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util.cache: Call on-eviction callback when shrinking

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Kim Alvefur 2017-11-18 21:35:40 +01:00
parent fbe0a8387a
commit f81f466b28
1 changed files with 6 additions and 1 deletions
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7
util/cache.lua
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@ -120,9 +120,14 @@ function cache_methods:resize(new_size)
new_size = assert(tonumber(new_size), "cache size must be a number"); new_size = assert(tonumber(new_size), "cache size must be a number");
new_size = math.floor(new_size); new_size = math.floor(new_size);
assert(new_size > 0, "cache size must be greater than zero"); assert(new_size > 0, "cache size must be greater than zero");
local on_evict = self._on_evict;
while self._count > new_size do while self._count > new_size do
local tail = self._tail; local tail = self._tail;
local evicted_key = tail.key; local evicted_key, evicted_value = tail.key, tail.value;
if on_evict ~= nil and (on_evict == false or on_evict(evicted_key, evicted_value) == false) then
-- Cache is full, and we're not allowed to evict
return false;
end
_remove(self, tail); _remove(self, tail);
self._data[evicted_key] = nil; self._data[evicted_key] = nil;
end end