lib/graph/graph.c

   1 /*
   2  * graph.c
   3  *
   4  * Babeltrace Plugin Component Graph
   5  *
   6  * Copyright 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   7  * Copyright 2017 Philippe Proulx <pproulx@efficios.com>
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a copy
  10  * of this software and associated documentation files (the "Software"), to deal
  11  * in the Software without restriction, including without limitation the rights
  12  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  13  * copies of the Software, and to permit persons to whom the Software is
  14  * furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included in
  17  * all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  22  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  23  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  25  * SOFTWARE.
  26  */
  27
  28 #define BT_LOG_TAG "GRAPH"
  29 #include <babeltrace/lib-logging-internal.h>
  30
  31 #include <babeltrace/graph/component-internal.h>
  32 #include <babeltrace/graph/graph-internal.h>
  33 #include <babeltrace/graph/connection-internal.h>
  34 #include <babeltrace/graph/component-sink-internal.h>
  35 #include <babeltrace/graph/component-source.h>
  36 #include <babeltrace/graph/component-filter.h>
  37 #include <babeltrace/graph/port.h>
  38 #include <babeltrace/compiler-internal.h>
  39 #include <babeltrace/types.h>
  40 #include <unistd.h>
  41 #include <glib.h>
  42
  43 struct bt_graph_listener {
  44         void *func;
  45         void *data;
  46 };
  47
  48 static
  49 void bt_graph_destroy(struct bt_object *obj)
  50 {
  51         struct bt_graph *graph = container_of(obj,
  52                         struct bt_graph, base);
  53
  54         /*
  55          * The graph's reference count is 0 if we're here. Increment
  56          * it to avoid a double-destroy (possibly infinitely recursive)
  57          * in this situation:
  58          *
  59          * 1. We put and destroy a connection.
  60          * 2. This connection's destructor finalizes its active
  61          *    notification iterators.
  62          * 3. A notification iterator's finalization function gets a
  63          *    new reference on its component (reference count goes from
  64          *    0 to 1).
  65          * 4. Since this component's reference count goes to 1, it takes
  66          *    a reference on its parent (this graph). This graph's
  67          *    reference count goes from 0 to 1.
  68          * 5. The notification iterator's finalization function puts its
  69          *    component reference (reference count goes from 1 to 0).
  70          * 6. Since this component's reference count goes from 1 to 0,
  71          *    it puts its parent (this graph). This graph's reference
  72          *    count goes from 1 to 0.
  73          * 7. Since this graph's reference count goes from 1 to 0,
  74          *    its destructor is called (this function).
  75          *
  76          * With the incrementation below, the graph's reference count at
  77          * step 4 goes from 1 to 2, and from 2 to 1 at step 6. This
  78          * ensures that this function is not called two times.
  79          */
  80         BT_LOGD("Destroying graph: addr=%p", graph);
  81         obj->ref_count.count++;
  82
  83         if (graph->connections) {
  84                 BT_LOGD_STR("Destroying connections.");
  85                 g_ptr_array_free(graph->connections, TRUE);
  86         }
  87         if (graph->components) {
  88                 BT_LOGD_STR("Destroying components.");
  89                 g_ptr_array_free(graph->components, TRUE);
  90         }
  91         if (graph->sinks_to_consume) {
  92                 g_queue_free(graph->sinks_to_consume);
  93         }
  94
  95         if (graph->listeners.port_added) {
  96                 g_array_free(graph->listeners.port_added, TRUE);
  97         }
  98
  99         if (graph->listeners.port_removed) {
 100                 g_array_free(graph->listeners.port_removed, TRUE);
 101         }
 102
 103         if (graph->listeners.ports_connected) {
 104                 g_array_free(graph->listeners.ports_connected, TRUE);
 105         }
 106
 107         if (graph->listeners.ports_disconnected) {
 108                 g_array_free(graph->listeners.ports_disconnected, TRUE);
 109         }
 110
 111         g_free(graph);
 112 }
 113
 114 static
 115 int init_listeners_array(GArray **listeners)
 116 {
 117         int ret = 0;
 118
 119         assert(listeners);
 120         *listeners = g_array_new(FALSE, TRUE, sizeof(struct bt_graph_listener));
 121         if (!*listeners) {
 122                 BT_LOGE_STR("Failed to allocate one GArray.");
 123                 ret = -1;
 124                 goto end;
 125         }
 126
 127 end:
 128         return ret;
 129 }
 130
 131 struct bt_graph *bt_graph_create(void)
 132 {
 133         struct bt_graph *graph;
