# in MyApp.pm
__PACKAGE__->config(
          "Plugin::Cache" => {
              backend => {
                  class  => "Cache::MemoryCache",
              }
          });

# in MyApp::Controller::Root
sub counter :Local Args(0) {
    my ( $self, $c ) = @_;
    my $counter = $c->cache->get("counter") + 1;
    $c->cache->set( counter => $counter );
    $c->response->body("Count #" . $counter);
}