lib/graph/component.c

   1 /*
   2  * Copyright 2017-2018 Philippe Proulx <pproulx@efficios.com>
   3  * Copyright 2015 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a copy
   6  * of this software and associated documentation files (the "Software"), to deal
   7  * in the Software without restriction, including without limitation the rights
   8  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   9  * copies of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in
  13  * all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  18  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  */
  23
  24 #define BT_LOG_TAG "COMP"
  25 #include <babeltrace/lib-logging-internal.h>
  26
  27 #include <babeltrace/graph/self-component.h>
  28 #include <babeltrace/graph/component-const.h>
  29 #include <babeltrace/graph/component-source-const.h>
  30 #include <babeltrace/graph/component-filter-const.h>
  31 #include <babeltrace/graph/component-sink-const.h>
  32 #include <babeltrace/graph/component-internal.h>
  33 #include <babeltrace/graph/component-class-internal.h>
  34 #include <babeltrace/graph/component-source-internal.h>
  35 #include <babeltrace/graph/component-filter-internal.h>
  36 #include <babeltrace/graph/component-sink-internal.h>
  37 #include <babeltrace/graph/connection-internal.h>
  38 #include <babeltrace/graph/graph-internal.h>
  39 #include <babeltrace/graph/notification-iterator-internal.h>
  40 #include <babeltrace/graph/port-internal.h>
  41 #include <babeltrace/babeltrace-internal.h>
  42 #include <babeltrace/compiler-internal.h>
  43 #include <babeltrace/object.h>
  44 #include <babeltrace/types.h>
  45 #include <babeltrace/value.h>
  46 #include <babeltrace/value-internal.h>
  47 #include <babeltrace/assert-internal.h>
  48 #include <babeltrace/assert-pre-internal.h>
  49 #include <stdint.h>
  50 #include <inttypes.h>
  51
  52 static
  53 struct bt_component * (* const component_create_funcs[])(
  54                 const struct bt_component_class *) = {
  55         [BT_COMPONENT_CLASS_TYPE_SOURCE] = bt_component_source_create,
  56         [BT_COMPONENT_CLASS_TYPE_SINK] = bt_component_sink_create,
  57         [BT_COMPONENT_CLASS_TYPE_FILTER] = bt_component_filter_create,
  58 };
  59
  60 static
  61 void (*component_destroy_funcs[])(struct bt_component *) = {
  62         [BT_COMPONENT_CLASS_TYPE_SOURCE] = bt_component_source_destroy,
  63         [BT_COMPONENT_CLASS_TYPE_SINK] = bt_component_sink_destroy,
  64         [BT_COMPONENT_CLASS_TYPE_FILTER] = bt_component_filter_destroy,
  65 };
  66
  67 static
  68 void finalize_component(struct bt_component *comp)
  69 {
  70         typedef void (*method_t)(void *);
  71
  72         method_t method = NULL;
  73
  74         BT_ASSERT(comp);
  75
  76         switch (comp->class->type) {
  77         case BT_COMPONENT_CLASS_TYPE_SOURCE:
  78         {
  79                 struct bt_component_class_source *src_cc = (void *) comp->class;
  80
  81                 method = (method_t) src_cc->methods.finalize;
  82                 break;
  83         }
  84         case BT_COMPONENT_CLASS_TYPE_FILTER:
  85         {
  86                 struct bt_component_class_filter *flt_cc = (void *) comp->class;
  87
  88                 method = (method_t) flt_cc->methods.finalize;
  89                 break;
  90         }
  91         case BT_COMPONENT_CLASS_TYPE_SINK:
  92         {
  93                 struct bt_component_class_sink *sink_cc = (void *) comp->class;
  94
  95                 method = (method_t) sink_cc->methods.finalize;
  96                 break;
  97         }
  98         default:
  99                 abort();
 100         }
 101
 102         if (method) {
 103                 BT_LIB_LOGD("Calling user's finalization method: "
 104                         "%![comp-]+c", comp);
 105                 method(comp);
 106         }
 107 }
 108
 109 static
 110 void destroy_component(struct bt_object *obj)
 111 {
 112         struct bt_component *component = NULL;
 113         int i;
 114
 115         if (!obj) {
 116                 return;
 117         }
 118
 119         /*
 120          * The component's reference count is 0 if we're here. Increment
 121          * it to avoid a double-destroy (possibly infinitely recursive).
