Examples with ChangeGraphHelper com.graphhopper.storage.change.ChangeGraphHelper used on opensource projects

Example 1 with ChangeGraphHelper

use of com.graphhopper.storage.change.ChangeGraphHelper in project graphhopper by graphhopper.

the class GraphHopperAPITest method testConcurrentGraphChange.

@Test
public void testConcurrentGraphChange() throws InterruptedException {
    final GraphHopperStorage graph = new GraphBuilder(encodingManager).create();
    initGraph(graph);
    graph.edge(1, 2, 10, true);
    final CountDownLatch latch = new CountDownLatch(1);
    final AtomicInteger checkPointCounter = new AtomicInteger(0);
    final GraphHopper graphHopper = new GraphHopper() {

        @Override
        protected ChangeGraphHelper createChangeGraphHelper(Graph graph, LocationIndex locationIndex) {
            return new ChangeGraphHelper(graph, locationIndex) {

                @Override
                public long applyChanges(EncodingManager em, Collection<JsonFeature> features) {
                    // force sleep inside the lock and let the main thread run until the lock barrier
                    latch.countDown();
                    try {
                        Thread.sleep(400);
                    } catch (InterruptedException e) {
                        throw new RuntimeException(e);
                    }
                    checkPointCounter.incrementAndGet();
                    return super.applyChanges(em, features);
                }
            };
        }
    }.setStoreOnFlush(false).setEncodingManager(encodingManager).setCHEnabled(false).loadGraph(graph);
    GHResponse rsp = graphHopper.route(new GHRequest(42, 10.4, 42, 10));
    assertFalse(rsp.toString(), rsp.hasErrors());
    assertEquals(1800, rsp.getBest().getTime());
    final List<JsonFeature> list = new ArrayList<>();
    Map<String, Object> properties = new HashMap<>();
    properties.put("speed", 5);
    list.add(new JsonFeature("1", "bbox", new BBox(10.399, 10.4, 42.0, 42.001), null, properties));
    ExecutorService executorService = Executors.newFixedThreadPool(1);
    executorService.submit(new Runnable() {

        @Override
        public void run() {
            graphHopper.changeGraph(list);
            checkPointCounter.incrementAndGet();
        }
    });
    latch.await();
    assertEquals(0, checkPointCounter.get());
    rsp = graphHopper.route(new GHRequest(42, 10.4, 42, 10));
    assertFalse(rsp.toString(), rsp.hasErrors());
    assertEquals(8400, rsp.getBest().getTime());
    executorService.shutdown();
    executorService.awaitTermination(3, TimeUnit.SECONDS);
    assertEquals(2, checkPointCounter.get());
}

Example 2 with ChangeGraphHelper

use of com.graphhopper.storage.change.ChangeGraphHelper in project graphhopper by graphhopper.

the class GraphHopper method changeGraph.

/**
 * This method applies the changes to the graph specified as feature collection. It does so by locking the routing
 * to avoid concurrent changes which could result in incorrect routing (like when done while a Dijkstra search) or
 * also while just reading one edge row (inconsistent edge properties).
 */
public ChangeGraphResponse changeGraph(Collection<JsonFeature> collection) {
    // TODO allow calling this method if called before CH preparation
    if (getCHFactoryDecorator().isEnabled())
        throw new IllegalArgumentException("To use the changeGraph API you need to turn off CH");
    Lock writeLock = readWriteLock.writeLock();
    writeLock.lock();
    try {
        ChangeGraphHelper overlay = createChangeGraphHelper(ghStorage, locationIndex);
        long updateCount = overlay.applyChanges(encodingManager, collection);
        return new ChangeGraphResponse(updateCount);
    } finally {
        writeLock.unlock();
    }
}