/*
* 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.JavaRDD;
import org.apache.spark.api.java.JavaSparkContext;
import org.apache.tinkerpop.gremlin.hadoop.Constants;
import org.apache.tinkerpop.gremlin.hadoop.structure.io.VertexWritable;
import org.apache.tinkerpop.gremlin.spark.structure.Spark;
import java.util.Optional;
/**
* @author Marko A. Rodriguez (http://markorodriguez.com)
*/
public final class PersistedInputRDD implements InputRDD {
@Override
public JavaPairRDD<Object, VertexWritable> readGraphRDD(final Configuration configuration, final JavaSparkContext sparkContext) {
if (!configuration.containsKey(Constants.GREMLIN_HADOOP_INPUT_LOCATION))
throw new IllegalArgumentException("There is no provided " + Constants.GREMLIN_HADOOP_INPUT_LOCATION + " to read the persisted RDD from");
Spark.create(sparkContext.sc());
final Optional<String> graphLocation = Constants.getSearchGraphLocation(configuration.getString(Constants.GREMLIN_HADOOP_INPUT_LOCATION), SparkContextStorage.open());
return graphLocation.isPresent() ? JavaPairRDD.fromJavaRDD((JavaRDD) Spark.getRDD(graphLocation.get()).toJavaRDD()) : JavaPairRDD.fromJavaRDD(sparkContext.emptyRDD());
}
@Override
public <K, V> JavaPairRDD<K, V> readMemoryRDD(final Configuration configuration, final String memoryKey, final JavaSparkContext sparkContext) {
if (!configuration.containsKey(Constants.GREMLIN_HADOOP_INPUT_LOCATION))
throw new IllegalArgumentException("There is no provided " + Constants.GREMLIN_HADOOP_INPUT_LOCATION + " to read the persisted RDD from");
return JavaPairRDD.fromJavaRDD((JavaRDD) Spark.getRDD(Constants.getMemoryLocation(configuration.getString(Constants.GREMLIN_HADOOP_INPUT_LOCATION), memoryKey)).toJavaRDD());
}
}