in long-ride-alerts/src/solution/java/org/apache/flink/training/solutions/longrides/LongRidesSolution.java [107:111]
public void open(Configuration config) {
ValueStateDescriptor<TaxiRide> rideStateDescriptor =
new ValueStateDescriptor<>("ride event", TaxiRide.class);
rideState = getRuntimeContext().getState(rideStateDescriptor);
}