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comparison util/cache.lua @ 8398:3eff1b60269a

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util.cache: Call on-eviction callback when shrinking
author Kim Alvefur <zash@zash.se>
date Sat, 18 Nov 2017 21:35:40 +0100
parents 99d85731e3ee
children c4c06fbb7d87
comparison
equal deleted inserted replaced
8397:99d85731e3ee 8398:3eff1b60269a
118 118
119 function cache_methods:resize(new_size) 119 function cache_methods:resize(new_size)
120 new_size = assert(tonumber(new_size), "cache size must be a number"); 120 new_size = assert(tonumber(new_size), "cache size must be a number");
121 new_size = math.floor(new_size); 121 new_size = math.floor(new_size);
122 assert(new_size > 0, "cache size must be greater than zero"); 122 assert(new_size > 0, "cache size must be greater than zero");
123 local on_evict = self._on_evict;
123 while self._count > new_size do 124 while self._count > new_size do
124 local tail = self._tail; 125 local tail = self._tail;
125 local evicted_key = tail.key; 126 local evicted_key, evicted_value = tail.key, tail.value;
127 if on_evict ~= nil and (on_evict == false or on_evict(evicted_key, evicted_value) == false) then
128 -- Cache is full, and we're not allowed to evict
129 return false;
130 end
126 _remove(self, tail); 131 _remove(self, tail);
127 self._data[evicted_key] = nil; 132 self._data[evicted_key] = nil;
128 end 133 end
129 self.size = new_size; 134 self.size = new_size;
130 return true; 135 return true;