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Introduce concept of loading/unloading tiles

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This commit is contained in:
Victor Shcherb 2012-06-13 00:47:54 +02:00
parent 16ff5ef587
commit 3f12b33e78
4 changed files with 290 additions and 138 deletions
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1
DataExtractionOSM/src/net/osmand/binary/BinaryMapRouteReaderAdapter.java
View file

@ -17,7 +17,6 @@ import net.osmand.binary.OsmandOdb.OsmAndRoutingIndex.RouteDataBlock;
import net.osmand.binary.OsmandOdb.OsmAndRoutingIndex.RouteDataBox;
import net.osmand.binary.OsmandOdb.OsmAndRoutingIndex.RouteEncodingRule;
import net.osmand.binary.OsmandOdb.RouteData;
import net.osmand.data.MapAlgorithms;
import net.osmand.osm.MapUtils;
import org.apache.commons.logging.Log;

293
DataExtractionOSM/src/net/osmand/router/BinaryRoutePlanner.java
View file

@ -1,5 +1,6 @@
package net.osmand.router;
import gnu.trove.iterator.TIntObjectIterator;
import gnu.trove.map.hash.TLongObjectHashMap;
import java.io.IOException;
@ -26,6 +27,7 @@ import net.osmand.binary.BinaryMapRouteReaderAdapter.RouteRegion;
import net.osmand.binary.BinaryMapRouteReaderAdapter.RouteSubregion;
import net.osmand.osm.MapRenderingTypes;
import net.osmand.osm.MapUtils;
import net.osmand.router.RoutingContext.RoutingTile;
import org.apache.commons.logging.Log;
@ -90,7 +92,7 @@ public class BinaryRoutePlanner {
int px = MapUtils.get31TileNumberX(lon);
int py = MapUtils.get31TileNumberY(lat);
List<RouteDataObject> dataObjects = new ArrayList<RouteDataObject>();
loadRoutes(ctx, px,py, dataObjects);
RoutingTile tl = loadRoutes(ctx, px,py, dataObjects);
RouteSegment road = null;
double sdist = 0;
@ -122,12 +124,15 @@ public class BinaryRoutePlanner {
if(ro.pointTypes.size() > j) {
ro.pointTypes.add(j, null);
}
registerRouteDataObject(ctx, ro);
sdist = currentsDist;
}
}
}
}
if(road != null) {
// re-register the best road because one more point was inserted
registerRouteDataObject(ctx, road.getRoad(), tl);
}
return road;
}
@ -147,7 +152,6 @@ public class BinaryRoutePlanner {
* return list of segments
*/
public List<RouteSegmentResult> searchRoute(final RoutingContext ctx, RouteSegment start, RouteSegment end) throws IOException {
boolean relaxingStrategy = true;
// measure time
ctx.timeToLoad = 0;
ctx.visitedSegments = 0;
@ -199,7 +203,6 @@ public class BinaryRoutePlanner {
while (!graphSegments.isEmpty()) {
RouteSegment segment = graphSegments.poll();
ctx.visitedSegments++;
// for debug purposes
if (ctx.visitor != null) {
@ -216,7 +219,7 @@ public class BinaryRoutePlanner {
if (graphReverseSegments.isEmpty() || graphDirectSegments.isEmpty() || routeFound) {
break;
}
if(!init) {
if (!init) {
inverse = !inverse;
init = true;
} else if (ctx.planRouteIn2Directions()) {
@ -230,18 +233,21 @@ public class BinaryRoutePlanner {
// different strategy : use onedirectional graph
inverse = !ctx.getPlanRoadDirection().booleanValue();
}
if(inverse) {
if (inverse) {
graphSegments = graphReverseSegments;
} else {
graphSegments = graphDirectSegments;
}
if (relaxingStrategy) {
ctx.relaxedIteration++;
if (ctx.relaxedIteration > 100) {
ctx.relaxedIteration = 0;
ctx.garbageCollectorIteration++;
if (ctx.garbageCollectorIteration > RoutingContext.ITERATIONS_TO_RUN_GC ||
ctx.getCurrentlyLoadedTiles() > 30) {
ctx.garbageCollectorIteration = 0;
if (ctx.isUseRelaxingStrategy()) {
relaxNotNeededSegments(ctx, graphDirectSegments, true);
relaxNotNeededSegments(ctx, graphReverseSegments, false);
}
unloadUnusedTiles(ctx, 30);
}
}
printDebugMemoryInformation(ctx, graphDirectSegments, graphReverseSegments, visitedDirectSegments, visitedOppositeSegments);
@ -251,49 +257,47 @@ public class BinaryRoutePlanner {
}
public static class SegmentStat {
String name;
Set<Float> set = new TreeSet<Float>();
public SegmentStat(String name) {
