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Overall, I think my decision to put observer lists into the objects is a good one
In many ways, it simplifies the code
It certainly clears up a bunch of nasty and otherwise insoluble bugs
But in some ways it complicates things
For example, Class::Observable allows:
Alarm->add_observer($guard);
$alarm = Alarm->new();
$alarm->notify_observers(...); # Notifies $guard
Where to store the observers for class Alarm?
Answer: In a package variable in the class
But object member data and package variables are accessed differently
This was not a problem when it all went into %O
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Copyright © 2006 M. J. Dominus |