code: protected void accumulatePersistedWorkspaceChanges(long delta) throws QuotaManagerException
     {
        long dataSize = 0;
        try
        {
           dataSize = quotaPersister.getWorkspaceDataSize(rName, wsName);
        }
        catch (UnknownDataSizeException e)
        {
           if (LOG.isTraceEnabled())
           {
              LOG.trace(e.getMessage(), e);
           }
        }
  
        long newDataSize = Math.max(dataSize + delta, 0); // avoid possible inconsistency
        quotaPersister.setWorkspaceDataSize(rName, wsName, newDataSize);
     }
docs: Update workspace data size.