mirror of
https://github.com/kikito/cron.lua.git
synced 2024-12-19 18:34:20 +00:00
93 lines
3.3 KiB
Lua
93 lines
3.3 KiB
Lua
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-- cron.lua - v1.0 (2011-04)
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-- Enrique García Cota - enrique.garcia.cota [AT] gmail [DOT] com
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-- time-related functions for Lua.
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-- inspired by Javascript's setTimeout and setInterval
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-----------------------------------------------------------------------------------------------------------------------
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-- Copyright (c) 2011 Enrique García Cota
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-- Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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-- The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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local function isCallable(callback)
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local tc = type(callback)
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if tc == 'function' then return true end
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if tc == 'table' then
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local mt = getmetatable(callback)
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return type(mt) == 'table' and type(mt.__call) == 'function'
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end
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return false
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end
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local function checkTimeAndCallback(time, callback)
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assert(type(time) == "number" and time > 0, "time must be a positive number")
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assert(isCallable(callback), "callback must be a function")
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end
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local entries = setmetatable({}, {__mode = "k"})
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local function newEntry(time, callback, update, ...)
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local entry = {
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time = time,
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callback = callback,
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args = {...},
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running = 0,
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update = update
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}
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entries[entry] = entry
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return entry
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end
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local function updateTimedEntry(self, dt) -- returns true if expired
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self.running = self.running + dt
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if self.running >= self.time then
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self.callback(unpack(self.args))
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return true
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end
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end
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local function updatePeriodicEntry(self, dt)
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self.running = self.running + dt
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while self.running >= self.time do
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self.callback(unpack(self.args))
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self.running = self.running - self.time
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end
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end
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local cron = {}
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function cron.reset()
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entries = {}
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end
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function cron.cancel(id)
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entries[id] = nil
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end
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function cron.after(time, callback, ...)
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checkTimeAndCallback(time, callback)
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return newEntry(time, callback, updateTimedEntry, ...)
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end
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function cron.every(time, callback, ...)
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checkTimeAndCallback(time, callback)
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return newEntry(time, callback, updatePeriodicEntry, ...)
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end
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function cron.update(dt)
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assert(type(dt) == "number" and dt > 0, "dt must be a positive number")
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local expired = {}
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for _, entry in pairs(entries) do
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if entry:update(dt, runningTime) then table.insert(expired,entry) end
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end
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for i=1, #expired do entries[expired[i]] = nil end
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end
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return cron
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