A Resque plugin for ensuring only one instance of your job is running at a time.
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resque-queue-lock.gemspec

README.md

Resque Queue Lock

A Resque plugin. Requires Resque 1.7.0.

If you want only one instance of your job queued at a time, extend it with this module.

For example:

require 'resque/plugins/queue/lock'

class ExampleJob
  extend Resque::Plugins::Queue::Lock

  def self.perform(*args)
    heavy_lifting
  end
end

While this job is queued, no other ExampleJob jobs with the same arguments will be placed on the queue.

If you want to define the lock id yourself you can override the queue_lock class method in your job class. It takes the same arguments as perform. e.g.

class ExampleJob
  extend Resque::Plugins::Queue::Lock

  def self.queue_lock(*args)
    "network-graph"
  end

  def self.perform(*args)
    heavy_lifting
  end
end

This differs from the Resque Lock plugin in that this plugin will allow jobs with the same lock key to be running and in the queue at the same time. It only prevents multiple jobs with the same lock from being in the queue.