 122          * This could happen for example if the component's finalization
 123          * function does bt_object_get_ref() (or anything that causes
 124          * bt_object_get_ref() to be called) on itself (ref. count goes
 125          * from 0 to 1), and then bt_object_put_ref(): the reference
 126          * count would go from 1 to 0 again and this function would be
 127          * called again.
 128          */
 129         obj->ref_count++;
 130         component = container_of(obj, struct bt_component, base);
 131         BT_LIB_LOGD("Destroying component: %![comp-]+c, %![graph-]+g",
 132                 component, bt_component_borrow_graph(component));
 133
 134         /* Call destroy listeners in reverse registration order */
 135         BT_LOGD_STR("Calling destroy listeners.");
 136
 137         for (i = component->destroy_listeners->len - 1; i >= 0; i--) {
 138                 struct bt_component_destroy_listener *listener =
 139                         &g_array_index(component->destroy_listeners,
 140                                 struct bt_component_destroy_listener, i);
 141
 142                 listener->func(component, listener->data);
 143         }
 144
 145         /*
 146          * User data is destroyed first, followed by the concrete
 147          * component instance. Do not finalize if the component's user
 148          * initialization method failed in the first place.
 149          */
 150         if (component->initialized) {
 151                 finalize_component(component);
 152         }
 153
 154         if (component->destroy) {
 155                 BT_LOGD_STR("Destroying type-specific data.");
 156                 component->destroy(component);
 157         }
 158
 159         if (component->input_ports) {
 160                 BT_LOGD_STR("Destroying input ports.");
 161                 g_ptr_array_free(component->input_ports, TRUE);
 162                 component->input_ports = NULL;
 163         }
 164
 165         if (component->output_ports) {
 166                 BT_LOGD_STR("Destroying output ports.");
 167                 g_ptr_array_free(component->output_ports, TRUE);
 168                 component->output_ports = NULL;
 169         }
 170
 171         if (component->destroy_listeners) {
 172                 g_array_free(component->destroy_listeners, TRUE);
 173                 component->destroy_listeners = NULL;
 174         }
 175
 176         if (component->name) {
 177                 g_string_free(component->name, TRUE);
 178                 component->name = NULL;
 179         }
 180
 181         BT_LOGD_STR("Putting component class.");
 182         BT_OBJECT_PUT_REF_AND_RESET(component->class);
 183         g_free(component);
 184 }
 185
 186 enum bt_component_class_type bt_component_get_class_type(
 187                 const struct bt_component *component)
 188 {
 189         BT_ASSERT_PRE_NON_NULL(component, "Component");
 190         return component->class->type;
 191 }
 192
 193 static
 194 struct bt_port *add_port(
 195                 struct bt_component *component, GPtrArray *ports,
 196                 enum bt_port_type port_type, const char *name, void *user_data)
 197 {
 198         struct bt_port *new_port = NULL;
 199         struct bt_graph *graph = NULL;
 200
 201         BT_ASSERT_PRE_NON_NULL(component, "Component");
 202         BT_ASSERT_PRE_NON_NULL(name, "Name");
 203         BT_ASSERT_PRE(strlen(name) > 0, "Name is empty");
 204         graph = bt_component_borrow_graph(component);
 205         BT_ASSERT_PRE(graph && !bt_graph_is_canceled(graph),
 206                 "Component's graph is canceled: %![comp-]+c, %![graph-]+g",
 207                 component, graph);
 208
 209         // TODO: Validate that the name is not already used.
 210
 211         BT_LIB_LOGD("Adding port to component: %![comp-]+c, "
 212                 "port-type=%s, port-name=\"%s\"", component,
 213                 bt_port_type_string(port_type), name);
 214
 215         new_port = bt_port_create(component, port_type, name, user_data);
 216         if (!new_port) {
 217                 BT_LOGE_STR("Cannot create port object.");
 218                 goto end;
 219         }
 220
 221         /*
 222          * No name clash, add the port.
 223          * The component is now the port's parent; it should _not_
 224          * hold a reference to the port since the port's lifetime
 225          * is now protected by the component's own lifetime.
