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Split caching out from the stasis_caching_topic.

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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
This commit is contained in:
David M. Lee
2013-08-01 13:49:34 +00:00
parent 5c13969469
commit e1b959ccbb
54 changed files with 1179 additions and 448 deletions
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15
include/asterisk/channel.h
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@@ -4185,6 +4185,21 @@ 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