[Zope-dev] A summary of "Interfaces vs ZCA concepts"

[Tres Seaver]

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Ethan Jucovy wrote:
> Hi,
> 
> On Fri, Dec 18, 2009 at 9:47 AM, Lennart Regebro <regebro at gmail.com> wrote:
>> On Fri, Dec 18, 2009 at 08:51, Brian Sutherland <brian at vanguardistas.net> wrote:
>>> I like things to fail noisily and loudly unconfigured and give good
>>> information about what's wrong.
>> +1
> [snip]
>> we make zope.interface aware that such a thing as utility-registries
>> exist, but say we don't implement it. I don't think that's a problem.
>> The error message also gives an example of an implementation. That's
>> probably not a problem either.
>>
>>> I feel uncomfortable about that.
>> I don't. :-)
> 
> +1 from my perspective of "I don't know or understand the core ZCA
> codebase very well (and don't understand all the implications in this
> discussion) but often read or trace through the code."  A
> well-documented NotImplementedError seems much more human-useful than
> a default implementation that fulfills the contract, because it
> assertively announces the expectation for the most common case by far:
> "you probably want to plug in a real implementation here."  Then if
> there is a need for the proposed default implementation, it can be
> provided as a plugin by some other package, right?

The same argument applies in your case:  you could plug in your own
wrapper implementation which raised errors if not replaced.

- -1 to raising NotImplementedError.


Tres.
- --
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Tres Seaver          +1 540-429-0999          tseaver at palladion.com
Palladion Software   "Excellence by Design"    http://palladion.com
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