Examples with NodePropertyAccessor org.neo4j.storageengine.api.NodePropertyAccessor used on opensource projects

Example 1 with NodePropertyAccessor

use of org.neo4j.storageengine.api.NodePropertyAccessor in project neo4j by neo4j.

the class ConstraintIndexCreator method createUniquenessConstraintIndex.

/**
 * You MUST hold a label write lock before you call this method.
 * However the label write lock is temporarily released while populating the index backing the constraint.
 * It goes a little like this:
 * <ol>
 * <li>Prerequisite: Getting here means that there's an open schema transaction which has acquired the
 * LABEL WRITE lock.</li>
 * <li>Index schema rule which is backing the constraint is created in a nested mini-transaction
 * which doesn't acquire any locking, merely adds tx state and commits so that the index rule is applied
 * to the store, which triggers the index population</li>
 * <li>Release the LABEL WRITE lock</li>
 * <li>Await index population to complete</li>
 * <li>Acquire the LABEL WRITE lock (effectively blocking concurrent transactions changing
 * data related to this constraint, and it so happens, most other transactions as well) and verify
 * the uniqueness of the built index</li>
 * <li>Leave this method, knowing that the uniqueness constraint rule will be added to tx state
 * and this tx committed, which will create the uniqueness constraint</li>
 * </ol>
 */
public IndexDescriptor createUniquenessConstraintIndex(KernelTransactionImplementation transaction, IndexBackedConstraintDescriptor constraint, IndexPrototype prototype) throws TransactionFailureException, CreateConstraintFailureException, UniquePropertyValueValidationException, AlreadyConstrainedException {
    String constraintString = constraint.userDescription(transaction.tokenRead());
    log.info("Starting constraint creation: %s.", constraintString);
    IndexDescriptor index;
    SchemaRead schemaRead = transaction.schemaRead();
    try {
        index = checkAndCreateConstraintIndex(schemaRead, transaction.tokenRead(), constraint, prototype);
    } catch (AlreadyConstrainedException e) {
        throw e;
    } catch (KernelException e) {
        throw new CreateConstraintFailureException(constraint, e);
    }
    boolean success = false;
    boolean reacquiredLabelLock = false;
    Client locks = transaction.lockClient();
    ResourceType keyType = constraint.schema().keyType();
    long[] lockingKeys = constraint.schema().lockingKeys();
    try {
        locks.acquireShared(transaction.lockTracer(), keyType, lockingKeys);
        IndexProxy proxy = indexingService.getIndexProxy(index);
        // Release the LABEL WRITE lock during index population.
        // At this point the integrity of the constraint to be created was checked
        // while holding the lock and the index rule backing the soon-to-be-created constraint
        // has been created. Now it's just the population left, which can take a long time
        locks.releaseExclusive(keyType, lockingKeys);
        awaitConstraintIndexPopulation(constraint, proxy, transaction);
        log.info("Constraint %s populated, starting verification.", constraintString);
        // Index population was successful, but at this point we don't know if the uniqueness constraint holds.
        // Acquire LABEL WRITE lock and verify the constraints here in this user transaction
        // and if everything checks out then it will be held until after the constraint has been
        // created and activated.
        locks.acquireExclusive(transaction.lockTracer(), keyType, lockingKeys);
        reacquiredLabelLock = true;
        try (NodePropertyAccessor propertyAccessor = new DefaultNodePropertyAccessor(transaction.newStorageReader(), transaction.cursorContext(), transaction.memoryTracker())) {
            indexingService.getIndexProxy(index).verifyDeferredConstraints(propertyAccessor);
        }
        log.info("Constraint %s verified.", constraintString);
        success = true;
        return index;
    } catch (IndexNotFoundKernelException e) {
        String indexString = index.userDescription(transaction.tokenRead());
        throw new TransactionFailureException(format("Index (%s) that we just created does not exist.", indexString), e);
    } catch (IndexEntryConflictException e) {
        throw new UniquePropertyValueValidationException(constraint, VERIFICATION, e, transaction.tokenRead());
    } catch (InterruptedException | IOException e) {
        throw new CreateConstraintFailureException(constraint, e);
    } finally {
        if (!success) {
            if (!reacquiredLabelLock) {
                locks.acquireExclusive(transaction.lockTracer(), keyType, lockingKeys);
            }
            if (indexStillExists(schemaRead, index)) {
                dropUniquenessConstraintIndex(index);
            }
        }
    }
}

Example 2 with NodePropertyAccessor

use of org.neo4j.storageengine.api.NodePropertyAccessor in project neo4j by neo4j.

the class PartitionedUniquenessVerifierTest method verifyPropertyUpdates.

@Test
void verifyPropertyUpdates() throws Exception {
    PartitionedUniquenessVerifier verifier = createPartitionedVerifier();
    NodePropertyAccessor nodePropertyAccessor = mock(NodePropertyAccessor.class);
    verifier.verify(nodePropertyAccessor, new int[] { 42 }, valueTupleList("a", "b"));
    verifySearchInvocations(searcher1, "a", "b");
    verifySearchInvocations(searcher2, "a", "b");
    verifySearchInvocations(searcher3, "a", "b");
}

Example 3 with NodePropertyAccessor

use of org.neo4j.storageengine.api.NodePropertyAccessor in project neo4j by neo4j.

the class SimpleUniquenessVerifierTest method populationVerificationNoDuplicates.

@Test
void populationVerificationNoDuplicates() throws Exception {
    List<Object> data = asList("string1", "42", "43", "44", "45L", "(byte) 46", "47.0", "(float) 48.1", "string2");
    NodePropertyAccessor nodePropertyAccessor = newPropertyAccessor(data);
    insert(data);
    assertNoDuplicates(nodePropertyAccessor);
}

Example 4 with NodePropertyAccessor

use of org.neo4j.storageengine.api.NodePropertyAccessor in project neo4j by neo4j.

the class MultipleIndexPopulatorTest method testMultiplePropertyUpdateFailures.

@Test
void testMultiplePropertyUpdateFailures() throws IndexEntryConflictException, FlipFailedKernelException {
    NodePropertyAccessor nodePropertyAccessor = mock(NodePropertyAccessor.class);
    IndexEntryUpdate<?> update1 = add(1, index1, "foo");
    IndexEntryUpdate<?> update2 = add(2, index1, "bar");
    IndexUpdater updater = mock(IndexUpdater.class);
    IndexPopulator populator = createIndexPopulator(updater);
    addPopulator(populator, 1);
    doThrow(getPopulatorException()).when(updater).process(any(IndexEntryUpdate.class));
    IndexUpdater multipleIndexUpdater = multipleIndexPopulator.newPopulatingUpdater(nodePropertyAccessor, NULL);
    multipleIndexUpdater.process(update1);
    multipleIndexUpdater.process(update2);
    verify(updater).process(update1);
    verify(updater, never()).process(update2);
    verify(updater).close();
    checkPopulatorFailure(populator);
}

Example 5 with NodePropertyAccessor

use of org.neo4j.storageengine.api.NodePropertyAccessor in project neo4j by neo4j.

the class SimpleUniquenessVerifierTest method updatesVerificationNoDuplicates.

@Test
void updatesVerificationNoDuplicates() throws Exception {
    List<Object> data = asList("lucene", "1337975550", "43.10", 'a', 'b', 'c', "(byte) 12");
    NodePropertyAccessor nodePropertyAccessor = newPropertyAccessor(data);
    insert(data);
    assertNoDuplicatesCreated(nodePropertyAccessor, valueTupleList("1337975550", 'c', "(byte) 12"));
}