FinalizeZipFile.java revision 12745:f068a4ffddd2 
1/*
2 * Copyright (c) 2010, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24/* @test
25 * @bug 7007609 7009618
26 * @summary Check that ZipFile objects are always collected
27 * @key randomness
28 */
29
30import java.io.*;
31import java.util.Random;
32import java.util.zip.*;
33import java.util.concurrent.CountDownLatch;
34
35public class FinalizeZipFile {
36
37    private static final CountDownLatch finalizersDone = new CountDownLatch(3);
38
39    private static class InstrumentedZipFile extends ZipFile {
40
41        public InstrumentedZipFile(File f) throws Exception {
42            super(f);
43            System.out.printf("Using %s%n", f.getPath());
44        }
45        @Override
46        protected void finalize() throws IOException {
47            System.out.printf("Killing %s%n", getName());
48            super.finalize();
49            finalizersDone.countDown();
50        }
51    }
52
53    private static void makeGarbage() throws Throwable {
54        final Random rnd = new Random();
55        // Create some ZipFiles.
56        // Find some .jar files in test directory.
57        final File testdir = new File(System.getProperty("test.src", "."));
58        check(testdir.isDirectory());
59        final File[] jars = testdir.listFiles(
60            new FilenameFilter() {
61                public boolean accept(File dir, String name) {
62                    return name.endsWith(".jar");}});
63        check(jars.length > 1);
64
65        new InstrumentedZipFile(jars[rnd.nextInt(jars.length)]).close();
66        new InstrumentedZipFile(jars[rnd.nextInt(jars.length)]).close();
67
68        // Create a ZipFile and get an input stream from it
69        for (int i = 0; i < jars.length + 10; i++) {
70            ZipFile zf = new InstrumentedZipFile(jars[rnd.nextInt(jars.length)]);
71            ZipEntry ze = zf.getEntry("META-INF/MANIFEST.MF");
72            if (ze != null) {
73                InputStream is = zf.getInputStream(ze);
74                break;
75            }
76        }
77    }
78
79    public static void realMain(String[] args) throws Throwable {
80        makeGarbage();
81
82        System.gc();
83        finalizersDone.await();
84
85        // Not all ZipFiles were collected?
86        equal(finalizersDone.getCount(), 0L);
87    }
88
89    //--------------------- Infrastructure ---------------------------
90    static volatile int passed = 0, failed = 0;
91    static void pass() {passed++;}
92    static void fail() {failed++; Thread.dumpStack();}
93    static void fail(String msg) {System.out.println(msg); fail();}
94    static void unexpected(Throwable t) {failed++; t.printStackTrace();}
95    static void check(boolean cond) {if (cond) pass(); else fail();}
96    static void equal(Object x, Object y) {
97        if (x == null ? y == null : x.equals(y)) pass();
98        else fail(x + " not equal to " + y);}
99    public static void main(String[] args) throws Throwable {
100        try {realMain(args);} catch (Throwable t) {unexpected(t);}
101        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
102        if (failed > 0) throw new AssertionError("Some tests failed");}
103}
104