this.name = name;
private void unloadUnusedTiles(RoutingContext ctx, int desirableSize) {
// now delete all
List<RoutingTile> list = new ArrayList<RoutingContext.RoutingTile>();
TIntObjectIterator<RoutingTile> it = ctx.tiles.iterator();
int loaded = 0;
while(it.hasNext()) {
it.advance();
RoutingTile t = it.value();
if(t.isLoaded()) {
list.add(t);
loaded++;
}
void addNumber(float v) {
set.add(v);
}
ctx.maxLoadedTiles = Math.max(ctx.maxLoadedTiles, ctx.getCurrentlyLoadedTiles());
Collections.sort(list, new Comparator<RoutingTile>() {
private int pow(int base, int pw) {
int r = 1;
for (int i = 0; i < pw; i++) {
r *= base;
}
return r;
}
@Override
public String toString() {
int segmentation = 7;
StringBuilder sb = new StringBuilder();
sb.append(name).append(" (").append(set.size()).append(") : ");
float s = set.size() / ((float) segmentation);
int k = 0, number = 0;
float limit = 0, value = 0;
Iterator<Float> it = set.iterator();
while (it.hasNext()) {
k++;
number++;
value += it.next();
if (k >= limit) {
limit += s;
sb.append(value / number).append(" ");
number = 0;
value = 0;
public int compare(RoutingTile o1, RoutingTile o2) {
int v1 = (o1.access + 1) * pow(10, o1.getUnloadCont() -1);
int v2 = (o2.access + 1) * pow(10, o2.getUnloadCont() -1);
return v1 < v2 ? -1 : (v1 == v2 ? 0 : 1);
}
});
int toUnload = Math.max(loaded / 5, loaded - desirableSize);
for (int i = 0; i < loaded; i++) {
list.get(i).access = 0;
if (i < toUnload) {
ctx.unloadTile(list.get(i), true);
}
}
if(number > 0) {
sb.append(value / number).append(" ");
}
return sb.toString();
}
}
private void relaxNotNeededSegments(RoutingContext ctx, PriorityQueue<RouteSegment> graphSegments, boolean inverse) {
RouteSegment next = graphSegments.peek();
double mine = next.distanceToEnd;
// int before = graphSegments.size();
@ -338,17 +342,27 @@ public class BinaryRoutePlanner {
return result;
}
private void registerRouteDataObject(final RoutingContext ctx, RouteDataObject o) {
RouteDataObject old = ctx.idObjects.get(o.id);
// sometimes way are presented only partially in one index
if ((old != null && old.pointsX.size() >= o.pointsX.size()) || (!ctx.getRouter().acceptLine(o))) {
private void registerRouteDataObject(final RoutingContext ctx, RouteDataObject o, RoutingTile suggestedTile ) {
if(!ctx.getRouter().acceptLine(o)){
return;
}
ctx.idObjects.put(o.id, o);
RoutingTile tl = suggestedTile;
RouteDataObject old = tl.idObjects.get(o.id);
// sometimes way is present only partially in one index
if (old != null && old.pointsX.size() >= o.pointsX.size()) {
return;
};
for (int j = 0; j < o.pointsX.size(); j++) {
long l = (((long) o.pointsX.getQuick(j)) << 31) + (long) o.pointsY.getQuick(j);
int x = o.pointsX.getQuick(j);
int y = o.pointsY.getQuick(j);
if(!tl.checkContains(x, y)){
// don't register in different tiles
// in order to throw out tile object easily
continue;
}
long l = (((long) x) << 31) + (long) y;
RouteSegment segment = new RouteSegment(o , j);
RouteSegment prev = ctx.routes.get(l);
RouteSegment prev = tl.routes.get(l);
boolean i = true;
if (prev != null) {
if (old == null) {
@ -371,7 +385,7 @@ public class BinaryRoutePlanner {
}
}
if (i) {
ctx.routes.put(l, segment);
tl.routes.put(l, segment);
}
}
}
@ -381,28 +395,31 @@ public class BinaryRoutePlanner {
System.out.println(logMsg);
}
public void printDebugMemoryInformation(RoutingContext ctx,
PriorityQueue<RouteSegment> graphDirectSegments, PriorityQueue<RouteSegment> graphReverseSegments,
TLongObjectHashMap<RouteSegment> visitedDirectSegments, TLongObjectHashMap<RouteSegment> visitedOppositeSegments){
println("Time to calculate : " + (System.nanoTime() - ctx.timeToCalculate) / 1e6 +", time to load : " + ctx.timeToLoad / 1e6 );
println("Loaded tiles : " + ctx.loadedTiles.size() + ", visited roads " + ctx.visitedSegments);
println("Relaxed roads: " + ctx.relaxedSegments);
