/**
  * Is the key in the negative lookup cache?
  *
  * @since 0.9.4
  */
 boolean isNegativeCached(Hash key) {
   boolean rv = _negativeCache.isCached(key);
   if (rv) _context.statManager().addRateData("netDb.negativeCache", 1);
   return rv;
 }
 /**
  * Increment in the negative lookup cache
  *
  * @since 0.9.4
  */
 void lookupFailed(Hash key) {
   _negativeCache.lookupFailed(key);
 }