 226          */
 227         g_ptr_array_add(ports, new_port);
 228
 229         /*
 230          * Notify the graph's creator that a new port was added.
 231          */
 232         bt_object_get_ref(bt_component_borrow_graph(component));
 233         graph = bt_component_borrow_graph(component);
 234         if (graph) {
 235                 bt_graph_notify_port_added(graph, new_port);
 236                 BT_OBJECT_PUT_REF_AND_RESET(graph);
 237         }
 238
 239         BT_LIB_LOGD("Created and added port to component: "
 240                 "%![comp-]+c, %![port-]+p", component, new_port);
 241
 242 end:
 243         return new_port;
 244 }
 245
 246 BT_HIDDEN
 247 uint64_t bt_component_get_input_port_count(const struct bt_component *comp)
 248 {
 249         BT_ASSERT_PRE_NON_NULL(comp, "Component");
 250         return (uint64_t) comp->input_ports->len;
 251 }
 252
 253 BT_HIDDEN
 254 uint64_t bt_component_get_output_port_count(const struct bt_component *comp)
 255 {
 256         BT_ASSERT_PRE_NON_NULL(comp, "Component");
 257         return (uint64_t) comp->output_ports->len;
 258 }
 259
 260 BT_HIDDEN
 261 int bt_component_create(struct bt_component_class *component_class,
 262                 const char *name, struct bt_component **user_component)
 263 {
 264         int ret = 0;
 265         struct bt_component *component = NULL;
 266         enum bt_component_class_type type;
 267
 268         BT_ASSERT(user_component);
 269         BT_ASSERT(component_class);
 270         BT_ASSERT(name);
 271
 272         type = bt_component_class_get_type(component_class);
 273         BT_LIB_LOGD("Creating empty component from component class: %![cc-]+C, "
 274                 "comp-name=\"%s\"", component_class, name);
 275         component = component_create_funcs[type](component_class);
 276         if (!component) {
 277                 BT_LOGE_STR("Cannot create specific component object.");
 278                 ret = -1;
 279                 goto end;
 280         }
 281
 282         bt_object_init_shared_with_parent(&component->base,
 283                 destroy_component);
 284         component->class = component_class;
 285         bt_object_get_no_null_check(component->class);
 286         component->destroy = component_destroy_funcs[type];
 287         component->name = g_string_new(name);
 288         if (!component->name) {
 289                 BT_LOGE_STR("Failed to allocate one GString.");
 290                 ret = -1;
 291                 goto end;
 292         }
 293
 294         component->input_ports = g_ptr_array_new_with_free_func(
 295                 (GDestroyNotify) bt_object_try_spec_release);
 296         if (!component->input_ports) {
 297                 BT_LOGE_STR("Failed to allocate one GPtrArray.");
 298                 ret = -1;
 299                 goto end;
 300         }
 301
 302         component->output_ports = g_ptr_array_new_with_free_func(
 303                 (GDestroyNotify) bt_object_try_spec_release);
 304         if (!component->output_ports) {
 305                 BT_LOGE_STR("Failed to allocate one GPtrArray.");
 306                 ret = -1;
 307                 goto end;
 308         }
 309
 310         component->destroy_listeners = g_array_new(FALSE, TRUE,
 311                 sizeof(struct bt_component_destroy_listener));
 312         if (!component->destroy_listeners) {
 313                 BT_LOGE_STR("Failed to allocate one GArray.");
 314                 ret = -1;
 315                 goto end;
 316         }
 317
 318         BT_LIB_LOGD("Created empty component from component class: "
 319                 "%![cc-]+C, %![comp-]+c", component_class, component);
 320         BT_OBJECT_MOVE_REF(*user_component, component);
 321
 322 end:
 323         bt_object_put_ref(component);
 324         return ret;
 325 }
 326
 327 const char *bt_component_get_name(const struct bt_component *component)
 328 {
 329         BT_ASSERT_PRE_NON_NULL(component, "Component");
 330         return component->name->str;
 331 }
 332
 333 struct bt_component_class *bt_component_borrow_class(
 334                 const struct bt_component *component)
 335 {
 336         BT_ASSERT_PRE_NON_NULL(component, "Component");
 337         return component->class;
 338 }
 339
 340 void *bt_self_component_get_data(const struct bt_self_component *self_comp)
 341 {
 342         struct bt_component *component = (void *) self_comp;
 343
 344         BT_ASSERT_PRE_NON_NULL(component, "Component");
 345         return component->user_data;
 346 }
 347
 348 void bt_self_component_set_data(struct bt_self_component *self_comp,
 349                 void *data)
 350 {
 351         struct bt_component *component = (void *) self_comp;
 352
 353         BT_ASSERT_PRE_NON_NULL(component, "Component");