if(graphDirectSegments != null && graphReverseSegments != null) {
println("Priority queues sizes : " + graphDirectSegments.size() +"/" + graphReverseSegments.size());
public void printDebugMemoryInformation(RoutingContext ctx, PriorityQueue<RouteSegment> graphDirectSegments, PriorityQueue<RouteSegment> graphReverseSegments,
TLongObjectHashMap<RouteSegment> visitedDirectSegments,TLongObjectHashMap<RouteSegment> visitedOppositeSegments) {
println("Time to calculate : " + (System.nanoTime() - ctx.timeToCalculate) / 1e6 + ", time to load : " + ctx.timeToLoad / 1e6);
println("Current loaded tiles : " + ctx.getCurrentlyLoadedTiles() + ", maximum loaded tiles " + ctx.maxLoadedTiles);
println("Loaded tiles : " + ctx.loadedTiles + ", unloaded tiles " + ctx.unloadedTiles +
" (distinct " + ctx.distinctUnloadedTiles.size()+") "+ ", loaded \"unloaded\" tiles "
+ ctx.loadedPrevUnloadedTiles );
println("Visited roads, " + ctx.visitedSegments + ", relaxed roads " + ctx.relaxedSegments);
if (graphDirectSegments != null && graphReverseSegments != null) {
println("Priority queues sizes : " + graphDirectSegments.size() + "/" + graphReverseSegments.size());
}
if(visitedDirectSegments != null && visitedOppositeSegments != null) {
println("Visited segments sizes: " + visitedDirectSegments.size() +"/" + visitedOppositeSegments.size());
if (visitedDirectSegments != null && visitedOppositeSegments != null) {
println("Visited segments sizes: " + visitedDirectSegments.size() + "/" + visitedOppositeSegments.size());
}
}
public void loadRoutes(final RoutingContext ctx, int tile31X, int tile31Y, final List<RouteDataObject> toFillIn) {
public RoutingTile loadRoutes(final RoutingContext ctx, int tile31X, int tile31Y, final List<RouteDataObject> toFillIn) {
int zoomToLoad = 31 - ctx.getZoomToLoadTileWithRoads();
int tileX = tile31X >> zoomToLoad;
int tileY = tile31Y >> zoomToLoad;
int tileC = (tileX << ctx.getZoomToLoadTileWithRoads()) + tileY;
if (ctx.loadedTiles.contains(tileC) && toFillIn == null) {
return;
final RoutingTile tile = ctx.getRoutingTile(tile31X, tile31Y);
if (tile.isLoaded() && toFillIn == null) {
tile.access++;
return tile;
}
long now = System.nanoTime();
ResultMatcher<RouteDataObject> matcher = new ResultMatcher<RouteDataObject>() {
@ -413,7 +430,7 @@ public class BinaryRoutePlanner {
toFillIn.add(o);
}
}
registerRouteDataObject(ctx, o);
registerRouteDataObject(ctx, o, tile);
return false;
}
@ -424,15 +441,20 @@ public class BinaryRoutePlanner {
};
SearchRequest<RouteDataObject> request = BinaryMapIndexReader.buildSearchRouteRequest(tileX << zoomToLoad,
(tileX + 1) << zoomToLoad, tileY << zoomToLoad, (tileY + 1) << zoomToLoad, matcher);
for (Entry<BinaryMapIndexReader,List<RouteSubregion>> r : map.entrySet()) {
for (Entry<BinaryMapIndexReader, List<RouteSubregion>> r : map.entrySet()) {
try {
r.getKey().searchRouteIndex(request, r.getValue());
} catch (IOException e) {
throw new RuntimeException("Loading data exception", e);
}
}
ctx.loadedTiles.add(tileC);
ctx.loadedTiles++;
if(tile.isUnloaded()) {
ctx.loadedPrevUnloadedTiles++;
}
tile.setLoaded();
ctx.timeToLoad += (System.nanoTime() - now);
return tile;
}
@ -502,9 +524,8 @@ public class BinaryRoutePlanner {
// 2. calculate point and try to load neighbor ways if they are not loaded
int x = road.getPoint31XTile(segmentEnd);
int y = road.getPoint31YTile(segmentEnd);
loadRoutes(ctx, x, y, null);
RoutingTile tile = loadRoutes(ctx, x, y, null);
// TO-DO ADD-INFO attach add information about speed cameras here
// 2.1 calculate possible obstacle plus time
if(d > 0){
obstaclePlusTime += ctx.getRouter().defineObstacle(road, segmentEnd);
@ -514,11 +535,11 @@ public class BinaryRoutePlanner {
long l = (((long) x) << 31) + (long) y;
RouteSegment next = ctx.routes.get(l);
RouteSegment next = tile.routes.get(l);
// 3. get intersected ways
if (next != null) {
