Exemplo n.º 1
0
 /**
  * initial for routing, if the start node is an intersect, then it should already in the adjlist,
  * than we just add it. If the start node is not intersect, then the node will not in adjlist, we
  * need find the node's two edge entrance if the edge is bidirection or one edge entrance if the
  * edge is oneway.
  *
  * @param startNode
  * @param endNode
  * @param startTime
  * @param dayIndex
  * @param nodeHelperCache
  */
 public static PriorityQueue<NodeInfoHelper> initialStartSet(
     long startNode,
     long endNode,
     int startTime,
     int dayIndex,
     HashMap<Long, NodeInfoHelper> nodeHelperCache) {
   PriorityQueue<NodeInfoHelper> openSet =
       new PriorityQueue<NodeInfoHelper>(
           10000,
           new Comparator<NodeInfoHelper>() {
             public int compare(NodeInfoHelper n1, NodeInfoHelper n2) {
               return (int) (n1.getTotalCost() - n2.getTotalCost());
             }
           });
   NodeInfo start = OSMData.nodeHashMap.get(startNode);
   NodeInfoHelper current;
   // initial start end set
   if (start.isIntersect()) {
     // initial
     current = new NodeInfoHelper(startNode);
     current.setCost(0);
     current.setCurrentLevel(10);
     current.setHeuristic(OSMRouting.estimateHeuristic(startNode, endNode));
     openSet.offer(current); // push the start node
     nodeHelperCache.put(current.getNodeId(), current); // add cache
   } else {
     EdgeInfo edge = start.getOnEdgeList().getFirst();
     double travelTime = 1; // second
     int distance; // feet
     int totalDistance = edge.getDistance(); // feet
     if (!edge.isOneway()) {
       // distance from start to middle
       distance = edge.getStartDistance(startNode);
       travelTime = edge.getTravelTime(startTime, dayIndex, false);
       travelTime *= (double) distance / totalDistance;
       travelTime /= OSMParam.MILLI_PER_SECOND;
       current = new NodeInfoHelper(edge.getStartNode());
       current.setCost(travelTime);
       current.setCurrentLevel(10);
       current.setHeuristic(OSMRouting.estimateHeuristic(edge.getStartNode(), endNode));
       openSet.offer(current); // push the start node
       nodeHelperCache.put(current.getNodeId(), current); // add cache
     }
     // distance from middle to end
     distance = edge.getEndDistance(startNode);
     travelTime = edge.getTravelTime(startTime, dayIndex, true);
     travelTime *= (double) distance / totalDistance;
     current = new NodeInfoHelper(edge.getEndNode());
     current.setCost(travelTime);
     current.setCurrentLevel(10);
     current.setHeuristic(OSMRouting.estimateHeuristic(edge.getEndNode(), endNode));
     openSet.offer(current); // push the start node
     nodeHelperCache.put(current.getNodeId(), current); // add cache
   }
   return openSet;
 }
Exemplo n.º 2
0
 /**
  * using low bound for travel time, for reverse searching
  *
  * @param endNode
  * @param startNode
  * @param openSet
  * @param nodeHelperCache
  */
 public void initialEndSet(
     long startNode,
     long endNode,
     PriorityQueue<NodeInfoHelper> openSet,
     HashMap<Long, NodeInfoHelper> nodeHelperCache) {
   NodeInfo start = OSMData.nodeHashMap.get(startNode);
   NodeInfoHelper current;
   // initial start end set
   if (start.isIntersect()) {
     // initial
     current = new NodeInfoHelper(startNode);
     current.setCost(0);
     current.setCurrentLevel(10);
     current.setHeuristic(OSMRouting.estimateHeuristic(startNode, endNode));
     openSet.offer(current); // push the start node
     nodeHelperCache.put(current.getNodeId(), current); // add cache
   } else {
     EdgeInfo edge = start.getOnEdgeList().getFirst();
     double travelTime = 1; // second
     int distance; // feet
     int totalDistance = edge.getDistance(); // feet
     if (!edge.isOneway()) {
       // distance from start to middle
       distance = edge.getStartDistance(startNode);
       // get low bound of travel time
