diff options
author | David M. Lee <dlee@digium.com> | 2013-08-01 13:49:34 +0000 |
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committer | David M. Lee <dlee@digium.com> | 2013-08-01 13:49:34 +0000 |
commit | e1b959ccbb4e47421b37a0f75a2bf89ccd34dcb1 (patch) | |
tree | 3026c96da713bafcf1126c77bde6994f348280bb /include/asterisk/channel.h | |
parent | 5c1396946929ab19e94c117f8ad3db5f78a450bc (diff) |
Split caching out from the stasis_caching_topic.
In working with res_stasis, I discovered a significant limitation to
the current structure of stasis_caching_topics: you cannot subscribe
to cache updates for a single channel/bridge/endpoint/etc.
To address this, this patch splits the cache away from the
stasis_caching_topic, making it a first class object. The stasis_cache
object is shared amongst individual stasis_caching_topics that are
created per channel/endpoint/etc. These are still forwarded to global
whatever_all_cached topics, so their use from most of the code does
not change.
In making these changes, I noticed that we frequently used a similar
pattern for bridges, endpoints and channels:
single_topic ----------------> all_topic
^
|
single_topic_cached ----+----> all_topic_cached
|
+----> cache
This pattern was extracted as the 'Stasis Caching Pattern', defined in
stasis_caching_pattern.h. This avoids a lot of duplicate code between
the different domain objects.
Since the cache is now disassociated from its upstream caching topics,
this also necessitated a change to how the 'guaranteed' flag worked
for retrieving from a cache. The code for handling the caching
guarantee was extracted into a 'stasis_topic_wait' function, which
works for any stasis_topic.
(closes issue ASTERISK-22002)
Review: https://reviewboard.asterisk.org/r/2672/
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@395954 65c4cc65-6c06-0410-ace0-fbb531ad65f3
Diffstat (limited to 'include/asterisk/channel.h')
-rw-r--r-- | include/asterisk/channel.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/asterisk/channel.h b/include/asterisk/channel.h index f6cdd4e62..282230a02 100644 --- a/include/asterisk/channel.h +++ b/include/asterisk/channel.h @@ -4186,6 +4186,21 @@ struct varshead *ast_channel_get_vars(struct ast_channel *chan); struct stasis_topic *ast_channel_topic(struct ast_channel *chan); /*! + * \since 12 + * \brief A topic which publishes the events for a particular channel. + * + * \ref ast_channel_snapshot messages are replaced with \ref stasis_cache_update + * + * If the given \a chan is \c NULL, ast_channel_topic_all_cached() is returned. + * + * \param chan Channel, or \c NULL. + * + * \retval Topic for channel's events. + * \retval ast_channel_topic_all() if \a chan is \c NULL. + */ +struct stasis_topic *ast_channel_topic_cached(struct ast_channel *chan); + +/*! * \brief Get the bridge associated with a channel * \since 12.0.0 * |