private static void setLabelSystem() {
IndexDefinition indexDefinition;
try (Transaction tx = graphDb.beginTx()) {
Schema schema = graphDb.schema();
indexDefinition = schema.indexFor(DynamicLabel.label("Nome")).on("name").create();
tx.success();
}
try (Transaction tx = graphDb.beginTx()) {
Schema schema = graphDb.schema();
schema.awaitIndexOnline(indexDefinition, 10, TimeUnit.SECONDS);
}
}
protected void waitUntilIndexesAreOnline() {
LOGGER.debug("Waiting for Indizes to Come Online.");
try (Transaction ignored = graphDatabase.beginTx()) {
graphDatabase.schema().awaitIndexesOnline(120, TimeUnit.SECONDS);
LOGGER.debug("Indizes are online");
}
}
public IndexDefinition _createIndex(Label label, String key) {
Schema schema = graphDb.schema();
for (IndexDefinition index : schema.getIndexes(label))
for (String property : index.getPropertyKeys())
if (property.equals(key)) return index; // already existing
return schema.indexFor(label).on(key).create();
}
public ConstraintDefinition _createConstrant(Label label, String key) {
Schema schema = graphDb.schema();
for (ConstraintDefinition constraint : schema.getConstraints(label))
for (String property : constraint.getPropertyKeys())
if (property.equals(key)) return constraint; // already existing
return schema.constraintFor(label).assertPropertyIsUnique(key).create();
}
@Test
public void nodeCanBecomeSchemaIndexableInBeforeCommitByAddingLabel() throws Exception {
// Given we have a schema index...
GraphDatabaseService db = dbRule.getGraphDatabaseService();
final Label label = DynamicLabel.label("Label");
IndexDefinition index;
try (Transaction tx = db.beginTx()) {
index = db.schema().indexFor(label).on("indexed").create();
tx.success();
}
// ... and a transaction event handler that likes to add the indexed property on nodes
db.registerTransactionEventHandler(
new TransactionEventHandler.Adapter<Object>() {
@Override
public Object beforeCommit(TransactionData data) throws Exception {
Iterator<Node> nodes = data.createdNodes().iterator();
if (nodes.hasNext()) {
Node node = nodes.next();
node.addLabel(label);
}
return null;
}
});
// When we create a node with the right property, but not the right label...
try (Transaction tx = db.beginTx()) {
db.schema().awaitIndexesOnline(10, TimeUnit.SECONDS);
Node node = db.createNode();
node.setProperty("indexed", "value");
node.setProperty("random", 42);
tx.success();
}
// Then we should be able to look it up through the index.
try (Transaction ignore = db.beginTx()) {
Node node = db.findNode(label, "indexed", "value");
assertThat(node.getProperty("random"), is((Object) 42));
}
}
@Test
public void insert() throws InterruptedException {
// START SNIPPET: insert
BatchInserter inserter = null;
try {
inserter =
BatchInserters.inserter(
new File("target/batchinserter-example").getAbsolutePath(), fileSystem);
Label personLabel = DynamicLabel.label("Person");
inserter.createDeferredSchemaIndex(personLabel).on("name").create();
Map<String, Object> properties = new HashMap<>();
properties.put("name", "Mattias");
long mattiasNode = inserter.createNode(properties, personLabel);
properties.put("name", "Chris");
long chrisNode = inserter.createNode(properties, personLabel);
RelationshipType knows = DynamicRelationshipType.withName("KNOWS");
inserter.createRelationship(mattiasNode, chrisNode, knows, null);
} finally {
if (inserter != null) {
inserter.shutdown();
}
}
// END SNIPPET: insert
// try it out from a normal db
GraphDatabaseService db =
new TestGraphDatabaseFactory()
.setFileSystem(fileSystem)
.newImpermanentDatabase(new File("target/batchinserter-example").getAbsolutePath());
try (Transaction tx = db.beginTx()) {
Label personLabelForTesting = DynamicLabel.label("Person");
Node mNode = db.findNode(personLabelForTesting, "name", "Mattias");
Node cNode =
mNode
.getSingleRelationship(DynamicRelationshipType.withName("KNOWS"), Direction.OUTGOING)
.getEndNode();
assertThat((String) cNode.getProperty("name"), is("Chris"));
assertThat(db.schema().getIndexes(personLabelForTesting).iterator().hasNext(), is(true));
} finally {
db.shutdown();
}
}
private File databaseWithUniquenessConstraint(String label, String propertyKey) {
File storeDir = new File(targetDir.directory(), "seed");
GraphDatabaseService graphDb =
new GraphDatabaseFactory().newEmbeddedDatabase(storeDir.getAbsolutePath());
try {
Transaction tx = graphDb.beginTx();
try {
graphDb.schema().constraintFor(label(label)).assertPropertyIsUnique(propertyKey).create();
tx.success();
} finally {
tx.finish();
}
} finally {
graphDb.shutdown();
}
return storeDir;
}
/**
* Defines constraints for the graph property model. Creates indexes for blocks and transactions.
*/
protected void createIndexesAndUniqueConstraints() {
try (Transaction tx = graphDatabase.beginTx()) {
Schema schema = graphDatabase.schema();
if (!schema.getIndexes().iterator().hasNext()) {
LOGGER.debug("Creating Indexes and Unique Constraints.");
schema.constraintFor(LabelType.Block).assertPropertyIsUnique("hash").create();
schema.constraintFor(LabelType.Block).assertPropertyIsUnique("height").create();
// No unique constraints for transactions (see BIP30)
schema.indexFor(LabelType.Transaction).on("hash").create();
schema.constraintFor(LabelType.Address).assertPropertyIsUnique("hash").create();
schema.indexFor(LabelType.Coinbase).on("hash").create();
schema.indexFor(LabelType.LatestBlock).on("height").create();
}
tx.success();
}
}
@Override
public Iterable<ConstraintDefinition> getConstraints() {
return gdb.schema().getConstraints();
}
@Override
public Iterable<IndexDefinition> getIndexes() {
return gdb.schema().getIndexes();
}
