1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 package org.apache.giraph.io.superstep_output; 20 21 import org.apache.giraph.graph.Vertex; 22 import org.apache.giraph.io.SimpleVertexWriter; 23 import org.apache.hadoop.io.Writable; 24 import org.apache.hadoop.io.WritableComparable; 25 26 import java.io.IOException; 27 28 /** 29 * Class to use as {@link SuperstepOutput} when we don't have output during 30 * computation. All the methods are no-ops. 31 * 32 * @param <I> Vertex id 33 * @param <V> Vertex value 34 * @param <E> Edge value 35 */ 36 public class NoOpSuperstepOutput<I extends WritableComparable, 37 V extends Writable, E extends Writable> implements 38 SuperstepOutput<I, V, E> { 39 @Override 40 public SimpleVertexWriter<I, V, E> getVertexWriter() { 41 return new SimpleVertexWriter<I, V, E>() { 42 @Override 43 public void writeVertex(Vertex<I, V, E> vertex) throws IOException, 44 InterruptedException { 45 } 46 }; 47 } 48 49 @Override 50 public void returnVertexWriter( 51 SimpleVertexWriter<I, V, E> vertexWriter) { 52 } 53 54 @Override 55 public void postApplication() { 56 } 57 }