include/babeltrace/graph/notification-iterator-internal.h

   1 #ifndef BABELTRACE_GRAPH_NOTIFICATION_ITERATOR_INTERNAL_H
   2 #define BABELTRACE_GRAPH_NOTIFICATION_ITERATOR_INTERNAL_H
   3
   4 /*
   5  * BabelTrace - Notification Iterator Internal
   6  *
   7  * Copyright 2015 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   8  * Copyright 2017 Philippe Proulx <pproulx@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/babeltrace-internal.h>
  30 #include <babeltrace/object-internal.h>
  31 #include <babeltrace/ref-internal.h>
  32 #include <babeltrace/graph/connection.h>
  33 #include <babeltrace/graph/notification.h>
  34 #include <babeltrace/graph/notification-iterator.h>
  35 #include <babeltrace/graph/private-connection-private-notification-iterator.h>
  36 #include <babeltrace/types.h>
  37 #include <babeltrace/assert-internal.h>
  38 #include <stdbool.h>
  39
  40 struct bt_port;
  41 struct bt_graph;
  42
  43 enum bt_notification_iterator_type {
  44         BT_NOTIFICATION_ITERATOR_TYPE_PRIVATE_CONNECTION,
  45         BT_NOTIFICATION_ITERATOR_TYPE_OUTPUT_PORT,
  46 };
  47
  48 enum bt_private_connection_notification_iterator_notif_type {
  49         BT_PRIVATE_CONNECTION_NOTIFICATION_ITERATOR_NOTIF_TYPE_EVENT =                  (1U << 0),
  50         BT_PRIVATE_CONNECTION_NOTIFICATION_ITERATOR_NOTIF_TYPE_INACTIVITY =             (1U << 1),
  51         BT_PRIVATE_CONNECTION_NOTIFICATION_ITERATOR_NOTIF_TYPE_STREAM_BEGIN =           (1U << 2),
  52         BT_PRIVATE_CONNECTION_NOTIFICATION_ITERATOR_NOTIF_TYPE_STREAM_END =             (1U << 3),
  53         BT_PRIVATE_CONNECTION_NOTIFICATION_ITERATOR_NOTIF_TYPE_PACKET_BEGIN =           (1U << 4),
  54         BT_PRIVATE_CONNECTION_NOTIFICATION_ITERATOR_NOTIF_TYPE_PACKET_END =             (1U << 5),
  55         BT_PRIVATE_CONNECTION_NOTIFICATION_ITERATOR_NOTIF_TYPE_DISCARDED_EVENTS =       (1U << 6),
  56         BT_PRIVATE_CONNECTION_NOTIFICATION_ITERATOR_NOTIF_TYPE_DISCARDED_PACKETS =      (1U << 7),
  57 };
  58
  59 enum bt_private_connection_notification_iterator_state {
  60         /* Iterator is not initialized. */
  61         BT_PRIVATE_CONNECTION_NOTIFICATION_ITERATOR_STATE_NON_INITIALIZED,
  62
  63         /* Iterator is active, not at the end yet, and not finalized. */
  64         BT_PRIVATE_CONNECTION_NOTIFICATION_ITERATOR_STATE_ACTIVE,
  65
  66         /*
  67          * Iterator is ended, not finalized yet: the "next" method
  68          * returns BT_NOTIFICATION_ITERATOR_STATUS_END.
  69          */
  70         BT_PRIVATE_CONNECTION_NOTIFICATION_ITERATOR_STATE_ENDED,
  71
  72         /*
  73          * Iterator is finalized, but not at the end yet. This means
  74          * that the "next" method can still return queued notifications
  75          * before returning the BT_NOTIFICATION_ITERATOR_STATUS_CANCELED
  76          * status.
  77          */
  78         BT_PRIVATE_CONNECTION_NOTIFICATION_ITERATOR_STATE_FINALIZED,
  79
  80         /*
  81          * Iterator is finalized and ended: the "next" method always
  82          * returns BT_NOTIFICATION_ITERATOR_STATUS_CANCELED.
  83          */
  84         BT_PRIVATE_CONNECTION_NOTIFICATION_ITERATOR_STATE_FINALIZED_AND_ENDED,
  85 };
  86
  87 struct bt_notification_iterator {
  88         struct bt_object base;
  89         enum bt_notification_iterator_type type;
  90         struct bt_notification *current_notification; /* owned by this */
  91 };
  92
  93 struct bt_notification_iterator_private_connection {
  94         struct bt_notification_iterator base;
  95         struct bt_component *upstream_component; /* Weak */
  96         struct bt_port *upstream_port; /* Weak */
  97         struct bt_connection *connection; /* Weak */
  98         struct bt_graph *graph; /* Weak */
  99
 100         /*
 101          * This hash table keeps the state of a stream as viewed by
 102          * this notification iterator. This is used to, in developer
 103          * mode:
 104          *
 105          * * Automatically enqueue "stream begin", "packet begin",
 106          *   "packet end", and "stream end" notifications depending
 107          *   on the stream's state and on the next notification returned
 108          *   by the upstream component.
 109          *
 110          * * Make sure that, once the notification iterator has seen a
 111          *   "stream end" notification for a given stream, no other
 112          *   notifications which refer to this stream can be delivered
 113          *   by this iterator.
