Fri, 21 Jul 1995 00:35:06 -0400 (EDT)
Frank DiCostanzo wrote :
> I agree with you completely that the foundation for a distributed object
> system should be based on a message passing system of some sort. Generic
> functions have the problem that they aren't "sent" anywhere so who does
> the computation? who "owns" the gf?
A generic function is a first-class object, it doesn't have to be
"owned" by any of the objects. Who does the computation ? You can
choose the scheme you want :
- A CPU whose primary memory contains the function (code is probably
more difficult to move than data in a heterogenous network, because of
the need to port it as opposed to changing some byte-ordering for
- The CPU whose primary memory contains the most objects needed in the
- The CPU that minimizes bandwidth on some overloaded link.
- The CPU that minimizes the cost ($).
I still think generic functions are better than message
passing. (it gives cheap generality, modularity and reflexion)