| /* |
| * 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.tinkerpop.gremlin.spark.structure.io; |
| |
| import org.apache.commons.configuration.Configuration; |
| import org.apache.spark.api.java.JavaPairRDD; |
| import org.apache.spark.api.java.JavaSparkContext; |
| import org.apache.tinkerpop.gremlin.hadoop.Constants; |
| import org.apache.tinkerpop.gremlin.hadoop.structure.io.HadoopPools; |
| import org.apache.tinkerpop.gremlin.hadoop.structure.io.VertexWritable; |
| import org.apache.tinkerpop.gremlin.structure.Graph; |
| import org.apache.tinkerpop.gremlin.structure.io.GraphReader; |
| import org.apache.tinkerpop.gremlin.structure.io.gryo.GryoIo; |
| import org.apache.tinkerpop.gremlin.structure.io.gryo.GryoReader; |
| import org.apache.tinkerpop.gremlin.structure.io.gryo.GryoResourceAccess; |
| import org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerFactory; |
| import org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerGraph; |
| import org.apache.tinkerpop.gremlin.util.iterator.IteratorUtils; |
| import scala.Tuple2; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.List; |
| |
| /** |
| * @author Marko A. Rodriguez (http://markorodriguez.com) |
| */ |
| public final class ToyGraphInputRDD implements InputRDD { |
| |
| @Override |
| public JavaPairRDD<Object, VertexWritable> readGraphRDD(final Configuration configuration, final JavaSparkContext sparkContext) { |
| HadoopPools.initialize(TinkerGraph.open().configuration()); |
| final List<VertexWritable> vertices; |
| if (configuration.getString(Constants.GREMLIN_HADOOP_INPUT_LOCATION).contains("modern")) |
| vertices = IteratorUtils.list(IteratorUtils.map(TinkerFactory.createModern().vertices(), VertexWritable::new)); |
| else if (configuration.getString(Constants.GREMLIN_HADOOP_INPUT_LOCATION).contains("classic")) |
| vertices = IteratorUtils.list(IteratorUtils.map(TinkerFactory.createClassic().vertices(), VertexWritable::new)); |
| else if (configuration.getString(Constants.GREMLIN_HADOOP_INPUT_LOCATION).contains("crew")) |
| vertices = IteratorUtils.list(IteratorUtils.map(TinkerFactory.createTheCrew().vertices(), VertexWritable::new)); |
| else if (configuration.getString(Constants.GREMLIN_HADOOP_INPUT_LOCATION).contains("grateful")) { |
| try { |
| final Graph graph = TinkerGraph.open(); |
| final GraphReader reader = GryoReader.build().mapper(graph.io(GryoIo.build()).mapper().create()).create(); |
| try (final InputStream stream = GryoResourceAccess.class.getResourceAsStream("grateful-dead.kryo")) { |
| reader.readGraph(stream, graph); |
| } |
| vertices = IteratorUtils.list(IteratorUtils.map(graph.vertices(), VertexWritable::new)); |
| } catch (final IOException e) { |
| throw new IllegalStateException(e.getMessage(), e); |
| } |
| } else |
| throw new IllegalArgumentException("No legal toy graph was provided to load: " + configuration.getProperty(Constants.GREMLIN_HADOOP_INPUT_LOCATION)); |
| |
| return sparkContext.parallelize(vertices).mapToPair(vertex -> new Tuple2<>(vertex.get().id(), vertex)); |
| } |
| } |