Improve handling of realtime updated StopPatterns

application/src/main/java/org/opentripplanner/routing/algorithm/raptoradapter/transit/mappers/RealTimeRaptorTransitDataUpdater.java

@@ -66,6 +66,31 @@ public RealTimeRaptorTransitDataUpdater(TimetableRepository timetableRepository)
     this.timetableRepository = timetableRepository;
   }
 
+  /// Updates the real-time [RaptorTransitData] to use the modified timetables.
+  ///
+  /// This method bridges the different update approaches:
+  /// 1. `updatedTimetables` and `timetables` only contains [Timetable]s with real-time
+  ///    updates. This means that removed items are not present.
+  /// 2. [RaptorTransitData] requires applying the changes to a previous snapshot: adding,
+  ///    updating and removing timetables.
+  ///
+  /// To support this the method has three tasks:
+  /// 1. Collect [TripPatternForDate]s which have invalidated data (`oldTripPatternsForDate`).
+  ///    Trips may change in multiple ways and because of that may move between [TripPattern]s. To
+  ///    track a [TripIdAndServiceDate] it's previous state needs to be stored so that all relevant
+  ///    places may be updated.
+  ///      * a trip may have a new (real-time) Timetable, which results in two updated [Timetable]s
+  ///      * a trip may move between scheduled [StopPattern]s and/or real-time [StopPattern]s
+  /// 2. Collect [TripPatternForDate]s which have valid data (`newTripPatternsForDate`).
+  ///    There are two options:
+  ///    1. an update was received
+  ///    2. no update was received, and so the previous updated should be removed. If the update
+  ///       was for a scheduled trip, then the schedule should be restored.
+  /// 3. Remove the `oldTripPatternsForDate` and add the `newTripPatternsForDate` to the
+  ///    [RaptorTransitData].
+  ///
+  /// @param updatedTimetables that changed with the current snapshot
+  /// @param timetables which are affected by real-time updates
   public void update(
     Collection<Timetable> updatedTimetables,
     Map<TripPattern, SortedSet<Timetable>> timetables
@@ -204,7 +229,8 @@ public void update(
               patternsForDate.remove(tripPatternForDate);
             }
           } else {
-            LOG.warn("Could not fetch timetable for {}", pattern);
+            LOG.warn("Could not fetch timetable for {}, removing.", pattern);
+            patternsForDate.remove(tripPatternForDate);
           }
         }
       }

application/src/main/java/org/opentripplanner/updater/trip/gtfs/TripTimesUpdater.java

@@ -15,6 +15,7 @@
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
 import java.util.Optional;
 import java.util.OptionalInt;
 import javax.annotation.Nullable;
@@ -132,10 +133,26 @@ public static Result<TripTimesPatch, UpdateError> createUpdatedTripTimesFromGtfs
       }
 
       if (match) {
-        update.stopHeadsign().ifPresent(x -> builder.withStopHeadsign(index, x));
-        update.pickup().ifPresent(x -> updatedPickups.put(index, x));
-        update.dropoff().ifPresent(x -> updatedDropoffs.put(index, x));
-        update.assignedStopId().ifPresent(x -> replacedStopIndices.put(index, x));
+        var scheduledStopId = timetable.getPattern().getStop(i).getId().getId();
+        var scheduledStopHeadsign = tripTimes.getHeadsign(i);
+        var scheduledPickup = timetable.getPattern().getBoardType(i);
+        var scheduledDropoff = timetable.getPattern().getAlightType(i);
+        update
+          .stopHeadsign()
+          .filter(x -> !Objects.equals(x, scheduledStopHeadsign))
+          .ifPresent(x -> builder.withStopHeadsign(index, x));
+        update
+          .pickup()
+          .filter(x -> x != scheduledPickup)
+          .ifPresent(x -> updatedPickups.put(index, x));
+        update
+          .dropoff()
+          .filter(x -> x != scheduledDropoff)
+          .ifPresent(x -> updatedDropoffs.put(index, x));
+        update
+          .assignedStopId()
+          .filter(x -> !Objects.equals(x, scheduledStopId))
+          .ifPresent(x -> replacedStopIndices.put(index, x));
 
         var scheduleRelationship = update.scheduleRelationship();
         // Handle each schedule relationship case

application/src/test/java/org/opentripplanner/transit/model/_data/TestTransitTuningParameters.java

@@ -0,0 +1,40 @@
+package org.opentripplanner.transit.model._data;
+
+import java.time.Duration;
+import java.util.List;
+import org.opentripplanner.routing.algorithm.raptoradapter.transit.TransitTuningParameters;
+import org.opentripplanner.routing.api.request.RouteRequest;
+import org.opentripplanner.transit.model.site.StopTransferPriority;
+
+class TestTransitTuningParameters implements TransitTuningParameters {
+
+  @Override
+  public boolean enableStopTransferPriority() {
+    return false;
+  }
+
+  @Override
+  public Integer stopBoardAlightDuringTransferCost(StopTransferPriority key) {
+    return 0;
+  }
+
+  @Override
+  public int transferCacheMaxSize() {
+    return 0;
+  }
+
+  @Override
+  public Duration maxSearchWindow() {
+    return null;
+  }
+
+  @Override
+  public List<Duration> pagingSearchWindowAdjustments() {
+    return List.of();
+  }
+
+  @Override
+  public List<RouteRequest> transferCacheRequests() {
+    return List.of();
+  }
+}

application/src/test/java/org/opentripplanner/transit/model/_data/TransitTestEnvironment.java

