include/babeltrace/plugin/plugin-system.h

   1 #ifndef BABELTRACE_PLUGIN_SYSTEM_H
   2 #define BABELTRACE_PLUGIN_SYSTEM_H
   3
   4 /*
   5  * BabelTrace - Babeltrace Plug-in System Interface
   6  *
   7  * This interface is provided for plug-ins to use the Babeltrace
   8  * plug-in system facilities.
   9  *
  10  * Copyright 2015 Jérémie Galarneau <jeremie.galarneau@efficios.com>
  11  *
  12  * Author: Jérémie Galarneau <jeremie.galarneau@efficios.com>
  13  *
  14  * Permission is hereby granted, free of charge, to any person obtaining a copy
  15  * of this software and associated documentation files (the "Software"), to deal
  16  * in the Software without restriction, including without limitation the rights
  17  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  18  * copies of the Software, and to permit persons to whom the Software is
  19  * furnished to do so, subject to the following conditions:
  20  *
  21  * The above copyright notice and this permission notice shall be included in
  22  * all copies or substantial portions of the Software.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  25  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  26  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  27  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  28  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  29  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32
  33 #include <babeltrace/plugin/notification/notification.h>
  34 #include <stdint.h>
  35
  36 #ifdef __cplusplus
  37 extern "C" {
  38 #endif
  39
  40 struct bt_notification;
  41 struct bt_notification_iterator;
  42 struct bt_component;
  43 struct bt_component_factory;
  44 struct bt_value;
  45
  46 typedef enum bt_component_status (*bt_plugin_init_func)(
  47                 struct bt_component_factory *factory);
  48 typedef void (*bt_plugin_exit_func)(void);
  49
  50 /**
  51  * Component private data deallocation function type.
  52  *
  53  * @param component     Component instance
  54  */
  55 typedef void (*bt_component_destroy_cb)(struct bt_component *component);
  56
  57 /**
  58  * Component initialization function type.
  59  *
  60  * A component's private data and required callbacks must be set by this
  61  * function.
  62  *
  63  * @param component     Component instance
  64  * @param params        A dictionary of component parameters
  65  * @returns             One of #bt_component_status values
  66  */
  67 typedef enum bt_component_status (*bt_component_init_cb)(
  68                 struct bt_component *component, struct bt_value *params);
  69
  70 /**
  71  * Get a component's private data.
  72  *
  73  * @param component     Component of which to get the private data
  74  * @returns             Component's private data
  75  */
  76 extern void *bt_component_get_private_data(struct bt_component *component);
  77
  78 /**
  79  * Set a component's private data.
  80  *
  81  * @param component     Component of which to set the private data
  82  * @param data          Component private data
  83  * @returns             One of #bt_component_status values
  84  */
  85 extern enum bt_component_status bt_component_set_private_data(
  86                 struct bt_component *component, void *data);
  87
  88 /**
  89  * Set a component's private data cleanup function.
  90  *
  91  * @param component     Component of which to set the private data destruction
  92  *                      function
  93  * @param data          Component private data clean-up function
  94  * @returns             One of #bt_component_status values
  95  */
  96 extern enum bt_component_status bt_component_set_destroy_cb(
  97                 struct bt_component *component,
  98                 bt_component_destroy_cb destroy);
  99
 100 /** bt_component_souce */
 101 /**
 102  * Iterator initialization function type.
 103  *
 104  * A notification iterator's private data, deinitialization, next, and get
 105  * callbacks must be set by this function.
 106  *
 107  * @param source        Source component instance
 108  * @param iterator      Notification iterator instance
 109  */
 110 typedef enum bt_component_status (*bt_component_source_init_iterator_cb)(
 111                 struct bt_component *, struct bt_notification_iterator *);
 112
 113 /**
 114  * Set a source component's iterator initialization function.
 115  *
 116  * @param source        Source component instance
 117  * @param init_iterator Notification iterator initialization callback
 118  */
 119 extern enum bt_component_status
 120 bt_component_source_set_iterator_init_cb(struct bt_component *source,
 121                 bt_component_source_init_iterator_cb init_iterator);
 122
 123 /** bt_component_sink */
 124 /**
 125  * Notification consumption function type.
 126  *
 127  * @param sink          Sink component instance
 128  * @returns             One of #bt_component_status values
 129  */
 130 typedef enum bt_component_status (*bt_component_sink_consume_cb)(
 131                 struct bt_component *);
 132
 133 /**
 134  * Iterator addition function type.
 135  *
 136  * A sink component may choose to refuse the addition of an iterator
 137  * by not returning BT_COMPONENT_STATUS_OK.
 138  *
 139  * @param sink          Sink component instance
 140  * @returns             One of #bt_component_status values
 141  */
 142 typedef enum bt_component_status (*bt_component_sink_add_iterator_cb)(
 143                 struct bt_component *, struct bt_notification_iterator *);
 144
 145 /**
 146  * Set a sink component's consumption callback.
