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The OpenTripPlanner multimodal journey planning system
package org.opentripplanner.model;
import com.google.common.base.Preconditions;
import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.Multimap;
import org.opentripplanner.model.calendar.ServiceDate;
import org.opentripplanner.routing.algorithm.raptor.transit.mappers.TransitLayerUpdater;
import org.opentripplanner.routing.trippattern.TripTimes;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Collection;
import java.util.Comparator;
import java.util.ConcurrentModificationException;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map.Entry;
import java.util.Objects;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;
// this is only currently in edgetype because that's where Trippattern is.
// move these classes elsewhere.
/**
* Part of concurrency control for stoptime updates.
*
* All updates should be performed on a snapshot before it is handed off to any searches.
* A single snapshot should be used for an entire search, and should remain unchanged
* for that duration to provide a consistent view not only of trips that have been boarded, but of
* relative arrival and departure times of other trips that have not necessarily been boarded.
*
* At this point, only one writing thread at a time is supported.
*
* TODO OTP2 - Move this to package: org.opentripplanner.model
* - after ass Entur NeTEx PRs are merged.
*/
public class TimetableSnapshot {
protected static class SortedTimetableComparator implements Comparator {
@Override
public int compare(Timetable t1, Timetable t2) {
return t1.serviceDate.compareTo(t2.serviceDate);
}
}
/**
* Class to use as key in HashMap containing feed id, trip id and service date
* TODO shouldn't this be a static class?
*/
protected class TripIdAndServiceDate {
private final FeedScopedId tripId;
private final ServiceDate serviceDate;
public TripIdAndServiceDate(final FeedScopedId tripId, final ServiceDate serviceDate) {
this.tripId = tripId;
this.serviceDate = serviceDate;
}
public FeedScopedId getTripId() {
return tripId;
}
public ServiceDate getServiceDate() {
return serviceDate;
}
@Override
public int hashCode() {
int result = Objects.hash(tripId, serviceDate);
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
TripIdAndServiceDate other = (TripIdAndServiceDate) obj;
boolean result = Objects.equals(this.tripId, other.tripId) &&
Objects.equals(this.serviceDate, other.serviceDate);
return result;
}
}
private static final Logger LOG = LoggerFactory.getLogger(TimetableSnapshot.class);
/**
* The timetables for different days, for each TripPattern (each sequence of stops on a particular Route) for which
* we have an updated Timetable. The keys include both TripPatterns from the scheduled GTFS, and TripPatterns added
* by realtime messages and tracked by the TripPatternCache. Note that the keys will not include all scheduled
* TripPatterns, only those for which we've got an update.
* We use a HashMap rather than a Map so we can clone it. If this turns out to be slow/spacious we can use an array
* with integer pattern indexes. The SortedSet members are copy-on-write.
* FIXME: this could be made into a flat hashtable with compound keys.
*/
private HashMap> timetables = new HashMap();
/**
*
* Map containing the last added trip pattern given a trip id (without agency) and a
* service date as a result of a call to {@link #update(TripPattern, TripTimes, ServiceDate)}
* with trip times of a trip that didn't exist yet in the trip pattern.
*
*
* This is a HashMap and not a Map so the clone function is available.
*
* TODO clarify what it means to say "last" added trip pattern. There can be more than one? What happens to the older ones?
*/
private HashMap lastAddedTripPattern = new HashMap<>();
/**
* This maps contains all of the new or updated TripPatterns added by realtime data indexed on
* stop. This has to be kept in order for them to be included in the stop times api call on a
* specific stop.
*
* TODO Find a generic way to keep all realtime indexes.
*/
private Multimap patternsForStop = ArrayListMultimap.create();
/**
* Boolean value indicating that timetable snapshot is read only if true. Once it is true, it shouldn't
* be possible to change it to false anymore.
*/
private boolean readOnly = false;
/**
* Boolean value indicating that this timetable snapshot contains changes compared to the state
* of the last commit if true.
*/
private boolean dirty = false;
/**
* A set of all timetables which have been modified and are waiting to be indexed. When
* dirty is null, it indicates that the snapshot is read-only.
*/
private Set dirtyTimetables = new HashSet<>();
/**
* Returns an updated timetable for the specified pattern if one is available in this snapshot,
* or the originally scheduled timetable if there are no updates in this snapshot.
