johnbue at msn.com
Tue May 14 08:04:31 New Zealand Standard Time 2002
> On Wed, 8 May 2002, John Buehler wrote:
>> Sean Kelly writes:
>>> From: "Ben Chambers" <bjchamb at bellsouth.net>
>>>> I was thinking that instead of having code snippet archives it
>>>> would be cool if there was some source of expandable Java
>>>> classes. You know, if you want this new feature, simply
>>>> download this .class file and load it into the server using the
>>>> graphical front end. Then simply reboot the server (this might
>>>> not be necessary) and without recompiling or anything you have
>>>> updated your server.
>>> No need for a recompile or even a restart if you design it
>>> correctly. This is the reason for interfaces. This is one of
>>> the few features I wish C++ had, though you can get fairly close
>>> with DLLs.
>> Use Microsoft's C# to make classes with COM interfaces and stuff
>> 'em into the DLLs that you want for the load granularity that you
>> need. A new version of a component implementation is a new
>> component, in a distinct DLL and a distinct class identifier,
>> permitting simultaneous operation.
> You can do all of this with COM or CORBA. C# just makes it
> easier. COM and CORBA are both written on top of RPC, which also
> forces you to define your interfaces cleanly.
Note that COM is not an implementation. COM is just a standard.
COM+ is an implementation (not created by the originators of the COM
standard). RPC is a non-sequitor for local components, of course -
which is important for the newcomer to realize.
If somebody wants to implement interfaces in the COM style
(i.e. IUnknown), then C# is a good language for doing it. COM-style
interfaces can be implemented in any number of languages, including
C, C++ and Visual Basic. My old research group at Microsoft tells
me that C# is a great language for interface implementation. From
what I've been told, I wish I'd been working in it instead of C.
I make no claims about CORBA other than to say that it had its
detractors at Microsoft. Big surprise, I know. Oh, I get it
confused with COBRA insurance all the time, too.
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