I'm loading up a Tk window for a customer. There are some 2-3 dozen invoices for that customer. I go ahead and pull the info from the database for the invoices, and instantiate them. Now, part of the initialization of the invoice object is to instantiate all the lineitems associated with that invoice. Each invoice makes its own database call(s) to load up its lineitems.

Now, the average user of this screen will look at 2-3 invoices. Why should I pre-load 25-35 invoices, with some 50-70 DB queries, when I can defer loading until the user actually tells me which one they care about?

Now, so far, you say "Just use another screen." But, I didn't write the Invoice object code. I am told I have to reuse code because my PHB needs to look good, but I am not allowed to modify it because my PHB has no clout.

Enter Class::LazyLoad. The Invoice object doesn't even know it's being deferred, nor does it care. The Customer screen now loads really fast and all the information that used to be there still is.

Being right, does not endow the right to be rude; politeness costs nothing.
Being unknowing, is not the same as being stupid.
Expressing a contrary opinion, whether to the individual or the group, is more often a sign of deeper thought than of cantankerous belligerence.
Do not mistake your goals as the only goals; your opinion as the only opinion; your confidence as correctness. Saying you know better is not the same as explaining you know better.

In reply to Re^4: RFC: Object::Proxy (or somesuch) by dragonchild
in thread RFC: Object::Proxy (or somesuch) by dragonchild

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