kfogel@collab.net wrote:
> Branko Čibej <brane@xbc.nu> writes:
>> Now the question: Can we, according to our versioning rules, demand
>> that a client never uses two different versions of the same function
>> at the same time? In other words, if we add svn_wc_entries_read2, can
>> we modify svn_wc_entries_read to return an error if the entries cache
>> contains the wrong type of structure?
>
> Suppose you write library X, against the Subversion 1.0 API. Then I
> write library Y, against the 1.2 API. Now application A comes along
> and uses *both* X and Y, passing data structures back and forth
> between them.
>
> This would mean that adm_access batons would not be exchangeable in
> this way, even though they are the exact same type in both libraries.
> I think that would be very difficult to document, and difficult for
> people to code around.
>
> So, I am forced to conclude that we can't make such a demand.
If it's possible to return an error, I presume it's possible to in some way
detect when the wrong structure is stored. Wouldn't it then be possible to
just invalidate the cache in such a case (presuming it's actually a cache)
and read from whatever the authoritative source is? Admittedly, that
wouldn't be very fast, but the even when mixing library versions like this
it would still work then...
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Received on Wed Feb 23 05:51:53 2005