[gmpi] Re: low level API

  • From: "Angus F. Hewlett" <angus@xxxxxxxxxxxxx>
  • To: gmpi@xxxxxxxxxxxxx
  • Date: Wed, 02 Feb 2005 13:14:40 +0000

jeffmcc@xxxxxxxxxx wrote:

The advantage of a dispatcher is you can extend the API by
adding new opcodes, you don't change the binary interface,
makes backward/forward compatibilty very easy.


That's very true. However, it depends on the richness, modularity and object-ness of the API.

For instance, if a GMPI Event is expected in some ways to behave like an object (with get/set methods mediated via the dispatcher), when you extend the functionality you can end up with a highly disordered/unsorted list of dispatcher opcodes.. either that or you have to reserve plenty of space in the opcode enumeration so as to keep like with like - so that all messages beginning with 0x1000 relate to initialisation, 0x2000 to pins and connection, 0x3000 to events...

Best regards,
      Angus.


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