*/
public Timetable resolve(TripPattern pattern, ServiceDate serviceDate) {
SortedSet sortedTimetables = timetables.get(pattern);
if(sortedTimetables != null && serviceDate != null) {
for(Timetable timetable : sortedTimetables) {
if (timetable != null && timetable.isValidFor(serviceDate)) {
return timetable;
}
}
}
return pattern.scheduledTimetable;
}
/**
* Get the last added trip pattern given a trip id (without agency) and a service date as
* a result of a call to {@link #update(TripPattern, TripTimes, ServiceDate)} with trip times of
* a trip that didn't exist yet in the trip pattern.
* TODO clarify what it means to say "last" added trip pattern. There can be more than one? What happens to the older ones?
*
* @param tripId trip id
* @param serviceDate service date
* @return last added trip pattern; null if trip never was added to a trip pattern
*/
public TripPattern getLastAddedTripPattern(FeedScopedId tripId, ServiceDate serviceDate) {
TripIdAndServiceDate tripIdAndServiceDate = new TripIdAndServiceDate(tripId, serviceDate);
TripPattern pattern = lastAddedTripPattern.get(tripIdAndServiceDate);
return pattern;
}
/**
* Update the trip times of one trip in a timetable of a trip pattern. If the trip of the trip
* times does not exist yet in the timetable, add it.
*
* @param pattern trip pattern
* @param updatedTripTimes updated trip times
* @param serviceDate service day for which this update is valid
* @return whether or not the update was actually applied
*/
public boolean update(TripPattern pattern, TripTimes updatedTripTimes, ServiceDate serviceDate) {
// Preconditions
Preconditions.checkNotNull(pattern);
Preconditions.checkNotNull(serviceDate);
if (readOnly) {
throw new ConcurrentModificationException("This TimetableSnapshot is read-only.");
}
Timetable tt = resolve(pattern, serviceDate);
// we need to perform the copy of Timetable here rather than in Timetable.update()
// to avoid repeatedly copying in case several updates are applied to the same timetable
if ( ! dirtyTimetables.contains(tt)) {
Timetable old = tt;
tt = new Timetable(tt, serviceDate);
SortedSet sortedTimetables = timetables.get(pattern);
if(sortedTimetables == null) {
sortedTimetables = new TreeSet<>(new SortedTimetableComparator());
} else {
SortedSet temp =
new TreeSet<>(new SortedTimetableComparator());
temp.addAll(sortedTimetables);
sortedTimetables = temp;
}
if(old.serviceDate != null)
sortedTimetables.remove(old);
sortedTimetables.add(tt);
timetables.put(pattern, sortedTimetables);
dirtyTimetables.add(tt);
dirty = true;
}
// Assume all trips in a pattern are from the same feed, which should be the case.
// Find trip index
int tripIndex = tt.getTripIndex(updatedTripTimes.trip.getId());
if (tripIndex == -1) {
// Trip not found, add it
tt.addTripTimes(updatedTripTimes);
// Remember this pattern for the added trip id and service date
FeedScopedId tripId = updatedTripTimes.trip.getId();
TripIdAndServiceDate tripIdAndServiceDate = new TripIdAndServiceDate(tripId, serviceDate);
lastAddedTripPattern.put(tripIdAndServiceDate, pattern);
} else {
// Set updated trip times of trip
tt.setTripTimes(tripIndex, updatedTripTimes);
}
// To make these trip patterns visible for departureRow searches.
addPatternToIndex(pattern);
// The time tables are finished during the commit
return true;
}
/**
* This produces a small delay of typically around 50ms, which is almost entirely due to
* the indexing step. Cloning the map is much faster (2ms).
* It is perhaps better to index timetables as they are changed to avoid experiencing all
* this lag at once, but we want to avoid re-indexing when receiving multiple updates for
* the same timetable in rapid succession. This compromise is expressed by the
* maxSnapshotFrequency property of StoptimeUpdater. The indexing could be made much more
* efficient as well.