 134         int ret;
 135
 136         BT_LOGD_STR("Creating graph object.");
 137         graph = g_new0(struct bt_graph, 1);
 138         if (!graph) {
 139                 BT_LOGE_STR("Failed to allocate one graph.");
 140                 goto end;
 141         }
 142
 143         bt_object_init(graph, bt_graph_destroy);
 144
 145         graph->connections = g_ptr_array_new_with_free_func(bt_object_release);
 146         if (!graph->connections) {
 147                 BT_LOGE_STR("Failed to allocate one GPtrArray.");
 148                 goto error;
 149         }
 150         graph->components = g_ptr_array_new_with_free_func(bt_object_release);
 151         if (!graph->components) {
 152                 BT_LOGE_STR("Failed to allocate one GPtrArray.");
 153                 goto error;
 154         }
 155         graph->sinks_to_consume = g_queue_new();
 156         if (!graph->sinks_to_consume) {
 157                 BT_LOGE_STR("Failed to allocate one GQueue.");
 158                 goto error;
 159         }
 160
 161         ret = init_listeners_array(&graph->listeners.port_added);
 162         if (ret) {
 163                 BT_LOGE_STR("Cannot create the \"port added\" listener array.");
 164                 goto error;
 165         }
 166
 167         ret = init_listeners_array(&graph->listeners.port_removed);
 168         if (ret) {
 169                 BT_LOGE_STR("Cannot create the \"port removed\" listener array.");
 170                 goto error;
 171         }
 172
 173         ret = init_listeners_array(&graph->listeners.ports_connected);
 174         if (ret) {
 175                 BT_LOGE_STR("Cannot create the \"port connected\" listener array.");
 176                 goto error;
 177         }
 178
 179         ret = init_listeners_array(&graph->listeners.ports_disconnected);
 180         if (ret) {
 181                 BT_LOGE_STR("Cannot create the \"port disconneted\" listener array.");
 182                 goto error;
 183         }
 184
 185         BT_LOGD("Created graph object: addr=%p", graph);
 186
 187 end:
 188         return graph;
 189 error:
 190         BT_PUT(graph);
 191         goto end;
 192 }
 193
 194 struct bt_connection *bt_graph_connect_ports(struct bt_graph *graph,
 195                 struct bt_port *upstream_port,
 196                 struct bt_port *downstream_port)
 197 {
 198         struct bt_connection *connection = NULL;
 199         struct bt_graph *upstream_graph = NULL;
 200         struct bt_graph *downstream_graph = NULL;
 201         struct bt_component *upstream_component = NULL;
 202         struct bt_component *downstream_component = NULL;
 203         enum bt_component_status component_status;
 204         bt_bool upstream_was_already_in_graph;
 205         bt_bool downstream_was_already_in_graph;
 206
 207         if (!graph) {
 208                 BT_LOGW_STR("Invalid parameter: graph is NULL.");
 209                 goto end;
 210         }
 211
 212         if (!upstream_port) {
 213                 BT_LOGW_STR("Invalid parameter: upstream port is NULL.");
 214                 goto end;
 215         }
 216
 217         if (!downstream_port) {
 218                 BT_LOGW_STR("Invalid parameter: downstream port is NULL.");
 219                 goto end;
 220         }
 221
 222         BT_LOGD("Connecting component ports within graph: "
 223                 "graph-addr=%p, "
 224                 "upstream-port-addr=%p, upstream-port-name=\"%s\", "
 225                 "downstream-port-addr=%p, downstream-port-name=\"%s\"",
 226                 graph, upstream_port, bt_port_get_name(upstream_port),
 227                 downstream_port, bt_port_get_name(downstream_port));
 228
 229         if (graph->canceled) {
 230                 BT_LOGW_STR("Invalid parameter: graph is canceled.");
 231                 goto end;
 232         }
 233
 234         /* Ensure appropriate types for upstream and downstream ports. */
 235         if (bt_port_get_type(upstream_port) != BT_PORT_TYPE_OUTPUT) {
 236                 BT_LOGW_STR("Invalid parameter: upstream port is not an output port.");
 237                 goto end;
 238         }
 239         if (bt_port_get_type(downstream_port) != BT_PORT_TYPE_INPUT) {
 240                 BT_LOGW_STR("Invalid parameter: downstream port is not an input port.");
 241                 goto end;
 242         }
 243
 244         /* Ensure that both ports are currently unconnected. */
 245         if (bt_port_is_connected(upstream_port)) {
 246                 BT_LOGW_STR("Invalid parameter: upstream port is already connected.");
 247                 goto end;
 248         }
 249
 250         if (bt_port_is_connected(downstream_port)) {
 251                 BT_LOGW_STR("Invalid parameter: downstream port is already connected.");
 252                 goto end;
 253         }
 254
 255         /*
 256          * Ensure that both ports are still attached to their creating
 257          * component.
