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A resque plugin for limiting how many of a specific job can run concurrently

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resque-concurrent-restriction

Resque Concurrent Restriction is a plugin for the Resque queueing system. 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

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Install

Install it from the command-line:

gem install resque-concurrent-restriction

or add it to your Gemfile:

gem 'resque-concurrent-restriction', '~> 0.6'

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

  def perform
    # ...
  end
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 parameter, 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

  def perform
    # ...
  end
end

Author

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

Matt Conway :: matt@conwaysplace.com :: @mattconway

Copyright

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

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A resque plugin for limiting how many of a specific job can run concurrently

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