// TO-DO U-Turn
if(next == segment && next.next == null) {
if((next == segment || next.road.id == road.id) && next.next == null) {
// simplification if there is no real intersection
continue;
}
@ -708,43 +729,6 @@ public class BinaryRoutePlanner {
return false;
}
public static class RouteSegment {
final int segmentStart;
final RouteDataObject road;
// needed to store intersection of routes
RouteSegment next = null;
// search context (needed for searching route)
// Initially it should be null (!) because it checks was it segment visited before
RouteSegment parentRoute = null;
int parentSegmentEnd = 0;
// distance measured in time (seconds)
double distanceFromStart = 0;
double distanceToEnd = 0;
public RouteSegment(RouteDataObject road, int segmentStart) {
this.road = road;
this.segmentStart = segmentStart;
}
public RouteSegment getNext() {
return next;
}
public int getSegmentStart() {
return segmentStart;
}
public RouteDataObject getRoad() {
return road;
}
public String getTestName(){
return String.format("s%.2f e%.2f", ((float)distanceFromStart), ((float)distanceToEnd));
}
}
/**
* Helper method to prepare final result
*/
@ -818,15 +802,6 @@ public class BinaryRoutePlanner {
}
public interface RouteSegmentVisitor {
public void visitSegment(RouteSegment segment, boolean poll);
}
/*public */static int roadPriorityComparator(double o1DistanceFromStart, double o1DistanceToEnd,
double o2DistanceFromStart, double o2DistanceToEnd, double heuristicCoefficient ) {
// f(x) = g(x) + h(x) --- g(x) - distanceFromStart, h(x) - distanceToEnd (not exact)
@ -835,5 +810,87 @@ public class BinaryRoutePlanner {
}
public interface RouteSegmentVisitor {
public void visitSegment(RouteSegment segment, boolean poll);
}
public static class RouteSegment {
final int segmentStart;
final RouteDataObject road;
// needed to store intersection of routes
RouteSegment next = null;
// search context (needed for searching route)
// Initially it should be null (!) because it checks was it segment visited before
RouteSegment parentRoute = null;
int parentSegmentEnd = 0;
// distance measured in time (seconds)
double distanceFromStart = 0;
double distanceToEnd = 0;
public RouteSegment(RouteDataObject road, int segmentStart) {
this.road = road;
this.segmentStart = segmentStart;
}
public RouteSegment getNext() {
return next;
}
public int getSegmentStart() {
return segmentStart;
}
public RouteDataObject getRoad() {
return road;
}
public String getTestName(){
return String.format("s%.2f e%.2f", ((float)distanceFromStart), ((float)distanceToEnd));
}
}
public static class SegmentStat {
String name;
Set<Float> set = new TreeSet<Float>();
public SegmentStat(String name) {
this.name = name;
}
void addNumber(float v) {
set.add(v);
}
@Override
public String toString() {
int segmentation = 7;
StringBuilder sb = new StringBuilder();
sb.append(name).append(" (").append(set.size()).append(") : ");
float s = set.size() / ((float) segmentation);
int k = 0, number = 0;
float limit = 0, value = 0;
Iterator<Float> it = set.iterator();
while (it.hasNext()) {
k++;
number++;
value += it.next();
if (k >= limit) {
limit += s;
sb.append(value / number).append(" ");
number = 0;
value = 0;
}
}
if(number > 0) {
sb.append(value / number).append(" ");
}
return sb.toString();
}
}
}

121
DataExtractionOSM/src/net/osmand/router/RoutingContext.java
View file

@ -1,8 +1,10 @@
package net.osmand.router;
import java.util.ArrayList;
import java.util.Iterator;
import gnu.trove.map.TLongObjectMap;
import gnu.trove.map.hash.TIntObjectHashMap;
import gnu.trove.map.hash.TLongObjectHashMap;
import gnu.trove.set.TIntSet;
import gnu.trove.set.TLongSet;
@ -18,10 +20,12 @@ import net.osmand.router.BinaryRoutePlanner.RouteSegmentVisitor;
public class RoutingContext {
private static int DEFAULT_HEURISTIC_COEFFICIENT = 1;
private static int ZOOM_TO_LOAD_TILES = 13; // 12?, 14?