       travelTime = edge.getTravelTimeMin(false);
       travelTime *= (double) distance / totalDistance;
       current = new NodeInfoHelper(edge.getStartNode());
       current.setCost(travelTime);
       current.setCurrentLevel(10);
       current.setHeuristic(OSMRouting.estimateHeuristic(edge.getStartNode(), endNode));
       openSet.offer(current); // push the start node
       nodeHelperCache.put(current.getNodeId(), current); // add cache
     }
     // distance from middle to end
     distance = edge.getEndDistance(startNode);
     travelTime = edge.getTravelTimeMin(true);
     travelTime *= (double) distance / totalDistance;
     current = new NodeInfoHelper(edge.getEndNode());
     current.setCost(travelTime);
     current.setCurrentLevel(10);
     current.setHeuristic(OSMRouting.estimateHeuristic(edge.getEndNode(), endNode));
     openSet.offer(current); // push the start node
     nodeHelperCache.put(current.getNodeId(), current); // add cache
   }
 }
Exemplo n.º 3
0
  public static FibonacciHeap<NodeInfoHelper> initialStartSet(
      long startNode,
      long endNode,
      HashMap<Long, FibonacciHeapNode<NodeInfoHelper>> nodeHelperCache) {
    FibonacciHeap<NodeInfoHelper> openSet = new FibonacciHeap<NodeInfoHelper>();

    NodeInfo start = OSMData.nodeHashMap.get(startNode);
    NodeInfoHelper initial;
    FibonacciHeapNode<NodeInfoHelper> fInitial;
    // initial start end set
    if (start.isIntersect()) {
      // initial
      initial = new NodeInfoHelper(startNode);
      initial.setCost(0);
      initial.setHeuristic(estimateHeuristic(startNode, endNode));
      fInitial = new FibonacciHeapNode<NodeInfoHelper>(initial);
      openSet.insert(fInitial, initial.getTotalCost()); // push the start node
      nodeHelperCache.put(initial.getNodeId(), fInitial); // add cache
    } else {
      EdgeInfo edge = start.getOnEdgeList().getFirst();
      double speed = edge.getTravelSpeed();
      int travelTime = 1; // second
      int distance;
      if (!edge.isOneway()) {
        // distance from start to middle
        distance = edge.getStartDistance(startNode);
        travelTime = (int) Math.round(distance / speed * OSMParam.MILLI_PER_SECOND);
        initial = new NodeInfoHelper(edge.getStartNode());
        initial.setCost(travelTime);
        initial.setHeuristic(estimateHeuristic(edge.getStartNode(), endNode));
        fInitial = new FibonacciHeapNode<NodeInfoHelper>(initial);
        openSet.insert(fInitial, initial.getTotalCost()); // push the start node
        nodeHelperCache.put(initial.getNodeId(), fInitial); // add cache
      }
      distance = edge.getEndDistance(startNode);
      travelTime = (int) Math.round(distance / speed * OSMParam.MILLI_PER_SECOND);
      initial = new NodeInfoHelper(edge.getEndNode());
      initial.setCost(travelTime);
      initial.setHeuristic(estimateHeuristic(edge.getEndNode(), endNode));
      fInitial = new FibonacciHeapNode<NodeInfoHelper>(initial);
      openSet.insert(fInitial, initial.getTotalCost()); // push the start node
      nodeHelperCache.put(initial.getNodeId(), fInitial); // add cache
    }
    return openSet;
  }
Exemplo n.º 4
0
 public NodeInfoHelper getEndNodeHelper(long endNode) {
   // TODO: not time dependent now, need to modify
   NodeInfo end = OSMData.nodeHashMap.get(endNode);
   NodeInfoHelper endNodeHelper = new NodeInfoHelper(endNode);
   if (getNodeId() == end.getNodeId()) { // no need to do in edge routing
     return this;
   } else {
     EdgeInfo edge = end.getOnEdgeList().getFirst();
     int distance;
     // from start to middle
     if (getNodeId() == edge.getStartNode()) {
       distance = edge.getStartDistance(endNode);
     } else { // from end to middle
       distance = edge.getEndDistance(endNode);
     }
     double speed = edge.getTravelSpeed();
     int travelTime = 1; // second
     travelTime = (int) Math.round(distance / speed);
     endNodeHelper.setCost(getCost() + travelTime);
     endNodeHelper.setParentId(getNodeId());
