Bill Walton wrote:
> If I understand your question correctly, you're looking for a
> distributed
> Ruby library / plugin. The standard library includes dRuby.
...
> WRT doing the work in the same process that handled the request, the
> Rails
> architecture pretty much precludes that, at least as a 'best practice.'
Thanks Bill for the quick response.
Distributed Ruby is pretty heavyweight for what I have in mind. It has
a lot of moving parts. I was thinking lightweight that would just allow
me to time shift a few operations that can take a second or two so that
the page is returned first and then those operations are then performed.
(Example: queue an email.) I'd like to have access to the full cached
model when those post_processing operations run.
I poked around the source a little today and it seems feasible to patch
in at the RailsHandler::process(request, response) level. That method
could be aliased and replaced with a new process method:
alias :old_process :process
def process(request, response)
old_process(request, response)
post_process
end
where post_process was something like
within_timer_block do
while task = @@background_tasks.shift
task.call
end
end
(The controllers would queue their slow operations onto
@@background_tasks.)
The timers supervision is to preclude them taking too much time away
from serving the next pages. And it would be best to not allow more
than one post_processing mongrel at a time for the same session (or
possibly IP:port), lest a runaway Ajax loop consume all the mongrels for
example.
Does this sound feasible? Anyone know of some work along these lines
already?
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