[erlang-questions] Best approach to creating a process/connection pool

Tim Watson <>
Thu Aug 4 12:22:06 CEST 2011


Take a look at the sources for http://zotonic.com/ as they use a
decent connection pool.

On 4 August 2011 08:01, Andrew Berman <> wrote:
> I'm fairly new to Erlang and I am trying to write a process pool which
> essentially is a connection pool to a database.  I have designed the
> application like this:  The main pool gen_server has a queue of PIDs
> of gen_fsm's.  Each gen_fsm calls spawn_links a 3rd party gen_server and carries
> the state of the connection.  So the 3rd party gen_server and the
> gen_fsm should always live and die together.  I currently have set it
> up such that gen_fsm calls proc_lib:spawn_link() to start the 3rd
> party gen_server, but I'm wondering how this factors into the
> supervision tree.  I currently have two supervisors:
>
> Sup1 -> one_for_all -> 2 children: pool gen_server and Sup2
> Sup2 -> simple_one_for_one -> 1 child: gen_fsm
>
> So my question is: is it ok to use spawn_link instead of somehow
> trying to put the 3rd party gen_server into the supervision tree?  If
> it should go into the supervision tree, how would I organize the tree
> then such that the gen_fsm and 3rd party gen_server are reliant on
> each other?
>
> Thanks for any help!
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