| /* |
| * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.RandomAccessFile; |
| import java.lang.ref.Reference; |
| import java.lang.ref.WeakReference; |
| import java.nio.channels.FileLock; |
| import java.nio.channels.OverlappingFileLockException; |
| import java.nio.file.Files; |
| import java.nio.file.Path; |
| import jdk.test.lib.util.FileUtils; |
| |
| /* |
| * @test |
| * @bug 8166253 |
| * @summary Verify that OverlappingFileLockException is thrown when expected. |
| * @library .. /test/lib |
| * @build jdk.test.lib.util.FileUtils |
| * @run main/othervm FileLockGC |
| */ |
| public class FileLockGC { |
| public enum TestType { |
| NO_GC_NO_RELEASE(true), |
| // A hypothetical 'GC_THEN_RELEASE' case is infeasible |
| RELEASE(false), |
| RELEASE_THEN_GC(false), |
| GC(true); |
| |
| private final boolean exceptionExpected; |
| |
| TestType(boolean exceptionExpected) { |
| this.exceptionExpected = exceptionExpected; |
| } |
| |
| boolean exceptionExpected() { |
| return exceptionExpected; |
| } |
| } |
| |
| public static void main(String[] args) throws Exception { |
| final File f = new File(System.getProperty("test.dir", ".") |
| + File.separator + "junk.txt"); |
| final Path p = f.toPath(); |
| int failures = 0; |
| |
| for (TestType t : TestType.values()) { |
| try { |
| if (!testFileLockGC(f, t)) { |
| failures++; |
| } |
| } finally { |
| FileUtils.deleteFileIfExistsWithRetry(p); |
| } |
| } |
| |
| if (failures != 0) { |
| throw new RuntimeException("Test had " + failures + " failure(s)"); |
| } |
| } |
| |
| private static boolean testFileLockGC(File f, TestType type) |
| throws InterruptedException, IOException { |
| System.out.printf("Test %s starting%n", type.toString()); |
| |
| final RandomAccessFile raf1 = new RandomAccessFile(f, "rw"); |
| |
| FileLock lock1 = raf1.getChannel().tryLock(); |
| WeakReference<FileLock> ref1 = new WeakReference(lock1); |
| |
| switch (type) { |
| case GC: |
| lock1 = null; |
| System.gc(); |
| break; |
| case RELEASE: |
| lock1.release(); |
| break; |
| case RELEASE_THEN_GC: |
| lock1.release(); |
| lock1 = null; |
| System.gc(); |
| break; |
| default: // NO_GC_NO_RELEASE |
| // lock1 is neither collected nor released |
| break; |
| } |
| |
| final RandomAccessFile raf2 = new RandomAccessFile(f, "rw"); |
| |
| boolean success = true; |
| FileLock lock2 = null; |
| try { |
| lock2 = raf2.getChannel().tryLock(); |
| if (type.exceptionExpected()) { |
| System.err.printf |
| ("No expected OverlappingFileLockException for test %s%n", |
| type.toString()); |
| success = false; |
| } |
| } catch (OverlappingFileLockException ofe) { |
| if (!type.exceptionExpected()) { |
| System.err.printf |
| ("Unexpected OverlappingFileLockException for test %s%n", |
| type.toString()); |
| success = false; |
| } |
| } finally { |
| if (lock1 != null) { |
| lock1.release(); |
| } |
| if (lock2 != null) { |
| lock2.release(); |
| } |
| raf2.close(); |
| raf1.close(); |
| System.out.printf("Test %s finished%n", type.toString()); |
| } |
| |
| return success; |
| } |
| } |