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stasis: Use an implementation specific channel snapshot cache.

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Channels no longer use the Stasis cache for channel snapshots. Instead
they are stored in a hash table in stasis_channels which reduces the
number of Stasis messages created and allows better storage.

As a result the following APIs are no longer available since the stasis
cache is no longer used:
ast_channel_topic_cached()
ast_channel_topic_all_cached()

The ast_channel_cache_all() and ast_channel_cache_by_name() functions
now return an ao2_container of ast_channel_snapshots rather than
a container of stasis_messages therefore you can't (and don't need
to) call stasis_cache functions on it.

The ast_channel_topic_all() function now returns a normal topic not
a cached one so you can't use stasis cache functions on it either.

The ast_channel_snapshot_type() stasis message now has the
ast_channel_snapshot_update structure as it's data. It contains the
last snapshot and the new one.

ast_channel_snapshot_get_latest() still returns the latest snapshot.

The latest snapshot is now stored on the channel itself to eliminate
cache hits when Stasis messages that have the snapshot as a payload
are created.

ASTERISK-28102

Change-Id: I9334febff60a82d7c39703e49059fa3a68825786
This commit is contained in:
Joshua Colp
2018-10-10 11:28:18 -03:00
parent 0a60bc1a68
commit d0ccbb3377
28 changed files with 456 additions and 551 deletions
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10
main/app.c
View File

@@ -3244,15 +3244,7 @@ static struct stasis_message *mwi_state_create_message(
mwi_state->old_msgs = old_msgs;
if (!ast_strlen_zero(channel_id)) {
struct stasis_message *chan_message;
chan_message = stasis_cache_get(ast_channel_cache(), ast_channel_snapshot_type(),
channel_id);
if (chan_message) {
mwi_state->snapshot = stasis_message_data(chan_message);
ao2_ref(mwi_state->snapshot, +1);
}
ao2_cleanup(chan_message);
mwi_state->snapshot = ast_channel_snapshot_get_latest(channel_id);
}
if (eid) {