Derek Richardson wrote:
*Using* an int id utility, though, doesn't seem to cleanly solve the
problem,
Why?
which makes me wonder if I'm understanding you. If you mean use
the intid utility to map keyrefs to int ids and then map int ids to
uuids, this has a few problems.
Which ones?
What I want to vary is the
implementation - I want to keep the same interface.
Your UUID utility should be able to keep the same interface. But instead
of doing a keyref -> UUID mapping, it refers to the intid utility for
keyref -> intid and itself only does intid -> UUID. This would be
completely transparent to the outsider.
This would be
keeping, and adding another layer to, the implementation and I'll still
have to re-implement the interface on top of it. That's more work than
just copying and doesn't reduce the copying at all, as I see it. Plus,
it'll be (perhaps marginally) slower.
Perhaps. That's something to profile.
If you mean use the intid utility by instantiating one and then changing
the data structures and _generateId() and the events at runtime, this
would indeed solve the need to copy and paste. However, this seems like
an obfuscating solution - who would guess that what is masquerading as
an intid utility is really a uuid utility? Perhaps that's my
static-typing background speaking, but it seems cleaner to have an
"abstract" id utility and then write 10 lines of code to subclass and
turn it into an int id utility and then another 10 lines for uuids.
I sense that I'm missing the point here. Perhaps you can elaborate on
what you mean when you say "use" and "collaboration." I usually know
what those terms mean, but I'm not sure I am getting it in this context.
The paragraph definitely seems to miss the point, so let me speak code::
class UUIDUtility(Contained, Persistent):
def __init__(self):
self.uuids = IOBTree.IOBTree()
self.intids = OIBTree.OIBTree()
def getObject(self, uuid):
intid = self.intids[uuid]
return getUtility(IIntIds).getObject(intid)
def getUUID(self, object):
intid = getUtility(IIntIds).getId(object)
return self.uuids[intid]
I'm omitting several seatbelts and various functions to add/remove
objects from the UUID utility, but I hope you'll get the idea.
--
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