 258          */
 259         upstream_component = bt_port_get_component(upstream_port);
 260         if (!upstream_component) {
 261                 BT_LOGW_STR("Invalid parameter: upstream port is loose (does not belong to a component)");
 262                 goto end;
 263         }
 264
 265         downstream_component = bt_port_get_component(downstream_port);
 266         if (!downstream_component) {
 267                 BT_LOGW_STR("Invalid parameter: downstream port is loose (does not belong to a component)");
 268                 goto end;
 269         }
 270
 271         BT_LOGD("Connecting component ports: "
 272                 "upstream-comp-addr=%p, upstream-comp-name=\"%s\", "
 273                 "downstream-comp-addr=%p, downstream-comp-name=\"%s\"",
 274                 upstream_component, bt_component_get_name(upstream_component),
 275                 downstream_component, bt_component_get_name(downstream_component));
 276
 277         /* Ensure the components are not already part of another graph. */
 278         upstream_graph = bt_component_get_graph(upstream_component);
 279         if (upstream_graph && (graph != upstream_graph)) {
 280                 BT_LOGW("Invalid parameter: upstream port's component is already part of another graph: "
 281                         "other-graph-addr=%p", upstream_graph);
 282                 goto error;
 283         }
 284         upstream_was_already_in_graph = (graph == upstream_graph);
 285         downstream_graph = bt_component_get_graph(downstream_component);
 286         if (downstream_graph && (graph != downstream_graph)) {
 287                 BT_LOGW("Invalid parameter: downstream port's component is already part of another graph: "
 288                         "other-graph-addr=%p", downstream_graph);
 289                 goto error;
 290         }
 291         downstream_was_already_in_graph = (graph == downstream_graph);
 292
 293         /*
 294          * At this point the ports are not connected yet. Both
 295          * components need to accept an eventual connection to their
 296          * port by the other port before we continue.
 297          */
 298         BT_LOGD_STR("Asking upstream component to accept the connection.");
 299         component_status = bt_component_accept_port_connection(
 300                 upstream_component, upstream_port, downstream_port);
 301         if (component_status != BT_COMPONENT_STATUS_OK) {
 302                 if (component_status == BT_COMPONENT_STATUS_REFUSE_PORT_CONNECTION) {
 303                         BT_LOGD_STR("Upstream component refused the connection.");
 304                 } else {
 305                         BT_LOGW("Cannot ask upstream component to accept the connection: "
 306                                 "status=%s", bt_component_status_string(component_status));
 307                 }
 308
 309                 goto error;
 310         }
 311
 312         BT_LOGD_STR("Asking downstream component to accept the connection.");
 313         component_status = bt_component_accept_port_connection(
 314                 downstream_component, downstream_port, upstream_port);
 315         if (component_status != BT_COMPONENT_STATUS_OK) {
 316                 if (component_status == BT_COMPONENT_STATUS_REFUSE_PORT_CONNECTION) {
 317                         BT_LOGD_STR("Downstream component refused the connection.");
 318                 } else {
 319                         BT_LOGW("Cannot ask downstream component to accept the connection: "
 320                                 "status=%s", bt_component_status_string(component_status));
 321                 }
 322
 323                 goto error;
 324         }
 325
 326         BT_LOGD_STR("Creating connection.");
 327         connection = bt_connection_create(graph, upstream_port,
 328                         downstream_port);
 329         if (!connection) {
 330                 BT_LOGW("Cannot create connection object.");
 331                 goto error;
 332         }
 333
 334         BT_LOGD("Connection object created: conn-addr=%p", connection);
 335
 336         /*
 337          * Ownership of upstream_component/downstream_component and of
 338          * the connection object is transferred to the graph.
