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/assert-internal.h>
  28 #include <babeltrace/assert-pre-internal.h>
  29 #include <babeltrace/graph/self-component.h>
  30 #include <babeltrace/graph/component-const.h>
  31 #include <babeltrace/graph/component-source-const.h>
  32 #include <babeltrace/graph/component-filter-const.h>
  33 #include <babeltrace/graph/component-sink-const.h>
  34 #include <babeltrace/graph/component-internal.h>
  35 #include <babeltrace/graph/component-class-internal.h>
  36 #include <babeltrace/graph/component-source-internal.h>
  37 #include <babeltrace/graph/component-filter-internal.h>
  38 #include <babeltrace/graph/component-sink-internal.h>
  39 #include <babeltrace/graph/connection-internal.h>
  40 #include <babeltrace/graph/graph-internal.h>
  41 #include <babeltrace/graph/message-iterator-internal.h>
  42 #include <babeltrace/graph/port-internal.h>
  43 #include <babeltrace/babeltrace-internal.h>
  44 #include <babeltrace/compiler-internal.h>
  45 #include <babeltrace/types.h>
  46 #include <babeltrace/value.h>
  47 #include <babeltrace/value-internal.h>
  48 #include <stdint.h>
  49 #include <inttypes.h>
  50
  51 static
  52 struct bt_component * (* const component_create_funcs[])(
  53                 const struct bt_component_class *) = {
  54         [BT_COMPONENT_CLASS_TYPE_SOURCE] = bt_component_source_create,
  55         [BT_COMPONENT_CLASS_TYPE_SINK] = bt_component_sink_create,
  56         [BT_COMPONENT_CLASS_TYPE_FILTER] = bt_component_filter_create,
  57 };
  58
  59 static
  60 void (*component_destroy_funcs[])(struct bt_component *) = {
  61         [BT_COMPONENT_CLASS_TYPE_SOURCE] = bt_component_source_destroy,
  62         [BT_COMPONENT_CLASS_TYPE_SINK] = bt_component_sink_destroy,
  63         [BT_COMPONENT_CLASS_TYPE_FILTER] = bt_component_filter_destroy,
  64 };
  65
  66 static
  67 void finalize_component(struct bt_component *comp)
  68 {
  69         typedef void (*method_t)(void *);
  70
  71         method_t method = NULL;
  72
  73         BT_ASSERT(comp);
  74
  75         switch (comp->class->type) {
  76         case BT_COMPONENT_CLASS_TYPE_SOURCE:
  77         {
  78                 struct bt_component_class_source *src_cc = (void *) comp->class;
  79
  80                 method = (method_t) src_cc->methods.finalize;
  81                 break;
  82         }
  83         case BT_COMPONENT_CLASS_TYPE_FILTER:
  84         {
  85                 struct bt_component_class_filter *flt_cc = (void *) comp->class;
  86
  87                 method = (method_t) flt_cc->methods.finalize;
  88                 break;
  89         }
  90         case BT_COMPONENT_CLASS_TYPE_SINK:
  91         {
  92                 struct bt_component_class_sink *sink_cc = (void *) comp->class;
  93
  94                 method = (method_t) sink_cc->methods.finalize;
  95                 break;
  96         }
  97         default:
  98                 abort();
  99         }
 100
 101         if (method) {
 102                 BT_LIB_LOGD("Calling user's finalization method: "
 103                         "%![comp-]+c", comp);
 104                 method(comp);
 105         }
 106 }
 107
 108 static
 109 void destroy_component(struct bt_object *obj)
 110 {
 111         struct bt_component *component = NULL;
 112         int i;
 113
 114         if (!obj) {
 115                 return;
 116         }
 117
 118         /*
 119          * The component's reference count is 0 if we're here. Increment
 120          * it to avoid a double-destroy (possibly infinitely recursive).
 121          * This could happen for example if the component's finalization
 122          * function does bt_object_get_ref() (or anything that causes
 123          * bt_object_get_ref() to be called) on itself (ref. count goes
 124          * from 0 to 1), and then bt_object_put_ref(): the reference
 125          * count would go from 1 to 0 again and this function would be
 126          * called again.
