Install libapache-singleton-perl by entering the following commands in the terminal:
sudo apt update sudo apt install libapache-singleton-perl
Description:
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.
Homepage: https://metacpan.org/release/Apache-Singleton
Version: 0.17-1
Section: universe/perl