink.h>
  31 #include <babeltrace/plugin/filter.h>
  32 #include <babeltrace/plugin/plugin-system.h>
  33 #include <babeltrace/values.h>
  34
  35 #ifdef __cplusplus
  36 extern "C" {
  37 #endif
  38
  39 /**
  40  * Status code. Errors are always negative.
  41  */
  42 enum bt_component_factory_status {
  43         /** General error. */
  44         BT_COMPONENT_FACTORY_STATUS_ERROR =             -128,
  45
  46         /** Invalid plugin. */
  47         BT_COMPONENT_FACTORY_STATUS_INVAL_PLUGIN =      -6,
  48
  49         /** Invalid arguments. */
  50         BT_COMPONENT_FACTORY_STATUS_INVAL =             -5,
  51
  52         /** Memory allocation failure. */
  53         BT_COMPONENT_FACTORY_STATUS_NOMEM =             -4,
  54
  55         /** I/O error. */
  56         BT_COMPONENT_FACTORY_STATUS_IO =                -3,
  57
  58         /** No such file or directory. */
  59         BT_COMPONENT_FACTORY_STATUS_NOENT =             -2,
  60
  61         /** Operation not permitted. */
  62         BT_COMPONENT_FACTORY_STATUS_PERM =              -1,
  63
  64         /** No error, okay. */
  65         BT_COMPONENT_FACTORY_STATUS_OK =                0,
  66 };
  67
  68 struct bt_component_factory;
  69
  70 /**
  71  * Create a component factory.
  72  *
  73  * @returns     An instance of component factory
  74  */
  75 extern struct bt_component_factory *bt_component_factory_create(void);
  76
  77 /**
  78  * Get the number of component classes registered to the component factory.
  79  *
  80  * @param factory       A component factory instance
  81  * @returns             The number of component classes registered to the
  82  *                      component factory, or a negative value on error.
  83  */
  84 extern int bt_component_factory_get_component_class_count(
  85                 struct bt_component_factory *factory);
  86
  87 /**
  88  * Get component class at index.
  89  *
  90  * @param factory       A component factory instance
  91  * @param index         Index of the component class to return
  92  * @returns             A component class instance, NULL on error.
  93  */
  94 extern struct bt_component_class *bt_component_factory_get_component_class_index(
  95                 struct bt_component_factory *factory, int index);
  96
  97 /**
  98  * Look-up component class.
  99  *
 100  * @param factory               A component factory instance
 101  * @param plugin_name           Name of the plug-in which registered the
 102  *                              component class
 103  * @param type                  Component type (@see #bt_component_type)
 104  * @param component_name        Component name
 105  * @returns                     A component class instance, NULL on error.
 106  */
 107 extern struct bt_component_class *bt_component_factory_get_component_class(
 108                 struct bt_component_factory *factory,
 109                 const char *plugin_name, enum bt_component_type type,
 110                 const char *component_name);
 111
 112 /**
 113  * Recursively load and register Babeltrace plugins under a given path.
 114  *
 115  * Path will be traversed recursively if it is a directory, otherwise only the
 116  * provided file will be loaded.
 117  *
 118  * @param factory       A component factory instance
 119  * @param path          A path to a file or directory
 120  * @returns             One of #bt_component_factory_status values
 121  */
 122 extern enum bt_component_factory_status bt_component_factory_load(
 123                 struct bt_component_factory *factory, const char *path);
 124
 125 extern enum bt_component_factory_status
 126 bt_component_factory_register_source_component_class(
 127                 struct bt_component_factory *factory, const char *name,
 128                 const char *description, bt_component_init_cb init);
 129
 130 extern enum bt_component_factory_status
 131 bt_component_factory_register_sink_component_class(
 132                 struct bt_component_factory *factory, const char *name,
 133                 const char *description, bt_component_init_cb init);
 134
 135 #ifdef __cplusplus
 136 }
 137 #endif
 138
 139 #endif /* BABELTRACE_PLUGIN_COMPONENT_FACTORY_H */