praekelt/vumi-go — pull request #819 by jerith (2013-12-12 09:24:13+00:00)
Title: Use MessageMetadataHelper caching more widely

There are a bunch of redis/riak lookups we can cache in `MessageMetadataHelper` to avoid unnecessary work.

I'm going to start with middlewares and the routing table dispatcher because that's what's hurting us the most right now.