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https://issues.apache.org/jira/browse/FLINK-2561?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14947125#comment-14947125
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ASF GitHub Bot commented on FLINK-2561:
---------------------------------------
Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1211#discussion_r41411055
--- Diff:
flink-staging/flink-gelly-scala/src/main/scala/org/apache/flink/graph/scala/example/SingleSourceShortestPaths.scala
---
@@ -0,0 +1,170 @@
+/*
+ * 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.flink.graph.scala.example;
+
+import org.apache.flink.api.scala._
+import org.apache.flink.graph.scala._
+import org.apache.flink.types.NullValue
+import org.apache.flink.graph.Edge
+import org.apache.flink.api.common.functions.MapFunction
+import org.apache.flink.graph.spargel.VertexUpdateFunction
+import org.apache.flink.graph.spargel.MessageIterator
+import org.apache.flink.graph.Vertex
+import org.apache.flink.graph.spargel.MessagingFunction
+import scala.collection.JavaConversions._
+import org.apache.flink.graph.scala.utils.Tuple3ToEdgeMap
+import org.apache.flink.graph.example.utils.SingleSourceShortestPathsData
+
+/**
+ * This example shows how to use Gelly's vertex-centric iterations.
+ *
+ * It is an implementation of the Single-Source-Shortest-Paths algorithm.
+ *
+ * The input file is a plain text file and must be formatted as follows:
+ * Edges are represented by tuples of srcVertexId, trgVertexId, distance
which are
+ * separated by tabs. Edges themselves are separated by newlines.
+ * For example: <code>1\t2\t0.1\n1\t3\t1.4\n</code> defines two edges,
+ * edge 1-2 with distance 0.1, and edge 1-3 with distance 1.4.
+ *
+ * If no parameters are provided, the program is run with default data from
+ * [[org.apache.flink.graph.example.utils.SingleSourceShortestPathsData]]
+ */
+object SingleSourceShortestPaths {
+ def main(args: Array[String]) {
+ if (!parseParameters(args)) {
+ return
+ }
+
+ val env = ExecutionEnvironment.getExecutionEnvironment
+ val edges: DataSet[Edge[Long, Double]] = getEdgesDataSet(env)
+ val graph = Graph.fromDataSet[Long, Double, Double](edges, new
InitVertices(srcVertexId), env)
+
+ // Execute the vertex-centric iteration
+ val result = graph.runVertexCentricIteration(new VertexDistanceUpdater,
+ new MinDistanceMessenger, maxIterations)
+
+ // Extract the vertices as the result
+ val singleSourceShortestPaths = result.getVertices
+
+ // emit result
+ if (fileOutput) {
+ singleSourceShortestPaths.writeAsCsv(outputPath, "\n", ",")
+ env.execute("Single Source Shortest Paths Example")
+ } else {
--- End diff --
off by 1 space
> Sync Gelly Java and Scala APIs
> ------------------------------
>
> Key: FLINK-2561
> URL: https://issues.apache.org/jira/browse/FLINK-2561
> Project: Flink
> Issue Type: Task
> Components: Gelly
> Reporter: Vasia Kalavri
> Assignee: Vasia Kalavri
> Fix For: 0.10
>
>
> There is some functionality and tests missing from the Gelly Scala API. This
> should be added, together with documentation, a completeness test and some
> usage examples.
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