public static int ITERATIONS_TO_RUN_GC = 100;
// 1. parameters of routing and different tweaks
private int heuristicCoefficient = DEFAULT_HEURISTIC_COEFFICIENT;
private double heuristicCoefficient = DEFAULT_HEURISTIC_COEFFICIENT;
private int zoomToLoadTileWithRoads = ZOOM_TO_LOAD_TILES;
private boolean useRelaxingStrategy = true;
// null - 2 ways, true - direct way, false - reverse way
private Boolean planRoadDirection = null;
private VehicleRouter router = new CarRouter();
@ -29,13 +33,10 @@ public class RoutingContext {
// not used right now
private boolean usingShortestWay = false;
// 2. Routing memory cache (big objects)
TLongObjectMap<RouteSegment> routes = new TLongObjectHashMap<RouteSegment>();
TIntSet loadedTiles = new TIntHashSet();
// TODO delete this object ?
TLongObjectHashMap<RouteDataObject> idObjects = new TLongObjectHashMap<RouteDataObject>();
int relaxedIteration = 0;
TIntObjectHashMap<RoutingTile> tiles = new TIntObjectHashMap<RoutingContext.RoutingTile>();
int garbageCollectorIteration = 0;
// 4. Warm object caches
TLongSet nonRestrictedIds = new TLongHashSet();
@ -57,22 +58,32 @@ public class RoutingContext {
// 3. debug information (package accessor)
long timeToLoad = 0;
long timeToCalculate = 0;
int loadedTiles = 0;
int maxLoadedTiles = 0;
int loadedPrevUnloadedTiles = 0;
int unloadedTiles = 0;
TIntHashSet distinctUnloadedTiles = new TIntHashSet();
int visitedSegments = 0;
int relaxedSegments = 0;
// callback of processing segments
RouteSegmentVisitor visitor = null;
public RouteSegmentVisitor getVisitor() {
return visitor;
}
public TLongObjectMap<RouteSegment> getLoadedRoutes() {
return routes;
public int getCurrentlyLoadedTiles() {
int cnt = 0;
Iterator<RoutingTile> it = tiles.valueCollection().iterator();
while (it.hasNext()) {
if (it.next().isLoaded()) {
cnt++;
}
}
return cnt;
}
public void setVisitor(RouteSegmentVisitor visitor) {
this.visitor = visitor;
@ -86,6 +97,14 @@ public class RoutingContext {
return zoomToLoadTileWithRoads;
}
public boolean isUseRelaxingStrategy() {
return useRelaxingStrategy;
}
public void setUseRelaxingStrategy(boolean useRelaxingStrategy) {
this.useRelaxingStrategy = useRelaxingStrategy;
}
public void setUseDynamicRoadPrioritising(boolean useDynamicRoadPrioritising) {
this.useDynamicRoadPrioritising = useDynamicRoadPrioritising;
}
@ -98,11 +117,12 @@ public class RoutingContext {
return usingShortestWay;
}
public void setRouter(VehicleRouter router) {
this.router = router;
}
public void setHeuristicCoefficient(int heuristicCoefficient) {
public void setHeuristicCoefficient(double heuristicCoefficient) {
this.heuristicCoefficient = heuristicCoefficient;
}
@ -126,4 +146,79 @@ public class RoutingContext {
return BinaryRoutePlanner.roadPriorityComparator(o1DistanceFromStart, o1DistanceToEnd, o2DistanceFromStart, o2DistanceToEnd,
heuristicCoefficient);
}
public RoutingTile getRoutingTile(int x31, int y31){
