--Copyright 2021 The casbin Authors. All Rights Reserved.
--
--Licensed under the Apache License, Version 2.0 (the "License");
--you may not use this file except in compliance with the License.
--You may obtain a copy of the License at
--
--    http://www.apache.org/licenses/LICENSE-2.0
--
--Unless required by applicable law or agreed to in writing, software
--distributed under the License is distributed on an "AS IS" BASIS,
--WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
--See the License for the specific language governing permissions and
--limitations under the License.
local Cache=require("src/persist/cache/Cache")


local DefaultCache=Cache:new()

function DefaultCache:new()
    local o = {}
    self.__index = self
    setmetatable(o, self)
    o.m={}
    return o
end

function DefaultCache:set(key, value, ...)
    self.m[key] = value
    return nil
end

function DefaultCache:get(key)
    if self.m[key]==nil then
        return nil, false
    else
        return self.m[key], true
    end
end

function DefaultCache:delete(key)
    if self.m[key]==nil then
        return error("there's no such key existing in cache")
    else
        self.m[key]=nil
        return true
    end
end

function DefaultCache:clear()
    self.m = { }
    return true
end

return DefaultCache