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From "Glyn Normington" <>
Subject Undo and chains
Date Mon, 17 Dec 2001 17:03:20 GMT
A little light relief from the other thread...

I'm investigating how undo/onFault processing could be implemented should
it be required ;-).

The Chain interface allows a handler to be added to a chain between
"chain.invoke" and "chain.undo", in which case the handler would get driven
for undo even though it was not driven for invoke.

Should handlers which participate in chains cope with being called for undo
before invoke? Or are there some unwritten restrictions on the use of the
Chain interface?


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