[ZODB-Dev] IStorageIteration

[Jim Fulton]

On Feb 11, 2008, at 1:25 PM, Christian Theune wrote:

> Hi,
>
> Jim Fulton schrieb:
>> On Feb 11, 2008, at 1:19 PM, Christian Theune wrote:
>> ...
>>>>> Also, this code isn't ZEO-compatible (apart from the fact that  
>>>>> ClientStorage doesn't implement the interface).
>>>> How so?
>>>
>>> As far as I understand, ZEO can't pass iterators around directly  
>>> but needs to provide at least some wrapping code on the protocol  
>>> level ...
>> Good point. This, at least, makes the implementation rather tricky.
>
> There is the pattern like undoInfo/Log and record_iternext which  
> provides context by passing in ranges of records to return +  
> tolerance for ranges that don't exist.


I don't think that's going to work here.  Iterating through the  
transactions in the database for each iteration is going to be totally  
non-scalable.

I suppose you could include file positions in the iterator state,  
although that makes me a little uncomfortable. It might be OK here  
though.

Jim

--
Jim Fulton
Zope Corporation