 339          */
 340         g_ptr_array_add(graph->connections, connection);
 341
 342         if (!upstream_was_already_in_graph) {
 343                 g_ptr_array_add(graph->components, upstream_component);
 344                 bt_component_set_graph(upstream_component, graph);
 345         }
 346         if (!downstream_was_already_in_graph) {
 347                 g_ptr_array_add(graph->components, downstream_component);
 348                 bt_component_set_graph(downstream_component, graph);
 349                 if (bt_component_get_class_type(downstream_component) ==
 350                                 BT_COMPONENT_CLASS_TYPE_SINK) {
 351                         g_queue_push_tail(graph->sinks_to_consume,
 352                                         downstream_component);
 353                 }
 354         }
 355
 356         /*
 357          * The graph is now the parent of these components which
 358          * garantees their existence for the duration of the graph's
 359          * lifetime.
 360          */
 361
 362         /*
 363          * Notify both components that their port is connected.
 364          */
 365         BT_LOGD_STR("Notifying upstream component that its port is connected.");
 366         bt_component_port_connected(upstream_component, upstream_port,
 367                 downstream_port);
 368         BT_LOGD_STR("Notifying downstream component that its port is connected.");
 369         bt_component_port_connected(downstream_component, downstream_port,
 370                 upstream_port);
 371
 372         /*
 373          * Notify the graph's creator that both ports are connected.
 374          */
 375         BT_LOGD_STR("Notifying graph's user that new component ports are connected.");
 376         bt_graph_notify_ports_connected(graph, upstream_port, downstream_port);
 377         BT_LOGD("Connected component ports within graph: "
 378                 "graph-addr=%p, "
 379                 "upstream-comp-addr=%p, upstream-comp-name=\"%s\", "
 380                 "downstream-comp-addr=%p, downstream-comp-name=\"%s\", "
 381                 "upstream-port-addr=%p, upstream-port-name=\"%s\", "
 382                 "downstream-port-addr=%p, downstream-port-name=\"%s\"",
 383                 graph,
 384                 upstream_component, bt_component_get_name(upstream_component),
 385                 downstream_component, bt_component_get_name(downstream_component),
 386                 upstream_port, bt_port_get_name(upstream_port),
 387                 downstream_port, bt_port_get_name(downstream_port));
 388
 389 end:
 390         bt_put(upstream_graph);
 391         bt_put(downstream_graph);
 392         bt_put(upstream_component);
 393         bt_put(downstream_component);
 394         return connection;
 395
 396 error:
 397         BT_PUT(upstream_component);
 398         BT_PUT(downstream_component);
 399         goto end;
 400 }
 401
 402 enum bt_graph_status bt_graph_consume(struct bt_graph *graph)
 403 {
 404         struct bt_component *sink;
 405         enum bt_graph_status status = BT_GRAPH_STATUS_OK;
 406         enum bt_component_status comp_status;
 407         GList *current_node;
 408
 409         if (!graph) {
 410                 BT_LOGW_STR("Invalid parameter: graph is NULL.");
 411                 status = BT_GRAPH_STATUS_INVALID;
 412                 goto end;
 413         }
 414
