Following the discussion about "root" yesterday, it got me thinking
about a constant problem I face.
Object-A needs to listen to events coming from objects B, C and D, but
only if and when these objects actually exist. There's no guarantee
that any of the objects B, C and D will be instantiated before or after
A is instantiated. So, what's the proper way for A to add itself as a
listener to B, C and D?
What I'm currently do is this:
The event dispatchers (B, C, D etc) implement a singleton interface.
Within the target (A), I set up a Timer event to repeatedly check
for instances of the dispatchers. Once a dispatcher is found, the
target adds itself as a listener, and a pointer to the dispatcher is
created so that the target can later remove itself.
I'm not very happy with this design, but it's the best that I've been
able to come up with.
Thanks!
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