   }
   return endNodeHelper;
 }
Exemplo n.º 5
0
  // TODO : if start or end is already in the highway, will occur the problem, need to fix
  public static double routingHierarchy(
      long startNode, long endNode, int startTime, int dayIndex, ArrayList<Long> pathNodeList) {
    // System.out.println("start finding the path...");
    int debug = 0;
    try {
      if (!OSMData.nodeHashMap.containsKey(startNode)
          || !OSMData.nodeHashMap.containsKey(endNode)) {
        System.err.println("cannot find start or end node!");
        return -1;
      }

      if (startNode == endNode) {
        System.out.println("start node is the same as end node.");
        return 0;
      }

      NodeInfo start = OSMData.nodeHashMap.get(startNode);
      NodeInfo end = OSMData.nodeHashMap.get(endNode);
      double minDistance = Geometry.calculateDistance(start.getLocation(), end.getLocation());
      if (minDistance < 5) { // use normal A* algorithm to calculate small distance
        return routingAStar(
            start.getNodeId(),
            end.getNodeId(),
            OSMRouteParam.START_TIME,
            OSMRouteParam.DAY_INDEX,
            pathNodeList);
      }

      SearchingSharing sharingData = new SearchingSharing();
      HashMap<Long, NodeInfoHelper> nodeForwardCache = new HashMap<Long, NodeInfoHelper>();
      HashMap<Long, NodeInfoHelper> nodeReverseCache = new HashMap<Long, NodeInfoHelper>();
      ForwardSearching forwardSearching =
          new ForwardSearching(
              startNode, endNode, startTime, dayIndex, sharingData, nodeForwardCache);
      ReverseSearching reverseSearching =
          new ReverseSearching(endNode, startNode, sharingData, nodeReverseCache);
      // two thread run simultaneously
      Thread forwardThread = new Thread(forwardSearching);
      Thread reverseThread = new Thread(reverseSearching);
      // search forward
      forwardThread.start();
      // let forward searching for a while
      // Thread.sleep(100);
      // search reverse
      reverseThread.start();
      // waiting for thread finish
      forwardThread.join();
      reverseThread.join();
      // get the searching intersects
      ArrayList<Long> intersectList = sharingData.getIntersectList();
      // pick the least cost one according to time-dependent
      double minCost = Double.MAX_VALUE;
      ArrayList<Long> minCostPath = new ArrayList<Long>();
      for (long intersect : intersectList) {
        NodeInfoHelper current = nodeForwardCache.get(intersect);
        // cost from source to intersect
        double cost = current.getCost();
        current = nodeReverseCache.get(intersect);
        // update the reverse cost as forward cost
        current.setCost(cost);
        ArrayList<Long> reversePath = new ArrayList<Long>();
        double totalCost = Double.MAX_VALUE;
        // recalculate from intersect to destination
        while (true) {
          long nodeId = current.getNodeId();
          int timeIndex =
              startTime
                  + (int)
                      (current.getCost()
                          / OSMParam.SECOND_PER_MINUTE
                          / OSMRouteParam.TIME_INTERVAL);
          if (timeIndex
              > OSMRouteParam.TIME_RANGE
                  - 1) // time [6am - 9 pm], we regard times after 9pm as constant edge weights
          timeIndex = OSMRouteParam.TIME_RANGE - 1;
          long nextNodeId = current.getParentId();
          double arriveTime = current.getCost();
          // arrive end
          if (nextNodeId == 0) {
            totalCost = arriveTime;
            break;
          }
          // add node
          reversePath.add(nextNodeId);
          // calculate cost according adjlist
          LinkedList<ToNodeInfo> adjNodeList = OSMData.adjListHashMap.get(nodeId);
          double costTime = 0;
          for (ToNodeInfo toNode : adjNodeList) {
            if (toNode.getNodeId() == nextNodeId) {
              int travelTime;