* @return an immutable copy of this TimetableSnapshot with all updates applied
*/
public TimetableSnapshot commit() {
return commit(null, false);
}
@SuppressWarnings("unchecked")
public TimetableSnapshot commit(TransitLayerUpdater transitLayerUpdater, boolean force) {
if (readOnly) {
throw new ConcurrentModificationException("This TimetableSnapshot is read-only.");
}
TimetableSnapshot ret = new TimetableSnapshot();
if (!force && !this.isDirty()) return null;
for (Timetable tt : dirtyTimetables) {
tt.finish(); // summarize, index, etc. the new timetables
}
ret.timetables = (HashMap>) this.timetables.clone();
ret.lastAddedTripPattern = (HashMap)
this.lastAddedTripPattern.clone();
if (transitLayerUpdater != null) {
transitLayerUpdater.update(dirtyTimetables);
}
this.dirtyTimetables.clear();
this.dirty = false;
ret.setPatternsForStop(HashMultimap.create(this.patternsForStop));
ret.readOnly = true; // mark the snapshot as henceforth immutable
return ret;
}
/**
* Clear all data of snapshot for the provided feed id
*
* @param feedId feed id to clear the snapshop for
*/
public void clear(String feedId) {
if (readOnly) {
throw new ConcurrentModificationException("This TimetableSnapshot is read-only.");
}
// Clear all data from snapshot.
boolean timetableWasModified = clearTimetable(feedId);
boolean lastAddedWasModified = clearLastAddedTripPattern(feedId);
// If this snapshot was modified, it will be dirty after the clear actions.
if (timetableWasModified || lastAddedWasModified) {
dirty = true;
}
}
/**
* Clear timetable for all patterns matching the provided feed id.
*
* @param feedId feed id to clear out
* @return true if the timetable changed as a result of the call
*/
protected boolean clearTimetable(String feedId) {
return timetables.keySet().removeIf(tripPattern -> feedId.equals(tripPattern.getFeedId()));
}
/**
* Clear all last added trip patterns matching the provided feed id.
*
* @param feedId feed id to clear out
* @return true if the lastAddedTripPattern changed as a result of the call
*/
protected boolean clearLastAddedTripPattern(String feedId) {
return lastAddedTripPattern.keySet().removeIf(
lastAddedTripPattern ->
feedId.equals(lastAddedTripPattern.getTripId().getFeedId())
);
}
/**
* Removes all Timetables which are valid for a ServiceDate on-or-before the one supplied.
*/
public boolean purgeExpiredData(ServiceDate serviceDate) {
if (readOnly) {
throw new ConcurrentModificationException("This TimetableSnapshot is read-only.");
}
boolean modified = false;
for (Iterator it = timetables.keySet().iterator(); it.hasNext();){
TripPattern pattern = it.next();
SortedSet sortedTimetables = timetables.get(pattern);
SortedSet toKeepTimetables =
new TreeSet(new SortedTimetableComparator());
for(Timetable timetable : sortedTimetables) {
if(serviceDate.compareTo(timetable.serviceDate) < 0) {
toKeepTimetables.add(timetable);
} else {
modified = true;
}
}
if(toKeepTimetables.isEmpty()) {
it.remove();
} else {
timetables.put(pattern, toKeepTimetables);
}
}
// Also remove last added trip pattern for days that are purged
for (Iterator> iterator = lastAddedTripPattern
.entrySet().iterator(); iterator.hasNext();) {
TripIdAndServiceDate tripIdAndServiceDate = iterator.next().getKey();
if (serviceDate.compareTo(tripIdAndServiceDate.getServiceDate()) >= 0) {
iterator.remove();
modified = true;
}
}
return modified;
}
public boolean isDirty() {
if (readOnly) return false;
return dirty;
}
public String toString() {
String d = readOnly ? "committed" : String.format("%d dirty", dirtyTimetables.size());
return String.format("Timetable snapshot: %d timetables (%s)", timetables.size(), d);
}
/**
* @return all TripPatterns for which we have any updated timetables created by realtime messages, including both
* patterns that were in the scheduled (static) transit data and those that were added to this snapshot by
* rerouted or added trips.
*/
public Collection getAllRealtimeTripPatterns () {
return timetables.keySet();
}
private void addPatternToIndex(TripPattern tripPattern) {
for (Stop stop: tripPattern.getStops()) {
patternsForStop.put(stop, tripPattern);
}
}
public Collection getPatternsForStop(Stop stop) {
return patternsForStop.get(stop);
}
public void setPatternsForStop(Multimap patternsForStop) {
this.patternsForStop = patternsForStop;
}
}
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