Class | LRUCache |
In: |
lib/more/facets/lrucache.rb
|
Parent: | Hash |
A cache utilizing a simple LRU (Least Recently Used) policy. The items managed by this cache must respond to the key method. Attempts to optimize reads rather than inserts!
LRU semantics are enforced by inserting the items in a queue. The lru item is always at the tail. Two special sentinels (head, tail) are used to simplify (?) the code.
# File lib/more/facets/lrucache.rb, line 59 def initialize(max_items) @max_items = max_items lru_clear() end
Lookup an item in the cache.
# File lib/more/facets/lrucache.rb, line 66 def [](key) if item = super return lru_touch(item) end end
The inserted item is considered mru!
# File lib/more/facets/lrucache.rb, line 74 def []=(key, item) item = super item.lru_key = key lru_insert(item) end
Delete an item from the cache.
# File lib/more/facets/lrucache.rb, line 82 def delete(key) if item = super lru_delete(item) end end