A declarative API for specifying dependencies that affect template
cache digest computation. In your controller, specify any of said
dependencies:
view_cache_dependency { "phone" if using_phone? }
When the block is evaluated, the resulting value is included in the
cache digest calculation, allowing you to generate different digests
for effectively the same template. (Mostly useful if you're mucking
with template load paths.)
Summary of the changes:
* Add thread_safe gem.
* Use thread safe cache for digestor caching.
* Replace manual synchronization with ThreadSafe::Cache in Relation::Delegation.
* Replace @attribute_method_matchers_cache Hash with ThreadSafe::Cache.
* Use TS::Cache to avoid the synchronisation overhead on listener retrieval.
* Replace synchronisation with TS::Cache usage.
* Use a preallocated array for performance/memory reasons.
* Update the controllers cache to the new AS::Dependencies::ClassCache API.
The original @controllers cache no longer makes much sense after @tenderlove's
changes in 7b6bfe84f3 and f345e2380c.
* Use TS::Cache in the connection pool to avoid locking overhead.
* Use TS::Cache in ConnectionHandler.
