1 /*

     2  * Copyright (c) 2010, 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  */

    28 

    29 import java.io.*;

    30 import java.nio.*;

    31 import java.util.Random;

    32 import java.util.zip.*;

    33 import java.util.concurrent.CountDownLatch;

    34 import java.util.concurrent.TimeUnit;

    35 

    36 public class FinalizeZipFile {

    37 

    38     private final static CountDownLatch finalizersDone = new CountDownLatch(3);

    39 

    40     private static class InstrumentedZipFile extends ZipFile {

    41 

    42         public InstrumentedZipFile(File f) throws Exception {

    43             super(f);

    44             System.out.printf("Using %s%n", f.getPath());

    45         }

    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         final String javaHome = System.getProperty("java.home");

    56         // Create some ZipFiles.

    57         // Find some .jar files in JDK's lib directory.

    58         final File lib = new File(javaHome, "lib");

    59         check(lib.isDirectory());

    60         final File[] jars = lib.listFiles(

    61             new FilenameFilter() {

    62                 public boolean accept(File dir, String name) {

    63                     return name.endsWith(".jar");}});

    64         check(jars.length > 1);

    65 

    66         new InstrumentedZipFile(jars[rnd.nextInt(jars.length)]).close();

    67         new InstrumentedZipFile(jars[rnd.nextInt(jars.length)]).close();

    68 

    69         // Create a ZipFile and get an input stream from it

    70         ZipFile zf = new InstrumentedZipFile(jars[rnd.nextInt(jars.length)]);

    71         ZipEntry ze = zf.getEntry("META-INF/MANIFEST.MF");

    72         InputStream is = zf.getInputStream(ze);

    73     }

    74 

    75     public static void realMain(String[] args) throws Throwable {

    76         makeGarbage();

    77 

    78         System.gc();

    79         finalizersDone.await(5, TimeUnit.SECONDS);

    80 

    81         // Not all ZipFiles were collected?

    82         equal(finalizersDone.getCount(), 0L);

    83     }

    84 

    85     //--------------------- Infrastructure ---------------------------

    86     static volatile int passed = 0, failed = 0;

    87     static void pass() {passed++;}

    88     static void fail() {failed++; Thread.dumpStack();}

    89     static void fail(String msg) {System.out.println(msg); fail();}

    90     static void unexpected(Throwable t) {failed++; t.printStackTrace();}

    91     static void check(boolean cond) {if (cond) pass(); else fail();}

    92     static void equal(Object x, Object y) {

    93         if (x == null ? y == null : x.equals(y)) pass();

    94         else fail(x + " not equal to " + y);}

    95     public static void main(String[] args) throws Throwable {

    96         try {realMain(args);} catch (Throwable t) {unexpected(t);}

    97         System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);

    98         if (failed > 0) throw new AssertionError("Some tests failed");}

    99 }

   100