| /* |
| * 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.tinkerpop.gremlin.hadoop.Constants; |
| import org.apache.tinkerpop.gremlin.hadoop.structure.io.VertexWritable; |
| import org.apache.tinkerpop.gremlin.process.computer.KeyValue; |
| import org.apache.tinkerpop.gremlin.process.computer.Memory; |
| |
| import java.util.Collections; |
| import java.util.Iterator; |
| |
| /** |
| * @author Marko A. Rodriguez (http://markorodriguez.com) |
| */ |
| public interface OutputRDD { |
| |
| /** |
| * Write the graphRDD to an output location. The {@link Configuration} maintains the specified location via {@link Constants#GREMLIN_HADOOP_OUTPUT_LOCATION}. |
| * |
| * @param configuration the configuration of the Spark job |
| * @param graphRDD the graphRDD to output |
| */ |
| public void writeGraphRDD(final Configuration configuration, final JavaPairRDD<Object, VertexWritable> graphRDD); |
| |
| /** |
| * Write the sideEffect memoryRDD to an output location. The {@link Configuration} maintains the specified location via {@link Constants#GREMLIN_HADOOP_OUTPUT_LOCATION}. |
| * The default implementation returns an empty iterator. |
| * |
| * @param configuration the configuration of the Spark job |
| * @param memoryKey the memory key of the memoryRDD |
| * @param memoryRDD the memoryRDD |
| * @param <K> the key class of the RDD |
| * @param <V> the value class of the RDD |
| * @return the {@link KeyValue} iterator to store in the final resultant {@link Memory}. |
| */ |
| public default <K, V> Iterator<KeyValue<K, V>> writeMemoryRDD(final Configuration configuration, final String memoryKey, final JavaPairRDD<K, V> memoryRDD) { |
| return Collections.emptyIterator(); |
| } |
| } |