| /** |
| * 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.yarn.server.nodemanager; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.util.List; |
| import java.util.ListIterator; |
| |
| import org.apache.hadoop.fs.FileUtil; |
| import org.junit.AfterClass; |
| import org.junit.Assert; |
| import org.junit.BeforeClass; |
| import org.junit.Test; |
| |
| public class TestDirectoryCollection { |
| |
| private static final File testDir = new File("target", |
| TestDirectoryCollection.class.getName()).getAbsoluteFile(); |
| private static final File testFile = new File(testDir, "testfile"); |
| |
| @BeforeClass |
| public static void setup() throws IOException { |
| testDir.mkdirs(); |
| testFile.createNewFile(); |
| } |
| |
| @AfterClass |
| public static void teardown() { |
| FileUtil.fullyDelete(testDir); |
| } |
| |
| @Test |
| public void testConcurrentAccess() throws IOException { |
| // Initialize DirectoryCollection with a file instead of a directory |
| String[] dirs = {testFile.getPath()}; |
| DirectoryCollection dc = new DirectoryCollection(dirs); |
| |
| // Create an iterator before checkDirs is called to reliable test case |
| List<String> list = dc.getGoodDirs(); |
| ListIterator<String> li = list.listIterator(); |
| |
| // DiskErrorException will invalidate iterator of non-concurrent |
| // collections. ConcurrentModificationException will be thrown upon next |
| // use of the iterator. |
| Assert.assertTrue("checkDirs did not remove test file from directory list", |
| dc.checkDirs()); |
| |
| // Verify no ConcurrentModification is thrown |
| li.next(); |
| } |
| } |