[Zope3-dev] Re: [Zope-dev] Re: tal:on-error is a bare except...

[Tres Seaver]

Chris Withers wrote:
> Florent Guillaume wrote:
> 
>> Not done for Z3 as this seems to not be a good idea there according to
>> the gurus. 
> 
> 
> How so?
> 
>> And supposedly ZODB 3.3 can cope with swallowed
>> ConflictErrors
> 
> 
> Really?! Cool, I think, but I find this hard to believe.
> Any anyone enlighten me? Tim?

I don't believe the bare except is *ever* good form in 
production-quality code.  *No* application-level code has enough zen to 
swallow some kinds of exceptions, which is why the Java folks have a 
separate RuntimeError hierarchy.

The fact that newer ZODB's *appear* to prevent later commits does not 
exculpate the use of the bare except in 'tal:on-error' (emphasis added 
to indicate a non-trivial amount of suspicion against the code paths in 
question;  we have claimed to have solved that problem before).

Tres.
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Tres Seaver                                tseaver at zope.com
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