/**
* 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.mahout.clustering.spectral.common;
import java.net.URI;
import com.google.common.io.Closeables;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.filecache.DistributedCache;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.SequenceFile;
import org.apache.hadoop.io.Writable;
import org.apache.mahout.common.HadoopUtil;
import org.apache.mahout.common.MahoutTestCase;
import org.apache.mahout.common.iterator.sequencefile.SequenceFileValueIterator;
import org.apache.mahout.math.DenseVector;
import org.apache.mahout.math.Vector;
import org.apache.mahout.math.VectorWritable;
import org.junit.Test;
public class TestVectorCache extends MahoutTestCase {
private static final double [] VECTOR = { 1, 2, 3, 4 };
@Test
public void testSave() throws Exception {
Configuration conf = new Configuration();
Writable key = new IntWritable(0);
Vector value = new DenseVector(VECTOR);
Path path = getTestTempDirPath("output");
// write the vector out
VectorCache.save(key, value, path, conf, true, true);
// can we read it from here?
SequenceFileValueIterator<VectorWritable> iterator =
new SequenceFileValueIterator<VectorWritable>(path, true, conf);
try {
VectorWritable old = iterator.next();
// test if the values are identical
assertEquals("Saved vector is identical to original", old.get(), value);
} finally {
Closeables.close(iterator, true);
}
}
@Test
public void testLoad() throws Exception {
// save a vector manually
Configuration conf = new Configuration();
Writable key = new IntWritable(0);
Vector value = new DenseVector(VECTOR);
Path path = getTestTempDirPath("output");
FileSystem fs = FileSystem.get(path.toUri(), conf);
// write the vector
path = fs.makeQualified(path);
fs.deleteOnExit(path);
HadoopUtil.delete(conf, path);
SequenceFile.Writer writer = new SequenceFile.Writer(fs, conf, path, IntWritable.class, VectorWritable.class);
try {
writer.append(key, new VectorWritable(value));
} finally {
Closeables.close(writer, false);
}
DistributedCache.setCacheFiles(new URI[] {path.toUri()}, conf);
// load it
Vector result = VectorCache.load(conf);
// are they the same?
assertNotNull("Vector is null", result);
assertEquals("Loaded vector is not identical to original", result, value);
}
@Test
public void testAll() throws Exception {
Configuration conf = new Configuration();
Vector v = new DenseVector(VECTOR);
Path toSave = getTestTempDirPath("output");
Writable key = new IntWritable(0);
// save it
VectorCache.save(key, v, toSave, conf);
// now, load it back
Vector v2 = VectorCache.load(conf);
// are they the same?
assertNotNull("Vector is null", v2);
assertEquals("Vectors are not identical", v2, v);
}
}