| /** |
| * 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.hadoop.hdfs.util; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.util.Random; |
| |
| import org.apache.hadoop.hdfs.MiniDFSCluster; |
| import org.apache.hadoop.io.IOUtils; |
| import org.junit.Before; |
| import org.junit.Test; |
| |
| import static org.junit.Assert.*; |
| |
| public class TestBestEffortLongFile { |
| |
| private static final File FILE = new File(MiniDFSCluster.getBaseDirectory() + |
| File.separatorChar + "TestBestEffortLongFile"); |
| |
| @Before |
| public void cleanup() { |
| if (FILE.exists()) { |
| assertTrue(FILE.delete()); |
| } |
| FILE.getParentFile().mkdirs(); |
| } |
| |
| @Test |
| public void testGetSet() throws IOException { |
| BestEffortLongFile f = new BestEffortLongFile(FILE, 12345L); |
| try { |
| // Before the file exists, should return default. |
| assertEquals(12345L, f.get()); |
| |
| // And first access should open it. |
| assertTrue(FILE.exists()); |
| |
| Random r = new Random(); |
| for (int i = 0; i < 100; i++) { |
| long newVal = r.nextLong(); |
| // Changing the value should be reflected in the next get() call. |
| f.set(newVal); |
| assertEquals(newVal, f.get()); |
| |
| // And should be reflected in a new instance (ie it actually got |
| // written to the file) |
| BestEffortLongFile f2 = new BestEffortLongFile(FILE, 999L); |
| try { |
| assertEquals(newVal, f2.get()); |
| } finally { |
| IOUtils.closeStream(f2); |
| } |
| } |
| } finally { |
| IOUtils.closeStream(f); |
| } |
| } |
| |
| @Test |
| public void testTruncatedFileReturnsDefault() throws IOException { |
| assertTrue(FILE.createNewFile()); |
| assertEquals(0, FILE.length()); |
| BestEffortLongFile f = new BestEffortLongFile(FILE, 12345L); |
| try { |
| assertEquals(12345L, f.get()); |
| } finally { |
| f.close(); |
| } |
| } |
| } |