From: X-Man <x@...>
Date: 2006-01-25T00:35:34+09:00
Subject: Re: event-driven networking

Couldn't you use DRuby (require 'drb')? That's what I do in my Rails
program. In the 2nd (distributed) server, I spawn a thread immediately
upon request to the the work, and then return right away to the web
process, which returns immediately to the browser.

I don't have callbacks, but I imagine it would be dead-easy to have the
2nd server take a request ID from the 1st, then just call back using a
DRuby call just like the 1st, pushing back the original request ID.

This is the "asynchronous completion token pattern" as described by
Schmidt. Here's the (very verbose) write-up ...
http://www.cs.wustl.edu/~schmidt/PDF/ACT.pdf