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Merge pull request #626 from chrox/kopt-cache

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bugfix: calculate current cache size and free oldest cache if needed
This commit is contained in:
{Qingping,Dave} Hou 2012-11-21 21:39:17 -08:00
commit f41d56d397
1 changed files with 21 additions and 11 deletions
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32
unireader.lua
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@ -1062,21 +1062,31 @@ function UniReader:cacheClaim(size)
error("too much memory claimed")
return false
end
while self.cache_current_memsize + size > self.cache_max_memsize do
-- repeat this until we have enough free memory
-- reduce ttl of each cache
local calculated_size = 0
for k, _ in pairs(self.cache) do
self.cache[k].ttl = self.cache[k].ttl - 1
calculated_size = calculated_size + self.cache[k].size
end
-- free oldest cache until we have free memory
while calculated_size + size > self.cache_max_memsize do
local oldest_cache_ttl = self.cache_max_ttl
local oldest_cache_key = nil
for k, _ in pairs(self.cache) do
if self.cache[k].ttl > 0 then
-- reduce ttl
self.cache[k].ttl = self.cache[k].ttl - 1
else
-- cache slot is at end of life, so kick it out
self.cache_current_memsize = self.cache_current_memsize - self.cache[k].size
self.cache[k].bb:free()
self.cache[k] = nil
if self.cache[k].ttl <= oldest_cache_ttl then
oldest_cache_ttl = self.cache[k].ttl
oldest_cache_key = k
end
end
-- cache slot is at end of life, so kick it out
if oldest_cache_key then
Debug("free cache:", oldest_cache_key, "ttl:", self.cache[oldest_cache_key].ttl)
calculated_size = calculated_size - self.cache[oldest_cache_key].size
self.cache[oldest_cache_key].bb:free()
self.cache[oldest_cache_key] = nil
end
end
self.cache_current_memsize = self.cache_current_memsize + size
self.cache_current_memsize = calculated_size + size
return true
end