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From: tmoran@acm.org
Newsgroups: comp.lang.ada
Subject: Re: Dynamic dispatch again
References: <3BC0FDB3.F185EDDF@san.rr.com>
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Date: Mon, 08 Oct 2001 04:23:38 GMT
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Date: 2001-10-08T04:23:38+00:00
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>Here, I only get to have one piece of code per
>profile execute per message. I.e., now I only get one accept per unit. I
>can't do something like
>...
>I instead have to store the state and wait passively for a call to be made.
  Huh?  What's wrong with replacing the single changeable xlate with a
bunch of changeable accept's and other calls, eg:

package profile is

  type changeable_content is abstract tagged limited null record;
  type changeable_content_pointer is access all changeable_content'class;

--   procedure xlate_content(what_to_do : in changeable_content;
--                           in_in : in integer; out_out : out integer)
--       is abstract;
    procedure initialize_content(what_to_do : in changeable_content;
                                 params : in ...; ready : out boolean)
      is abstract;
    procedure connection_content(what_to_do : in changeable_content;
                                 params : ...)
      is abstract;
    procedure send_message_content(what_to_do : in changeable_content;
                                   ...)
      is abstract;
    procedure recv_message_content(what_to_do : in changeable_content;
                                   ...)
      is abstract;
    procedure stick_in_database_content(what_to_do : in changeable_content;
                                        ...)
      is abstract;

  task type general_task(content : changeable_content_pointer) is
--     entry xlate(in_in : in integer; out_out : out integer);
    entry initialize(params : in ...; ready : out boolean);
    entry connection(params : ...);
    entry recv_message(...);
  end general_task;
  type general_task_pointer is access general_task;

end profile;

package body profile is

    task body general_task is
    begin
--         loop
--             select
--                 accept xlate(in_in : in integer; out_out : out integer)
-- do
--                     xlate_content(content.all, in_in, out_out);
--                 end xlate;
--             or
--                 terminate;
--             end select;
--         end loop;
      accept initialize(params : in ...; ready : out boolean) do
        initialize_content(content.all, params, ready);
      end accept;
      accept connection(params : ...) do
        -- set up connection
        connection_content(content.all, params);
      end accept;
      send_message(...); -- peer receiving open is first to send message
      send_message_content(content.all, ...);
      accept recv_message(...) do
        -- Process first answer
        recv_message_content(content.all, ...);
      end accept;
      stick_in_database(...);
      stick_in_database_content(content.all, ...);
      accept recv_message(...) do
        -- Process second answer
        recv_message_content(content.all, ...);
      end accept;
      ...
    end general_task;

end profile;