Loads all events added since the last call to `Reload`.

    If `Reload` was never called, loads all events in the file.

    Returns:
      The `EventAccumulator`.

def Reload(self):
    """Loads all events added since the last call to `Reload`.

    If `Reload` was never called, loads all events in the file.

    Returns:
      The `EventAccumulator`.
    """
    with self._generator_mutex:
      for event in self._generator.Load():
        self._ProcessEvent(event)
    return self