 127          */
 128         obj->ref_count++;
 129         component = container_of(obj, struct bt_component, base);
 130         BT_LIB_LOGD("Destroying component: %![comp-]+c, %![graph-]+g",
 131                 component, bt_component_borrow_graph(component));
 132
 133         /* Call destroy listeners in reverse registration order */
 134         BT_LOGD_STR("Calling destroy listeners.");
 135
 136         for (i = component->destroy_listeners->len - 1; i >= 0; i--) {
 137                 struct bt_component_destroy_listener *listener =
 138                         &g_array_index(component->destroy_listeners,
 139                                 struct bt_component_destroy_listener, i);
 140
 141                 listener->func(component, listener->data);
 142         }
 143
 144         /*
 145          * User data is destroyed first, followed by the concrete
 146          * component instance. Do not finalize if the component's user
 147          * initialization method failed in the first place.
 148          */
 149         if (component->initialized) {
 150                 finalize_component(component);
 151         }
 152
 153         if (component->destroy) {
 154                 BT_LOGD_STR("Destroying type-specific data.");
 155                 component->destroy(component);
 156         }
 157
 158         if (component->input_ports) {
 159                 BT_LOGD_STR("Destroying input ports.");
 160                 g_ptr_array_free(component->input_ports, TRUE);
 161                 component->input_ports = NULL;
 162         }
 163
 164         if (component->output_ports) {
 165                 BT_LOGD_STR("Destroying output ports.");
 166                 g_ptr_array_free(component->output_ports, TRUE);
 167                 component->output_ports = NULL;
 168         }
 169
 170         if (component->destroy_listeners) {
 171                 g_array_free(component->destroy_listeners, TRUE);
 172                 component->destroy_listeners = NULL;
 173         }
 174
 175         if (component->name) {
 176                 g_string_free(component->name, TRUE);
 177                 component->name = NULL;
 178         }
 179
 180         BT_LOGD_STR("Putting component class.");
 181         BT_OBJECT_PUT_REF_AND_RESET(component->class);
 182         g_free(component);
 183 }
 184
 185 enum bt_component_class_type bt_component_get_class_type(
 186                 const struct bt_component *component)
 187 {
 188         BT_ASSERT_PRE_NON_NULL(component, "Component");
 189         return component->class->type;
 190 }
 191
 192 static
 193 struct bt_port *add_port(
 194                 struct bt_component *component, GPtrArray *ports,
 195                 enum bt_port_type port_type, const char *name, void *user_data)
 196 {
 197         struct bt_port *new_port = NULL;
 198         struct bt_graph *graph = NULL;
 199
 200         BT_ASSERT_PRE_NON_NULL(component, "Component");
 201         BT_ASSERT_PRE_NON_NULL(name, "Name");
 202         BT_ASSERT_PRE(strlen(name) > 0, "Name is empty");
 203         graph = bt_component_borrow_graph(component);
 204         BT_ASSERT_PRE(graph && !bt_graph_is_canceled(graph),
 205                 "Component's graph is canceled: %![comp-]+c, %![graph-]+g",
 206                 component, graph);
 207
 208         // TODO: Validate that the name is not already used.
 209
 210         BT_LIB_LOGD("Adding port to component: %![comp-]+c, "
 211                 "port-type=%s, port-name=\"%s\"", component,
 212                 bt_port_type_string(port_type), name);
 213
 214         new_port = bt_port_create(component, port_type, name, user_data);
 215         if (!new_port) {
 216                 BT_LOGE_STR("Cannot create port object.");
 217                 goto end;
 218         }
 219
 220         /*
 221          * No name clash, add the port.
 222          * The component is now the port's parent; it should _not_
 223          * hold a reference to the port since the port's lifetime
 224          * is now protected by the component's own lifetime.
 225          */
 226         g_ptr_array_add(ports, new_port);
 227
 228         /*
 229          * Notify the graph's creator that a new port was added.
