| /** |
| * 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.graph; |
| |
| import com.google.common.collect.ImmutableMap; |
| import com.google.inject.Provides; |
| import com.thinkaurelius.titan.core.TitanFactory; |
| import com.thinkaurelius.titan.core.TitanGraph; |
| import com.thinkaurelius.titan.core.schema.TitanManagement; |
| import com.thinkaurelius.titan.diskstorage.StandardIndexProvider; |
| import com.thinkaurelius.titan.diskstorage.indexing.IndexInformation; |
| import com.thinkaurelius.titan.diskstorage.solr.Solr5Index; |
| import com.thinkaurelius.titan.graphdb.configuration.GraphDatabaseConfiguration; |
| import com.thinkaurelius.titan.graphdb.database.StandardTitanGraph; |
| import org.apache.atlas.ApplicationProperties; |
| import org.apache.atlas.AtlasException; |
| import org.apache.commons.configuration.Configuration; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import javax.inject.Singleton; |
| import java.lang.reflect.Field; |
| import java.lang.reflect.Modifier; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Set; |
| |
| /** |
| * Default implementation for Graph Provider that doles out Titan Graph. |
| */ |
| public class TitanGraphProvider implements GraphProvider<TitanGraph> { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(TitanGraphProvider.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 TitanGraph graphInstance; |
| |
| public static Configuration getConfiguration() throws AtlasException { |
| Configuration configProperties = ApplicationProperties.get(); |
| return ApplicationProperties.getSubsetConfiguration(configProperties, GRAPH_PREFIX); |
| } |
| |
| static { |
| addSolr5Index(); |
| } |
| |
| /** |
| * Titan loads index backend name to implementation using StandardIndexProvider.ALL_MANAGER_CLASSES |
| * But StandardIndexProvider.ALL_MANAGER_CLASSES is a private static final ImmutableMap |
| * Only way to inject Solr5Index is to modify this field. So, using hacky reflection to add Sol5Index |
| */ |
| private static void addSolr5Index() { |
| try { |
| Field field = StandardIndexProvider.class.getDeclaredField("ALL_MANAGER_CLASSES"); |
| field.setAccessible(true); |
| |
| Field modifiersField = Field.class.getDeclaredField("modifiers"); |
| modifiersField.setAccessible(true); |
| modifiersField.setInt(field, field.getModifiers() & ~Modifier.FINAL); |
| |
| Map<String, String> customMap = new HashMap(StandardIndexProvider.getAllProviderClasses()); |
| customMap.put("solr5", Solr5Index.class.getName()); |
| ImmutableMap<String, String> immap = ImmutableMap.copyOf(customMap); |
| field.set(null, immap); |
| |
| LOG.debug("Injected solr5 index - {}", Solr5Index.class.getName()); |
| } catch(Exception e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| public static TitanGraph getGraphInstance() { |
| if (graphInstance == null) { |
| synchronized (TitanGraphProvider.class) { |
| if (graphInstance == null) { |
| Configuration config; |
| try { |
| config = getConfiguration(); |
| } catch (AtlasException e) { |
| throw new RuntimeException(e); |
| } |
| |
| graphInstance = TitanFactory.open(config); |
| validateIndexBackend(config); |
| } |
| } |
| } |
| return graphInstance; |
| } |
| |
| public static void clear() { |
| synchronized (TitanGraphProvider.class) { |
| graphInstance.shutdown(); |
| graphInstance = null; |
| } |
| } |
| |
| static void validateIndexBackend(Configuration config) { |
| String configuredIndexBackend = config.getString(INDEX_BACKEND_CONF); |
| |
| TitanManagement managementSystem = graphInstance.getManagementSystem(); |
| 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 |
| @Singleton |
| @Provides |
| public TitanGraph get() { |
| return getGraphInstance(); |
| } |
| } |