Current File : //proc/self/root/opt/imunify360-webshield/lualib/tablepool.lua
local newtab = require "table.new"
local cleartab = require "table.clear"
local setmetatable = setmetatable
local _M = newtab(0, 2)
local max_pool_size = 200
local pools = newtab(0, 4)
function _M.fetch(tag, narr, nrec)
local pool = pools[tag]
if not pool then
pool = newtab(4, 1)
pools[tag] = pool
pool.c = 0
pool[0] = 0
else
local len = pool[0]
if len > 0 then
local obj = pool[len]
pool[len] = nil
pool[0] = len - 1
-- ngx.log(ngx.ERR, "HIT")
return obj
end
end
return newtab(narr, nrec)
end
function _M.release(tag, obj, noclear)
if not obj then
error("object empty", 2)
end
local pool = pools[tag]
if not pool then
pool = newtab(4, 1)
pools[tag] = pool
pool.c = 0
pool[0] = 0
end
if not noclear then
setmetatable(obj, nil)
cleartab(obj)
end
do
local cnt = pool.c + 1
if cnt >= 20000 then
pool = newtab(4, 1)
pools[tag] = pool
pool.c = 0
pool[0] = 0
return
end
pool.c = cnt
end
local len = pool[0] + 1
if len > max_pool_size then
-- discard it simply
return
end
pool[len] = obj
pool[0] = len
end
return _M
-- vi: ft=lua ts=4 sw=4 et
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