 230          */
 231         bt_object_get_ref(bt_component_borrow_graph(component));
 232         graph = bt_component_borrow_graph(component);
 233         if (graph) {
 234                 bt_graph_notify_port_added(graph, new_port);
 235                 BT_OBJECT_PUT_REF_AND_RESET(graph);
 236         }
 237
 238         BT_LIB_LOGD("Created and added port to component: "
 239                 "%![comp-]+c, %![port-]+p", component, new_port);
 240
 241 end:
 242         return new_port;
 243 }
 244
 245 BT_HIDDEN
 246 uint64_t bt_component_get_input_port_count(const struct bt_component *comp)
 247 {
 248         BT_ASSERT_PRE_NON_NULL(comp, "Component");
 249         return (uint64_t) comp->input_ports->len;
 250 }
 251
 252 BT_HIDDEN
 253 uint64_t bt_component_get_output_port_count(const struct bt_component *comp)
 254 {
 255         BT_ASSERT_PRE_NON_NULL(comp, "Component");
 256         return (uint64_t) comp->output_ports->len;
 257 }
 258
 259 BT_HIDDEN
 260 int bt_component_create(struct bt_component_class *component_class,
 261                 const char *name, struct bt_component **user_component)
 262 {
 263         int ret = 0;
 264         struct bt_component *component = NULL;
 265         enum bt_component_class_type type;
 266
 267         BT_ASSERT(user_component);
 268         BT_ASSERT(component_class);
 269         BT_ASSERT(name);
 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, destroy_component);
 281         component->class = component_class;
 282         bt_object_get_no_null_check(component->class);
 283         component->destroy = component_destroy_funcs[type];
 284         component->name = g_string_new(name);
 285         if (!component->name) {
 286                 BT_LOGE_STR("Failed to allocate one GString.");
 287                 ret = -1;
 288                 goto end;
 289         }
 290
 291         component->input_ports = g_ptr_array_new_with_free_func(
 292                 (GDestroyNotify) bt_object_try_spec_release);
 293         if (!component->input_ports) {
 294                 BT_LOGE_STR("Failed to allocate one GPtrArray.");
 295                 ret = -1;
 296                 goto end;
 297         }
 298
 299         component->output_ports = g_ptr_array_new_with_free_func(
 300                 (GDestroyNotify) bt_object_try_spec_release);
 301         if (!component->output_ports) {
 302                 BT_LOGE_STR("Failed to allocate one GPtrArray.");
 303                 ret = -1;
 304                 goto end;
 305         }
 306
 307         component->destroy_listeners = g_array_new(FALSE, TRUE,
 308                 sizeof(struct bt_component_destroy_listener));
 309         if (!component->destroy_listeners) {
 310                 BT_LOGE_STR("Failed to allocate one GArray.");
 311                 ret = -1;
 312                 goto end;
 313         }
 314
 315         BT_LIB_LOGD("Created empty component from component class: "
 316                 "%![cc-]+C, %![comp-]+c", component_class, component);
 317         BT_OBJECT_MOVE_REF(*user_component, component);
 318
 319 end:
 320         bt_object_put_ref(component);
 321         return ret;
 322 }
 323
 324 const char *bt_component_get_name(const struct bt_component *component)
 325 {
 326         BT_ASSERT_PRE_NON_NULL(component, "Component");
 327         return component->name->str;
 328 }
 329
 330 struct bt_component_class *bt_component_borrow_class(
 331                 const struct bt_component *component)
 332 {
 333         BT_ASSERT_PRE_NON_NULL(component, "Component");
 334         return component->class;
 335 }
 336
 337 void *bt_self_component_get_data(const struct bt_self_component *self_comp)
 338 {
 339         struct bt_component *component = (void *) self_comp;
 340
 341         BT_ASSERT_PRE_NON_NULL(component, "Component");
 342         return component->user_data;
 343 }
 344
 345 void bt_self_component_set_data(struct bt_self_component *self_comp,
 346                 void *data)
 347 {
 348         struct bt_component *component = (void *) self_comp;
 349
 350         BT_ASSERT_PRE_NON_NULL(component, "Component");
 351         component->user_data = data;
 352         BT_LIB_LOGV("Set component's user data: %!+c", component);
 353 }
 354
 355 BT_HIDDEN
 356 void bt_component_set_graph(struct bt_component *component,
 357                 struct bt_graph *graph)
 358 {
 359         bt_object_set_parent(&component->base,
 360                 graph ? &graph->base : NULL);
