Chris,
I confess, I'm also puzzled about your dislike of singletons. Used
properly, they can be very useful. Do you have objections about their
use in specific circumstances, or in general? If it's in general, I'm
interested in understanding why. It's quite possible that I'm behind in
current thinking about their use, and I'm always interested in learning
more.
I've certainly seen places where singletons have been abused, which can
lead to big problems, since some people treat them as permission to
establish all kinds of essentially global variables. I've found them to
be pretty useful, as long as I only used them where they fit the problem
I was trying to solve.
Thanks,
Ray
Dimitry Polivaev wrote:
Hi Chris,
first of all, when I write "singletons" I mean that we do not need
multiple instances of the mode controllers with corresponding actions
and listeners. It does not mean that the classes should implement the
singleton pattern. But I do not see any preferences of creating all
those objects each time we create a new map view or load a new map.
Further I have read that you do not like the singletons. But I still do
not see what you find wrong about them. I have to admit that I can not
follow you and understand you properly because you neither explain what
you mean nor tell me any arguments. I am even not sure, whether you
think that we need many controller instances and what reasons you could
have for it. So if you want that I understand you and come to you, you
could write a bit more.
Your appeal to read "good literature" does not make your position any
bit clearer either. But if you like to recommend me some good book, you
can always do it.
Regards, Dimitry
Hi Dimitry,
as I already anounced, I don't support more singletons. Please read
any good literature on MVC pattern and you'll see that none of them
needs any singletons to be successful.
Regards, Chris
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