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--!A cross-platform build utility based on 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
--
-- 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.
--
-- Copyright (C) 2015 - 2018, TBOOX Open Source Group.
--
-- @author ruki
-- @file history.lua
--
-- define module: history
local history = history or {}
-- load modules
local os = require("base/os")
local io = require("base/io")
local table = require("base/table")
local utils = require("base/utils")
local string = require("base/string")
local cache = require("project/cache")
-- the cache instance
--
-- @param scopename local.xxxx
-- global.xxxx
--
function history._instance(scopename)
-- check
assert(scopename)
-- init instances
history._INSTANCES = history._INSTANCES or {}
local instances = history._INSTANCES
-- this instance has been initialized?
if instances[scopename] then
return instances[scopename]
end
-- init instance
local instance = table.inherit(history)
-- init cache
instance._CACHE = cache(scopename)
-- save instance
instances[scopename] = instance
-- ok
return instance
end
-- save history
function history:save(key, value)
-- check
assert(key and value ~= nil)
-- load history values first
local values = self:load(key) or {}
-- remove the oldest value if be full
if #values > 64 then
table.remove(values, 1)
end
-- append this value
table.insert(values, value)
-- save history
self._CACHE:set(key, values)
self._CACHE:flush()
end
-- load history
function history:load(key)
-- load it
return self._CACHE:get(key)
end
-- return module: history
return history._instance
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