That's great to hear! Is your plan to use this style as the default in luvit,
or leave it up to individual apps/plugins to wrap the callback style functions
into coroutine style?
> On Feb 12, 2015, at 5:16 AM, Tim Caswell <t...@creationix.com> wrote:
>
> Yep, this is basically the style I'm using in luvit's new package manager
> (luvit/lit). It's gets a little tricky around error handling, but most that
> can be handled in the spawn and parallel helpers.
>
>> On Feb 12, 2015 2:50 AM, "Connor McKay" <con...@verticalforest.com> wrote:
>> I discovered Luvit about a month ago, and have become very excited about the
>> possibilities it holds. I had never used Lua before, but I am quickly
>> falling in love with its clean, minimalist design (what Javascript
>> could/should have been), and its coroutines. I've read a few posts on this
>> list discussing alternate ideas for an API that would break away from the
>> callback-hell of Node, and I wanted to see if it was possible to create an
>> API that would perfectly mimic synchronous operations, while still allowing
>> asynchronous parallelism and background work. Below is a minimal example
>> (that doesn't actually use Luvit itself):
>>
>> callbacks = {}
>>
>> function event_loop()
>> while (#callbacks > 0) do
>> time = os.time()
>> for i, v in ipairs(callbacks) do
>> if time >= v[1] then
>> table.remove(callbacks, i)
>> v[2]()
>> break
>> end
>> end
>> end
>> end
>>
>> -- Callback style functions
>>
>> function set_timeout(seconds, cb)
>> table.insert(callbacks, {os.time() + seconds, cb})
>> end
>>
>> function load_name(cb)
>> set_timeout(3, function() cb("Bob") end)
>> end
>>
>> -- Synchronous style functions
>>
>> function pause(seconds)
>> local co = coroutine.running()
>> set_timeout(seconds, function()
>> assert(coroutine.resume(co))
>> end)
>> coroutine.yield()
>> end
>>
>> function get_name()
>> local co = coroutine.running()
>> load_name(function(name)
>> assert(coroutine.resume(co, name))
>> end)
>> return coroutine.yield()
>> end
>>
>> -- Parallelization functions
>>
>> function spawn(func)
>> coroutine.wrap(func)()
>> end
>>
>> function parallel(...)
>> local args = {...}
>> local done = 0
>> local co = coroutine.running()
>> function task_done()
>> done = done + 1
>> if done == #args then
>> assert(coroutine.resume(co))
>> end
>> end
>> for i, func in ipairs(args) do
>> coroutine.wrap(function()
>> func()
>> task_done()
>> end)()
>> end
>> coroutine.yield()
>> end
>>
>> -- The main program itself
>>
>> function main()
>> print("Hello main, pause 2")
>> pause(2)
>>
>> print("Getting name...")
>> local name = get_name()
>> print("Name was " .. name)
>>
>> parallel(function()
>> print("Parallel 1, pause 3")
>> pause(3)
>> print("Done parallel 1")
>> end,
>> function()
>> print("Parallel 2, pause 3")
>> pause(3)
>> print("Done parallel 2")
>> end)
>>
>> print("Done parallel, in main")
>>
>> spawn(function()
>> print("In spawn 1, pause for 5 seconds")
>> pause(5)
>> print("Done with spawn 1")
>> end)
>>
>> spawn(function()
>> print("In spawn 2, pause for 5 seconds")
>> pause(5)
>> print("Done with spawn 2")
>> end)
>>
>> print("Main pause 2")
>> pause(2)
>>
>> print("Done main")
>> end
>>
>> coroutine.wrap(main)()
>>
>> event_loop()
>>
>> This is little more than a proof of concept at the moment, but I thought it
>> might be useful in the API design discussion.
>>
>> Thanks,
>> Connor McKay
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