lib/graph/component.c

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