The problem setup is this; I explained it above, but it this has
become a long thread:

I write a ZOPE product. I want to make use of other software on the
internet and the services that software provides. So I use the methods
exposed by that software via SOAP, XML-RPC, whatever.

One of those methods actually calls my product back, maybe because the
developer has learned that my product itself exposes some (or all) of
its functionality via XML-RPC. If this is all inside one call, which I
can't avoid explicitly as the developer of just my product, I have a
broken transaction on my hands that isn't easy to fix (and maybe
impossible). This holds true for the whole product, even if the method
called by the second server changed some completely unrelated data.

I see what you're saying, but how is this specific to Zope? If you write a Perl program and expose it via mod_perl on Apache, and the program calls out to a service that calls back in to the mod_perl program (no matter how broken of a pattern this was), wouldn't the Apache process that was waiting on data be tied up in the same way?

- C

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