def working_on(job)
      data = encode \
        :queue   => job.queue,
        :run_at  => Time.now.utc.iso8601,
        :payload => job.payload
      data_store.set_worker_payload(self,data)
    end
def working_on(job)
      data = encode \
        :queue   => job.queue,
        :run_at  => Time.now.utc.iso8601,
        :payload => job.payload
      data_store.set_worker_payload(self,data)
    end
Given a job, tells Redis we're working on it. Useful for seeing
 what workers are doing and when.