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  """Entry points into the ticket-exchange-based base layer implementation."""
  
  # interfaces is referenced from specification in this module.
  from grpc.framework.base import _ends
  from grpc.framework.base import interfaces  # pylint: disable=unused-import
  
  
  def front_link(work_pool, transmission_pool, utility_pool):
    """Factory function for creating interfaces.FrontLinks.
  
    Args:
      work_pool: A thread pool to be used for doing work within the created
        FrontLink object.
      transmission_pool: A thread pool to be used within the created FrontLink
        object for transmitting values to a joined RearLink object.
      utility_pool: A thread pool to be used within the created FrontLink object
        for utility tasks.
  
    Returns:
      An interfaces.FrontLink.
    """
    return _ends.FrontLink(work_pool, transmission_pool, utility_pool)
  
  
  def back_link(
      servicer, work_pool, transmission_pool, utility_pool, default_timeout,
      maximum_timeout):
    """Factory function for creating interfaces.BackLinks.
  
    Args:
      servicer: An interfaces.Servicer for servicing operations.
      work_pool: A thread pool to be used for doing work within the created
        BackLink object.
      transmission_pool: A thread pool to be used within the created BackLink
        object for transmitting values to a joined ForeLink object.
      utility_pool: A thread pool to be used within the created BackLink object
        for utility tasks.
      default_timeout: A length of time in seconds to be used as the default
        time alloted for a single operation.
      maximum_timeout: A length of time in seconds to be used as the maximum
        time alloted for a single operation.
  
    Returns:
      An interfaces.BackLink.
    """
    return _ends.BackLink(
        servicer, work_pool, transmission_pool, utility_pool, default_timeout,
        maximum_timeout)
  