Github user JoshRosen commented on a diff in the pull request: https://github.com/apache/spark/pull/4205#discussion_r23556050 --- Diff: graphx/src/main/scala/org/apache/spark/graphx/api/java/JavaEdgeRDD.scala --- @@ -0,0 +1,138 @@ +/* + * 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.spark.graphx.api.java + +import java.lang.{Long => JLong} +import java.util.{List => JList} + +import org.apache.spark.api.java.JavaRDD +import org.apache.spark.api.java.function.{Function => JFunction} +import org.apache.spark.graphx._ +import org.apache.spark.rdd.RDD +import org.apache.spark.storage.StorageLevel + +import scala.language.implicitConversions +import scala.reflect.ClassTag + +/** + * EdgeRDD['ED'] is a column-oriented edge partition RDD created from RDD[Edge[ED]]. + * JavaEdgeRDD class provides a Java API to access implementations of the EdgeRDD class + * + * @param targetStorageLevel + * @tparam ED + */ +class JavaEdgeRDD[ED]( + val edges: RDD[Edge[ED]], + val targetStorageLevel: StorageLevel = StorageLevel.MEMORY_ONLY) + (implicit val classTag: ClassTag[ED]) + extends JavaEdgeRDDLike[ED, JavaEdgeRDD[ED], JavaRDD[(VertexId, VertexId, ED)]] { + +// /** +// * To create JavaEdgeRDD from JavaRDDs of tuples +// * (source vertex id, destination vertex id and edge property class). +// * The edge property class can be Array[Byte] +// * @param jEdges +// */ +// def this(jEdges: JavaRDD[(VertexId, VertexId, ED)]) = { +// this(jEdges.rdd.map(x => Edge[ED](x._1, x._2, x._3))) +// } + + /* Convert RDD[(PartitionID, EdgePartition[ED, VD])] to EdgeRDD[ED, VD] */ + override def edgeRDD = EdgeRDD.fromEdges(edges) + + /** + * Java Wrapper for RDD of Edges + * + * @param edgeRDD + * @return + */ + def wrapRDD(edgeRDD: RDD[Edge[ED]]): JavaRDD[Edge[ED]] = { + JavaRDD.fromRDD(edgeRDD) + } + + /** Persist RDDs of this JavaEdgeRDD with the default storage level (MEMORY_ONLY_SER) */ + def cache(): this.type = { + edges.cache() + this + } + + def collect(): JList[Edge[ED]] = { + import scala.collection.JavaConversions._ + val arr: java.util.Collection[Edge[ED]] = edges.collect().toSeq + new java.util.ArrayList(arr) + } + + /** + * Return a new single long element generated by counting all elements in the vertex RDD + */ + override def count(): JLong = edges.count() + + /** Return a new VertexRDD containing only the elements that satisfy a predicate. */ + def filter(f: JFunction[Edge[ED], Boolean]): JavaEdgeRDD[ED] = + JavaEdgeRDD(edgeRDD.filter(x => f.call(x).booleanValue())) + + def id: JLong = edges.id.toLong + + /** Persist RDDs of this JavaEdgeRDD with the default storage level (MEMORY_ONLY_SER) */ + def persist(): this.type = { + edges.persist() + this + } + + /** Persist the RDDs of this EdgeRDD with the given storage level */ + def persist(storageLevel: StorageLevel): this.type = { + edges.persist(storageLevel) + this + } + + def unpersist(blocking: Boolean = true) : this.type = { + edgeRDD.unpersist(blocking) + this + } + + override def mapValues[ED2: ClassTag](f: Edge[ED] => ED2): JavaEdgeRDD[ED2] = { + JavaEdgeRDD(edgeRDD.mapValues(f)) + } + + override def reverse: JavaEdgeRDD[ED] = JavaEdgeRDD(edgeRDD.reverse) + + def innerJoin[ED2: ClassTag, ED3: ClassTag] + (other: EdgeRDD[ED2]) + (f: (VertexId, VertexId, ED, ED2) => ED3): JavaEdgeRDD[ED3] = { + JavaEdgeRDD(edgeRDD.innerJoin(other)(f)) + } + + def toRDD : RDD[Edge[ED]] = edges +} + +object JavaEdgeRDD { + + implicit def apply[ED: ClassTag](edges: JavaRDD[Edge[ED]]) : JavaEdgeRDD[ED] = { + JavaEdgeRDD(EdgeRDD.fromEdges(edges.rdd)) + } + + def toEdgeRDD[ED: ClassTag](edges: JavaEdgeRDD[ED]): RDD[Edge[ED]] = { + JavaEdgeRDD(edges.edgeRDD).toRDD + } + +// def apply[ED: ClassTag]( --- End diff -- Mind removing all of the commented-out code?
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