Question

Is it possible to start a supervisor module in ejabberd which I can add a gen_fsm module to, per connection?

Specifically, I want to create a supervisor which I start when the server starts (or when connections come in). And I have a couple of gen_servers which I want to start, but the part I’m looking for some guidance on is how to dynamically add a gen_fsm module to my supervisor when I see this user’s presence become available?

Answer 1

You might want to have a look to the Simple one for on supervisor, which:

is a simplified one_for_one supervisor, where all child processes are
dynamically added instances of the same process

…

When started, the supervisor will not start any child processes. Instead, all child
processes are added dynamically by calling:

supervisor:start_child(Sup, List)

…

Basically, you use this kind of supervisors when:

1. All the children are of the same type
2. You want to add children dynamically

Which appears to be your case.