Singleton class for mod_perl
Apache::Singleton is a Perl module that provides a Singleton class suitable for use with mod_perl.
A Singleton describes an object class that can have only one instance in any system. An example of a Singleton might be a print spooler or system registry.
For a description and discussion of the Singleton class, see "Design Patterns", Gamma et al, Addison-Wesley, 1995, ISBN 0-201-63361-2.
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