[Zope3-dev] interface implementation errors

[Jim Fulton]

Steve Alexander wrote:
> kapil thangavelu wrote:
> 
>> i wrote up a script to check interface implementation for z3, its 
>> attached
>> along with the error results. the script tries to filter out the 
>> errors that
>> are caused from dynamic implementation of the interfaces.
> 
> 
> 
> The first error in the file is this:
> 
> Class <type 'Persistence.Persistent'>, From 
> /home/ender/projects/Zope3/zope3-cvs/lib/python/Persistence/__init__.py
> Asserts but does not implement
> Interface <Interface Persistence.IPersistent.IPersistent at 8287a7c>
> from 
> /home/ender/projects/Zope3/zope3-cvs/lib/python/Persistence/IPersistent.py
> with exception Interface.Exceptions.BrokenImplementation:
> 
>  An object has failed to implement interface <Interface 
> Persistence.IPersistent.IPersistent at 8287a7c>
> 
>         The _p_independent attribute was not provided.
> 
> 
> In the interface IPersistent.py, _p_independent is described as being an 
> optional method that a persistent object type can define to return true 
> if it wants to declare it isn't bothered about read conflicts.
> 
> Is there any mechanism in Interfaces / Schemas to describe that a method 
> may be there, or may be not there?

No, but there should be.

> Or, perhaps we should have an IPersistent without this method, but an 
> IPersistentIndependent (or somesuch name) that extends IPersistent with 
> this method.

That would be a better solution in this case I think.

Jim

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