-- Abstract interface for fixed length message services (e.g. raw HID)
-- Must be instantiated for each message size.

-- Copyright (C)2017-2023, Philip Munts dba Munts Technologies.
--
-- Redistribution and use in source and binary forms, with or without
-- modification, are permitted provided that the following conditions are met:
--
-- * Redistributions of source code must retain the above copyright notice,
--   this list of conditions and the following disclaimer.
--
-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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-- ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
-- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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GENERIC

  MessageSize : Natural;

PACKAGE Messaging.Fixed IS

  TYPE MessengerInterface IS INTERFACE;

  TYPE Messenger IS ACCESS ALL MessengerInterface'Class;

  SUBTYPE Message IS Messaging.Buffer(0 .. MessageSize - 1);

  -- Send a message

  PROCEDURE Send
   (Self      : MessengerInterface;
    msg       : IN Message) IS ABSTRACT;

  -- Receive a message

  PROCEDURE Receive
   (Self      : MessengerInterface;
    msg       : OUT Message) IS ABSTRACT;

END Messaging.Fixed;