docs: protected void payloadWritten(int payloadSize)
      {
          if (tc.isEntryEnabled())
              Tr.entry(tc, "payloadWritten", new Object[] { this, payloadSize });
  
          _unwrittenDataSize.addAndGet(-payloadSize);
  
          if (tc.isDebugEnabled())
              Tr.debug(tc, "unwrittenDataSize = " + _unwrittenDataSize.get() + " totalDataSize = " + _totalDataSize);
          if (tc.isEntryEnabled())
              Tr.exit(tc, "payloadWritten");
      }