              // forward searching is time dependent
              if (toNode.isFix()) // fix time
              travelTime = toNode.getTravelTime();
              else // fetch from time array
              travelTime = toNode.getSpecificTravelTime(dayIndex, timeIndex);
              costTime = arriveTime + (double) travelTime / OSMParam.MILLI_PER_SECOND;
              break;
            }
          }
          current = nodeReverseCache.get(nextNodeId);
          if (costTime == 0) System.err.println("cost time cannot be zero!");
          else current.setCost(costTime);
        }

        // process the left nodes to real destination
        long lastNode = reversePath.get(reversePath.size() - 1);
        if (lastNode != endNode) {
          NodeInfo last = OSMData.nodeHashMap.get(lastNode);
          NodeInfo dest = OSMData.nodeHashMap.get(endNode);
          EdgeInfo onEdge = last.getEdgeFromNodes(dest);
          current = nodeReverseCache.get(lastNode);
          int totalDistance = onEdge.getDistance();
          int distance;
          long toNodeId;
          if (onEdge.getStartNode() == lastNode) { // from start to middle
            distance = onEdge.getStartDistance(endNode);
            toNodeId = onEdge.getEndNode();
          } else { // from end to middle
            distance = onEdge.getEndDistance(endNode);
            toNodeId = onEdge.getStartNode();
          }
          LinkedList<ToNodeInfo> adjNodeList = OSMData.adjListHashMap.get(lastNode);
          double costTime = 0;
          int timeIndex =
              startTime
                  + (int) (totalCost / OSMParam.SECOND_PER_MINUTE / OSMRouteParam.TIME_INTERVAL);
          if (timeIndex
              > OSMRouteParam.TIME_RANGE
                  - 1) // time [6am - 9 pm], we regard times after 9pm as constant edge weights
          timeIndex = OSMRouteParam.TIME_RANGE - 1;
          for (ToNodeInfo toNode : adjNodeList) {
            if (toNode.getNodeId() == toNodeId) {
              int travelTime;
              // forward searching is time dependent
              if (toNode.isFix()) // fix time
              travelTime = toNode.getTravelTime();
              else // fetch from time array
              travelTime = toNode.getSpecificTravelTime(dayIndex, timeIndex);
              costTime = (double) travelTime / OSMParam.MILLI_PER_SECOND;
              break;
            }
          }
          if (costTime != 0) {
            costTime *= (double) distance / totalDistance;
          }
          totalCost += costTime; // add cost
          reversePath.add(endNode); // add dest
        }

        // if found less cost path, build forward path
        if (totalCost < minCost) {
          ArrayList<Long> forwardPath = new ArrayList<Long>();
          minCost = totalCost;
          current = nodeForwardCache.get(intersect);
          long traceNodeId = current.getParentId();
          while (traceNodeId != 0) {
            forwardPath.add(traceNodeId); // add node
            current = nodeForwardCache.get(traceNodeId);
            traceNodeId = current.getParentId();
          }
          Collections.reverse(forwardPath); // reverse the path list
          // record min-cost path, combine forward path and reverse path
          minCostPath = new ArrayList<Long>();
          minCostPath.addAll(forwardPath);
          minCostPath.add(intersect);
          minCostPath.addAll(reversePath);
          // output kml
          // OSMOutput.generatePathKML(nodeHashMap, pathNodeList, "path_" + intersect);
          // ArrayList<Long> intersectNode = new ArrayList<Long>();
          // intersectNode.add(intersect);
          // OSMOutput.generatePathNodeKML(nodeHashMap, intersectNode, "intersect_" + intersect);
        }
      }
      pathNodeList.addAll(minCostPath);
      return minCost;
    } catch (Exception e) {
      e.printStackTrace();
      System.err.println("routingHierarchy: debug code " + debug);
    }
    return 0;
  }