 415         BT_LOGV("Making sink consume: addr=%p", graph);
 416
 417         if (graph->canceled) {
 418                 BT_LOGW_STR("Invalid parameter: graph is canceled.");
 419                 status = BT_GRAPH_STATUS_CANCELED;
 420                 goto end;
 421         }
 422
 423         if (g_queue_is_empty(graph->sinks_to_consume)) {
 424                 BT_LOGV_STR("Graph's sink queue is empty: end of graph.");
 425                 status = BT_GRAPH_STATUS_END;
 426                 goto end;
 427         }
 428
 429         current_node = g_queue_pop_head_link(graph->sinks_to_consume);
 430         sink = current_node->data;
 431         BT_LOGV("Chose next sink to consume: comp-addr=%p, comp-name=\"%s\"",
 432                 sink, bt_component_get_name(sink));
 433         comp_status = bt_component_sink_consume(sink);
 434         BT_LOGV("Consumed from sink: status=%s",
 435                 bt_component_status_string(comp_status));
 436         switch (comp_status) {
 437         case BT_COMPONENT_STATUS_OK:
 438                 break;
 439         case BT_COMPONENT_STATUS_END:
 440                 status = BT_GRAPH_STATUS_END;
 441                 break;
 442         case BT_COMPONENT_STATUS_AGAIN:
 443                 status = BT_GRAPH_STATUS_AGAIN;
 444                 break;
 445         case BT_COMPONENT_STATUS_INVALID:
 446                 status = BT_GRAPH_STATUS_INVALID;
 447                 break;
 448         default:
 449                 status = BT_GRAPH_STATUS_ERROR;
 450                 break;
 451         }
 452
 453         if (status != BT_GRAPH_STATUS_END) {
 454                 g_queue_push_tail_link(graph->sinks_to_consume, current_node);
 455                 goto end;
 456         }
 457
 458         /* End reached, the node is not added back to the queue and free'd. */
 459         g_queue_delete_link(graph->sinks_to_consume, current_node);
 460
 461         /* Don't forward an END status if there are sinks left to consume. */
 462         if (!g_queue_is_empty(graph->sinks_to_consume)) {
 463                 status = BT_GRAPH_STATUS_OK;
 464                 goto end;
 465         }
 466 end:
 467         BT_LOGV("Graph consumed: status=%s", bt_graph_status_string(status));
 468         return status;
 469 }
 470
 471 enum bt_graph_status bt_graph_run(struct bt_graph *graph)
 472 {
 473         enum bt_graph_status status = BT_GRAPH_STATUS_OK;
 474
 475         if (!graph) {
 476                 BT_LOGW_STR("Invalid parameter: graph is NULL.");
 477                 status = BT_GRAPH_STATUS_INVALID;
 478                 goto end;
 479         }
 480
 481         BT_LOGV("Running graph: addr=%p", graph);
 482
 483         do {
 484                 status = bt_graph_consume(graph);
 485                 if (status == BT_GRAPH_STATUS_AGAIN) {
 486                         /*
 487                          * If AGAIN is received and there are multiple
 488                          * sinks, go ahead and consume from the next
 489                          * sink.
 490                          *
 491                          * However, in the case where a single sink is
 492                          * left, the caller can decide to busy-wait and
 493                          * call bt_graph_run() continuously until the
 494                          * source is ready or it can decide to sleep for
 495                          * an arbitrary amount of time.
