@Override
  public int hashCode() {
    int result = clusterName != null ? clusterName.hashCode() : 0;
    result = 31 * result + (serviceName != null ? serviceName.hashCode() : 0);
    return result;
  }
Contains info about service update. This update will be sent to all subscribed recipients.
ambari-server/src/main/java/org/apache/ambari/server/events/ServiceUpdateEvent.java