Class: Monque::Worker

Inherits:
Object
  • Object
show all
Defined in:
lib/monque.rb

Instance Method Summary collapse

Constructor Details

#initialize(queues) ⇒ Worker

Returns a new instance of Worker.



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# File 'lib/monque.rb', line 74

def initialize(queues)
  @queues = queues
  @jobs = Monque.jobs_collection
end

Instance Method Details

#mark_finished(job) ⇒ Object 



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# File 'lib/monque.rb', line 123

def mark_finished(job)
  ok = @jobs.find_and_modify(
    :query => {
      '_id' => job['_id'],
      'proc_attempts' => job['proc_attempts']
    },
    :update => job.merge({'finished' => Time.now.to_f})
  )
rescue Mongo::OperationFailure => e
  if e.message =~ /No matching object found/
    raise "This shouldn't happen - job was marked as finished though I had it reserved."
  else
    raise e
  end
end

#reserve ⇒ Object 



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# File 'lib/monque.rb', line 83

def reserve
  @queues.each do |q|
    speculative_job = @jobs.find(
      'queue' => q.to_s,
      'started' => {'$lte' => (Time.now.to_f - RETRY_DELAY)},
      'finished' => {'$exists' => false}
    ).sort('added', :ascending).limit(1).first

    next unless speculative_job
    
    old_procid = speculative_job['procid']
            
    gotted_job = @jobs.find_and_modify(
      :query => {
        '_id' => speculative_job['_id'],
        'proc_attempts' => speculative_job['proc_attempts']
      },
      :update => {
        '$set' =>  {'started' => Time.now.to_f},
        '$push' => {
          'proc_attempts' => {
              'id' => sprintf("%x", rand(1024**3)),
              'by' => worker_id,
              'time' => Time.now.to_f
          }
        }
      },
      :new => true
    )
    
    if gotted_job
      return gotted_job
    else
      nil
    end
  end
  
  nil
end

#work ⇒ Object 



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# File 'lib/monque.rb', line 139

def work
  loop do
    job = reserve
    
    if job         
      cls = Kernel.fetch_class(job['class'])
      $stderr.puts "#{worker_id}: processing #{job.inspect}"
      cls.send(:perform, *JSON.load(job['data']))
      mark_finished(job)
    end
    
    sleep 5
  end
end

#worker_id ⇒ Object 



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# File 'lib/monque.rb', line 79

def worker_id
  @worker_id ||= "#{`hostname`.strip}-#{$$}-#{Time.now.to_f}"
end