handle_response.rb

  def get_location
    response = get_location_response
    if response.success?
      if status = response.to_array(:return, :location_response, :status).first == "FOUND"
        return response

      elsif error = response.to_array(:return, :msisdn_error).first
        raise LocationError, error[:error_message]
        raise APIError, "A problem was encountered with the API response: #{response.inspect}"
      else
        raise APIError, "A problem was encountered with the API response: #{response.inspect}"
      end

    else
      raise APIError, "Connection to API unsuccessful: #{response.inspect}"
    end
  end

Locator.rb

class Locator
  @queue = :location_queue
  def self.perform

    begin
      location = get_location
       # do something useful with location

    rescue LocationError => error
       # do something useful with location error
    end
  end
end