Examples with Schema org.neo4j.graphdb.schema.Schema used on opensource projects

Example 6 with Schema

use of org.neo4j.graphdb.schema.Schema in project neo4j-apoc-procedures by neo4j-contrib.

the class NodesAndRelsSubGraph method getIndexes.

@Override
public Iterable<IndexDefinition> getIndexes() {
    Schema schema = db.schema();
    ArrayList<IndexDefinition> indexes = new ArrayList<>(labels.size() * 2);
    for (String label : labels) {
        Iterables.addAll(indexes, schema.getIndexes(Label.label(label)));
    }
    return indexes;
}

Example 7 with Schema

use of org.neo4j.graphdb.schema.Schema in project neo4j by neo4j.

the class FulltextProcedures method awaitOnline.

private void awaitOnline(IndexDescriptor index) {
    // We do the isAdded check on the transaction state first, because indexGetState will grab a schema read-lock, which can deadlock on the write-lock
    // held by the index populator. Also, if the index was created in this transaction, then we will never see it come online in this transaction anyway.
    // Indexes don't come online until the transaction that creates them has committed.
    KernelTransactionImplementation txImpl = (KernelTransactionImplementation) this.tx;
    if (!txImpl.hasTxStateWithChanges() || !txImpl.txState().indexDiffSetsBySchema(index.schema()).isAdded(index)) {
        // If the index was not created in this transaction, then wait for it to come online before querying.
        Schema schema = transaction.schema();
        schema.awaitIndexOnline(index.getName(), INDEX_ONLINE_QUERY_TIMEOUT_SECONDS, TimeUnit.SECONDS);
    }
// If the index was created in this transaction, then we skip this check entirely.
// We will get an exception later, when we try to get an IndexReader, so this is fine.
}

Example 8 with Schema

use of org.neo4j.graphdb.schema.Schema in project neo4j by neo4j.

the class SchemaImplTest method testGetIndexPopulationProgress.

@Test
void testGetIndexPopulationProgress() throws Exception {
    assertFalse(indexExists(USER_LABEL));
    // Create some nodes
    try (Transaction tx = db.beginTx()) {
        Label label = Label.label("User");
        // Create a huge bunch of users so the index takes a while to build
        for (int id = 0; id < 100000; id++) {
            Node userNode = tx.createNode(label);
            userNode.setProperty("username", "user" + id + "@neo4j.org");
        }
        tx.commit();
    }
    // Create an index
    IndexDefinition indexDefinition;
    try (Transaction tx = db.beginTx()) {
        Schema schema = tx.schema();
        indexDefinition = schema.indexFor(USER_LABEL).on("username").create();
        tx.commit();
    }
    // Get state and progress
    try (Transaction tx = db.beginTx()) {
        Schema schema = tx.schema();
        Schema.IndexState state;
        IndexPopulationProgress progress;
        do {
            state = schema.getIndexState(indexDefinition);
            progress = schema.getIndexPopulationProgress(indexDefinition);
            assertTrue(progress.getCompletedPercentage() >= 0);
            assertTrue(progress.getCompletedPercentage() <= 100);
            Thread.sleep(10);
        } while (state == Schema.IndexState.POPULATING);
        assertSame(state, Schema.IndexState.ONLINE);
        assertEquals(100.0, progress.getCompletedPercentage(), 0.0001);
    }
}

Example 9 with Schema

use of org.neo4j.graphdb.schema.Schema in project neo4j by neo4j.

the class SchemaAcceptanceTest method shouldThrowConstraintViolationIfAskedToIndexSamePropertyAndLabelTwiceInSameTx.

@Test
public void shouldThrowConstraintViolationIfAskedToIndexSamePropertyAndLabelTwiceInSameTx() throws Exception {
    // WHEN
    try (Transaction tx = db.beginTx()) {
        Schema schema = db.schema();
        schema.indexFor(label).on(propertyKey).create();
        try {
            schema.indexFor(label).on(propertyKey).create();
            fail("Should not have validated");
        } catch (ConstraintViolationException e) {
            assertEquals("There already exists an index for label 'MY_LABEL' on property 'my_property_key'.", e.getMessage());
        }
        tx.success();
    }
}

Example 10 with Schema

use of org.neo4j.graphdb.schema.Schema in project neo4j-apoc-procedures by neo4j-contrib.

the class Meta method collectMetaData.

private Map<String, Map<String, MetaResult>> collectMetaData() {
    Map<String, Map<String, MetaResult>> metaData = new LinkedHashMap<>(100);
    Schema schema = db.schema();
    Map<String, Iterable<ConstraintDefinition>> relConstraints = new HashMap<>(20);
    for (RelationshipType type : db.getAllRelationshipTypesInUse()) {
        metaData.put(type.name(), new LinkedHashMap<>(10));
        relConstraints.put(type.name(), schema.getConstraints(type));
    }
    for (Label label : db.getAllLabelsInUse()) {
        Map<String, MetaResult> nodeMeta = new LinkedHashMap<>(50);
        String labelName = label.name();
        metaData.put(labelName, nodeMeta);
        Iterable<ConstraintDefinition> constraints = schema.getConstraints(label);
        Set<String> indexed = new LinkedHashSet<>();
        for (IndexDefinition index : schema.getIndexes(label)) {
            for (String prop : index.getPropertyKeys()) {
                indexed.add(prop);
            }
        }
        try (ResourceIterator<Node> nodes = db.findNodes(label)) {
            int count = 0;
            while (nodes.hasNext() && count++ < SAMPLE) {
                Node node = nodes.next();
                addRelationships(metaData, nodeMeta, labelName, node, relConstraints);
                addProperties(nodeMeta, labelName, constraints, indexed, node, node);
            }
        }
    }
    return metaData;
}