/*
* 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.cf.taste.impl.model.file;
import java.io.File;
import org.apache.mahout.cf.taste.impl.TasteTestCase;
import org.apache.mahout.cf.taste.model.IDMigrator;
import org.junit.Before;
import org.junit.Test;
/**
* Tests {@link FileIDMigrator}
*/
public final class FileIDMigratorTest extends TasteTestCase {
private static final String[] STRING_IDS = {
"dog",
"cow" };
private static final String[] UPDATED_STRING_IDS = {
"dog",
"cow",
"donkey" };
private File testFile;
@Override
@Before
public void setUp() throws Exception {
super.setUp();
testFile = getTestTempFile("test.txt");
writeLines(testFile, STRING_IDS);
}
@Test
public void testLoadFromFile() throws Exception {
IDMigrator migrator = new FileIDMigrator(testFile);
long dogAsLong = migrator.toLongID("dog");
long cowAsLong = migrator.toLongID("cow");
long donkeyAsLong = migrator.toLongID("donkey");
assertEquals("dog", migrator.toStringID(dogAsLong));
assertEquals("cow", migrator.toStringID(cowAsLong));
assertNull(migrator.toStringID(donkeyAsLong));
}
@Test
public void testNoRefreshAfterFileUpdate() throws Exception {
IDMigrator migrator = new FileIDMigrator(testFile, 0L);
/* call a method to make sure the original file is loaded */
long dogAsLong = migrator.toLongID("dog");
migrator.toStringID(dogAsLong);
/* change the underlying file,
* we have to wait at least a second to see the change in the file's lastModified timestamp */
Thread.sleep(2000L);
writeLines(testFile, UPDATED_STRING_IDS);
/* we shouldn't see any changes in the data as we have not yet refreshed */
long cowAsLong = migrator.toLongID("cow");
long donkeyAsLong = migrator.toLongID("donkey");
assertEquals("dog", migrator.toStringID(dogAsLong));
assertEquals("cow", migrator.toStringID(cowAsLong));
assertNull(migrator.toStringID(donkeyAsLong));
}
@Test
public void testRefreshAfterFileUpdate() throws Exception {
IDMigrator migrator = new FileIDMigrator(testFile, 0L);
/* call a method to make sure the original file is loaded */
long dogAsLong = migrator.toLongID("dog");
migrator.toStringID(dogAsLong);
/* change the underlying file,
* we have to wait at least a second to see the change in the file's lastModified timestamp */
Thread.sleep(2000L);
writeLines(testFile, UPDATED_STRING_IDS);
migrator.refresh(null);
long cowAsLong = migrator.toLongID("cow");
long donkeyAsLong = migrator.toLongID("donkey");
assertEquals("dog", migrator.toStringID(dogAsLong));
assertEquals("cow", migrator.toStringID(cowAsLong));
assertEquals("donkey", migrator.toStringID(donkeyAsLong));
}
}