| /* |
| * 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.giraph.examples; |
| |
| import org.apache.giraph.combiner.MinimumIntCombiner; |
| import org.apache.giraph.conf.GiraphConfiguration; |
| import org.apache.giraph.edge.ByteArrayEdges; |
| import org.apache.giraph.io.formats.IdWithValueTextOutputFormat; |
| import org.apache.giraph.io.formats.IntIntNullTextInputFormat; |
| import org.apache.giraph.utils.InternalVertexRunner; |
| import org.junit.Test; |
| |
| import com.google.common.base.Splitter; |
| import com.google.common.collect.HashMultimap; |
| import com.google.common.collect.Iterables; |
| import com.google.common.collect.SetMultimap; |
| |
| import java.util.Set; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertTrue; |
| |
| /** |
| * Tests for {@link ConnectedComponentsVertex} |
| */ |
| public class ConnectedComponentsVertexTest { |
| |
| /** |
| * A local integration test on toy data |
| */ |
| @Test |
| public void testToyData() throws Exception { |
| |
| // a small graph with three components |
| String[] graph = new String[] { |
| "1 2 3", |
| "2 1 4 5", |
| "3 1 4", |
| "4 2 3 5 13", |
| "5 2 4 12 13", |
| "12 5 13", |
| "13 4 5 12", |
| |
| "6 7 8", |
| "7 6 10 11", |
| "8 6 10", |
| "10 7 8 11", |
| "11 7 10", |
| |
| "9" }; |
| |
| GiraphConfiguration conf = new GiraphConfiguration(); |
| conf.setVertexClass(ConnectedComponentsVertex.class); |
| conf.setOutEdgesClass(ByteArrayEdges.class); |
| conf.setCombinerClass(MinimumIntCombiner.class); |
| conf.setVertexInputFormatClass(IntIntNullTextInputFormat.class); |
| conf.setVertexOutputFormatClass(IdWithValueTextOutputFormat.class); |
| |
| // run internally |
| Iterable<String> results = InternalVertexRunner.run(conf, graph); |
| |
| SetMultimap<Integer,Integer> components = parseResults(results); |
| |
| Set<Integer> componentIDs = components.keySet(); |
| assertEquals(3, componentIDs.size()); |
| assertTrue(componentIDs.contains(1)); |
| assertTrue(componentIDs.contains(6)); |
| assertTrue(componentIDs.contains(9)); |
| |
| Set<Integer> componentOne = components.get(1); |
| assertEquals(7, componentOne.size()); |
| assertTrue(componentOne.contains(1)); |
| assertTrue(componentOne.contains(2)); |
| assertTrue(componentOne.contains(3)); |
| assertTrue(componentOne.contains(4)); |
| assertTrue(componentOne.contains(5)); |
| assertTrue(componentOne.contains(12)); |
| assertTrue(componentOne.contains(13)); |
| |
| Set<Integer> componentTwo = components.get(6); |
| assertEquals(5, componentTwo.size()); |
| assertTrue(componentTwo.contains(6)); |
| assertTrue(componentTwo.contains(7)); |
| assertTrue(componentTwo.contains(8)); |
| assertTrue(componentTwo.contains(10)); |
| assertTrue(componentTwo.contains(11)); |
| |
| Set<Integer> componentThree = components.get(9); |
| assertEquals(1, componentThree.size()); |
| assertTrue(componentThree.contains(9)); |
| } |
| |
| private SetMultimap<Integer,Integer> parseResults( |
| Iterable<String> results) { |
| SetMultimap<Integer,Integer> components = HashMultimap.create(); |
| for (String result : results) { |
| Iterable<String> parts = Splitter.on('\t').split(result); |
| int vertex = Integer.parseInt(Iterables.get(parts, 0)); |
| int component = Integer.parseInt(Iterables.get(parts, 1)); |
| components.put(component, vertex); |
| } |
| return components; |
| } |
| } |