src/lib/graph/message/iterator.h

   1 #ifndef BABELTRACE_GRAPH_MESSAGE_ITERATOR_INTERNAL_H
   2 #define BABELTRACE_GRAPH_MESSAGE_ITERATOR_INTERNAL_H
   3
   4 /*
   5  * Copyright 2017-2018 Philippe Proulx <pproulx@efficios.com>
   6  * Copyright 2015 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a copy
   9  * of this software and associated documentation files (the "Software"), to deal
  10  * in the Software without restriction, including without limitation the rights
  11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12  * copies of the Software, and to permit persons to whom the Software is
  13  * furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included in
  16  * all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  21  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  24  * SOFTWARE.
  25  */
  26
  27 #include "common/macros.h"
  28 #include "lib/object.h"
  29 #include <babeltrace2/graph/connection-const.h>
  30 #include <babeltrace2/graph/message-const.h>
  31 #include <babeltrace2/types.h>
  32 #include "common/assert.h"
  33 #include <stdbool.h>
  34 #include "common/uuid.h"
  35
  36 struct bt_port;
  37 struct bt_graph;
  38
  39 enum bt_self_component_port_input_message_iterator_state {
  40         /* Iterator is not initialized */
  41         BT_SELF_COMPONENT_PORT_INPUT_MESSAGE_ITERATOR_STATE_NON_INITIALIZED,
  42
  43         /* Iterator is active, not at the end yet, and not finalized */
  44         BT_SELF_COMPONENT_PORT_INPUT_MESSAGE_ITERATOR_STATE_ACTIVE,
  45
  46         /*
  47          * Iterator is ended, not finalized yet: the "next" method
  48          * returns BT_MESSAGE_ITERATOR_STATUS_END.
  49          */
  50         BT_SELF_COMPONENT_PORT_INPUT_MESSAGE_ITERATOR_STATE_ENDED,
  51
  52         /* Iterator is currently being finalized */
  53         BT_SELF_COMPONENT_PORT_INPUT_MESSAGE_ITERATOR_STATE_FINALIZING,
  54
  55         /* Iterator is finalized */
  56         BT_SELF_COMPONENT_PORT_INPUT_MESSAGE_ITERATOR_STATE_FINALIZED,
  57
  58         /* Iterator is seeking */
  59         BT_SELF_COMPONENT_PORT_INPUT_MESSAGE_ITERATOR_STATE_SEEKING,
  60
  61         /* Iterator did seek, but returned `BT_MESSAGE_ITERATOR_STATUS_AGAIN` */
  62         BT_SELF_COMPONENT_PORT_INPUT_MESSAGE_ITERATOR_STATE_LAST_SEEKING_RETURNED_AGAIN,
  63
  64         /* Iterator did seek, but returned error status */
  65         BT_SELF_COMPONENT_PORT_INPUT_MESSAGE_ITERATOR_STATE_LAST_SEEKING_RETURNED_ERROR,
  66 };
  67
  68 typedef enum bt_message_iterator_class_next_method_status
  69 (*bt_self_component_port_input_message_iterator_next_method)(
  70                 void *, bt_message_array_const, uint64_t, uint64_t *);
  71
  72 typedef enum bt_message_iterator_class_seek_ns_from_origin_method_status
  73 (*bt_self_component_port_input_message_iterator_seek_ns_from_origin_method)(
  74                 void *, int64_t);
  75
  76 typedef enum bt_message_iterator_class_seek_beginning_method_status
  77 (*bt_self_component_port_input_message_iterator_seek_beginning_method)(
  78                 void *);
  79
  80 typedef enum bt_message_iterator_class_can_seek_ns_from_origin_method_status
  81 (*bt_self_component_port_input_message_iterator_can_seek_ns_from_origin_method)(
  82                 void *, int64_t, bt_bool *);
  83
  84 typedef enum bt_message_iterator_class_can_seek_beginning_method_status
  85 (*bt_self_component_port_input_message_iterator_can_seek_beginning_method)(
  86                 void *, bt_bool *);
  87
  88 struct bt_self_message_iterator_configuration {
  89         bool frozen;
  90         bool can_seek_forward;
  91 };
  92
  93 struct bt_self_component_port_input_message_iterator {
  94         struct bt_object base;
  95         GPtrArray *msgs;
  96         struct bt_component *upstream_component; /* Weak */
  97         struct bt_port *upstream_port; /* Weak */
  98         struct bt_connection *connection; /* Weak */
  99         struct bt_graph *graph; /* Weak */
 100         struct bt_self_message_iterator_configuration config;
 101
 102         /*
 103          * Array of
 104          * `struct bt_self_component_port_input_message_iterator *`
 105          * (weak).
 106          *
 107          * This is an array of upstream message iterators on which this
 108          * iterator depends. The references are weak: an upstream
 109          * message iterator is responsible for removing its entry within
 110          * this array on finalization/destruction.
 111          */
 112         GPtrArray *upstream_msg_iters;
 113
 114         /*
 115          * Downstream message iterator which depends on this message
 116          * iterator (weak).
 117          *
 118          * This can be `NULL` if this message iterator's owner is a sink
 119          * component.