 496                          */
 497                         if (graph->sinks_to_consume->length > 1) {
 498                                 status = BT_GRAPH_STATUS_OK;
 499                         }
 500                 }
 501         } while (status == BT_GRAPH_STATUS_OK);
 502
 503         if (g_queue_is_empty(graph->sinks_to_consume)) {
 504                 status = BT_GRAPH_STATUS_END;
 505         }
 506
 507 end:
 508         BT_LOGV("Graph ran: status=%s", bt_graph_status_string(status));
 509         return status;
 510 }
 511
 512 static
 513 int add_listener(GArray *listeners, void *func, void *data)
 514 {
 515         struct bt_graph_listener listener = {
 516                 .func = func,
 517                 .data = data,
 518         };
 519
 520         g_array_append_val(listeners, listener);
 521         return listeners->len - 1;
 522 }
 523
 524 int bt_graph_add_port_added_listener(
 525                 struct bt_graph *graph,
 526                 bt_graph_port_added_listener listener, void *data)
 527 {
 528         int ret;
 529
 530         if (!graph) {
 531                 BT_LOGW_STR("Invalid parameter: graph is NULL.");
 532                 ret = -1;
 533                 goto end;
 534         }
 535
 536         if (!listener) {
 537                 BT_LOGW_STR("Invalid parameter: listener is NULL.");
 538                 ret = -1;
 539                 goto end;
 540         }
 541
 542         ret = add_listener(graph->listeners.port_added, listener, data);
 543         BT_LOGV("Added \"port added\" listener to graph: "
 544                 "graph-addr=%p, listener-addr=%p, pos=%d",
 545                 graph, listener, ret);
 546
 547 end:
 548         return ret;
 549 }
 550
 551 int bt_graph_add_port_removed_listener(
 552                 struct bt_graph *graph,
 553                 bt_graph_port_removed_listener listener, void *data)
 554 {
 555         int ret;
 556
 557         if (!graph) {
 558                 BT_LOGW_STR("Invalid parameter: graph is NULL.");
 559                 ret = -1;
 560                 goto end;
 561         }
 562
 563         if (!listener) {
 564                 BT_LOGW_STR("Invalid parameter: listener is NULL.");
 565                 ret = -1;
 566                 goto end;
 567         }
 568
 569         ret = add_listener(graph->listeners.port_removed, listener, data);
 570         BT_LOGV("Added \"port removed\" listener to graph: "
 571                 "graph-addr=%p, listener-addr=%p, pos=%d",
 572                 graph, listener, ret);
 573
 574 end:
 575         return ret;
 576 }
 577
 578 int bt_graph_add_ports_connected_listener(
 579                 struct bt_graph *graph,
 580                 bt_graph_ports_connected_listener listener, void *data)
 581 {
 582         int ret;
 583
 584         if (!graph) {
 585                 BT_LOGW_STR("Invalid parameter: graph is NULL.");
 586                 ret = -1;
 587                 goto end;
 588         }
 589
 590         if (!listener) {
 591                 BT_LOGW_STR("Invalid parameter: listener is NULL.");
 592                 ret = -1;
 593                 goto end;
 594         }
 595
 596         ret = add_listener(graph->listeners.ports_connected, listener, data);
 597         BT_LOGV("Added \"port connected\" listener to graph: "
 598                 "graph-addr=%p, listener-addr=%p, pos=%d",
 599                 graph, listener, ret);
 600
 601 end:
 602         return ret;
 603 }
 604
 605 int bt_graph_add_ports_disconnected_listener(
 606                 struct bt_graph *graph,
 607                 bt_graph_ports_disconnected_listener listener, void *data)
 608 {
 609         int ret;
 610
 611         if (!graph) {
 612                 BT_LOGW_STR("Invalid parameter: graph is NULL.");
 613                 ret = -1;
 614                 goto end;
 615         }
 616
 617         if (!listener) {
 618                 BT_LOGW_STR("Invalid parameter: listener is NULL.");
 619                 ret = -1;
 620                 goto end;
 621         }
 622
 623         ret = add_listener(graph->listeners.ports_disconnected, listener, data);
 624         BT_LOGV("Added \"port disconnected\" listener to graph: "
 625                 "graph-addr=%p, listener-addr=%p, pos=%d",
 626                 graph, listener, ret);
 627
 628 end:
 629         return ret;
 630 }
 631
 632 BT_HIDDEN
 633 void bt_graph_notify_port_added(struct bt_graph *graph, struct bt_port *port)
 634 {
 635         size_t i;
 636
 637         BT_LOGV("Notifying graph listeners that a port was added: "
 638                 "graph-addr=%p, port-addr=%p, port-name=\"%s\"",
 639                 graph, port, bt_port_get_name(port));
 640
