Node.js: Asynchronous I/O for Fun and Profit
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Stefan Tilkov is co-founder and a principal consultant at InnoQ, a consulting firm with offices in Germany and Switzerland. Stefan focuses on enterprise architecture consulting for Fortune 1000 companies, which currently translates to assessing SOA maturity and deriving appropriate steps for a road map towards a service-oriented enterprise.
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Handling Asynchronous Computations
by
Faisal Waris
Consider for example the F# async monad. To sequence three async calls with data dependencies between them is as simple as writing the following:
async {
let! data1 = asyncCall1()
let! data2 = asyncCall2(data1)
let! data3 = asyncCall2(data2)
return data3
} |> Async.Start
Notice that no nesting of callbacks is required.
And this is all statically type checked. Type inference means very little explicit type information is needed.
Try-catch, sleep, timers, events, async io, etc., all work in async monads without thread blocking.
Similarly fork-join of 3 independent calls is as simple as:
[
asyncCall1();
asyncCall2();
asyncCall3()
] |> Async.Parallel |> Async.Start
You can compose async monads together for handling many complex scenarios.
In moving off of java, the smart people at Node.js maybe should have cast the net a bit wider than just javascript.
Anyone interested understanding the essence of monads can check out this post: fwaris.wordpress.com/2011/07/30/understanding-m...
Re: Handling Asynchronous Computations
by
Axel Rauschmayer
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