From: David Collier <lister@...>
Date: 2010-03-28T14:29:21+09:00
Subject: non-blocking calls to external APIs

hi -

sure this is becoming a more common issue for many people - from within
a web-app how to interact with other systems in a non-blocking way. ie i
dont need to wait for a response from the other system in the cycle of
the same user request/response.

i need to send some logging information off to another system, via
rest/http.
in a rails app we're currently using delayedJob, which stores the events
to the DB, and another process sends them. this is a pretty heavy
process.

a simplistic way would be just using  system "curl &" but that will
spawn a system process. not sure about the risks involved with that -
this means one NgInx/rails instance will have to wait for that to
complete, and maybe run into memory issues.

Are there any ways to use the net/http library to "fire and forget" a
call?
or perhaps a simple implementation using threads, that will be less
resource intensive than "curl &"

thanks...

/dc
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