Java tutorial
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import com.orientechnologies.orient.core.exception.OSecurityAccessException; import com.orientechnologies.orient.core.metadata.schema.OClass; import com.orientechnologies.orient.enterprise.channel.binary.OTokenSecurityException; import com.tinkerpop.blueprints.impls.orient.OrientEdgeType; import com.tinkerpop.blueprints.impls.orient.OrientVertexType; import org.apache.commons.io.FilenameUtils; import org.normandra.DatabaseConstruction; import org.normandra.NormandraException; import org.normandra.cache.EntityCacheFactory; import org.normandra.graph.GraphDatabase; import org.normandra.meta.EntityMeta; import org.normandra.meta.GraphMeta; import org.normandra.meta.GraphMetaBuilder; import org.normandra.orientdb.data.*; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.io.File; import java.util.Collections; public class OrientGraphDatabase extends OrientDatabase implements GraphDatabase { public static OrientGraphDatabase createRemote(final String url, final String database, final String userid, final String password, final EntityCacheFactory factory, final DatabaseConstruction mode, final GraphMetaBuilder metaBuilder) { final OrientPool pool = new FixedOrientPool(url, database, userid, password); final GraphMeta meta = metaBuilder.withColumnFactory(columnFactory).create(); return new OrientGraphDatabase(url, pool, factory, mode, meta); } public static OrientGraphDatabase createLocalFile(final File path, final String database, final EntityCacheFactory factory, final DatabaseConstruction mode, final GraphMetaBuilder metaBuilder) { final String url = "plocal:" + FilenameUtils.normalize(path.getAbsolutePath()); final OrientPool pool = new LocalFileOrientPool(url, database, "admin", "admin"); final GraphMeta meta = metaBuilder.withColumnFactory(columnFactory).create(); return new OrientGraphDatabase(url, pool, factory, mode, meta); } public static OrientGraphDatabase createLocalServer(final File path, final String database, final String userid, final String password, final EntityCacheFactory factory, final DatabaseConstruction mode, final GraphMetaBuilder metaBuilder) { final OrientPool pool = new LocalServerOrientPool(path, database, userid, password); final GraphMeta meta = metaBuilder.withColumnFactory(columnFactory).create(); return new OrientGraphDatabase("remote:localhost", pool, factory, mode, meta); } private static final Logger logger = LoggerFactory.getLogger(OrientGraphDatabase.class); private final GraphMeta meta; protected OrientGraphDatabase(final String url, final OrientPool pool, final EntityCacheFactory cache, final DatabaseConstruction mode, final GraphMeta meta) { super(url, pool, cache, mode, meta); this.meta = meta; } @Override public GraphMeta getMeta() { return this.meta; } @Override public OrientGraph createGraph() { final boolean autotx = "true".equalsIgnoreCase(System.getProperty("graph.autoStartTx", "false")); final boolean useLightweightEdges = "true" .equalsIgnoreCase(System.getProperty("graph.useLightweightEdges", "false")); final int retries = 5; for (int i = 0; i < retries; i++) { final ODatabaseDocument db = this.pool.acquire(); try { if (!(db instanceof ODatabaseDocumentInternal)) { throw new IllegalStateException( "Expected database document internal type, but found [" + db.getClass() + "]."); } final ODatabaseDocumentInternal internal = (ODatabaseDocumentInternal) db; final com.tinkerpop.blueprints.impls.orient.OrientGraph api = new com.tinkerpop.blueprints.impls.orient.OrientGraph( internal, autotx); if (api.isUseLightweightEdges() != useLightweightEdges) { api.setUseLightweightEdges(useLightweightEdges); } return new OrientGraph(this.meta, api, this.statementsByName, this.cache.create()); } catch (final OSecurityAccessException e) { logger.warn("Unable to create orient graph from session [access] (retry " + (i + 1) + ").", e); db.close(); } catch (final OTokenSecurityException e) { logger.warn("Unable to create orient graph from session [token] (retry " + (i + 1) + ").", e); db.close(); } } throw new IllegalStateException("Unable to create orient graph from database session."); } @Override public void refresh() throws NormandraException { if (DatabaseConstruction.NONE.equals(this.constructionMode)) { return; } super.refresh(); try (final ODatabase database = this.pool.acquire()) { final OClass vertexClass = database.getMetadata().getSchema() .getOrCreateClass(OrientVertexType.CLASS_NAME); for (final EntityMeta entityMeta : this.meta.getNodeEntities()) { final String schemaName = entityMeta.getTable(); final OClass schemaClass = database.getMetadata().getSchema().getClass(schemaName); if (schemaClass != null && !schemaClass.getSuperClassesNames().contains(vertexClass.getName())) { schemaClass.setSuperClasses(Collections.singletonList(vertexClass)); logger.debug("Altering class [" + schemaName + "] with vertex superclass."); } } final OClass edgeClass = database.getMetadata().getSchema().getOrCreateClass(OrientEdgeType.CLASS_NAME); for (final EntityMeta entityMeta : this.meta.getEdgeEntities()) { final String schemaName = entityMeta.getTable(); final OClass schemaClass = database.getMetadata().getSchema().getClass(schemaName); if (schemaClass != null && !schemaClass.getSuperClassesNames().contains(edgeClass.getName())) { schemaClass.setSuperClasses(Collections.singletonList(edgeClass)); logger.debug("Altering class [" + schemaName + "] with edge superclass."); } } } } }