@@ -6,6 +6,9 @@
 import java.time.ZoneId;
 import org.opentripplanner.LocalTimeParser;
 import org.opentripplanner.model.TimetableSnapshot;
+import org.opentripplanner.routing.algorithm.raptoradapter.transit.RaptorTransitData;
+import org.opentripplanner.routing.algorithm.raptoradapter.transit.mappers.RaptorTransitDataMapper;
+import org.opentripplanner.routing.algorithm.raptoradapter.transit.mappers.RealTimeRaptorTransitDataUpdater;
 import org.opentripplanner.transit.service.DefaultTransitService;
 import org.opentripplanner.transit.service.TimetableRepository;
 import org.opentripplanner.transit.service.TransitService;
@@ -40,8 +43,14 @@ public static TransitTestEnvironmentBuilder of(LocalDate serviceDate, ZoneId tim
     this.timetableRepository = timetableRepository;
 
     this.timetableRepository.index();
+    this.timetableRepository.setRaptorTransitData(
+        RaptorTransitDataMapper.map(new TestTransitTuningParameters(), timetableRepository)
+      );
+    this.timetableRepository.setRealtimeRaptorTransitData(
+        new RaptorTransitData(timetableRepository.getRaptorTransitData())
+      );
     this.snapshotManager = new TimetableSnapshotManager(
-      null,
+      new RealTimeRaptorTransitDataUpdater(timetableRepository),
       TimetableSnapshotParameters.PUBLISH_IMMEDIATELY,
       () -> defaultServiceDate
     );

application/src/test/java/org/opentripplanner/updater/trip/GtfsRtTestHelper.java

@@ -3,6 +3,7 @@
 import static org.opentripplanner.updater.trip.UpdateIncrementality.FULL_DATASET;
 
 import com.google.transit.realtime.GtfsRealtime;
+import java.time.LocalDate;
 import java.util.List;
 import org.opentripplanner.transit.model._data.TransitTestEnvironment;
 import org.opentripplanner.updater.spi.UpdateResult;
@@ -20,7 +21,7 @@ public class GtfsRtTestHelper {
     this.gtfsAdapter = new GtfsRealTimeTripUpdateAdapter(
       transitTestEnvironment.timetableRepository(),
       transitTestEnvironment.timetableSnapshotManager(),
-      () -> transitTestEnvironment.defaultServiceDate()
+      transitTestEnvironment::defaultServiceDate
     );
   }
 
@@ -32,13 +33,29 @@ public TripUpdateBuilder tripUpdateScheduled(String tripId) {
     return tripUpdate(tripId, GtfsRealtime.TripDescriptor.ScheduleRelationship.SCHEDULED);
   }
 
+  public TripUpdateBuilder tripUpdateScheduled(String tripId, LocalDate serviceDate) {
+    return tripUpdate(
+      tripId,
+      serviceDate,
+      GtfsRealtime.TripDescriptor.ScheduleRelationship.SCHEDULED
+    );
+  }
+
+  public TripUpdateBuilder tripUpdate(
+    String tripId,
+    GtfsRealtime.TripDescriptor.ScheduleRelationship scheduleRelationship
+  ) {
+    return tripUpdate(tripId, transitTestEnvironment.defaultServiceDate(), scheduleRelationship);
+  }
+
   public TripUpdateBuilder tripUpdate(
     String tripId,
+    LocalDate serviceDate,
     GtfsRealtime.TripDescriptor.ScheduleRelationship scheduleRelationship
   ) {
     return new TripUpdateBuilder(
       tripId,
-      transitTestEnvironment.defaultServiceDate(),
+      serviceDate,
       scheduleRelationship,
       transitTestEnvironment.timeZone()
     );
@@ -55,6 +72,10 @@ public UpdateResult applyTripUpdate(
     return applyTripUpdates(List.of(update), incrementality);
   }
 
+  public UpdateResult applyTripUpdates(List<GtfsRealtime.TripUpdate> updates) {
+    return applyTripUpdates(updates, FULL_DATASET);
+  }
+
   public UpdateResult applyTripUpdates(
     List<GtfsRealtime.TripUpdate> updates,
     UpdateIncrementality incrementality

application/src/test/java/org/opentripplanner/updater/trip/RealtimeTestConstants.java

@@ -10,4 +10,5 @@ public interface RealtimeTestConstants {
   String STOP_B_ID = "B";
   String STOP_C_ID = "C";
   String STOP_D_ID = "D";
+  String STOP_E_ID = "E";
 }