/**
  * Record a trace log for the result of {@link #match(FlowMatchContext)}.
  *
  * @param ctx A {@link FlowMatchContext} instance.
  * @param msg A message to be logged.
  * @param vfmatch A {@link VTNFlowMatch} instance that matched the packet.
  */
 private void traceMatch(FlowMatchContext ctx, String msg, VTNFlowMatch vfmatch) {
   if (LOG.isTraceEnabled()) {
     LOG.trace(
         "{}: {}: match=[{}], packet=[{}]",
         name,
         msg,
         vfmatch.getConditionKey(),
         ctx.getHeaderDescription());
   }
 }
 /**
  * Record a trace log for the result of {@link #match(FlowMatchContext)}.
  *
  * @param ctx A {@link FlowMatchContext} instance.
  * @param msg A message to be logged.
  */
 private void traceMatch(FlowMatchContext ctx, String msg) {
   if (LOG.isTraceEnabled()) {
     LOG.trace("{}: {}: packet=[{}]", name, msg, ctx.getHeaderDescription());
   }
 }