/**
* 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.hama.graph;
import java.util.ArrayList;
import java.util.List;
import junit.framework.TestCase;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.DoubleWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hama.bsp.TaskAttemptID;
import org.apache.hama.graph.example.PageRank;
import org.apache.hama.graph.example.PageRank.PageRankVertex;
import org.junit.Test;
public class TestDiskVerticesInfo extends TestCase {
@Test
public void testDiskVerticesInfoLifeCycle() throws Exception {
DiskVerticesInfo<Text, NullWritable, DoubleWritable> info = new DiskVerticesInfo<Text, NullWritable, DoubleWritable>();
Configuration conf = new Configuration();
conf.set(GraphJob.VERTEX_CLASS_ATTR, PageRankVertex.class.getName());
conf.set(GraphJob.VERTEX_EDGE_VALUE_CLASS_ATTR,
NullWritable.class.getName());
conf.set(GraphJob.VERTEX_ID_CLASS_ATTR, Text.class.getName());
conf.set(GraphJob.VERTEX_VALUE_CLASS_ATTR, DoubleWritable.class.getName());
GraphJobRunner.<Text, NullWritable, DoubleWritable> initClasses(conf);
TaskAttemptID attempt = new TaskAttemptID("omg", 1, 1, 0);
try {
ArrayList<PageRankVertex> list = new ArrayList<PageRankVertex>();
for (int i = 0; i < 10; i++) {
PageRankVertex v = new PageRank.PageRankVertex();
v.setVertexID(new Text(i + ""));
if (i % 2 == 0) {
v.setValue(new DoubleWritable(i * 2));
}
v.addEdge(new Edge<Text, NullWritable>(new Text((10 - i) + ""), null));
list.add(v);
}
info.init(null, conf, attempt);
for (PageRankVertex v : list) {
info.addVertex(v);
}
info.finishAdditions();
// implicitly finish the superstep here as the new softfile must be
// generated, the currentStep must be incremented etc.
info.finishSuperstep();
assertEquals(10, info.size());
// no we want to iterate and check if the result can properly be obtained
info.startSuperstep();
int index = 0;
IDSkippingIterator<Text, NullWritable, DoubleWritable> iterator = info
.skippingIterator();
while (iterator.hasNext()) {
Vertex<Text, NullWritable, DoubleWritable> next = iterator.next();
PageRankVertex pageRankVertex = list.get(index);
assertEquals(pageRankVertex.getVertexID().toString(), next
.getVertexID().toString());
if (index % 2 == 0) {
assertEquals((int) next.getValue().get(), index * 2);
} else {
assertNull(next.getValue());
}
assertEquals(next.isHalted(), false);
// check edges
List<Edge<Text, NullWritable>> edges = next.getEdges();
assertEquals(1, edges.size());
Edge<Text, NullWritable> edge = edges.get(0);
assertEquals(pageRankVertex.getEdges().get(0).getDestinationVertexID()
.toString(), edge.getDestinationVertexID().toString());
assertNull(edge.getValue());
info.finishVertexComputation(next);
index++;
}
assertEquals(index, list.size());
info.finishSuperstep();
// iterate again and compute so vertices change internally
info.startSuperstep();
iterator = info.skippingIterator();
while (iterator.hasNext()) {
Vertex<Text, NullWritable, DoubleWritable> next = iterator.next();
// override everything with constant 2
next.setValue(new DoubleWritable(2));
if (Integer.parseInt(next.getVertexID().toString()) == 3) {
next.voteToHalt();
}
info.finishVertexComputation(next);
}
info.finishSuperstep();
index = 0;
// now reread
info.startSuperstep();
iterator = info.skippingIterator();
while (iterator.hasNext()) {
Vertex<Text, NullWritable, DoubleWritable> next = iterator.next();
PageRankVertex pageRankVertex = list.get(index);
assertEquals(pageRankVertex.getVertexID().toString(), next
.getVertexID().toString());
assertEquals((int) next.getValue().get(), 2);
// check edges
List<Edge<Text, NullWritable>> edges = next.getEdges();
assertEquals(1, edges.size());
Edge<Text, NullWritable> edge = edges.get(0);
assertEquals(pageRankVertex.getEdges().get(0).getDestinationVertexID()
.toString(), edge.getDestinationVertexID().toString());
assertNull(edge.getValue());
if (index == 3) {
assertEquals(true, next.isHalted());
}
index++;
}
assertEquals(index, list.size());
} finally {
info.cleanup(conf, attempt);
}
}
}