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* util.cache: Change behaviour of on_evict (and tests). Now accepts false ↵Matthew Wild2016-03-171-5/+5
| | | | instead of a function (never evict), or on_evict can return false to prevent eviction.
* util.cache: Add head() and tail() methods (and tests)Matthew Wild2016-03-171-0/+12
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* util.cache (and tests): Call on_evict after insertion of the new key, so ↵Matthew Wild2015-12-221-5/+6
| | | | inside on_evict we can be more certain about the current state of the cache (i.e. full, new item added, old item removed)
* util.cache: Small update to prefix private fields with an underscore, add a ↵Matthew Wild2015-11-261-32/+43
| | | | :count() method (same as util.queue) and add an optional on_evict callback
* util.cache: Make sure cache size is specified as an integerKim Alvefur2015-11-251-0/+2
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* util.cache: Ordered key->value data structure, with size limit (same as pubsub)Matthew Wild2015-11-241-0/+91