On 02/11/2013 11:19 AM, Paul McNett wrote:
On 2/11/13 11:00 AM, Ed Leafe wrote:
On Feb 11, 2013, at 12:36 PM, Paul McNett <[email protected]> wrote:
The rationale is simply that we were loading way too many things upon someone
issuing
'import dabo'. There's a class of users that use very specific things from the
framework inside their web applications, such as only using the biz and data
layer,
but no dApp and no UI, or only using the report writer and nothing else. Rather
than
importing everything everyone would possibly need in 'import dabo', we should
make
things available via explicit import via subpackages.
I think the question is more accurately phrased "what harm was there in
importing those things?"
The harm from the POV of the web application was that it it would take longer to
'import dabo'. Since web applications are stateless they must normally do this
import
with each hit. And since web applications aren't necessarily going to need the
stuff
we were importing up front, it made sense to hold the importing until explicitly
asked for.
Do you see performance improvements? Lower memory requirements?
I see a rough speedup of 5-12.5x of 'import dabo' (.20-.25 sec versus .02-.04
sec).
Of course my desktop application code eventually explicitly imports the stuff
that
dabo used to import up front, though, so overall there isn't a gain for my
desktop
applications.
I thought that namespaces were managed by dicts, and that they were all
pointers to each other, so having, say, dabo.dApp defined doesn't take up any
significant memory over not adding it to the namespace.
That's my understanding as well. But look at all the stuff that dApp.py imports.
Let's not do that until and unless it's needed is all I'm say'n.
Would not the same thing be accomplished by
from dabo import dApp
Paul
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Adrian Klaver
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