So, the only issue is that your callback is called multiple times, right?
In that case you can make a counter, which you increase when you're creating callback and decrease when your callback is called. If it's zero again, the work is finished.
Here is a gist code which'll hopefully answer this:
https://gist.github.com/rlidwka/8a375c02042eaf0b05b0
// copying message to personal email, because mailing list is too slow because of pre-moderation nowadays, and I suppose you want the answer quickly
16.11.2014, 17:52, "Alexey Slaykovsky" <[email protected]>:
--Hello, guys! I need help.I wrote a code which takes one object, another object and then changes values of that second object.And this code is nice for me. It makes this transformation async and nonblocking. But! I need my output (https://gist.github.com/slaykovsky/ac72e85a116617fb761d) only once at the end.And I don't know how to do that. I posted question like that one on stackoverflow, but that one is dead.Help me please. I really need to do that.--
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