 361 }
 362
 363 bt_bool bt_component_graph_is_canceled(const struct bt_component *component)
 364 {
 365         return bt_graph_is_canceled(
 366                 (void *) bt_object_borrow_parent(&component->base));
 367 }
 368
 369 static
 370 struct bt_port *borrow_port_by_name(GPtrArray *ports,
 371                 const char *name)
 372 {
 373         uint64_t i;
 374         struct bt_port *ret_port = NULL;
 375
 376         BT_ASSERT(name);
 377
 378         for (i = 0; i < ports->len; i++) {
 379                 struct bt_port *port = g_ptr_array_index(ports, i);
 380
 381                 if (!strcmp(name, port->name->str)) {
 382                         ret_port = port;
 383                         break;
 384                 }
 385         }
 386
 387         return ret_port;
 388 }
 389
 390 BT_HIDDEN
 391 struct bt_port_input *bt_component_borrow_input_port_by_name(
 392                 struct bt_component *comp, const char *name)
 393 {
 394         BT_ASSERT(comp);
 395         return (void *) borrow_port_by_name(comp->input_ports, name);
 396 }
 397
 398 BT_HIDDEN
 399 struct bt_port_output *bt_component_borrow_output_port_by_name(
 400                 struct bt_component *comp, const char *name)
 401 {
 402         BT_ASSERT_PRE_NON_NULL(comp, "Component");
 403         return (void *)
 404                 borrow_port_by_name(comp->output_ports, name);
 405 }
 406
 407 static
 408 struct bt_port *borrow_port_by_index(GPtrArray *ports, uint64_t index)
 409 {
 410         BT_ASSERT(index < ports->len);
 411         return g_ptr_array_index(ports, index);
 412 }
 413
 414 BT_HIDDEN
 415 struct bt_port_input *bt_component_borrow_input_port_by_index(
 416                 struct bt_component *comp, uint64_t index)
 417 {
 418         BT_ASSERT_PRE_NON_NULL(comp, "Component");
 419         BT_ASSERT_PRE_VALID_INDEX(index, comp->input_ports->len);
 420         return (void *)
 421                 borrow_port_by_index(comp->input_ports, index);
 422 }
 423
 424 BT_HIDDEN
 425 struct bt_port_output *bt_component_borrow_output_port_by_index(
 426                 struct bt_component *comp, uint64_t index)
 427 {
 428         BT_ASSERT_PRE_NON_NULL(comp, "Component");
 429         BT_ASSERT_PRE_VALID_INDEX(index, comp->output_ports->len);
 430         return (void *)
 431                 borrow_port_by_index(comp->output_ports, index);
 432 }
 433
 434 BT_HIDDEN
 435 struct bt_port_input *bt_component_add_input_port(
 436                 struct bt_component *component, const char *name,
 437                 void *user_data)
 438 {
 439         /* add_port() logs details */
 440         return (void *)
 441                 add_port(component, component->input_ports,
 442                         BT_PORT_TYPE_INPUT, name, user_data);
 443 }
 444
 445 BT_HIDDEN
 446 struct bt_port_output *bt_component_add_output_port(
 447                 struct bt_component *component, const char *name,
 448                 void *user_data)
 449 {
 450         /* add_port() logs details */
 451         return (void *)
 452                 add_port(component, component->output_ports,
 453                         BT_PORT_TYPE_OUTPUT, name, user_data);
 454 }
 455
 456 static
 457 void remove_port_by_index(struct bt_component *component,
 458                 GPtrArray *ports, uint64_t index)
 459 {
 460         struct bt_port *port;
 461         struct bt_graph *graph;
 462
 463         BT_ASSERT(ports);
 464         BT_ASSERT(index < ports->len);
 465         port = g_ptr_array_index(ports, index);
 466         BT_LIB_LOGD("Removing port from component: %![comp-]+c, %![port-]+p",
 467                 component, port);
 468
 469         /* Disconnect both ports of this port's connection, if any */
 470         if (port->connection) {
 471                 bt_connection_end(port->connection, true);
 472         }
 473
 474         /*
 475          * The port's current reference count can be 0 at this point,
 476          * which means its parent (component) keeps it alive. We are
 477          * about to remove the port from its parent's container (with
 478          * the g_ptr_array_remove_index() call below), which in this
 479          * case would destroy it. This is not good because we still
 480          * need the port for the bt_graph_notify_port_removed() call
 481          * below (in which its component is `NULL` as expected because
 482          * of the bt_object_set_parent() call below).
