Javascript Socket

[yingi keme]

Is there a way to pause execution of code in a javascript file until a socket connection is established or until it gets socket onmessage is called.

[Marc Fawzi]

onmessage is itself an event, so execution of its handler does not occur until a message is received. 

On Mon, Jul 31, 2017 at 12:30 PM, yingi keme <ying...@gmail.com> wrote:

Is there a way to pause execution of code in a javascript file until a socket connection is established or until it gets socket onmessage is called.

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[yingi keme]

Yea. But other codes in the script goes ahead with the execution while waiting for the event onmessage. How will you pause all other lines till onmessage is called?

Yingi Kem

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[Marc Fawzi]

build an implicit state machine via coroutines (based on es6 generators) and yield (asynchronously in a while loop) till the side effect form onmessage is materialized then kick the coroutine with an event to some specific state where it execute the otherwise-idle part of the code. There are so many ways to do this from a control flow perspective, and then there is Observables (reactive dataflow) 

so depending on whether you want to do it with something established like RxJS (reactive dataflow) or invent your own model on top of Javascript's cooperative multitasking (aka concurrency) primitives ...

if stuff sounds foreign, I would advise going the simpler RxJS route.

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[Curran]

I bet there's a simple solution using some sort of asynchronous control flow. The code that needs to wait for the message can be wrapped in a function that gets invoked in response to the message event.

Yingi, do you have an runnable code example you could share that demonstrates the problem? It's hard to say in detail without seeing any example.

[Marc Fawzi]

Yes but I imagined by "code in JS file" he might have meant it generically, not one specific block of code, and my first thought for async control flow was state machines...

Sure, I suspect the problem is more confined/narrowly defined and not so generic, but you never know...

Sent from my iPhone

On Aug 1, 2017, at 6:16 AM, Curran <curran....@gmail.com> wrote:

I bet there's a simple solution using some sort of asynchronous control flow. The code that needs to wait for the message can be wrapped in a function that gets invoked in response to the message event.

Yingi, do you have an runnable code example you could share that demonstrates the problem? It's hard to say in detail without seeing any example.

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[yingi keme]

Thanks Marc.

And yes i was actually relating to a block of code. I think Curran explanation made it clearer to me because i am quite naive with my javascript skills.

Thanks Curran..!!!! Thanks Marc..!!!!!!!

Yingi Kem

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