code: def _GetProcessedStorageFilePath(self, task):
      
      filename = '{0:s}.plaso'.format(task.identifier)
      return os.path.join(self._processed_task_storage_path, filename)
docs: Retrieves the path of a task storage file in the processed directory.
  
      Args:
        task (Task): task.
  
      Returns:
        str: path of a task storage file in the processed directory.