 483          *
 484          * To avoid a destroyed port during the message callback,
 485          * get a reference now, and put it (destroying the port if its
 486          * reference count is 0 at this point) after notifying the
 487          * graph's user.
 488          */
 489         bt_object_get_no_null_check(&port->base);
 490
 491         /*
 492          * Remove from parent's array of ports (weak refs). This never
 493          * destroys the port object because its reference count is at
 494          * least 1 thanks to the bt_object_get_no_null_check() call
 495          * above.
 496          */
 497         g_ptr_array_remove_index(ports, index);
 498
 499         /* Detach port from its component parent */
 500         bt_object_set_parent(&port->base, NULL);
 501
 502         /*
 503          * Notify the graph's creator that a port is removed.
 504          */
 505         graph = bt_component_borrow_graph(component);
 506         if (graph) {
 507                 bt_graph_notify_port_removed(graph, component, port);
 508         }
 509
 510         BT_LIB_LOGD("Removed port from component: %![comp-]+c, %![port-]+p",
 511                 component, port);
 512
 513         /*
 514          * Put the local reference. If this port's reference count was 0
 515          * when entering this function, it is 1 now, so it is destroyed
 516          * immediately.
 517          */
 518         bt_object_put_no_null_check(&port->base);
 519 }
 520
 521 BT_HIDDEN
 522 void bt_component_remove_port(struct bt_component *component,
 523                 struct bt_port *port)
 524 {
 525         uint64_t i;
 526         GPtrArray *ports = NULL;
 527
 528         BT_ASSERT(component);
 529         BT_ASSERT(port);
 530
 531         switch (port->type) {
 532         case BT_PORT_TYPE_INPUT:
 533                 ports = component->input_ports;
 534                 break;
 535         case BT_PORT_TYPE_OUTPUT:
 536                 ports = component->output_ports;
 537                 break;
 538         default:
 539                 abort();
 540         }
 541
 542         BT_ASSERT(ports);
 543
 544         for (i = 0; i < ports->len; i++) {
 545                 struct bt_port *cur_port = g_ptr_array_index(ports, i);
 546
 547                 if (cur_port == port) {
 548                         remove_port_by_index(component, ports, i);
 549                         goto end;
 550                 }
 551         }
 552
 553         BT_LIB_LOGW("Port to remove from component was not found: "
 554                 "%![comp-]+c, %![port-]+p", component, port);
 555
 556 end:
 557         return;
 558 }
 559
 560 BT_HIDDEN
 561 enum bt_self_component_status bt_component_accept_port_connection(
 562                 struct bt_component *comp, struct bt_port *self_port,
 563                 struct bt_port *other_port)
 564 {
 565         typedef enum bt_self_component_status (*method_t)(
 566                 void *, void *, const void *);
 567
 568         enum bt_self_component_status status = BT_SELF_COMPONENT_STATUS_OK;
 569         method_t method = NULL;
 570
 571         BT_ASSERT(comp);
 572         BT_ASSERT(self_port);
 573         BT_ASSERT(other_port);
 574
 575         switch (comp->class->type) {
 576         case BT_COMPONENT_CLASS_TYPE_SOURCE:
 577         {
 578                 struct bt_component_class_source *src_cc = (void *) comp->class;
 579
 580                 switch (self_port->type) {
 581                 case BT_PORT_TYPE_OUTPUT:
 582                         method = (method_t) src_cc->methods.accept_output_port_connection;
 583                         break;
 584                 default:
 585                         abort();
 586                 }
 587
 588                 break;
 589         }
 590         case BT_COMPONENT_CLASS_TYPE_FILTER:
 591         {
 592                 struct bt_component_class_filter *flt_cc = (void *) comp->class;
 593
 594                 switch (self_port->type) {
 595                 case BT_PORT_TYPE_INPUT:
 596                         method = (method_t) flt_cc->methods.accept_input_port_connection;
 597                         break;
 598                 case BT_PORT_TYPE_OUTPUT:
