class virtual processor_base :Netplex_types.processor_hooks ->v_processor
    class my_processor hooks =
    object(self)
      inherit Netplex_kit.processor_base hooks
      method process ~when_done container fd proto_name = ...
      method supported_ptypes = ...
    end
 In order to run actions from hooks, redefine the hook methods as in:
    class my_processor hooks =
    object(self)
      inherit Netplex_kit.processor_base hooks as super
      method process ~when_done container fd proto_name = ...
      method supported_ptypes = ...
      method post_start_hook container =
        ... (* my action *);
        super # post_start_hook container
    end