 354         component->user_data = data;
 355         BT_LIB_LOGV("Set component's user data: %!+c", component);
 356 }
 357
 358 BT_HIDDEN
 359 void bt_component_set_graph(struct bt_component *component,
 360                 struct bt_graph *graph)
 361 {
 362         bt_object_set_parent(&component->base,
 363                 graph ? &graph->base : NULL);
 364 }
 365
 366 bt_bool bt_component_graph_is_canceled(const struct bt_component *component)
 367 {
 368         return bt_graph_is_canceled(
 369                 (void *) bt_object_borrow_parent(&component->base));
 370 }
 371
 372 static
 373 struct bt_port *borrow_port_by_name(GPtrArray *ports,
 374                 const char *name)
 375 {
 376         uint64_t i;
 377         struct bt_port *ret_port = NULL;
 378
 379         BT_ASSERT(name);
 380
 381         for (i = 0; i < ports->len; i++) {
 382                 struct bt_port *port = g_ptr_array_index(ports, i);
 383
 384                 if (!strcmp(name, port->name->str)) {
 385                         ret_port = port;
 386                         break;
 387                 }
 388         }
 389
 390         return ret_port;
 391 }
 392
 393 BT_HIDDEN
 394 struct bt_port_input *bt_component_borrow_input_port_by_name(
 395                 struct bt_component *comp, const char *name)
 396 {
 397         BT_ASSERT(comp);
 398         return (void *) borrow_port_by_name(comp->input_ports, name);
 399 }
 400
 401 BT_HIDDEN
 402 struct bt_port_output *bt_component_borrow_output_port_by_name(
 403                 struct bt_component *comp, const char *name)
 404 {
 405         BT_ASSERT_PRE_NON_NULL(comp, "Component");
 406         return (void *)
 407                 borrow_port_by_name(comp->output_ports, name);
 408 }
 409
 410 static
 411 struct bt_port *borrow_port_by_index(GPtrArray *ports, uint64_t index)
 412 {
 413         BT_ASSERT(index < ports->len);
 414         return g_ptr_array_index(ports, index);
 415 }
 416
 417 BT_HIDDEN
 418 struct bt_port_input *bt_component_borrow_input_port_by_index(
 419                 struct bt_component *comp, uint64_t index)
 420 {
 421         BT_ASSERT_PRE_NON_NULL(comp, "Component");
 422         BT_ASSERT_PRE_VALID_INDEX(index, comp->input_ports->len);
 423         return (void *)
 424                 borrow_port_by_index(comp->input_ports, index);
 425 }
 426
 427 BT_HIDDEN
 428 struct bt_port_output *bt_component_borrow_output_port_by_index(
 429                 struct bt_component *comp, uint64_t index)
 430 {
 431         BT_ASSERT_PRE_NON_NULL(comp, "Component");
 432         BT_ASSERT_PRE_VALID_INDEX(index, comp->output_ports->len);
 433         return (void *)
 434                 borrow_port_by_index(comp->output_ports, index);
 435 }
 436
 437 BT_HIDDEN
 438 struct bt_port_input *bt_component_add_input_port(
 439                 struct bt_component *component, const char *name,
 440                 void *user_data)
 441 {
 442         /* add_port() logs details */
 443         return (void *)
 444                 add_port(component, component->input_ports,
 445                         BT_PORT_TYPE_INPUT, name, user_data);
 446 }
 447
 448 BT_HIDDEN
 449 struct bt_port_output *bt_component_add_output_port(
 450                 struct bt_component *component, const char *name,
 451                 void *user_data)
 452 {
 453         /* add_port() logs details */
 454         return (void *)
 455                 add_port(component, component->output_ports,
 456                         BT_PORT_TYPE_OUTPUT, name, user_data);
 457 }
 458
 459 static
 460 void remove_port_by_index(struct bt_component *component,
 461                 GPtrArray *ports, uint64_t index)
 462 {
 463         struct bt_port *port;
 464         struct bt_graph *graph;
 465
 466         BT_ASSERT(ports);
 467         BT_ASSERT(index < ports->len);
 468         port = g_ptr_array_index(ports, index);
 469         BT_LIB_LOGD("Removing port from component: %![comp-]+c, %![port-]+p",
 470                 component, port);
 471
 472         /* Disconnect both ports of this port's connection, if any */
 473         if (port->connection) {
 474                 bt_connection_end(port->connection, true);
 475         }
 476
 477         /*
 478          * The port's current reference count can be 0 at this point,
 479          * which means its parent (component) keeps it alive. We are
 480          * about to remove the port from its parent's container (with
 481          * the g_ptr_array_remove_index() call below), which in this
 482          * case would destroy it. This is not good because we still
 483          * need the port for the bt_graph_notify_port_removed() call
 484          * below (in which its component is `NULL` as expected because
 485          * of the bt_object_set_parent() call below).
