if (log.isTraceEnabled()) { log.trace(this + " added " + d + " to memory"); }
if (trace) { log.trace(this + " added " + d + " to memory"); }
   public void addDelivery(Delivery d) throws Throwable   {      deliveries.add(d);      if (log.isTraceEnabled()) { log.trace(this + " added " + d + " to memory"); }   }