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local valueMgr = require 'vm.value'
local sourceMgr = require 'vm.source'
local mt = {}
mt.__index = mt
mt.type = 'chain'
mt.min = 100
mt.max = 100
mt.count = 0
function mt:clearCache()
if self.count <= self.max then
return
end
local n = 0
for uri, value in pairs(self.cache) do
local ok = value:eachInfo(function ()
return true
end)
if ok then
n = n + 1
else
self.cache[uri] = nil
end
end
self.count = n
self.max = self.count * 2
if self.max < self.min then
self.max = self.min
end
end
function mt:get(uri)
if not self.cache[uri] then
self.count = self.count + 1
self:clearCache()
self.cache[uri] = valueMgr.create('any', sourceMgr.dummy())
self.cache[uri]:markGlobal()
self.cache[uri].uri = uri
end
return self.cache[uri]
end
return function ()
return setmetatable({
cache = {},
}, mt)
end
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