My intuition tells me that you've invented "data thingies" that don't actually map into real world objects, and thus their roles are muddy (at least in your description).

I'd suggest you go back to role-playing the real task, and seeing who needs to talk to what. In general, a "manager object" is a very bad idea, especially when it turns out to be a singleton. You've just thrown away most of the advantages of OO when you get to that point.

For example, the LWP::UserAgent class might at first glance appear to be a "manager object", but it's really an object that maps to a particular browser, which is a real thing. And just as you can have multiple browsers, on your desktop, you can have multiple instances of LWP::UserAgent in your program.

So, rethink your problem from the perspective of actors, not data, and your need for a "Primary object" will probably go away or take on an obvious new role. Such is the OO way.

-- Randal L. Schwartz, Perl hacker

In reply to •Re: Cross-Package/Object Communication by merlyn
in thread Cross-Package/Object Communication by billyak

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