package com.buschmais.cdo.neo4j.impl.datastore;
import com.buschmais.cdo.neo4j.impl.datastore.metadata.IndexedPropertyMetadata;
import com.buschmais.cdo.neo4j.impl.datastore.metadata.NodeMetadata;
import com.buschmais.cdo.neo4j.impl.datastore.metadata.PropertyMetadata;
import com.buschmais.cdo.spi.metadata.method.IndexedPropertyMethodMetadata;
import com.buschmais.cdo.spi.metadata.method.PrimitivePropertyMethodMetadata;
import com.buschmais.cdo.spi.metadata.type.EntityTypeMetadata;
import com.buschmais.cdo.spi.metadata.type.TypeMetadata;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.Label;
import org.neo4j.graphdb.Transaction;
import org.neo4j.graphdb.schema.ConstraintDefinition;
import org.neo4j.graphdb.schema.ConstraintType;
import org.neo4j.graphdb.schema.IndexDefinition;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Collection;
public class EmbeddedNeo4jDatastore extends AbstractNeo4jDatastore<EmbeddedNeo4jDatastoreSession> {
private static final Logger LOGGER = LoggerFactory.getLogger(EmbeddedNeo4jDatastore.class);
private final GraphDatabaseService graphDatabaseService;
public EmbeddedNeo4jDatastore(GraphDatabaseService graphDatabaseService) {
this.graphDatabaseService = graphDatabaseService;
}
@Override
public EmbeddedNeo4jDatastoreSession createSession() {
return new EmbeddedNeo4jDatastoreSession(graphDatabaseService);
}
@Override
public void init(Collection<TypeMetadata> registeredMetadata) {
try (Transaction transaction = graphDatabaseService.beginTx()) {
for (TypeMetadata typeMetadata : registeredMetadata) {
if (typeMetadata instanceof EntityTypeMetadata) {
EntityTypeMetadata<NodeMetadata> entityTypeMetadata = (EntityTypeMetadata<NodeMetadata>) typeMetadata;
IndexedPropertyMethodMetadata<IndexedPropertyMetadata> indexedPropertyMethodMetadata = entityTypeMetadata.getIndexedProperty();
if (indexedPropertyMethodMetadata != null) {
if (indexedPropertyMethodMetadata.getDatastoreMetadata().isCreate()) {
initCreateIndex(entityTypeMetadata, indexedPropertyMethodMetadata.getPropertyMethodMetadata());
}
if (indexedPropertyMethodMetadata.getDatastoreMetadata().isUnique()) {
initUniqueIndex(entityTypeMetadata, indexedPropertyMethodMetadata.getPropertyMethodMetadata());
}
}
}
}
transaction.success();
}
}
private void initUniqueIndex(EntityTypeMetadata<NodeMetadata> entityTypeMetadata, PrimitivePropertyMethodMetadata propertyMethodMetadata) {
Label label = entityTypeMetadata.getDatastoreMetadata().getDiscriminator();
if (label != null && propertyMethodMetadata != null) {
reCreateUniqueConstraint(label, propertyMethodMetadata);
}
}
private void initCreateIndex(EntityTypeMetadata<NodeMetadata> entityTypeMetadata, PrimitivePropertyMethodMetadata propertyMethodMetadata) {
Label label = entityTypeMetadata.getDatastoreMetadata().getDiscriminator();
if (label != null && propertyMethodMetadata != null) {
reCreateIndex(label, propertyMethodMetadata);
}
}
private void reCreateIndex(Label label, PrimitivePropertyMethodMetadata propertyMethodMetadata) {
PropertyMetadata propertyMetadata = ((PrimitivePropertyMethodMetadata<PropertyMetadata>) propertyMethodMetadata).getDatastoreMetadata();
IndexDefinition index = findIndex(label, propertyMetadata.getName());
//TODO propertyMethodMetadata is always != null
if (propertyMethodMetadata != null && index == null) {
LOGGER.info("Creating index for label {} on property '{}'.", label, propertyMetadata.getName());
graphDatabaseService.schema().indexFor(label).on(propertyMetadata.getName()).create();
} else if (propertyMethodMetadata == null && index != null) {
LOGGER.info("Dropping index for label {} on properties '{}'.", label, index.getPropertyKeys());
index.drop();
}
}
private void reCreateUniqueConstraint(Label label, PrimitivePropertyMethodMetadata propertyMethodMetadata) {
PropertyMetadata propertyMetadata = ((PrimitivePropertyMethodMetadata<PropertyMetadata>) propertyMethodMetadata).getDatastoreMetadata();
ConstraintDefinition constraint = findUniqueConstraint(label, propertyMetadata.getName());
//TODO propertyMethodMetadata is always != null
if (propertyMethodMetadata != null && constraint == null) {
LOGGER.info("Creating constraint for label {} on property '{}'.", label, propertyMetadata.getName());
graphDatabaseService.schema().constraintFor(label).assertPropertyIsUnique(propertyMetadata.getName()).create();
} else if (propertyMethodMetadata == null && constraint != null) {
LOGGER.info("Dropping constraint for label {} on properties '{}'.", label, constraint.getPropertyKeys());
constraint.drop();
}
}
private IndexDefinition findIndex(Label label, String propertyName) {
final Iterable<IndexDefinition> indexes = graphDatabaseService.schema().getIndexes(label);
for (IndexDefinition indexDefinition : indexes) {
for (String key : indexDefinition.getPropertyKeys()) {
if (key.equals(propertyName)) {
return indexDefinition;
}
}
}
return null;
}
private ConstraintDefinition findUniqueConstraint(Label label, String propertyName) {
final Iterable<ConstraintDefinition> constraints = graphDatabaseService.schema().getConstraints(label);
for (ConstraintDefinition constraintDefinition : constraints) {
if (constraintDefinition.isConstraintType(ConstraintType.UNIQUENESS)) {
for (String key : constraintDefinition.getPropertyKeys()) {
if (key.equals(propertyName)) {
return constraintDefinition;
}
}
}
}
return null;
}
@Override
public void close() {
graphDatabaseService.shutdown();
}
}