docs: @Override
      public void add(int arg0, Object arg1) {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              JmfTr.entry(this, tc, "add", new Object[] { Integer.valueOf(arg0), arg1 });
  
          synchronized (getMessageLockArtefact()) {
              super.add(arg0, arg1);
          }
  
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              JmfTr.exit(this, tc, "add");
      }