Python style question

[Aaron Bentley]

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John A Meinel wrote:
| Martin Pool wrote:
|

| The problem is that really you want a branch hierarchy. You can argue
| that you want a standard Branch object and a BranchStorage hierarchy. It
| doesn't really matter, but to me, that is just one more layer of
| indirection that you don't really need.

It reminds me of the PFS layer in Arch, and I think that's one of the
good things about Arch.  A BranchStore acts as a bridge between the
high-level Branch object and the filesystem/network/etc.

Without that, you wind up doing the Template pattern all over the place,
or else reimplementing the same stuff in each Branch.

I can imagine it would be pretty easy to do things like locally-cached
branchstores, or multiple-source branchstores...

| request pipeline protocol. I'm not sure what functions would return a
| list of entries that we could pipeline, but it would certainly be a
| speed improvement if you could make a bunch of requests, and then wait
| for them on the other end.

You can certainly do something like return a PendingRequest object with
a finish() method to get the object you're actually interested in.


| I think the threads method is a little bit more straightforward to
| program. As then each object can have it's own downloading thread, and
| you can just ask the object if it is ready. But I guess a lot of people
| prefer the select() idiom.

Yeah, it's more performant, and I've heard bad things about Python's
threading.  On the other hand, select can be tricky to get right.

Aaron

- --
Aaron Bentley
www.aaronbentley.com
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