docs: public final void incrementLocked(int sizeInBytes) throws SevereMessageStoreException
      {
          boolean doCallback = false;
  
          synchronized(this)
          {
              _countLocked++;
  
              doCallback = _incrementTotal(sizeInBytes);
          }
  
          if (doCallback)
          {
              _owningStreamLink.eventWatermarkBreached();
          }
      }