[Zope] Re: Connecting to Zope with a Thick Client

Derrick 'dman' Hudson dman at dman13.dyndns.org
Wed Oct 15 19:11:10 EDT 2003

On Tue, Oct 14, 2003 at 01:56:57PM +0200, Etienne Labuschagne wrote:

| Since we would require "callback" abilities to the clients, XML-RPC
| would not be quite the perfect solution for client to Zope
| communications.  The only way I can think of doing "callbacks" to a
| client with XML-RPC, is if the client polls the server for callbacks
| - not exactly a pure callback!

I did use XML-RPC for one school project that needed callbacks between
a client and server.  What I did was put an XML-RPC server on the
client, then the client would "register" itself with the server
passing the URL to its XML-RPC server.  The server was then an XML-RPC
client when invoking the callback methods.  The main limitation is the
clients can not be hidden behind NAT (but that wasn't a problem for my
school project).  Perhaps this will work for you as well.  For a
quality implementation you would have to search for an available port
to listen on or else the client program will likely run into problems.

I suppose another technique would be for the client to call some
method on the server asking for callback data (kinda of like a poll).
The server could block until it has data to send back.  This sounds
like it would be kind of tricky to implement (it wouldn't be your
usual method calls) and would probably run into timeout problems if
the server didn't return any data soon enough.

(Alternatively you could work on integrating some other protocol, such
as CORBA, that is designed for this sort of usage.)


The crucible for silver and the furnace for gold,
but the Lord tests the heart.
        Proverbs 17:3
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