 120          */
 121         struct bt_self_component_port_input_message_iterator *downstream_msg_iter;
 122
 123         struct {
 124                 bt_self_component_port_input_message_iterator_next_method next;
 125
 126                 /* These two are always both set or both unset. */
 127                 bt_self_component_port_input_message_iterator_seek_ns_from_origin_method seek_ns_from_origin;
 128                 bt_self_component_port_input_message_iterator_can_seek_ns_from_origin_method can_seek_ns_from_origin;
 129
 130                 /* These two are always both set or both unset. */
 131                 bt_self_component_port_input_message_iterator_seek_beginning_method seek_beginning;
 132                 bt_self_component_port_input_message_iterator_can_seek_beginning_method can_seek_beginning;
 133         } methods;
 134
 135         enum bt_self_component_port_input_message_iterator_state state;
 136
 137         /*
 138          * Timestamp of the last received message (or INT64_MIN in the
 139          * beginning, or after a seek to beginning).
 140          */
 141         int64_t last_ns_from_origin;
 142
 143         struct {
 144                 enum {
 145                         /* We haven't recorded clock properties yet. */
 146                         CLOCK_EXPECTATION_UNSET,
 147
 148                         /* Expect to have no clock. */
 149                         CLOCK_EXPECTATION_NONE,
 150
 151                         /* Clock with origin_is_unix_epoch true.*/
 152                         CLOCK_EXPECTATION_ORIGIN_UNIX,
 153
 154                         /* Clock with origin_is_unix_epoch false, with a UUID.*/
 155                         CLOCK_EXPECTATION_ORIGIN_OTHER_UUID,
 156
 157                         /* Clock with origin_is_unix_epoch false, without a UUID.*/
 158                         CLOCK_EXPECTATION_ORIGIN_OTHER_NO_UUID,
 159                 } type;
 160
 161                 /*
 162                  * Expected UUID of the clock, if `type`is CLOCK_EXPECTATION_ORIGIN_OTHER_UUID.
 163                  *
 164                  * If the clock's origin is the unix epoch, the UUID is
 165                  * irrelevant (as the clock will be correlatable with other
 166                  * clocks having the same origin).
 167                  */
 168                 bt_uuid_t uuid;
 169         } clock_expectation;
 170
 171         /*
 172          * Data necessary for auto seek (the seek-to-beginning then fast-forward
 173          * seek strategy).
 174          */
 175         struct {
 176                 /*
 177                  * Queue of `const bt_message *` (owned by this queue).
 178                  *
 179                  * When fast-forwarding, we get the messages from upstream in
 180                  * batches. Once we have found the first message with timestamp
 181                  * greater or equal to the seek time, we put it and all of the
 182                  * following message of the batch in this queue.  They will be
 183                  * sent on the next "next" call on this iterator.
 184                  *
 185                  * The messages are in chronological order (i.e. the first to
 186                  * send is the first of the queue).
 187                  */
 188                 GQueue *msgs;
 189
 190                 /*
 191                  * After auto-seeking, we replace the iterator's `next` callback
 192                  * with our own, which returns the contents of the `msgs` queue.
 193                  * This field is where we save the original callback, so we can
 194                  * restore it.
 195                  */
 196                 void *original_next_callback;
 197         } auto_seek;
 198
 199         void *user_data;
 200 };
 201
 202 BT_HIDDEN
 203 void bt_self_component_port_input_message_iterator_try_finalize(
 204                 struct bt_self_component_port_input_message_iterator *iterator);
 205
 206 BT_HIDDEN
 207 void bt_self_component_port_input_message_iterator_set_connection(
 208                 struct bt_self_component_port_input_message_iterator *iterator,
 209                 struct bt_connection *connection);
 210
 211 static inline
 212 const char *bt_self_component_port_input_message_iterator_state_string(
 213                 enum bt_self_component_port_input_message_iterator_state state)
 214 {
 215         switch (state) {
 216         case BT_SELF_COMPONENT_PORT_INPUT_MESSAGE_ITERATOR_STATE_ACTIVE:
 217                 return "ACTIVE";
 218         case BT_SELF_COMPONENT_PORT_INPUT_MESSAGE_ITERATOR_STATE_ENDED:
 219                 return "ENDED";
 220         case BT_SELF_COMPONENT_PORT_INPUT_MESSAGE_ITERATOR_STATE_FINALIZING:
 221                 return "FINALIZING";
 222         case BT_SELF_COMPONENT_PORT_INPUT_MESSAGE_ITERATOR_STATE_FINALIZED:
 223                 return "FINALIZED";
 224         case BT_SELF_COMPONENT_PORT_INPUT_MESSAGE_ITERATOR_STATE_SEEKING:
 225                 return "SEEKING";
 226         case BT_SELF_COMPONENT_PORT_INPUT_MESSAGE_ITERATOR_STATE_LAST_SEEKING_RETURNED_AGAIN:
 227                 return "LAST_SEEKING_RETURNED_AGAIN";
 228         case BT_SELF_COMPONENT_PORT_INPUT_MESSAGE_ITERATOR_STATE_LAST_SEEKING_RETURNED_ERROR:
 229                 return "LAST_SEEKING_RETURNED_ERROR";
 230         default:
 231                 return "(unknown)";
 232         }
 233 };
 234
 235 #endif /* BABELTRACE_GRAPH_MESSAGE_ITERATOR_INTERNAL_H */