lib/component/connection.c

   1 /*
   2  * connection.c
   3  *
   4  * Babeltrace Connection
   5  *
   6  * Copyright 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   7  *
   8  * Author: Jérémie Galarneau <jeremie.galarneau@efficios.com>
   9  *
  10  * Permission is hereby granted, free of charge, to any person obtaining a copy
  11  * of this software and associated documentation files (the "Software"), to deal
  12  * in the Software without restriction, including without limitation the rights
  13  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  14  * copies of the Software, and to permit persons to whom the Software is
  15  * furnished to do so, subject to the following conditions:
  16  *
  17  * The above copyright notice and this permission notice shall be included in
  18  * all copies or substantial portions of the Software.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  23  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  24  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  25  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  26  * SOFTWARE.
  27  */
  28
  29 #include <babeltrace/component/connection-internal.h>
  30 #include <babeltrace/component/graph-internal.h>
  31 #include <babeltrace/component/port-internal.h>
  32 #include <babeltrace/component/component-source-internal.h>
  33 #include <babeltrace/component/component-filter-internal.h>
  34 #include <babeltrace/object-internal.h>
  35 #include <babeltrace/compiler.h>
  36 #include <glib.h>
  37
  38 static
  39 void bt_connection_destroy(struct bt_object *obj)
  40 {
  41         struct bt_connection *connection = container_of(obj,
  42                         struct bt_connection, base);
  43
  44         /*
  45          * No bt_put on ports as a connection only holds _weak_ references
  46          * to them.
  47          */
  48         g_free(connection);
  49 }
  50
  51 BT_HIDDEN
  52 struct bt_connection *bt_connection_create(
  53                 struct bt_graph *graph,
  54                 struct bt_port *upstream, struct bt_port *downstream)
  55 {
  56         struct bt_connection *connection = NULL;
  57
  58         if (bt_port_get_type(upstream) != BT_PORT_TYPE_OUTPUT) {
  59                 goto end;
  60         }
  61         if (bt_port_get_type(downstream) != BT_PORT_TYPE_INPUT) {
  62                 goto end;
  63         }
  64
  65         connection = g_new0(struct bt_connection, 1);
  66         if (!connection) {
  67                 goto end;
  68         }
  69
  70         bt_object_init(connection, bt_connection_destroy);
  71         /* Weak references are taken, see comment in header. */
  72         connection->output_port = upstream;
  73         connection->input_port = downstream;
  74         bt_port_add_connection(upstream, connection);
  75         bt_port_add_connection(downstream, connection);
  76         bt_object_set_parent(connection, &graph->base);
  77 end:
  78         return connection;
  79 }
  80
  81 struct bt_port *bt_connection_get_input_port(
  82                 struct bt_connection *connection)
  83 {
  84         return connection ? connection->input_port : NULL;
  85 }
  86
  87 struct bt_port *bt_connection_get_output_port(
  88                 struct bt_connection *connection)
  89 {
  90         return connection ? connection->output_port : NULL;
  91 }
  92
  93 struct bt_notification_iterator *
  94 bt_connection_create_notification_iterator(struct bt_connection *connection)
  95 {
  96         struct bt_component *upstream_component = NULL;
  97         struct bt_notification_iterator *it = NULL;
  98
  99         if (!connection) {
 100                 goto end;
 101         }
 102
 103         upstream_component = bt_port_get_component(connection->output_port);
 104         assert(upstream_component);
 105
 106         switch (bt_component_get_class_type(upstream_component)) {
 107         case BT_COMPONENT_CLASS_TYPE_SOURCE:
 108                 it = bt_component_source_create_notification_iterator(
 109                                 upstream_component);
 110                 break;
 111         case BT_COMPONENT_CLASS_TYPE_FILTER:
 112                 it = bt_component_filter_create_notification_iterator(
 113                                 upstream_component);
 114                 break;
 115         default:
 116                 goto end;
 117         }
 118 end:
 119         bt_put(upstream_component);
 120         return it;
 121 }