| /* |
| * 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.bsp.BspInputSplit; |
| import org.apache.giraph.graph.Vertex; |
| import org.apache.giraph.io.VertexInputFormat; |
| import org.apache.giraph.io.VertexReader; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.io.Writable; |
| import org.apache.hadoop.io.WritableComparable; |
| import org.apache.hadoop.mapreduce.InputSplit; |
| import org.apache.hadoop.mapreduce.JobContext; |
| import org.apache.hadoop.mapreduce.TaskAttemptContext; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| /** |
| * An input format that reads the input graph in memory. Used for unit tests. |
| * |
| * @param <I> The Input |
| * @param <V> The vertex type |
| * @param <E> The edge type |
| */ |
| public class InMemoryVertexInputFormat<I extends WritableComparable, |
| V extends Writable, E extends Writable> |
| extends VertexInputFormat<I, V, E> { |
| /** The graph */ |
| private static TestGraph GRAPH; |
| |
| public static void setGraph(TestGraph graph) { |
| InMemoryVertexInputFormat.GRAPH = graph; |
| } |
| |
| public static TestGraph getGraph() { |
| return GRAPH; |
| } |
| |
| @Override public void checkInputSpecs(Configuration conf) { } |
| |
| @Override |
| public List<InputSplit> getSplits(JobContext context, int minSplitCountHint) |
| throws IOException, InterruptedException { |
| // This is meaningless, the VertexReader will generate all the test |
| // data. |
| List<InputSplit> inputSplitList = new ArrayList<InputSplit>(); |
| for (int i = 0; i < minSplitCountHint; ++i) { |
| inputSplitList.add(new BspInputSplit(i, minSplitCountHint)); |
| } |
| return inputSplitList; |
| } |
| |
| @Override |
| public VertexReader<I, V, E> createVertexReader(InputSplit inputSplit, |
| TaskAttemptContext context) throws IOException { |
| return new InMemoryVertexReader(); |
| } |
| |
| /** |
| * Simple in memory reader |
| */ |
| private class InMemoryVertexReader extends VertexReader<I, V, E> { |
| /** The iterator */ |
| private Iterator<Vertex<I, V, E>> vertexIterator; |
| /** Current vertex */ |
| private Vertex<I, V, E> currentVertex; |
| |
| @Override |
| public void initialize(InputSplit inputSplit, |
| TaskAttemptContext context) { |
| vertexIterator = GRAPH.iterator(); |
| } |
| |
| @Override |
| public boolean nextVertex() { |
| if (vertexIterator.hasNext()) { |
| currentVertex = vertexIterator.next(); |
| return true; |
| } |
| return false; |
| } |
| |
| @Override |
| public Vertex<I, V, E> getCurrentVertex() { |
| return currentVertex; |
| } |
| |
| @Override |
| public void close() { |
| } |
| |
| @Override |
| public float getProgress() { |
| return 0; |
| } |
| } |
| } |