resque-concurrent-restriction

Resque Concurrent Restriction is a plugin for the Resque queueing system (http://github.com/defunkt/resque). It allows one to specify how many of the given job can run concurrently.

Resque Concurrent Restriction requires Resque 1.25 and redis 2.2

Build Status

Install

sudo gem install resque-concurrent-restriction

To use

It is especially useful when a system has intensive jobs for which you should only run a few at a time. What you should do for the IntensiveJob is to make it extend Resque::Plugins::ConcurrentRestriction and specify the concurrent limit (defaults to 1). For example:

class IntensiveJob
  extend Resque::Plugins::ConcurrentRestriction
  concurrent 4

  #rest of your class here
end

That means the IntensiveJob can not have more than 4 jobs running simultaneously

One can also make the concurrency limit depend on the parameters of a job, for example, if you always pass a user_id as the first param, you can restrict the job to run N concurrent jobs per user:

class IntensiveJob
  extend Resque::Plugins::ConcurrentRestriction
  concurrent 4

  def self.concurrent_identifier(*args)
    args.first.to_s
  end

  #rest of your class here
end

Author

Code was originally forked from the resque-restriction plugin (Richard Huang :: [email protected] :: @flyerhzm), but diverged enough that it warranted being its own plugin to keep the code simple.

Matt Conway :: [email protected] :: @mattconway

Copyright (c) 2011 Matt Conway. See LICENSE for details.