1 /*

     2  * Copyright 2019 Amazon.com, Inc. 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 

    25 /*

    26  * @test

    27  * @bug 8234011

    28  * @summary Check that jdk.nio.zipfs.ZipFileSystem doesn't cache more than ZipFileSystem.MAX_FLATER Inflater/Deflater objects

    29  * @run main ReleaseDeflater

    30  * @modules jdk.zipfs/jdk.nio.zipfs:+open

    31  * @author Volker Simonis

    32  */

    33 

    34 import java.io.InputStream;

    35 import java.io.OutputStream;

    36 import java.lang.reflect.Field;

    37 import java.nio.file.FileSystem;

    38 import java.nio.file.FileSystems;

    39 import java.nio.file.Files;

    40 import java.nio.file.Path;

    41 import java.nio.file.Paths;

    42 import java.nio.file.spi.FileSystemProvider;

    43 import java.util.List;

    44 import java.util.Map;

    45 import java.util.ArrayList;

    46 

    47 public class ReleaseDeflater {

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

    49         Path zipFile = Paths.get("ReleaseDeflaterTest.zip");

    50         try (FileSystem fs = FileSystems.newFileSystem(zipFile, Map.of("create", true))) {

    51             FileSystemProvider zprov = fs.provider();

    52             Path test = fs.getPath("test.txt");

    53             int STREAMS = 100;

    54             List<OutputStream> ostreams = new ArrayList<>(STREAMS);

    55             List<InputStream> istreams = new ArrayList<>(STREAMS);

    56             for (int i = 0; i < STREAMS; i++) {

    57                 OutputStream zos = zprov.newOutputStream(test);

    58                 ostreams.add(zos);

    59                 zos.write("Hello".getBytes());

    60             }

    61             for (OutputStream os : ostreams) {

    62                 os.close();

    63             }

    64             for (int i = 0; i < STREAMS; i++) {

    65                 InputStream zis = zprov.newInputStream(test);

    66                 istreams.add(zis);

    67             }

    68             for (InputStream is : istreams) {

    69                 is.close();

    70             }

    71             try {

    72                 Field max_flaters = fs.getClass().getDeclaredField("MAX_FLATER");

    73                 max_flaters.setAccessible(true);

    74                 int MAX_FLATERS = max_flaters.getInt(fs);

    75                 Field inflaters = fs.getClass().getDeclaredField("inflaters");

    76                 inflaters.setAccessible(true);

    77                 int inflater_count = ((List<?>) inflaters.get(fs)).size();

    78                 if (inflater_count > MAX_FLATERS) {

    79                     throw new Exception("Too many inflaters " + inflater_count);

    80                 }

    81                 Field deflaters = fs.getClass().getDeclaredField("deflaters");

    82                 deflaters.setAccessible(true);

    83                 int deflater_count = ((List<?>) deflaters.get(fs)).size();

    84                 if (deflater_count > MAX_FLATERS) {

    85                     throw new Exception("Too many deflaters " + deflater_count);

    86                 }

    87             } catch (NoSuchFieldException nsfe) {

    88                 // Probably the implementation has changed, so there's not much we can do...

    89                 throw new RuntimeException("Implementation of jdk.nio.zipfs.ZipFileSystem changed - disable or fix the test");

    90             }

    91         } finally {

    92             Files.deleteIfExists(zipFile);

    93         }

    94 

    95     }

    96 }