Smalltalk and CORBA and generic bridges
Marcel Weiher
marcel at system.de
Fri Dec 11 00:09:30 UTC 1998
> Key targets would be:
> - Design of Smalltalk IDL mappings (I think a prelim one already
> exits on www.omg.org.)
> - Design of IIOP to be implemented under Squeak
> - Design of IDL compiler to translate standard IDL to program
> skeleton and stub coded in Smalltalk/Squeak (with associated design
> of the skeleton and stub).
> - Design of a Naming Service implemented under Squeak.
This is a good plan, but let's make these generic so we can have the
following groups working together on a unified base for diverse
solutions:
1. CORBA fans
2. Native interface hackers
3. Distributed Squeak researchers
It would be a shame if each group were to duplicate lots of base
functionality. Specifically, the points above could be generalized
as follows (off the top of my head):
- a Smalltalk argument marshalling subsystem
- converts Smalltalk objects specified in a msg.to basic types
- converts basic types to external representation
- converts external types to Smalltalk objects (incl. proxies)
- IIOP as a concrete subclass
- HTTP-ng as a (future) concrete subclass
- C-callout as a concrete subclass
- Distributed-Squeak encoder as a concrete subclass
- ...
- needs signature info from signature subsystem
Needed:
- Feedback on IIOP encoding
- Feedback on C-type argument marshalling from API implementors
- Ideas + Feedback on what types need to be encoded
- a signature subsystem
- return a list of basic types to be used by the marshalling subsystem
- CORBA IDL as a concrete subclass
- CORBA dynamic invocaiton interface (DII) as a subclass
- Objective-C dynamic type info as a subclass
- C header-file parser as a subclass
- ...
Needed:
- Feedback on the various type encoding schemes (I could provide
for Objective-C)
- Proxy management
- can be used by many of the specific instances
- Name management
- How to look up objects by name in various systems
- URL, etc.
- For Objective-C, this would usually only be classes
+ application/services ports for distributed object connections
I really, really would not want to have all this effort duplicated
over and over again, and would volunteer to do the integration work.
Marcel
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