 114          *
 115          * The key (struct bt_stream *) is not owned by this. The
 116          * value is an allocated state structure.
 117          */
 118         GHashTable *stream_states;
 119
 120         enum bt_private_connection_notification_iterator_state state;
 121         void *user_data;
 122 };
 123
 124 struct bt_notification_iterator_output_port {
 125         struct bt_notification_iterator base;
 126         struct bt_graph *graph; /* Owned by this */
 127         struct bt_component *colander; /* Owned by this */
 128         struct bt_port *output_port; /* Owned by this */
 129 };
 130
 131 static inline
 132 struct bt_notification *bt_notification_iterator_borrow_current_notification(
 133                 struct bt_notification_iterator *iterator)
 134 {
 135         BT_ASSERT(iterator);
 136         return iterator->current_notification;
 137 }
 138
 139 static inline
 140 void bt_notification_iterator_replace_current_notification(
 141                 struct bt_notification_iterator *iterator,
 142                 struct bt_notification *notification)
 143 {
 144         BT_ASSERT(iterator);
 145         bt_put(iterator->current_notification);
 146         iterator->current_notification = bt_get(notification);
 147 }
 148
 149 static inline
 150 struct bt_private_connection_private_notification_iterator *
 151 bt_private_connection_private_notification_iterator_from_notification_iterator(
 152                 struct bt_notification_iterator_private_connection *iterator)
 153 {
 154         return (void *) iterator;
 155 }
 156
 157 BT_HIDDEN
 158 enum bt_connection_status bt_private_connection_notification_iterator_create(
 159                 struct bt_component *upstream_comp,
 160                 struct bt_port *upstream_port,
 161                 struct bt_connection *connection,
 162                 struct bt_notification_iterator_private_connection **iterator);
 163
 164 BT_HIDDEN
 165 void bt_private_connection_notification_iterator_finalize(
 166                 struct bt_notification_iterator_private_connection *iterator);
 167
 168 BT_HIDDEN
 169 void bt_private_connection_notification_iterator_set_connection(
 170                 struct bt_notification_iterator_private_connection *iterator,
 171                 struct bt_connection *connection);
 172
 173 static inline
 174 const char *bt_notification_iterator_status_string(
 175                 enum bt_notification_iterator_status status)
 176 {
 177         switch (status) {
 178         case BT_NOTIFICATION_ITERATOR_STATUS_CANCELED:
 179                 return "BT_NOTIFICATION_ITERATOR_STATUS_CANCELED";
 180         case BT_NOTIFICATION_ITERATOR_STATUS_AGAIN:
 181                 return "BT_NOTIFICATION_ITERATOR_STATUS_AGAIN";
 182         case BT_NOTIFICATION_ITERATOR_STATUS_END:
 183                 return "BT_NOTIFICATION_ITERATOR_STATUS_END";
 184         case BT_NOTIFICATION_ITERATOR_STATUS_OK:
 185                 return "BT_NOTIFICATION_ITERATOR_STATUS_OK";
 186         case BT_NOTIFICATION_ITERATOR_STATUS_INVALID:
 187                 return "BT_NOTIFICATION_ITERATOR_STATUS_INVALID";
 188         case BT_NOTIFICATION_ITERATOR_STATUS_ERROR:
 189                 return "BT_NOTIFICATION_ITERATOR_STATUS_ERROR";
 190         case BT_NOTIFICATION_ITERATOR_STATUS_NOMEM:
 191                 return "BT_NOTIFICATION_ITERATOR_STATUS_NOMEM";
 192         case BT_NOTIFICATION_ITERATOR_STATUS_UNSUPPORTED:
 193                 return "BT_NOTIFICATION_ITERATOR_STATUS_UNSUPPORTED";
 194         default:
 195                 return "(unknown)";
 196         }
 197 };
 198
 199 static inline
 200 const char *bt_private_connection_notification_iterator_state_string(
 201                 enum bt_private_connection_notification_iterator_state state)
 202 {
 203         switch (state) {
 204         case BT_PRIVATE_CONNECTION_NOTIFICATION_ITERATOR_STATE_ACTIVE:
 205                 return "BT_PRIVATE_CONNECTION_NOTIFICATION_ITERATOR_STATE_ACTIVE";
 206         case BT_PRIVATE_CONNECTION_NOTIFICATION_ITERATOR_STATE_ENDED:
 207                 return "BT_PRIVATE_CONNECTION_NOTIFICATION_ITERATOR_STATE_ENDED";
 208         case BT_PRIVATE_CONNECTION_NOTIFICATION_ITERATOR_STATE_FINALIZED:
 209                 return "BT_PRIVATE_CONNECTION_NOTIFICATION_ITERATOR_STATE_FINALIZED";
 210         case BT_PRIVATE_CONNECTION_NOTIFICATION_ITERATOR_STATE_FINALIZED_AND_ENDED:
 211                 return "BT_PRIVATE_CONNECTION_NOTIFICATION_ITERATOR_STATE_FINALIZED_AND_ENDED";
 212         default:
 213                 return "(unknown)";
 214         }
 215 };
 216
 217 #endif /* BABELTRACE_GRAPH_NOTIFICATION_ITERATOR_INTERNAL_H */