org.apache.giraph.utils.TestTestGraph.java Source code

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Here is the source code for org.apache.giraph.utils.TestTestGraph.java

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/*
 * 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.utils;

import org.apache.giraph.conf.GiraphConfiguration;
import org.apache.giraph.conf.GiraphConstants;
import org.apache.giraph.edge.HashMapEdges;
import org.apache.giraph.graph.Vertex;
import org.apache.giraph.graph.VertexValueCombiner;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.NullWritable;
import org.junit.Assert;
import org.junit.Test;

import java.util.AbstractMap;
import java.util.Map;

/**
 * Test TestGraph
 */
public class TestTestGraph {
    @Test
    public void testTestGraph() {
        GiraphConfiguration conf = new GiraphConfiguration();
        GiraphConstants.VERTEX_ID_CLASS.set(conf, LongWritable.class);
        GiraphConstants.VERTEX_VALUE_CLASS.set(conf, LongWritable.class);
        GiraphConstants.EDGE_VALUE_CLASS.set(conf, NullWritable.class);
        conf.setVertexValueCombinerClass(SumLongVertexValueCombiner.class);
        conf.setOutEdgesClass(HashMapEdges.class);
        TestGraph<LongWritable, LongWritable, NullWritable> testGraph = new TestGraph<>(conf);
        addVertex(testGraph, 1, 10, 2, 3);
        addVertex(testGraph, 2, 20, 1, 3);
        addVertex(testGraph, 3, 30, 1, 2);
        addVertex(testGraph, 1, 100, 3, 4);
        addVertex(testGraph, 2, 200, 5, 1, 6);

        Vertex<LongWritable, LongWritable, NullWritable> vertex1 = testGraph.getVertex(new LongWritable(1));
        Assert.assertEquals(110, vertex1.getValue().get());
        Assert.assertEquals(3, vertex1.getNumEdges());

        Vertex<LongWritable, LongWritable, NullWritable> vertex2 = testGraph.getVertex(new LongWritable(2));
        Assert.assertEquals(220, vertex2.getValue().get());
        Assert.assertEquals(4, vertex2.getNumEdges());

        Vertex<LongWritable, LongWritable, NullWritable> vertex3 = testGraph.getVertex(new LongWritable(3));
        Assert.assertEquals(30, vertex3.getValue().get());
        Assert.assertEquals(2, vertex3.getNumEdges());
    }

    public static void addVertex(TestGraph<LongWritable, LongWritable, NullWritable> graph, long id, long value,
            long... neighbors) {
        Map.Entry<LongWritable, NullWritable> edges[] = new Map.Entry[neighbors.length];
        for (int i = 0; i < neighbors.length; i++) {
            edges[i] = new AbstractMap.SimpleEntry<>(new LongWritable(neighbors[i]), NullWritable.get());
        }
        graph.addVertex(new LongWritable(id), new LongWritable(value), edges);
    }

    /**
     * Vertex value combiner that sums up long vertex values
     */
    public static class SumLongVertexValueCombiner implements VertexValueCombiner<LongWritable> {
        @Override
        public void combine(LongWritable originalVertexValue, LongWritable vertexValue) {
            originalVertexValue.set(originalVertexValue.get() + vertexValue.get());
        }
    }
}