package MyClass;
use strict;
use Log::Log4Perl;

# this tells perl to look in Log::Log4Perl for methods
@MyClass::ISA = qw(Log::Log4Perl);

# now override methods with your own ones.
# all else is found looked up in packages in
# @MyClass::ISA

sub error {
    ...
}
sub info {
    ...
}
1;