1/*2 * Licensed to the Apache Software Foundation (ASF) under one3 * or more contributor license agreements. See the NOTICE file4 * distributed with this work for additional information5 * regarding copyright ownership. The ASF licenses this file6 * to you under the Apache License, Version 2.0 (the7 * "License"); you may not use this file except in compliance8 * with the License. You may obtain a copy of the License at9 *10 * http://www.apache.org/licenses/LICENSE-2.011 *12 * Unless required by applicable law or agreed to in writing, software13 * 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 and16 * limitations under the License.17 */1819package org.apache.giraph.examples;
2021import org.apache.giraph.graph.BasicComputation;
22import org.apache.giraph.graph.Vertex;
23import org.apache.hadoop.io.FloatWritable;
24import org.apache.hadoop.io.IntWritable;
25import org.apache.hadoop.io.LongWritable;
26import org.apache.log4j.Logger;
2728import java.io.IOException;
2930/**31 * Test whether messages can be sent and received by vertices.32 */33publicclassSimpleMsgComputationextends34 BasicComputation<LongWritable, IntWritable, FloatWritable, IntWritable> {
35/** Class logger */36privatestatic Logger LOG = Logger.getLogger(SimpleMsgComputation.class);
37 @Override
38publicvoid compute(
39 Vertex<LongWritable, IntWritable, FloatWritable> vertex,
40 Iterable<IntWritable> messages) throws IOException {
41if (vertex.getId().equals(new LongWritable(2))) {
42 sendMessage(new LongWritable(1), new IntWritable(101));
43 sendMessage(new LongWritable(1), new IntWritable(102));
44 sendMessage(new LongWritable(1), new IntWritable(103));
45 }
46if (!vertex.getId().equals(new LongWritable(1))) {
47 vertex.voteToHalt();
48 } else {
49/* Check the messages */50int sum = 0;
51for (IntWritable message : messages) {
52 sum += message.get();
53 }
54 LOG.info("compute: Received a sum of " + sum +
55" (will stop on 306)");
5657if (sum == 306) {
58 vertex.voteToHalt();
59 }
60 }
61if (getSuperstep() > 3) {
62 System.err.println("compute: Vertex 1 failed to receive " +
63"messages in time");
64 vertex.voteToHalt();
65 }
66 }
67 }