code: public long getWorkspaceDataSize(String repositoryName, String workspaceName) throws UnknownDataSizeException
     {
        String wsUniqueName = composeWorkspaceUniqueName(repositoryName, workspaceName);
        CacheKey key = new WorkspaceDataSizeKey(wsUniqueName);
  
        return getDataSize(key);
     }
docs: {@inheritDoc}