=================== BUG #4189: LATEST MODIFICATIONS ==================
http://savannah.gnu.org/bugs/?func=detailbug&bug_id=4189&group_id=99
Changes by: Stefan Urbanek <[EMAIL PROTECTED]>
Date: Fri 07/04/03 at 13:33 (Europe/Bratislava)
What | Removed | Added
---------------------------------------------------------------------------
Severity | 1 - Ordinary | 5 - Major
Status | In Test | Open
------------------ Additional Follow-up Comments ----------------------------
After a small talk on #gnustep i reopen this bug.
Btw. current CVS is broken, so DO in several applications does not work properely or
at all (segfaults).
=================== BUG #4189: FULL BUG SNAPSHOT ===================
Submitted by: stefanu Project: GNUstep
Submitted on: Fri 07/04/03 at 00:40
Category: Base/Foundation Severity: 5 - Major
Bug Group: Bug Resolution: Later
Assigned to: None Status: Open
Summary: broken bycopy in DO
Original Submission: if i have a method with bycopy return value on server side, i am
getting remote objects on clients side insetad of copies. i have to explicitly cast on
client side to some protocol with same method defined as bycopy to make it work.
sometimes it is not possible to cast. The server side should be responsible and
decides what objects are passed by copy or by reference.
This bug is related to one former - DO is using selector information from local
runtime instead of distant runtime. this is wrong and makes it difficult to develop
and debug DO applications.
Follow-up Comments
*******************
-------------------------------------------------------
Date: Fri 07/04/03 at 13:33 By: stefanu
After a small talk on #gnustep i reopen this bug.
Btw. current CVS is broken, so DO in several applications does not work properely or
at all (segfaults).
-------------------------------------------------------
Date: Fri 07/04/03 at 13:26 By: stefanu
To reply...
1.i do not think so. using type information from remote system is more logical.
2. it's not official way to use setProtocolForProxy:, but *recommendation* for
performance reasons, so it should work without that.
3. yes it is, however, i should care about performance and optimalisation, after i
have working application.
4. i disagree. having bycopy only in protocols is dumb, and if DO system fetches
infromation from remotes object, it knows that arguments/return value is bycopy
without needing any protocols.
Protocols are NOT core of DO, but are only helpers.
-------------------------------------------------------
Date: Fri 07/04/03 at 12:21 By: CaS
This works for me in the current CVS, but a few points are worth noting ...
1. Use of the type information from a remote system is a GNUstep extension and is not
portable.
2. The official (OpenStep/MacOS-X)way of dealing with this is to use the
setProtocolForProxy: method of NSDistantObject
3. The DO code is very inefficient if setProtocolForProxy: is not used, since it
requires a round trip to determine type information, even when a typed selector is
available locally.
4. DO kewords like bycopy and byref are only meaningful in protocols (they are ignored
in class interfaces and implementations) ... so the bycopy return value on the server
side must be declared in a protocol to which the
class of the server instance conforms.
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