@Override
 public int hashCode() {
   final int prime = 31;
   int result = super.hashCode();
   result = prime * result + ((queueName == null) ? 0 : queueName.hashCode());
   return result;
 }
 @Override
 public int hashCode() {
   final int prime = 31;
   int result = super.hashCode();
   result = prime * result + ((address == null) ? 0 : address.hashCode());
   result = prime * result + credits;
   return result;
 }