 486          *
 487          * To avoid a destroyed port during the notification callback,
 488          * get a reference now, and put it (destroying the port if its
 489          * reference count is 0 at this point) after notifying the
 490          * graph's user.
 491          */
 492         bt_object_get_no_null_check(&port->base);
 493
 494         /*
 495          * Remove from parent's array of ports (weak refs). This never
 496          * destroys the port object because its reference count is at
 497          * least 1 thanks to the bt_object_get_no_null_check() call
 498          * above.
 499          */
 500         g_ptr_array_remove_index(ports, index);
 501
 502         /* Detach port from its component parent */
 503         bt_object_set_parent(&port->base, NULL);
 504
 505         /*
 506          * Notify the graph's creator that a port is removed.
 507          */
 508         graph = bt_component_borrow_graph(component);
 509         if (graph) {
 510                 bt_graph_notify_port_removed(graph, component, port);
 511         }
 512
 513         BT_LIB_LOGD("Removed port from component: %![comp-]+c, %![port-]+p",
 514                 component, port);
 515
 516         /*
 517          * Put the local reference. If this port's reference count was 0
 518          * when entering this function, it is 1 now, so it is destroyed
 519          * immediately.
 520          */
 521         bt_object_put_no_null_check(&port->base);
 522 }
 523
 524 BT_HIDDEN
 525 void bt_component_remove_port(struct bt_component *component,
 526                 struct bt_port *port)
 527 {
 528         uint64_t i;
 529         GPtrArray *ports = NULL;
 530
 531         BT_ASSERT(component);
 532         BT_ASSERT(port);
 533
 534         switch (port->type) {
 535         case BT_PORT_TYPE_INPUT:
 536                 ports = component->input_ports;
 537                 break;
 538         case BT_PORT_TYPE_OUTPUT:
 539                 ports = component->output_ports;
 540                 break;
 541         default:
 542                 abort();
 543         }
 544
 545         BT_ASSERT(ports);
 546
 547         for (i = 0; i < ports->len; i++) {
 548                 struct bt_port *cur_port = g_ptr_array_index(ports, i);
 549
 550                 if (cur_port == port) {
 551                         remove_port_by_index(component,
 552                                 ports, i);
 553                         goto end;
 554                 }
 555         }
 556
 557         BT_LIB_LOGW("Port to remove from component was not found: "
 558                 "%![comp-]+c, %![port-]+p", component, port);
 559
 560 end:
 561         return;
 562 }
 563
 564 BT_HIDDEN
 565 enum bt_self_component_status bt_component_accept_port_connection(
 566                 struct bt_component *comp, struct bt_port *self_port,
 567                 struct bt_port *other_port)
 568 {
 569         typedef enum bt_self_component_status (*method_t)(
 570                 void *, void *, const void *);
 571
 572         enum bt_self_component_status status = BT_SELF_COMPONENT_STATUS_OK;
 573         method_t method = NULL;
 574
 575         BT_ASSERT(comp);
 576         BT_ASSERT(self_port);
 577         BT_ASSERT(other_port);
 578
 579         switch (comp->class->type) {
 580         case BT_COMPONENT_CLASS_TYPE_SOURCE:
 581         {
 582                 struct bt_component_class_source *src_cc = (void *) comp->class;
 583
 584                 switch (self_port->type) {
 585                 case BT_PORT_TYPE_OUTPUT:
 586                         method = (method_t) src_cc->methods.accept_output_port_connection;
 587                         break;
 588                 default:
 589                         abort();
 590                 }
 591
 592                 break;
 593         }
 594         case BT_COMPONENT_CLASS_TYPE_FILTER:
 595         {
 596                 struct bt_component_class_filter *flt_cc = (void *) comp->class;
 597
 598                 switch (self_port->type) {
 599                 case BT_PORT_TYPE_INPUT:
 600                         method = (method_t) flt_cc->methods.accept_input_port_connection;