 599                         method = (method_t) flt_cc->methods.accept_output_port_connection;
 600                         break;
 601                 default:
 602                         abort();
 603                 }
 604
 605                 break;
 606         }
 607         case BT_COMPONENT_CLASS_TYPE_SINK:
 608         {
 609                 struct bt_component_class_sink *sink_cc = (void *) comp->class;
 610
 611                 switch (self_port->type) {
 612                 case BT_PORT_TYPE_INPUT:
 613                         method = (method_t) sink_cc->methods.accept_input_port_connection;
 614                         break;
 615                 default:
 616                         abort();
 617                 }
 618
 619                 break;
 620         }
 621         default:
 622                 abort();
 623         }
 624
 625         if (method) {
 626                 BT_LIB_LOGD("Calling user's \"accept port connection\" method: "
 627                         "%![comp-]+c, %![self-port-]+p, %![other-port-]+p",
 628                         comp, self_port, other_port);
 629                 status = method(comp, self_port, (void *) other_port);
 630                 BT_LOGD("User method returned: status=%s",
 631                         bt_self_component_status_string(status));
 632         }
 633
 634         return status;
 635 }
 636
 637 BT_HIDDEN
 638 enum bt_self_component_status bt_component_port_connected(
 639                 struct bt_component *comp, struct bt_port *self_port,
 640                 struct bt_port *other_port)
 641 {
 642         typedef enum bt_self_component_status (*method_t)(
 643                 void *, void *, const void *);
 644
 645         enum bt_self_component_status status = BT_SELF_COMPONENT_STATUS_OK;
 646         method_t method = NULL;
 647
 648         BT_ASSERT(comp);
 649         BT_ASSERT(self_port);
 650         BT_ASSERT(other_port);
 651
 652         switch (comp->class->type) {
 653         case BT_COMPONENT_CLASS_TYPE_SOURCE:
 654         {
 655                 struct bt_component_class_source *src_cc = (void *) comp->class;
 656
 657                 switch (self_port->type) {
 658                 case BT_PORT_TYPE_OUTPUT:
 659                         method = (method_t) src_cc->methods.output_port_connected;
 660                         break;
 661                 default:
 662                         abort();
 663                 }
 664
 665                 break;
 666         }
 667         case BT_COMPONENT_CLASS_TYPE_FILTER:
 668         {
 669                 struct bt_component_class_filter *flt_cc = (void *) comp->class;
 670
 671                 switch (self_port->type) {
 672                 case BT_PORT_TYPE_INPUT:
 673                         method = (method_t) flt_cc->methods.input_port_connected;
 674                         break;
 675                 case BT_PORT_TYPE_OUTPUT:
 676                         method = (method_t) flt_cc->methods.output_port_connected;
 677                         break;
 678                 default:
 679                         abort();
 680                 }
 681
 682                 break;
 683         }
 684         case BT_COMPONENT_CLASS_TYPE_SINK:
 685         {
 686                 struct bt_component_class_sink *sink_cc = (void *) comp->class;
 687
 688                 switch (self_port->type) {
 689                 case BT_PORT_TYPE_INPUT:
 690                         method = (method_t) sink_cc->methods.input_port_connected;
 691                         break;
 692                 default:
 693                         abort();
 694                 }
 695
 696                 break;
 697         }
 698         default:
 699                 abort();
 700         }
 701
 702         if (method) {
 703                 BT_LIB_LOGD("Calling user's \"port connected\" method: "
 704                         "%![comp-]+c, %![self-port-]+p, %![other-port-]+p",
 705                         comp, self_port, other_port);
 706                 status = method(comp, self_port, (void *) other_port);
 707                 BT_LOGD("User method returned: status=%s",
 708                         bt_self_component_status_string(status));
 709         }
 710
 711         return status;
 712 }
 713
 714 BT_HIDDEN
