Singleton classes


#1

I’m trying to implement the singleton design in some classes. According
to ruby-doc.org[1] page on singletons, it should be fairly
straightforward.

Unfortunately, I’m running into problems. Take the following
declaration:

class Config
require ‘yaml’
include Singleton


end

When trying to use the class I get:

uninitialized constant Config::Singleton (NameError)

Also, I am not sure how to change from using the initialize method.
Normally, the Config class is initialized with a username, and then
provides methods to load/save, add/delete config directives.

Any tips on converting this class much apprecited.

Thanks

Matt


#2

Matt H. wrote:


Any tips on converting this class much apprecited.

Thanks

Matt

require ‘singleton’

will take care of the first issue. As far as how to pass in arguments to
initialize the instance, I played around with it a little but didn’t see
an obvious way of doing it.

-Justin


#3

Justin C. wrote:

require ‘singleton’

will take care of the first issue. As far as how to pass in arguments to
initialize the instance, I played around with it a little but didn’t see
an obvious way of doing it.

-Justin

Excellent, thanks. I think the docs for that class could be a little
clearer.

As for the initialize problem, I just moved the code from that method
into a normal method. So where in initialize it took a filename and
opened the file, I just moved that into a “load” method.

Thanks for the help.

Matt


#4

unsubscribe