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On Oct 23, 2018, at 02:56, Uli Kusterer <witness.of.teachtext@gmx.net> wrote:

...

On 18. Sep 2018, at 19:25, Alastair Houghton <alastair@alastairs-place.net> wrote: Well, Cocoa has Distributed Objects, which you could use for this purpose. DO has some interesting behaviour (in particular, watch out - it can throw exceptions, even when calling methods that don’t normally do so), but it does let you send messages to objects fairly easily over a network.

From what I remember, DO also has some very ... interesting behaviour when it comes to time-outs, and predictable timing, as well as dropped connections. Basically, it mostly assumes a stable, near-instant network, and there's no good way to recover from a dropped network, and no control over how long it will take to recover from stalls etc. either.

In short, DO is intended for small LANs, so if you're planning to use it over the internet ... don't.

Thanks, yes, I agree. DO should only be considered for LAN operations. Apt descriptions of its limitations and implementation restrictions. We have had several 24/7 systems running, synchronized via DO since forever. It is very reliable when done right. If not, it can be a mess.

If you need a fairly painless way for network communication, I'd suggest creating your own mechanism on top of queues of message objects and keyed, or better secure, archiving. You can always model things after XPC, with the same method names etc.

This will, again, be for a controlled environment (local LAN). Not sure what direction I’ll go at this point, but at least with the feedback I’ve gotten I can design something knowing I am not overlooking a newly introduced macOS native inter-machine RPC technology. Thanks for your thoughts, Sandor

Cheers, -- Uli Kusterer "The Witnesses of TeachText are everywhere..." http://www.zathras.de

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