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Migrate to java

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Andras Schmelczer 2026-02-11 21:33:14 +00:00
parent 1588c01b19
commit dccc1e439d
8 changed files with 243 additions and 192 deletions
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r5-java/src/main/java/propertymap/App.java Normal file
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package propertymap;
import com.conveyal.r5.analyst.FreeFormPointSet;
import com.conveyal.r5.analyst.TravelTimeComputer;
import com.conveyal.r5.analyst.cluster.RegionalTask;
import com.conveyal.r5.api.util.LegMode;
import com.conveyal.r5.api.util.TransitModes;
import com.conveyal.r5.transit.TransportNetwork;
import com.google.gson.Gson;
import io.javalin.Javalin;
import io.javalin.http.Context;
import java.io.File;
import java.time.LocalDate;
import java.util.EnumSet;
public class App {
private static TransportNetwork network;
private static final Gson gson = new Gson();
static class TravelTimeRequest {
double[] origin; // [lat, lon]
double[][] destinations; // [[lat, lon], ...]
String mode; // "transit", "car", "bicycle", "walking"
}
static class TravelTimeResponse {
double[] travel_times; // minutes, -1 = unreachable
}
public static void main(String[] args) throws Exception {
String dataDir = System.getenv("DATA_DIR");
if (dataDir == null) dataDir = "/data/transit";
String networkCacheDir = System.getenv("NETWORK_CACHE_DIR");
if (networkCacheDir == null) networkCacheDir = "/data/network";
System.out.println("Loading transport network from " + dataDir);
System.out.println("Network cache dir: " + networkCacheDir);
File cacheFile = new File(networkCacheDir, "network.dat");
if (cacheFile.exists()) {
System.out.println("Loading cached network from " + cacheFile);
network = TransportNetwork.read(cacheFile);
} else {
System.out.println("Building network (first run, this takes a few minutes)...");
network = TransportNetwork.fromDirectory(new File(dataDir));
new File(networkCacheDir).mkdirs();
network.write(cacheFile);
System.out.println("Network cached to " + cacheFile);
}
System.out.println("Transport network loaded successfully");
Javalin app = Javalin.create().start(8003);
app.get("/health", ctx -> ctx.result("ok"));
app.post("/travel-times", App::handleTravelTimes);
System.out.println("R5 service listening on port 8003");
}
private static void handleTravelTimes(Context ctx) {
long t0 = System.currentTimeMillis();
TravelTimeRequest req = gson.fromJson(ctx.body(), TravelTimeRequest.class);
if (req.origin == null || req.origin.length != 2) {
ctx.status(400).result("origin must be [lat, lon]");
return;
}
if (req.destinations == null || req.destinations.length == 0) {
ctx.status(400).result("destinations must be non-empty array of [lat, lon]");
return;
}
String mode = req.mode != null ? req.mode : "transit";
// Build destination point set
double[] lats = new double[req.destinations.length];
double[] lons = new double[req.destinations.length];
for (int i = 0; i < req.destinations.length; i++) {
lats[i] = req.destinations[i][0];
lons[i] = req.destinations[i][1];
}
FreeFormPointSet destinations = new FreeFormPointSet(lats, lons);
// Build the regional task
RegionalTask task = new RegionalTask();
task.fromLat = req.origin[0];
task.fromLon = req.origin[1];
task.date = LocalDate.now();
task.percentiles = new int[]{50};
task.monteCarloDraws = 1;
switch (mode) {
case "car":
task.fromTime = 8 * 3600;
task.toTime = 8 * 3600 + 60;
task.maxTripDurationMinutes = 120;
task.accessModes = EnumSet.of(LegMode.CAR);
task.egressModes = EnumSet.of(LegMode.CAR);
task.directModes = EnumSet.of(LegMode.CAR);
task.transitModes = EnumSet.noneOf(TransitModes.class);
break;
case "bicycle":
task.fromTime = 8 * 3600;
task.toTime = 8 * 3600 + 60;
task.maxTripDurationMinutes = 90;
task.accessModes = EnumSet.of(LegMode.BICYCLE);
task.egressModes = EnumSet.of(LegMode.BICYCLE);
task.directModes = EnumSet.of(LegMode.BICYCLE);
task.transitModes = EnumSet.noneOf(TransitModes.class);
break;
case "walking":
task.fromTime = 8 * 3600;
task.toTime = 8 * 3600 + 60;
task.maxTripDurationMinutes = 60;
task.accessModes = EnumSet.of(LegMode.WALK);
task.egressModes = EnumSet.of(LegMode.WALK);
task.directModes = EnumSet.of(LegMode.WALK);
task.transitModes = EnumSet.noneOf(TransitModes.class);
break;
default: // transit
task.fromTime = 8 * 3600;
task.toTime = 8 * 3600 + 60; // single RAPTOR sweep
task.maxTripDurationMinutes = 90;
task.maxRides = 4;
task.accessModes = EnumSet.of(LegMode.WALK);
task.egressModes = EnumSet.of(LegMode.WALK);
task.directModes = EnumSet.of(LegMode.WALK);
task.transitModes = EnumSet.allOf(TransitModes.class);
break;
}
// Compute travel times
TravelTimeComputer computer = new TravelTimeComputer(task, network, destinations);
int[][] results = computer.computeTravelTimes();
// results[percentileIdx][destinationIdx] — we only have 1 percentile (index 0)
TravelTimeResponse response = new TravelTimeResponse();
response.travel_times = new double[req.destinations.length];
int[] times = results[0]; // percentile 0 (the 50th percentile)
for (int i = 0; i < req.destinations.length; i++) {
if (i < times.length && times[i] != Integer.MAX_VALUE) {
response.travel_times[i] = times[i]; // already in minutes
} else {
response.travel_times[i] = -1; // unreachable
}
}
long elapsed = System.currentTimeMillis() - t0;
System.out.println("Travel times (" + mode + ") computed for " + req.destinations.length +
" destinations in " + elapsed + "ms");
ctx.json(response);
}
}