 601                         break;
 602                 case BT_PORT_TYPE_OUTPUT:
 603                         method = (method_t) flt_cc->methods.accept_output_port_connection;
 604                         break;
 605                 default:
 606                         abort();
 607                 }
 608
 609                 break;
 610         }
 611         case BT_COMPONENT_CLASS_TYPE_SINK:
 612         {
 613                 struct bt_component_class_sink *sink_cc = (void *) comp->class;
 614
 615                 switch (self_port->type) {
 616                 case BT_PORT_TYPE_INPUT:
 617                         method = (method_t) sink_cc->methods.accept_input_port_connection;
 618                         break;
 619                 default:
 620                         abort();
 621                 }
 622
 623                 break;
 624         }
 625         default:
 626                 abort();
 627         }
 628
 629         if (method) {
 630                 BT_LIB_LOGD("Calling user's \"accept port connection\" method: "
 631                         "%![comp-]+c, %![self-port-]+p, %![other-port-]+p",
 632                         comp, self_port, other_port);
 633                 status = method(comp, self_port, (void *) other_port);
 634                 BT_LOGD("User method returned: status=%s",
 635                         bt_self_component_status_string(status));
 636         }
 637
 638         return status;
 639 }
 640
 641 BT_HIDDEN
 642 enum bt_self_component_status bt_component_port_connected(
 643                 struct bt_component *comp, struct bt_port *self_port,
 644                 struct bt_port *other_port)
 645 {
 646         typedef enum bt_self_component_status (*method_t)(
 647                 void *, void *, const void *);
 648
 649         enum bt_self_component_status status = BT_SELF_COMPONENT_STATUS_OK;
 650         method_t method = NULL;
 651
 652         BT_ASSERT(comp);
 653         BT_ASSERT(self_port);
 654         BT_ASSERT(other_port);
 655
 656         switch (comp->class->type) {
 657         case BT_COMPONENT_CLASS_TYPE_SOURCE:
 658         {
 659                 struct bt_component_class_source *src_cc = (void *) comp->class;
 660
 661                 switch (self_port->type) {
 662                 case BT_PORT_TYPE_OUTPUT:
 663                         method = (method_t) src_cc->methods.output_port_connected;
 664                         break;
 665                 default:
 666                         abort();
 667                 }
 668
 669                 break;
 670         }
 671         case BT_COMPONENT_CLASS_TYPE_FILTER:
 672         {
 673                 struct bt_component_class_filter *flt_cc = (void *) comp->class;
 674
 675                 switch (self_port->type) {
 676                 case BT_PORT_TYPE_INPUT:
 677                         method = (method_t) flt_cc->methods.input_port_connected;
 678                         break;
 679                 case BT_PORT_TYPE_OUTPUT:
 680                         method = (method_t) flt_cc->methods.output_port_connected;
 681                         break;
 682                 default:
 683                         abort();
 684                 }
 685
 686                 break;
 687         }
 688         case BT_COMPONENT_CLASS_TYPE_SINK:
 689         {
 690                 struct bt_component_class_sink *sink_cc = (void *) comp->class;
 691
 692                 switch (self_port->type) {
 693                 case BT_PORT_TYPE_INPUT:
 694                         method = (method_t) sink_cc->methods.input_port_connected;
 695                         break;
 696                 default:
 697                         abort();
 698                 }
 699
 700                 break;
 701         }
 702         default:
 703                 abort();
 704         }
 705
 706         if (method) {
 707                 BT_LIB_LOGD("Calling user's \"port connected\" method: "
 708                         "%![comp-]+c, %![self-port-]+p, %![other-port-]+p",
 709                         comp, self_port, other_port);
 710                 status = method(comp, self_port, (void *) other_port);
