Examples with GraphDatabaseService org.neo4j.graphdb.GraphDatabaseService used on opensource projects

Example 76 with GraphDatabaseService

use of org.neo4j.graphdb.GraphDatabaseService in project neo4j by neo4j.

the class RelationshipCountsTest method shouldReportTotalNumberOfRelationships.

@Test
public void shouldReportTotalNumberOfRelationships() throws Exception {
    // given
    GraphDatabaseService graphDb = db.getGraphDatabaseAPI();
    long before = numberOfRelationships();
    long during;
    try (Transaction tx = graphDb.beginTx()) {
        Node node = graphDb.createNode();
        node.createRelationshipTo(graphDb.createNode(), withName("KNOWS"));
        node.createRelationshipTo(graphDb.createNode(), withName("KNOWS"));
        node.createRelationshipTo(graphDb.createNode(), withName("KNOWS"));
        during = countsForRelationship(null, null, null);
        tx.success();
    }
    // when
    long after = numberOfRelationships();
    // then
    assertEquals(0, before);
    assertEquals(3, during);
    assertEquals(3, after);
}

Example 77 with GraphDatabaseService

use of org.neo4j.graphdb.GraphDatabaseService in project neo4j by neo4j.

the class RelationshipCountsTest method shouldAccountForDeletedRelationships.

@Test
public void shouldAccountForDeletedRelationships() throws Exception {
    // given
    GraphDatabaseService graphDb = db.getGraphDatabaseAPI();
    Relationship rel;
    try (Transaction tx = graphDb.beginTx()) {
        Node node = graphDb.createNode();
        node.createRelationshipTo(graphDb.createNode(), withName("KNOWS"));
        rel = node.createRelationshipTo(graphDb.createNode(), withName("KNOWS"));
        node.createRelationshipTo(graphDb.createNode(), withName("KNOWS"));
        tx.success();
    }
    long before = numberOfRelationships(), during;
    try (Transaction tx = graphDb.beginTx()) {
        rel.delete();
        during = countsForRelationship(null, null, null);
        tx.success();
    }
    // when
    long after = numberOfRelationships();
    // then
    assertEquals(3, before);
    assertEquals(2, during);
    assertEquals(2, after);
}

Example 78 with GraphDatabaseService

use of org.neo4j.graphdb.GraphDatabaseService in project neo4j by neo4j.

the class StoreLockerTest method mustPreventMultipleInstancesFromStartingOnSameStore.

@Test
public void mustPreventMultipleInstancesFromStartingOnSameStore() {
    File storeDir = target.graphDbDir();
    GraphDatabaseService db = new TestGraphDatabaseFactory().newEmbeddedDatabase(storeDir);
    try (Transaction tx = db.beginTx()) {
        db.createNode();
        tx.success();
    }
    try {
        new TestGraphDatabaseFactory().newEmbeddedDatabase(storeDir);
        fail("Should not be able to start up another db in the same dir");
    } catch (Exception e) {
    // Good
    } finally {
        db.shutdown();
    }
}

Example 79 with GraphDatabaseService

use of org.neo4j.graphdb.GraphDatabaseService in project neo4j by neo4j.

the class TraversalAStar method findPaths.

private Iterable<WeightedPath> findPaths(Node start, Node end, boolean multiplePaths) {
    PathInterest interest;
    if (multiplePaths) {
        interest = stopAfterLowestWeight ? PathInterestFactory.allShortest() : PathInterestFactory.all();
    } else {
        interest = PathInterestFactory.single();
    }
    GraphDatabaseService db = start.getGraphDatabase();
    TraversalDescription traversalDescription = db.traversalDescription().uniqueness(Uniqueness.NONE).expand(expander, initialState);
    lastTraverser = traversalDescription.order(new SelectorFactory(end, interest)).evaluator(includeWhereEndNodeIs(end)).traverse(start);
    return new Iterable<WeightedPath>() {

        @Override
        public Iterator<WeightedPath> iterator() {
            return new WeightedPathIterator(lastTraverser.iterator(), costEvaluator, stopAfterLowestWeight);
        }
    };
}

Example 80 with GraphDatabaseService

use of org.neo4j.graphdb.GraphDatabaseService in project neo4j by neo4j.

the class TraversalShortestPath method instantiateTraverser.

@Override
protected Traverser instantiateTraverser(Node start, Node end) {
    GraphDatabaseService db = start.getGraphDatabase();
    TraversalDescription sideBase = db.traversalDescription().breadthFirst().uniqueness(NODE_PATH);
    return db.bidirectionalTraversalDescription().mirroredSides(sideBase.expand(expander)).sideSelector(LEVEL_STOP_DESCENT_ON_RESULT, maxDepth).collisionEvaluator(toDepth(maxDepth)).traverse(start, end);
}