sub new {
    my $self = bless {}, shift;
    $self->{log} = Library->log()->child('This::Module::Name');

    my $log = $self->_log()->child('new');
}
sub foo {
    my $self = shift;
    my $log = $self->_log()->child('foo');

    # do fooish type stuff
}
sub _log {
    return shift->{log};
}