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