Let's take spawning and

badlop — Mon, 08 Feb 2016 15:54:52 +0000

Let's take spawning and terminating an erlang process for each xmpp message as the baseline. You could implement that and test how well it behaves.

If you want an alternative that doesn't spawn a process per stanza, try this:
1. At module start, spawn an erlang process that waits in an endless loop. Register that process with name "yourmodule_yourvhost"
2. When the hooked function is called, it just sends an erlang message to that process: yourmodule_yourvhost ! {handlethis, Content}
3. Your process awaits reception of those messages, performs its duty (HTTP request), and continues the loop.

That erlang process has a queue where the erlang messages you send await automatically. This means that only one HTTP request is done at each time, as you have only one process in that duty.

There are examples in ejabberd, see the loop in mod_vcard.

ejabberd - Comments for "Spawning a new process for each message"

Let's take spawning and