[erlang-questions] Implement parallel sessions

Frans Schneider schneider@REDACTED
Wed Jan 28 18:31:46 CET 2015

I did some testing with your suggestions and would love to get some 
feedback on what I did.
The code is here at https://github.com/schnef/tst.



On 01/27/2015 03:10 PM, Sean Cribbs wrote:
> For those processes that are per-user, or otherwise spin up and do 
> some work and then go away, we use the simple_one_for_one strategy in 
> the supervisor. In your case, the simple_one_for_one supervisor would 
> start the master process of the session (whether it be a supervisor or 
> something else).
> If the master process of the user session is a supervisor, you can 
> create whatever state is needed to be shared (an ETS table perhaps, or 
> maybe its own pid) and then pass it to the children when starting. 
> This supervisor would be a one_for_one, one_for_all, or rest_for_one 
> strategy, depending on the dependencies between its children.
> I wonder whether a single process per session will do (or two, one for 
> user connection and one for the proxy connection), with different 
> functionality being kept simply in multiple modules rather than FSMs. 
> For example, if your connection process handling the TCP socket simply 
> shuttles data to and from, you might consider collapsing it into the 
> process that's next up the stack.
I would like to keep the process separate since each fulfills a very 
specific function and their implementation is very clean now. Merging 
modules would make them much harder to maintain / write / understand. 
Also, using FSM's, especially for the crypt module turns out to be very 
handy. The modules now are quite small but merging them would make it 
one huge beast.

> On Tue, Jan 27, 2015 at 6:14 AM, Imants Cekusins <imantc@REDACTED 
> <mailto:imantc@REDACTED>> wrote:
>     supervisors are meant to supervise only afaik, not to store any state
>     or do anything else.
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> -- 
> Sean Cribbs <sean@REDACTED <mailto:sean@REDACTED>>
> Sr. Software Engineer
> Basho Technologies, Inc.
> http://basho.com/

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