Miek Gieben e54c232c8c middleware/cache: split cache in positive and negative and use lru (#298) ...

Make the cache memory bounded, by using a LRU cache. Also split the
cache in a positive and negative one - each with its own controls.

Extend the cache stanza to allow for this:

    cache {
       positive limit [ttl]
       negative limit [ttl]
    }

is now possible. This also add a cache_test.go in the toplevel test/
directory that exercises the caching path.

Fixes #260

2016-10-02 08:31:44 +01:00

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