Singleton Jobs in Delayed Job

So I am working on a project where I want a job to run only if there is not one running with the same worker class.   So I monkey patch the Delayed::Job class to have a new method called job_exist?(job).

 

 

Delayed::Job.class_eval do  

    def self.job_exist?(job)    

            return Delayed::Job.find(:first, :conditions => ["handler like ?", "%" + job.name + "%"])  

    end

end

 

Now I can do code that looks like this 

Delayed::Job.enqueue LoadImages.new if !Delayed::Job.job_exist?(LoadImages)

 

I know this is not perfect but for jobs that are considered singletons it works well. 

 

 

Comments

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