| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.atlas.repository.graphdb.titan1; |
| |
| import java.math.BigDecimal; |
| import java.math.BigInteger; |
| import java.util.ArrayList; |
| |
| import org.apache.atlas.ApplicationProperties; |
| import org.apache.atlas.AtlasException; |
| import org.apache.atlas.repository.graphdb.AtlasGraph; |
| import org.apache.atlas.repository.graphdb.GraphDatabase; |
| import org.apache.atlas.repository.graphdb.titan1.serializer.BigDecimalSerializer; |
| import org.apache.atlas.repository.graphdb.titan1.serializer.BigIntegerSerializer; |
| import org.apache.atlas.repository.graphdb.titan1.serializer.StringListSerializer; |
| import org.apache.atlas.repository.graphdb.titan1.serializer.TypeCategorySerializer; |
| import org.apache.atlas.typesystem.types.DataTypes.TypeCategory; |
| import org.apache.commons.configuration.Configuration; |
| import org.apache.tinkerpop.gremlin.groovy.loaders.SugarLoader; |
| import org.apache.tinkerpop.gremlin.structure.io.graphson.GraphSONMapper; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.thinkaurelius.titan.core.TitanFactory; |
| import com.thinkaurelius.titan.core.TitanGraph; |
| import com.thinkaurelius.titan.core.schema.TitanManagement; |
| import com.thinkaurelius.titan.core.util.TitanCleanup; |
| import com.thinkaurelius.titan.graphdb.tinkerpop.TitanIoRegistry; |
| |
| /** |
| * Default implementation for Graph Provider that doles out Titan Graph. |
| */ |
| public class Titan1GraphDatabase implements GraphDatabase<Titan1Vertex, Titan1Edge> { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(Titan1GraphDatabase.class); |
| |
| /** |
| * Constant for the configuration property that indicates the prefix. |
| */ |
| public static final String GRAPH_PREFIX = "atlas.graph"; |
| |
| public static final String INDEX_BACKEND_CONF = "index.search.backend"; |
| |
| public static final String INDEX_BACKEND_LUCENE = "lucene"; |
| |
| public static final String INDEX_BACKEND_ES = "elasticsearch"; |
| |
| private static volatile Titan1Graph atlasGraphInstance = null; |
| private static volatile TitanGraph graphInstance; |
| |
| public Titan1GraphDatabase() { |
| |
| //update registry |
| GraphSONMapper.build().addRegistry(TitanIoRegistry.INSTANCE).create(); |
| } |
| |
| public static Configuration getConfiguration() throws AtlasException { |
| Configuration configProperties = ApplicationProperties.get(); |
| |
| Configuration titanConfig = ApplicationProperties.getSubsetConfiguration(configProperties, GRAPH_PREFIX); |
| |
| //add serializers for non-standard property value types that Atlas uses |
| |
| titanConfig.addProperty("attributes.custom.attribute1.attribute-class", TypeCategory.class.getName()); |
| titanConfig.addProperty("attributes.custom.attribute1.serializer-class", |
| TypeCategorySerializer.class.getName()); |
| |
| //not ideal, but avoids making large changes to Atlas |
| titanConfig.addProperty("attributes.custom.attribute2.attribute-class", ArrayList.class.getName()); |
| titanConfig.addProperty("attributes.custom.attribute2.serializer-class", StringListSerializer.class.getName()); |
| |
| titanConfig.addProperty("attributes.custom.attribute3.attribute-class", BigInteger.class.getName()); |
| titanConfig.addProperty("attributes.custom.attribute3.serializer-class", BigIntegerSerializer.class.getName()); |
| |
| titanConfig.addProperty("attributes.custom.attribute4.attribute-class", BigDecimal.class.getName()); |
| titanConfig.addProperty("attributes.custom.attribute4.serializer-class", BigDecimalSerializer.class.getName()); |
| |
| return titanConfig; |
| } |
| |
| public static TitanGraph getGraphInstance() { |
| if (graphInstance == null) { |
| synchronized (Titan1GraphDatabase.class) { |
| if (graphInstance == null) { |
| Configuration config; |
| try { |
| config = getConfiguration(); |
| } catch (AtlasException e) { |
| throw new RuntimeException(e); |
| } |
| |
| graphInstance = TitanFactory.open(config); |
| atlasGraphInstance = new Titan1Graph(); |
| validateIndexBackend(config); |
| } |
| } |
| } |
| return graphInstance; |
| } |
| |
| public static void unload() { |
| synchronized (Titan1GraphDatabase.class) { |
| |
| if (graphInstance == null) { |
| return; |
| } |
| graphInstance.tx().commit(); |
| graphInstance.close(); |
| graphInstance = null; |
| } |
| } |
| |
| static void validateIndexBackend(Configuration config) { |
| String configuredIndexBackend = config.getString(INDEX_BACKEND_CONF); |
| |
| TitanManagement managementSystem = getGraphInstance().openManagement(); |
| String currentIndexBackend = managementSystem.get(INDEX_BACKEND_CONF); |
| managementSystem.commit(); |
| |
| if (!configuredIndexBackend.equals(currentIndexBackend)) { |
| throw new RuntimeException("Configured Index Backend " + configuredIndexBackend |
| + " differs from earlier configured Index Backend " + currentIndexBackend + ". Aborting!"); |
| } |
| |
| } |
| |
| @Override |
| public boolean isGraphLoaded() { |
| return graphInstance != null; |
| } |
| |
| @Override |
| public void initializeTestGraph() { |
| //nothing to do |
| |
| } |
| |
| @Override |
| public void cleanup() { |
| try { |
| getGraphInstance().close(); |
| } catch (Throwable t) { |
| LOG.warn("Could not close test TitanGraph", t); |
| t.printStackTrace(); |
| } |
| |
| try { |
| TitanCleanup.clear(getGraphInstance()); |
| } catch (Throwable t) { |
| LOG.warn("Could not clear test TitanGraph", t); |
| t.printStackTrace(); |
| } |
| } |
| |
| @Override |
| public AtlasGraph<Titan1Vertex, Titan1Edge> getGraph() { |
| getGraphInstance(); |
| return atlasGraphInstance; |
| } |
| } |