include/babeltrace/component/graph.h

   1 #ifndef BABELTRACE_COMPONENT_GRAPH_H
   2 #define BABELTRACE_COMPONENT_GRAPH_H
   3
   4 /*
   5  * BabelTrace - Babeltrace Graph Interface
   6  *
   7  * Copyright 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   8  *
   9  * Author: Jérémie Galarneau <jeremie.galarneau@efficios.com>
  10  *
  11  * Permission is hereby granted, free of charge, to any person obtaining a copy
  12  * of this software and associated documentation files (the "Software"), to deal
  13  * in the Software without restriction, including without limitation the rights
  14  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  15  * copies of the Software, and to permit persons to whom the Software is
  16  * furnished to do so, subject to the following conditions:
  17  *
  18  * The above copyright notice and this permission notice shall be included in
  19  * all copies or substantial portions of the Software.
  20  *
  21  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  22  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  23  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  24  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  25  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  26  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  27  * SOFTWARE.
  28  */
  29
  30 #include <babeltrace/component/component.h>
  31
  32 #ifdef __cplusplus
  33 extern "C" {
  34 #endif
  35
  36 struct bt_port;
  37 struct bt_connection;
  38
  39 enum bt_graph_status {
  40         /** No sink can consume at the moment. */
  41         BT_GRAPH_STATUS_AGAIN = 2,
  42         /** Downstream component does not support multiple inputs. */
  43         BT_GRAPH_STATUS_END = 1,
  44         BT_GRAPH_STATUS_OK = 0,
  45         /** Downstream component does not support multiple inputs. */
  46         BT_GRAPH_STATUS_MULTIPLE_INPUTS_UNSUPPORTED = -1,
  47         /** Component is already part of another graph. */
  48         BT_GRAPH_STATUS_ALREADY_IN_A_GRAPH = -2,
  49         /** Invalid arguments. */
  50         BT_GRAPH_STATUS_INVALID = -3,
  51         /** No sink in graph. */
  52         BT_GRAPH_STATUS_NO_SINK = -4,
  53         /** General error. */
  54         BT_GRAPH_STATUS_ERROR = -5,
  55 };
  56
  57 typedef void (*bt_graph_port_added_listener)(struct bt_port *port,
  58                 void *data);
  59 typedef void (*bt_graph_port_removed_listener)(struct bt_component *component,
  60                 struct bt_port *port, void *data);
  61 typedef void (*bt_graph_port_connected_listener)(struct bt_port *port,
  62                 void *data);
  63 typedef void (*bt_graph_port_disconnected_listener)(
  64                 struct bt_component *component, struct bt_port *port,
  65                 void *data);
  66
  67 extern struct bt_graph *bt_graph_create(void);
  68
  69 /**
  70  * Creates a connection between two components using the two ports specified
  71  * and adds the connection and components (if not already added) to the graph.
  72  */
  73 extern struct bt_connection *bt_graph_connect(struct bt_graph *graph,
  74                 struct bt_port *upstream,
  75                 struct bt_port *downstream);
  76
  77 /**
  78  * Add a component as a "sibling" of the origin component. Sibling share
  79  * connections equivalent to each other at the time of connection (same
  80  * upstream and downstream ports).
  81  */
  82 extern enum bt_graph_status bt_graph_add_component_as_sibling(
  83                 struct bt_graph *graph, struct bt_component *origin,
  84                 struct bt_component *new_component);
  85
  86 /**
  87  * Run graph to completion or until a single sink is left and "AGAIN" is received.
  88  *
  89  * Runs "bt_component_sink_consume()" on all sinks in round-robin until they all
  90  * indicate that the end is reached or that an error occured.
  91  */
  92 extern enum bt_graph_status bt_graph_run(struct bt_graph *graph);
  93
  94 /**
  95  * Runs "bt_component_sink_consume()" on the graph's sinks. Each invokation will
  96  * invoke "bt_component_sink_consume()" on the next sink, in round-robin, until
  97  * they all indicated that the end is reached.
  98  */
  99 extern enum bt_graph_status bt_graph_consume(struct bt_graph *graph);
 100
 101 extern enum bt_graph_status bt_graph_add_port_added_listener(
 102                 struct bt_graph *graph,
 103                 bt_graph_port_added_listener listener, void *data);
 104
 105 extern enum bt_graph_status bt_graph_add_port_removed_listener(
 106                 struct bt_graph *graph,
 107                 bt_graph_port_removed_listener listener, void *data);
 108
 109 extern enum bt_graph_status bt_graph_add_port_connected_listener(
 110                 struct bt_graph *graph,
 111                 bt_graph_port_connected_listener listener, void *data);
 112
 113 extern enum bt_graph_status bt_graph_add_port_disconnected_listener(
 114                 struct bt_graph *graph,
 115                 bt_graph_port_disconnected_listener listener, void *data);
 116
 117 #ifdef __cplusplus
 118 }
 119 #endif
 120
 121 #endif /* BABELTRACE_COMPONENT_GRAPH_H */