@Override
  public boolean equals(Object o) {
    if (this == o) return true;
    if (o == null || getClass() != o.getClass()) return false;
    ExternalSystemEvent event = (ExternalSystemEvent)o;
    return myTimestamp == event.myTimestamp &&
           myEventType == event.myEventType;
  }
@Override
  public boolean equals(Object o)