What about just using Cache::FileCache or similar?

use Cache::FileCache;
sub methodname {
  my $self = shift;
  my $value = shift;  # optional
  my $cacheKey = "methodname - $self';  # or use $self->id or similar 
+if there is one -- just something unique for this method & instance
  my $cache = new Cache::FileCache( { namespace=>"YourStuff" } );
  if( defined $value ){
    $cache->set( $cacheKey, $value, "10 minutes" );  # this could be N
+EVER_EXPIRE, too
  }
  my $result = $cache->get($key);
  return $result if defined $result;

  # do actual 'methodname' calculations here.
 
  # optionally cache the result:
  # $cache->set( $cacheKey, $value, "10 minutes" );
}
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