src/persist/cache/Cache.lua

-- Licensed to the Apache Software Foundation (ASF) under one
-- or more contributor license agreements.  See the NOTICE file
-- distributed with this work for additional information
-- regarding copyright ownership.  The ASF licenses this file
-- to you 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
--
--   https://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={}

function Cache:new()
    local o = {}
    setmetatable(o, self)
    self.__index = self
    return o
end
--Set puts key and value into cache.
-- First parameter for extra should be uint denoting expected survival time.
-- If survival time equals 0 or less, the key will always be survival.
function Cache:set(key, value, ...)

end

--Get returns result for key,
--If there's no such key existing in cache,
--ErrNoSuchKey will be returned.
function Cache:get(key)

end

--Delete will remove the specific key in cache.
--If there's no such key existing in cache,
--ErrNoSuchKey will be returned.
function Cache:delete(key)

end

--Clear deletes all the items stored in cache.
function Cache:clear()

end

return Cache