library-mirrors/cron.lua
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refactorized pseudo-class out

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Enrique García Cota 2011-04-24 16:29:51 +02:00
parent d74a00145e
commit 39cee89b94
3 changed files with 37 additions and 21 deletions
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4
README.textile
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@ -4,8 +4,8 @@ h1. cron.lua
h1. Examples of use
* @cron.after(time, f)@ will execute f after the given amount of time units.
* @cron.every(time, f)@ will repeat the same action periodically.
* @cron.after(time, callback)@ will execute callback after the given amount of time units.
* @cron.every(time, callback)@ will repeat the same action periodically.
* @cron.cancel(id)@ will stop a timed event from happening. @id@ is returned by @cron.after@ and @cron.every@ respectively. It will stop a timed event from happening, or stop a periodic action.
* @cron.reset()@ removes all timed and periodic actions, and resets the time passed back to 0.
* @cron.update(dt)@ is needed to be executed on the main program loop. @dt@ is the amount of time that has passed since the last iteration. When @cron.update@ is executed, cron will check the list of pending actions and execute them if needed.

33
cron.lua
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@ -6,22 +6,25 @@
-----------------------------------------------------------------------------------------------------------------------
local function checkTimeAndCallback(time, callback)
assert(type(time) == "number" and time > 0, "time must be a positive number")
assert(type(callback) == "function", "callback must be a function")
end
local entries = {}
local TimedEntry = {}
function TimedEntry:new(time, callback, ...)
return setmetatable( {
local function newEntry(time, callback, update, ...)
local entry = {
time = time,
callback = callback,
args = {...},
running = 0
},
{ __index = TimedEntry }
)
running = 0,
update = update
}
entries[entry] = entry
end
function TimedEntry:update(dt)
local function updateTimedEntry(self, dt)
self.running = self.running + dt
if self.running >= self.time then
self.callback(unpack(self.args))
@ -29,6 +32,7 @@ function TimedEntry:update(dt)
end
end
local cron = {}
function cron.reset()
@ -36,11 +40,14 @@ function cron.reset()
end
function cron.after(time, callback, ...)
assert(type(time) == "number" and time > 0, "time must be a positive number")
assert(type(callback) == "function", "callback must be a function")
checkTimeAndCallback(time, callback)
return newEntry(time, callback, updateTimedEntry, ...)
end
function cron.every(time, callback, ...)
checkTimeAndCallback(time, callback)
local entry = TimedEntry:new(time, callback, ...)
entries[entry] = entry
end
function cron.update(dt)

11
spec/cron_spec.lua
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@ -34,7 +34,7 @@ context( 'cron', function()
end)
context( 'after', function()
test( 'Should throw error if time is not a positive number, or f is not function', function()
test( 'Should throw error if time is not a positive number, or callback is not function', function()
assert_error(function() cron.after('error', count) end)
assert_error(function() cron.after(2, 'error') end)
assert_error(function() cron.after(-2, count) end)
@ -61,6 +61,15 @@ context( 'cron', function()
end)
end)
context( 'every', function()
test( 'Should throw error if time is not a positive number, or callback is not function', function()
assert_error(function() cron.every('error', count) end)
assert_error(function() cron.every(2, 'error') end)
assert_error(function() cron.every(-2, count) end)
assert_not_error(function() cron.every(2, count) end)
end)
end)
end)