code: private boolean filterAttribute( final String name ) {
          if ( this.manager == null ) {
              throw new IllegalStateException( "There's no manager set." );
          }
          final Pattern pattern = ((SessionManager)manager).getMemcachedSessionService().getSessionAttributePattern();
          if ( pattern == null ) {
              return true;
          }
          return pattern.matcher(name).matches();
      }
docs: Check whether the given attribute name matches our name pattern and shall be stored in memcached.
  
  @return true if the name matches