 715 void bt_component_port_disconnected(struct bt_component *comp,
 716                 struct bt_port *port)
 717 {
 718         typedef void (*method_t)(void *, void *);
 719
 720         method_t method = NULL;
 721
 722         BT_ASSERT(comp);
 723         BT_ASSERT(port);
 724
 725         switch (comp->class->type) {
 726         case BT_COMPONENT_CLASS_TYPE_SOURCE:
 727         {
 728                 struct bt_component_class_source *src_cc = (void *) comp->class;
 729
 730                 switch (port->type) {
 731                 case BT_PORT_TYPE_OUTPUT:
 732                         method = (method_t) src_cc->methods.output_port_disconnected;
 733                         break;
 734                 default:
 735                         abort();
 736                 }
 737
 738                 break;
 739         }
 740         case BT_COMPONENT_CLASS_TYPE_FILTER:
 741         {
 742                 struct bt_component_class_filter *flt_cc = (void *) comp->class;
 743
 744                 switch (port->type) {
 745                 case BT_PORT_TYPE_INPUT:
 746                         method = (method_t) flt_cc->methods.input_port_disconnected;
 747                         break;
 748                 case BT_PORT_TYPE_OUTPUT:
 749                         method = (method_t) flt_cc->methods.output_port_disconnected;
 750                         break;
 751                 default:
 752                         abort();
 753                 }
 754
 755                 break;
 756         }
 757         case BT_COMPONENT_CLASS_TYPE_SINK:
 758         {
 759                 struct bt_component_class_sink *sink_cc = (void *) comp->class;
 760
 761                 switch (port->type) {
 762                 case BT_PORT_TYPE_INPUT:
 763                         method = (method_t) sink_cc->methods.input_port_disconnected;
 764                         break;
 765                 default:
 766                         abort();
 767                 }
 768
 769                 break;
 770         }
 771         default:
 772                 abort();
 773         }
 774
 775         if (method) {
 776                 BT_LIB_LOGD("Calling user's \"port disconnected\" method: "
 777                         "%![comp-]+c, %![port-]+p", comp, port);
 778                 method(comp, port);
 779         }
 780 }
 781
 782 BT_HIDDEN
 783 void bt_component_add_destroy_listener(struct bt_component *component,
 784                 bt_component_destroy_listener_func func, void *data)
 785 {
 786         struct bt_component_destroy_listener listener;
 787
 788         BT_ASSERT(component);
 789         BT_ASSERT(func);
 790         listener.func = func;
 791         listener.data = data;
 792         g_array_append_val(component->destroy_listeners, listener);
 793         BT_LIB_LOGV("Added destroy listener: %![comp-]+c, "
 794                 "func-addr=%p, data-addr=%p",
 795                 component, func, data);
 796 }
 797
 798 BT_HIDDEN
 799 void bt_component_remove_destroy_listener(struct bt_component *component,
 800                 bt_component_destroy_listener_func func, void *data)
 801 {
 802         uint64_t i;
 803
 804         BT_ASSERT(component);
 805         BT_ASSERT(func);
 806
 807         for (i = 0; i < component->destroy_listeners->len; i++) {
 808                 struct bt_component_destroy_listener *listener =
 809                         &g_array_index(component->destroy_listeners,
 810                                 struct bt_component_destroy_listener, i);
 811
 812                 if (listener->func == func && listener->data == data) {
 813                         g_array_remove_index(component->destroy_listeners, i);
 814                         i--;
 815                         BT_LIB_LOGV("Removed destroy listener: %![comp-]+c, "
 816                                 "func-addr=%p, data-addr=%p",
 817                                 component, func, data);
 818                 }
 819         }
 820 }
 821
 822 void bt_component_get_ref(const struct bt_component *component)
 823 {
 824         bt_object_get_ref(component);
 825 }
 826
 827 void bt_component_put_ref(const struct bt_component *component)
 828 {
 829         bt_object_put_ref(component);
 830 }