 641         for (i = 0; i < graph->listeners.port_added->len; i++) {
 642                 struct bt_graph_listener listener =
 643                         g_array_index(graph->listeners.port_added,
 644                                 struct bt_graph_listener, i);
 645                 bt_graph_port_added_listener func = listener.func;
 646
 647                 assert(func);
 648                 func(port, listener.data);
 649         }
 650 }
 651
 652 BT_HIDDEN
 653 void bt_graph_notify_port_removed(struct bt_graph *graph,
 654                 struct bt_component *comp, struct bt_port *port)
 655 {
 656         size_t i;
 657
 658         BT_LOGV("Notifying graph listeners that a port was removed: "
 659                 "graph-addr=%p, port-addr=%p, port-name=\"%s\"",
 660                 graph, port, bt_port_get_name(port));
 661
 662         for (i = 0; i < graph->listeners.port_removed->len; i++) {
 663                 struct bt_graph_listener listener =
 664                         g_array_index(graph->listeners.port_removed,
 665                                 struct bt_graph_listener, i);
 666                 bt_graph_port_removed_listener func = listener.func;
 667
 668                 assert(func);
 669                 func(comp, port, listener.data);
 670         }
 671 }
 672
 673 BT_HIDDEN
 674 void bt_graph_notify_ports_connected(struct bt_graph *graph,
 675                 struct bt_port *upstream_port, struct bt_port *downstream_port)
 676 {
 677         size_t i;
 678
 679         BT_LOGV("Notifying graph listeners that two ports were connected: "
 680                 "graph-addr=%p, "
 681                 "upstream-port-addr=%p, upstream-port-name=\"%s\", "
 682                 "downstream-port-addr=%p, downstream-port-name=\"%s\"",
 683                 graph, upstream_port, bt_port_get_name(upstream_port),
 684                 downstream_port, bt_port_get_name(downstream_port));
 685
 686         for (i = 0; i < graph->listeners.ports_connected->len; i++) {
 687                 struct bt_graph_listener listener =
 688                         g_array_index(graph->listeners.ports_connected,
 689                                 struct bt_graph_listener, i);
 690                 bt_graph_ports_connected_listener func = listener.func;
 691
 692                 assert(func);
 693                 func(upstream_port, downstream_port, listener.data);
 694         }
 695 }
 696
 697 BT_HIDDEN
 698 void bt_graph_notify_ports_disconnected(struct bt_graph *graph,
 699                 struct bt_component *upstream_comp,
 700                 struct bt_component *downstream_comp,
 701                 struct bt_port *upstream_port, struct bt_port *downstream_port)
 702 {
 703         size_t i;
 704
 705         BT_LOGV("Notifying graph listeners that two ports were disconnected: "
 706                 "graph-addr=%p, "
 707                 "upstream-port-addr=%p, upstream-port-name=\"%s\", "
 708                 "downstream-port-addr=%p, downstream-port-name=\"%s\"",
 709                 graph, upstream_port, bt_port_get_name(upstream_port),
 710                 downstream_port, bt_port_get_name(downstream_port));
 711
 712         for (i = 0; i < graph->listeners.ports_disconnected->len; i++) {
 713                 struct bt_graph_listener listener =
 714                         g_array_index(graph->listeners.ports_disconnected,
 715                                 struct bt_graph_listener, i);
 716                 bt_graph_ports_disconnected_listener func = listener.func;
 717
 718                 assert(func);
 719                 func(upstream_comp, downstream_comp, upstream_port,
 720                         downstream_port, listener.data);
 721         }
 722 }
 723
 724 extern enum bt_graph_status bt_graph_cancel(struct bt_graph *graph)
 725 {
 726         enum bt_graph_status ret = BT_GRAPH_STATUS_OK;
 727
 728         if (!graph) {
 729                 BT_LOGW_STR("Invalid parameter: graph is NULL.");
 730                 ret = BT_GRAPH_STATUS_INVALID;
 731                 goto end;
 732         }
 733
 734         graph->canceled = BT_TRUE;
 735         BT_LOGV("Canceled graph: addr=%p", graph);
 736
 737 end:
 738         return ret;
 739 }
 740
 741 extern bt_bool bt_graph_is_canceled(struct bt_graph *graph)
 742 {
 743         return graph ? graph->canceled : BT_FALSE;
 744 }
 745
 746 BT_HIDDEN
 747 void bt_graph_remove_connection(struct bt_graph *graph,
 748                 struct bt_connection *connection)
 749 {
 750         assert(graph);
 751         assert(connection);
 752         BT_LOGV("Removing graph's connection: graph-addr=%p, conn-addr=%p",
 753                 graph, connection);
 754         g_ptr_array_remove(graph->connections, connection);
 755 }