 711                 BT_LOGD("User method returned: status=%s",
 712                         bt_self_component_status_string(status));
 713         }
 714
 715         return status;
 716 }
 717
 718 BT_HIDDEN
 719 void bt_component_port_disconnected(struct bt_component *comp,
 720                 struct bt_port *port)
 721 {
 722         typedef void (*method_t)(void *, void *);
 723
 724         method_t method = NULL;
 725
 726         BT_ASSERT(comp);
 727         BT_ASSERT(port);
 728
 729         switch (comp->class->type) {
 730         case BT_COMPONENT_CLASS_TYPE_SOURCE:
 731         {
 732                 struct bt_component_class_source *src_cc = (void *) comp->class;
 733
 734                 switch (port->type) {
 735                 case BT_PORT_TYPE_OUTPUT:
 736                         method = (method_t) src_cc->methods.output_port_disconnected;
 737                         break;
 738                 default:
 739                         abort();
 740                 }
 741
 742                 break;
 743         }
 744         case BT_COMPONENT_CLASS_TYPE_FILTER:
 745         {
 746                 struct bt_component_class_filter *flt_cc = (void *) comp->class;
 747
 748                 switch (port->type) {
 749                 case BT_PORT_TYPE_INPUT:
 750                         method = (method_t) flt_cc->methods.input_port_disconnected;
 751                         break;
 752                 case BT_PORT_TYPE_OUTPUT:
 753                         method = (method_t) flt_cc->methods.output_port_disconnected;
 754                         break;
 755                 default:
 756                         abort();
 757                 }
 758
 759                 break;
 760         }
 761         case BT_COMPONENT_CLASS_TYPE_SINK:
 762         {
 763                 struct bt_component_class_sink *sink_cc = (void *) comp->class;
 764
 765                 switch (port->type) {
 766                 case BT_PORT_TYPE_INPUT:
 767                         method = (method_t) sink_cc->methods.input_port_disconnected;
 768                         break;
 769                 default:
 770                         abort();
 771                 }
 772
 773                 break;
 774         }
 775         default:
 776                 abort();
 777         }
 778
 779         if (method) {
 780                 BT_LIB_LOGD("Calling user's \"port disconnected\" method: "
 781                         "%![comp-]+c, %![port-]+p", comp, port);
 782                 method(comp, port);
 783         }
 784 }
 785
 786 BT_HIDDEN
 787 void bt_component_add_destroy_listener(struct bt_component *component,
 788                 bt_component_destroy_listener_func func, void *data)
 789 {
 790         struct bt_component_destroy_listener listener;
 791
 792         BT_ASSERT(component);
 793         BT_ASSERT(func);
 794         listener.func = func;
 795         listener.data = data;
 796         g_array_append_val(component->destroy_listeners, listener);
 797         BT_LIB_LOGV("Added destroy listener: %![comp-]+c, "
 798                 "func-addr=%p, data-addr=%p",
 799                 component, func, data);
 800 }
 801
 802 BT_HIDDEN
 803 void bt_component_remove_destroy_listener(struct bt_component *component,
 804                 bt_component_destroy_listener_func func, void *data)
 805 {
 806         uint64_t i;
 807
 808         BT_ASSERT(component);
 809         BT_ASSERT(func);
 810
 811         for (i = 0; i < component->destroy_listeners->len; i++) {
 812                 struct bt_component_destroy_listener *listener =
 813                         &g_array_index(component->destroy_listeners,
 814                                 struct bt_component_destroy_listener, i);
 815
 816                 if (listener->func == func && listener->data == data) {
 817                         g_array_remove_index(component->destroy_listeners, i);
 818                         i--;
 819                         BT_LIB_LOGV("Removed destroy listener: %![comp-]+c, "
 820                                 "func-addr=%p, data-addr=%p",
 821                                 component, func, data);
 822                 }
 823         }
 824 }