Examples with NodeLabelIndexCursor org.neo4j.internal.kernel.api.NodeLabelIndexCursor used on opensource projects

Example 1 with NodeLabelIndexCursor

use of org.neo4j.internal.kernel.api.NodeLabelIndexCursor in project neo4j by neo4j.

the class NodeScanIT method trackPageCacheAccessOnNodeLabelScan.

@Test
void trackPageCacheAccessOnNodeLabelScan() throws KernelException {
    var testLabel = Label.label("testLabel");
    try (KernelTransaction tx = kernel.beginTransaction(IMPLICIT, read())) {
        var cursorContext = tx.cursorContext();
        assertThat(cursorContext.getCursorTracer().pins()).isZero();
        var label = tx.tokenRead().nodeLabel(testLabel.name());
        IndexDescriptor index = tx.schemaRead().index(SchemaDescriptor.forAnyEntityTokens(EntityType.NODE)).next();
        TokenReadSession tokenReadSession = tx.dataRead().tokenReadSession(index);
        try (NodeLabelIndexCursor cursor = tx.cursors().allocateNodeLabelIndexCursor(cursorContext)) {
            tx.dataRead().nodeLabelScan(tokenReadSession, cursor, IndexQueryConstraints.unconstrained(), new TokenPredicate(label));
            assertThat(cursorContext.getCursorTracer().pins()).isNotZero();
        }
    }
}

Example 2 with NodeLabelIndexCursor

use of org.neo4j.internal.kernel.api.NodeLabelIndexCursor in project neo4j by neo4j.

the class ParallelNodeLabelScanTestBase method shouldScanAllNodesFromRandomlySizedWorkers.

@Test
void shouldScanAllNodesFromRandomlySizedWorkers() throws InterruptedException {
    // given
    ExecutorService service = Executors.newFixedThreadPool(4);
    Scan<NodeLabelIndexCursor> scan = read.nodeLabelScan(FOO_LABEL);
    CursorFactory cursors = testSupport.kernelToTest().cursors();
    try {
        // when
        List<Future<LongList>> futures = new ArrayList<>();
        for (int i = 0; i < 10; i++) {
            futures.add(service.submit(randomBatchWorker(scan, () -> cursors.allocateNodeLabelIndexCursor(NULL), NODE_GET)));
        }
        // then
        List<LongList> lists = futures.stream().map(TestUtils::unsafeGet).collect(Collectors.toList());
        assertDistinct(lists);
        assertEquals(FOO_NODES, LongSets.immutable.withAll(concat(lists)));
    } finally {
        service.shutdown();
        service.awaitTermination(1, TimeUnit.MINUTES);
    }
}

Example 3 with NodeLabelIndexCursor

use of org.neo4j.internal.kernel.api.NodeLabelIndexCursor in project neo4j by neo4j.

the class ParallelNodeLabelScanTestBase method shouldScanASubsetOfNodes.

@Test
void shouldScanASubsetOfNodes() {
    try (NodeLabelIndexCursor nodes = cursors.allocateNodeLabelIndexCursor(NULL)) {
        for (int label : ALL_LABELS) {
            Scan<NodeLabelIndexCursor> scan = read.nodeLabelScan(label);
            assertTrue(scan.reserveBatch(nodes, 11));
            MutableLongList found = LongLists.mutable.empty();
            while (nodes.next()) {
                found.add(nodes.nodeReference());
            }
            assertThat(found.size()).isGreaterThan(0);
            if (label == FOO_LABEL) {
                assertTrue(FOO_NODES.containsAll(found));
                assertTrue(found.noneSatisfy(f -> BAR_NODES.contains(f)));
            } else if (label == BAR_LABEL) {
                assertTrue(BAR_NODES.containsAll(found));
                assertTrue(found.noneSatisfy(f -> FOO_NODES.contains(f)));
            } else {
                fail();
            }
        }
    }
}

Example 4 with NodeLabelIndexCursor

use of org.neo4j.internal.kernel.api.NodeLabelIndexCursor in project neo4j by neo4j.

the class ParallelNodeLabelScanTestBase method shouldHandleSizeHintOverflow.

@Test
void shouldHandleSizeHintOverflow() {
    try (NodeLabelIndexCursor nodes = cursors.allocateNodeLabelIndexCursor(NULL)) {
        // when
        Scan<NodeLabelIndexCursor> scan = read.nodeLabelScan(FOO_LABEL);
        assertTrue(scan.reserveBatch(nodes, NUMBER_OF_NODES * 2));
        MutableLongList ids = LongLists.mutable.empty();
        while (nodes.next()) {
            ids.add(nodes.nodeReference());
        }
        assertEquals(FOO_NODES.size(), ids.size());
        assertTrue(FOO_NODES.containsAll(ids));
        assertTrue(ids.noneSatisfy(f -> BAR_NODES.contains(f)));
    }
}

Example 5 with NodeLabelIndexCursor

use of org.neo4j.internal.kernel.api.NodeLabelIndexCursor in project neo4j by neo4j.

the class ParallelNodeLabelScanTransactionStateTestBase method scanShouldSeeAddedNodes.

@Test
void scanShouldSeeAddedNodes() throws Exception {
    int size = 64;
    int label = label("L");
    MutableLongSet existing = LongSets.mutable.withAll(createNodesWithLabel(label, size));
    try (KernelTransaction tx = beginTransaction()) {
        MutableLongSet added = LongSets.mutable.withAll(createNodesWithLabel(tx.dataWrite(), label, size));
        try (NodeLabelIndexCursor cursor = tx.cursors().allocateNodeLabelIndexCursor(tx.cursorContext())) {
            Scan<NodeLabelIndexCursor> scan = tx.dataRead().nodeLabelScan(label);
            Set<Long> seen = new HashSet<>();
            while (scan.reserveBatch(cursor, 64)) {
                while (cursor.next()) {
                    long nodeId = cursor.nodeReference();
                    assertTrue(seen.add(nodeId), format("%d was seen multiple times", nodeId));
                    assertTrue(existing.remove(nodeId) || added.remove(nodeId));
                }
            }
            // make sure we have seen all nodes
            assertTrue(existing.isEmpty());
            assertTrue(added.isEmpty());
        }
    }
}