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

Example 26 with NodeValueIndexCursor

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

the class DefaultPooledCursorsTestBase method shouldReuseNodeValueIndexCursor.

@Test
void shouldReuseNodeValueIndexCursor() throws Exception {
    int prop = token.propertyKey("prop");
    IndexDescriptor indexDescriptor = tx.schemaRead().indexGetForName(NODE_PROP_INDEX_NAME);
    Predicates.awaitEx(() -> tx.schemaRead().indexGetState(indexDescriptor) == ONLINE, 1, MINUTES);
    IndexReadSession indexSession = tx.dataRead().indexReadSession(indexDescriptor);
    NodeValueIndexCursor c1 = cursors.allocateNodeValueIndexCursor(NULL, EmptyMemoryTracker.INSTANCE);
    read.nodeIndexSeek(indexSession, c1, IndexQueryConstraints.unconstrained(), PropertyIndexQuery.exact(prop, "zero"));
    c1.close();
    NodeValueIndexCursor c2 = cursors.allocateNodeValueIndexCursor(NULL, EmptyMemoryTracker.INSTANCE);
    assertThat(c1).isSameAs(c2);
    c2.close();
}

Example 27 with NodeValueIndexCursor

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

the class TransactionImpl method nodesByLabelAndProperties.

private ResourceIterator<Node> nodesByLabelAndProperties(KernelTransaction transaction, int labelId, PropertyIndexQuery.ExactPredicate... queries) {
    Read read = transaction.dataRead();
    if (isInvalidQuery(labelId, queries)) {
        return emptyResourceIterator();
    }
    int[] propertyIds = getPropertyIds(queries);
    IndexDescriptor index = findUsableMatchingCompositeIndex(transaction, SchemaDescriptor.forLabel(labelId, propertyIds), propertyIds, () -> transaction.schemaRead().indexesGetForLabel(labelId));
    if (index != IndexDescriptor.NO_INDEX) {
        try {
            NodeValueIndexCursor cursor = transaction.cursors().allocateNodeValueIndexCursor(transaction.cursorContext(), transaction.memoryTracker());
            IndexReadSession indexSession = read.indexReadSession(index);
            read.nodeIndexSeek(indexSession, cursor, unconstrained(), getReorderedIndexQueries(index.schema().getPropertyIds(), queries));
            return new CursorIterator<>(cursor, NodeIndexCursor::nodeReference, c -> newNodeEntity(c.nodeReference()), coreApiResourceTracker);
        } catch (KernelException e) {
        // weird at this point but ignore and fallback to a label scan
        }
    }
    return getNodesByLabelAndPropertyWithoutPropertyIndex(transaction, labelId, queries);
}

Example 28 with NodeValueIndexCursor

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

the class TransactionImpl method nodesByLabelAndProperty.

private ResourceIterator<Node> nodesByLabelAndProperty(KernelTransaction transaction, int labelId, PropertyIndexQuery query) {
    Read read = transaction.dataRead();
    if (query.propertyKeyId() == TokenRead.NO_TOKEN || labelId == TokenRead.NO_TOKEN) {
        return emptyResourceIterator();
    }
    var index = findUsableMatchingIndex(transaction, SchemaDescriptor.forLabel(labelId, query.propertyKeyId()));
    if (index != IndexDescriptor.NO_INDEX) {
        // Ha! We found an index - let's use it to find matching nodes
        try {
            NodeValueIndexCursor cursor = transaction.cursors().allocateNodeValueIndexCursor(transaction.cursorContext(), transaction.memoryTracker());
            IndexReadSession indexSession = read.indexReadSession(index);
            read.nodeIndexSeek(indexSession, cursor, unconstrained(), query);
            return new CursorIterator<>(cursor, NodeIndexCursor::nodeReference, c -> newNodeEntity(c.nodeReference()), coreApiResourceTracker);
        } catch (KernelException e) {
        // weird at this point but ignore and fallback to a label scan
        }
    }
    return getNodesByLabelAndPropertyWithoutPropertyIndex(transaction, labelId, query);
}

Example 29 with NodeValueIndexCursor

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

the class UniquenessConstraintValidationIT method addingUniqueNodeWithUnrelatedValueShouldNotAffectLookup.

@Test
void addingUniqueNodeWithUnrelatedValueShouldNotAffectLookup() throws Exception {
    // given
    ConstraintDescriptor constraint = createConstraint("Person", "id");
    long ourNode;
    {
        KernelTransaction transaction = newTransaction(AnonymousContext.writeToken());
        ourNode = createLabeledNode(transaction, "Person", "id", 1);
        commit();
    }
    KernelTransaction transaction = newTransaction(AnonymousContext.writeToken());
    TokenRead tokenRead = transaction.tokenRead();
    int propId = tokenRead.propertyKey("id");
    IndexDescriptor idx = transaction.schemaRead().indexGetForName(constraint.getName());
    // when
    createLabeledNode(transaction, "Person", "id", 2);
    // then I should find the original node
    try (NodeValueIndexCursor cursor = transaction.cursors().allocateNodeValueIndexCursor(transaction.cursorContext(), transaction.memoryTracker())) {
        assertThat(transaction.dataRead().lockingNodeUniqueIndexSeek(idx, cursor, exact(propId, Values.of(1)))).isEqualTo(ourNode);
    }
    commit();
}

Example 30 with NodeValueIndexCursor

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

the class UniquenessConstraintValidationIT method unrelatedNodesWithSamePropertyShouldNotInterfereWithUniquenessCheck.

@Test
void unrelatedNodesWithSamePropertyShouldNotInterfereWithUniquenessCheck() throws Exception {
    // given
    ConstraintDescriptor constraint = createConstraint("Person", "id");
    long ourNode;
    {
        KernelTransaction transaction = newTransaction(AnonymousContext.writeToken());
        ourNode = createLabeledNode(transaction, "Person", "id", 1);
        createLabeledNode(transaction, "Item", "id", 2);
        commit();
    }
    KernelTransaction transaction = newTransaction(AnonymousContext.writeToken());
    TokenRead tokenRead = transaction.tokenRead();
    int propId = tokenRead.propertyKey("id");
    IndexDescriptor idx = transaction.schemaRead().indexGetForName(constraint.getName());
    // when
    createLabeledNode(transaction, "Item", "id", 2);
    // then I should find the original node
    try (NodeValueIndexCursor cursor = transaction.cursors().allocateNodeValueIndexCursor(transaction.cursorContext(), transaction.memoryTracker())) {
        assertThat(transaction.dataRead().lockingNodeUniqueIndexSeek(idx, cursor, exact(propId, Values.of(1)))).isEqualTo(ourNode);
    }
    commit();
}