 147  *
 148  * @param sink          Sink component instance
 149  * @param consume       Consumption callback
 150  * @returns             One of #bt_component_status values
 151  */
 152 extern enum bt_component_status
 153 bt_component_sink_set_consume_cb(struct bt_component *sink,
 154                 bt_component_sink_consume_cb consume);
 155
 156 /**
 157  * Set a sink component's iterator addition callback.
 158  *
 159  * @param sink          Sink component instance
 160  * @param add_iterator  Iterator addition callback
 161  * @returns             One of #bt_component_status values
 162  */
 163 extern enum bt_component_status
 164 bt_component_sink_set_add_iterator_cb(struct bt_component *sink,
 165                 bt_component_sink_add_iterator_cb add_iterator);
 166
 167 /* Defaults to 1. */
 168 extern enum bt_component_status
 169 bt_component_sink_set_minimum_input_count(struct bt_component *sink,
 170                 unsigned int minimum);
 171
 172 /* Defaults to 1. */
 173 extern enum bt_component_status
 174 bt_component_sink_set_maximum_input_count(struct bt_component *sink,
 175                 unsigned int maximum);
 176
 177 extern enum bt_component_status
 178 bt_component_sink_get_input_count(struct bt_component *sink,
 179                 unsigned int *count);
 180
 181 /* May return NULL after an interator has reached its end. */
 182 extern enum bt_component_status
 183 bt_component_sink_get_input_iterator(struct bt_component *sink,
 184                 unsigned int input, struct bt_notification_iterator **iterator);
 185
 186 /** bt_notification_iterator */
 187 /**
 188  * Function returning an iterator's current notification.
 189  *
 190  * @param iterator      Notification iterator instance
 191  * @returns             A notification instance
 192  */
 193 typedef struct bt_notification *(*bt_notification_iterator_get_cb)(
 194                 struct bt_notification_iterator *iterator);
 195
 196 /**
 197  * Function advancing an iterator's position of one element.
 198  *
 199  * @param iterator      Notification iterator instance
 200  * @returns             One of #bt_notification_iterator_status values
 201  */
 202 typedef enum bt_notification_iterator_status (*bt_notification_iterator_next_cb)(
 203                 struct bt_notification_iterator *iterator);
 204
 205 /**
 206  * Function cleaning-up an iterator's private data on destruction.
 207  *
 208  * @param iterator      Notification iterator instance
 209  */
 210 typedef void (*bt_notification_iterator_destroy_cb)(
 211                 struct bt_notification_iterator *iterator);
 212
 213 /**
 214  * Set an iterator's "get" callback which return the current notification.
 215  *
 216  * @param iterator      Notification iterator instance
 217  * @param get           Notification return callback
 218  * @returns             One of #bt_notification_iterator_status values
 219  */
 220 extern enum bt_notification_iterator_status
 221 bt_notification_iterator_set_get_cb(struct bt_notification_iterator *iterator,
 222                 bt_notification_iterator_get_cb get);
 223
 224 /**
 225  * Set an iterator's "next" callback which advances the iterator's position.
 226  *
 227  * @param iterator      Notification iterator instance
 228  * @param next          Iterator "next" callback
 229  * @returns             One of #bt_notification_iterator_status values
 230  */
 231 extern enum bt_notification_iterator_status
 232 bt_notification_iterator_set_next_cb(struct bt_notification_iterator *iterator,
 233                 bt_notification_iterator_next_cb next);
 234
 235 /**
 236  * Set an iterator's "destroy" callback.
 237  *
 238  * @param iterator      Notification iterator instance
 239  * @param next          Iterator destruction callback
 240  * @returns             One of #bt_notification_iterator_status values
 241  */
 242 extern enum bt_notification_iterator_status
 243 bt_notification_iterator_set_destroy_cb(
 244                 struct bt_notification_iterator *iterator,
 245                 bt_notification_iterator_destroy_cb destroy);
 246
 247 /**
 248  * Set an iterator's private data.
 249  *
 250  * @param iterator      Notification iterator instance
 251  * @param data          Iterator private data
 252  * @returns             One of #bt_notification_iterator_status values
 253  */
 254 extern enum bt_notification_iterator_status
 255 bt_notification_iterator_set_private_data(
 256                 struct bt_notification_iterator *iterator, void *data);
 257
 258 /**
 259  * Get an iterator's private data.
 260  *
 261  * @param iterator      Notification iterator instance
 262  * @returns             Iterator instance private data
 263  */
 264 extern void *bt_notification_iterator_get_private_data(
 265                 struct bt_notification_iterator *iterator);
 266
 267 #ifdef __cplusplus
 268 }
 269 #endif
 270
 271 #endif /* BABELTRACE_PLUGIN_SYSTEM_H */