int xloc = x31 >> (31 - zoomToLoadTileWithRoads);
int yloc = y31 >> (31 - zoomToLoadTileWithRoads);
int l = (xloc << zoomToLoadTileWithRoads) + yloc;
RoutingTile tl = tiles.get(l);
if(tl == null) {
tl = new RoutingTile(xloc, yloc, zoomToLoadTileWithRoads);
tiles.put(l, tl);
}
return tiles.get(l);
}
public void unloadTile(RoutingTile tile, boolean createEmpty){
int l = (tile.tileX << zoomToLoadTileWithRoads) + tile.tileY;
RoutingTile old = tiles.remove(l);
RoutingTile n = new RoutingTile(tile.tileX, tile.tileY, zoomToLoadTileWithRoads);
n.isLoaded = old.isLoaded;
n.setUnloaded();
tiles.put(l, n);
unloadedTiles++;
distinctUnloadedTiles.add(l);
}
public static class RoutingTile {
private int tileX;
private int tileY;
private int zoom;
private int isLoaded;
// make it without get/set for fast access
public int access;
public RoutingTile(int tileX, int tileY, int zoom) {
this.tileX = tileX;
this.tileY = tileY;
this.zoom = zoom;
}
public boolean isLoaded() {
return isLoaded > 0;
}
public int getUnloadCont(){
return Math.abs(isLoaded);
}
public boolean isUnloaded() {
return isLoaded < 0;
}
public void setUnloaded() {
if(isLoaded == 0) {
this.isLoaded = -1;
} else {
isLoaded = -Math.abs(isLoaded);
}
}
public void setLoaded() {
isLoaded = Math.abs(isLoaded) + 1;
}
TLongObjectMap<RouteSegment> routes = new TLongObjectHashMap<RouteSegment>();
TIntSet loadedTiles = new TIntHashSet();
// TODO delete this object ?
TLongObjectHashMap<RouteDataObject> idObjects = new TLongObjectHashMap<RouteDataObject>();
public boolean checkContains(int x31, int y31) {
return tileX == (x31 >> (31 - zoom)) && tileY == (y31 >> (31 - zoom));
}
public TLongObjectMap<RouteSegment> getLoadedRoutes() {
return routes;
}
}
}

7
DataExtractionOSM/src/net/osmand/swing/MapClusterLayer.java
View file

@ -214,7 +214,8 @@ public class MapClusterLayer implements MapPanelLayer {
RouteDataObject startRoad = st.getRoad();
long lstart = (((long) startRoad.getPoint31XTile(st.getSegmentStart())) << 31) +
(long) startRoad.getPoint31YTile(st.getSegmentStart());
RouteSegment next = ctx.getLoadedRoutes().get(lstart);
RouteSegment next = ctx.getRoutingTile((int)lstart>>31, (int) (lstart- (lstart>>31)<<31)).
getLoadedRoutes().get(lstart);
while (next != null) {
if(next.getRoad().getId() != st.getRoad().getId()){
queue.add(next);
@ -283,7 +284,7 @@ public class MapClusterLayer implements MapPanelLayer {
router.loadRoutes(ctx, x ,y , null);
long l = (((long) x) << 31) + (long) y;
next = ctx.getLoadedRoutes().get(l);
next = ctx.getRoutingTile(x, y).getLoadedRoutes().get(l);
boolean addToQueue = true;;
while (next != null) {
String h = getHighway(next.getRoad());
@ -300,7 +301,7 @@ public class MapClusterLayer implements MapPanelLayer {
}
if (addToQueue) {
next = ctx.getLoadedRoutes().get(l);
next = ctx.getRoutingTile(x, y).getLoadedRoutes().get(l);
while (next != null) {
if (!visitedIds.contains(calculateId(next, next.getSegmentStart()))) {
queue.add(next);