@Override
public void run(final Network network) {
super.run(network);
log.info("Putting landmarks on network...");
long now = System.currentTimeMillis();
landmarks = landmarker.identifyLandmarks(landmarkCount, network);
log.info("done in " + (System.currentTimeMillis() - now) + " ms");
log.info("Initializing landmarks data");
for (Node node : network.getNodes().values()) {
this.nodeData.put(node, new LandmarksData(this.landmarkCount));
}
int nOfThreads = this.numberOfThreads;
if (nOfThreads > this.landmarks.length) {
nOfThreads = this.landmarks.length;
}
if (nOfThreads < 2) {
nOfThreads = 2; // always use at least two threads
}
log.info(
"Calculating distance from each node to each of the "
+ this.landmarkCount
+ " landmarks using "
+ nOfThreads
+ " threads...");
now = System.currentTimeMillis();
ExecutorService executor = Executors.newFixedThreadPool(nOfThreads);
for (int i = 0; i < this.landmarks.length; i++) {
executor.execute(new Calculator(i, this.landmarks[i], this.nodeData, this.costFunction));
}
executor.shutdown();
while (!executor.isTerminated()) {
log.info("wait for landmarks Calculator to finish...");
try {
executor.awaitTermination(10, TimeUnit.MINUTES);
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
for (Node node : network.getNodes().values()) {
LandmarksData r = getNodeData(node);
r.updateMinMaxTravelTimes();
}
for (Node node : network.getNodes().values()) {
LandmarksData r = getNodeData(node);
for (int i = 0; i < this.landmarks.length; i++) {
if (r.getMinLandmarkTravelTime(i) > r.getMaxLandmarkTravelTime(i)) {
log.info("Min > max for node " + node.getId() + " and landmark " + i);
}
}
}
log.info("done in " + (System.currentTimeMillis() - now) + " ms");
}
private void expandLandmarkTo() {
LandmarksToTravelTimeComparator comparator =
new LandmarksToTravelTimeComparator(this.nodeData, this.landmarkIdx);
PriorityQueue<Node> pendingNodes = new PriorityQueue<>(100, comparator);
LandmarksData role = (LandmarksData) this.nodeData.get(this.landmark);
role.setToLandmarkTravelTime(this.landmarkIdx, 0.0);
role.setFromLandmarkTravelTime(this.landmarkIdx, 0.0);
pendingNodes.add(this.landmark);
while (!pendingNodes.isEmpty()) {
Node node = pendingNodes.poll();
double toTravTime =
((LandmarksData) this.nodeData.get(node)).getToLandmarkTravelTime(this.landmarkIdx);
LandmarksData role2;
for (Link l : node.getInLinks().values()) {
Node n = l.getFromNode();
double linkTravTime = this.costFunction.getLinkMinimumTravelDisutility(l);
role2 = (LandmarksData) this.nodeData.get(n);
double totalTravelTime = toTravTime + linkTravTime;
if (role2.getToLandmarkTravelTime(this.landmarkIdx) > totalTravelTime) {
role2.setToLandmarkTravelTime(this.landmarkIdx, totalTravelTime);
pendingNodes.add(n);
}
}
}
}
