1 /* 2 * Copyright (c) 2011, 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 /* 25 * Portions Copyright (c) 2011 IBM Corporation 26 */ 27 28 /* 29 * @test 30 * @bug 7031076 31 * @summary Allow stale InputStreams from ZipFiles to be GC'd 32 * @author Neil Richards <neil.richards@ngmr.net>, <neil_richards@uk.ibm.com> 33 */ 34 import java.lang.ref.ReferenceQueue; 35 import java.lang.ref.WeakReference; 36 import java.io.File; 37 import java.io.FileOutputStream; 38 import java.io.InputStream; 39 import java.util.Enumeration; 40 import java.util.HashSet; 41 import java.util.Random; 42 import java.util.Set; 43 import java.util.zip.ZipEntry; 44 import java.util.zip.ZipFile; 45 import java.util.zip.ZipOutputStream; 46 47 public class ClearStaleZipFileInputStreams { 48 private static final int ZIP_ENTRY_NUM = 5; 49 50 private static final byte[][] data; 51 52 static { 53 data = new byte[ZIP_ENTRY_NUM][]; 54 Random r = new Random(); 55 for (int i = 0; i < ZIP_ENTRY_NUM; i++) { 56 data[i] = new byte[1000]; 57 r.nextBytes(data[i]); 58 } 59 } 60 61 private static File createTestFile(int compression) throws Exception { 62 File tempZipFile = 63 File.createTempFile("test-data" + compression, ".zip"); 64 tempZipFile.deleteOnExit(); 65 66 try (FileOutputStream fos = new FileOutputStream(tempZipFile); 67 ZipOutputStream zos = new ZipOutputStream(fos)) { 68 zos.setLevel(compression); 69 for (int i = 0; i < ZIP_ENTRY_NUM; i++) { 70 String text = "Entry" + i; 71 ZipEntry entry = new ZipEntry(text); 72 zos.putNextEntry(entry); 73 try { 74 zos.write(data[i], 0, data[i].length); 75 } finally { 76 zos.closeEntry(); 77 } 78 } 79 } 80 81 return tempZipFile; 82 } 83 84 private static final class GcInducingThread extends Thread { 85 private final int sleepMillis; 86 private boolean keepRunning = true; 87 88 public GcInducingThread(final int sleepMillis) { 89 this.sleepMillis = sleepMillis; 90 } 91 92 public synchronized void run() { 93 while (keepRunning) { 94 System.gc(); 95 try { 96 wait(sleepMillis); 97 } catch (InterruptedException e) { 98 System.out.println("GCing thread unexpectedly interrupted"); 99 return; 100 } 101 } 102 } 103 104 public synchronized void shutDown() { 105 keepRunning = false; 106 notifyAll(); 107 } 108 } 109 110 public static void main(String[] args) throws Exception { 111 GcInducingThread gcThread = new GcInducingThread(500); 112 gcThread.start(); 113 try { 114 runTest(ZipOutputStream.DEFLATED); 115 runTest(ZipOutputStream.STORED); 116 } finally { 117 gcThread.shutDown(); 118 gcThread.join(); 119 } 120 } 121 122 private static void runTest(int compression) throws Exception { 123 ReferenceQueue<InputStream> rq = new ReferenceQueue<>(); 124 125 System.out.println("Testing with a zip file with compression level = " 126 + compression); 127 File f = createTestFile(compression); 128 try (ZipFile zf = new ZipFile(f)) { 129 Set<Object> refSet = createTransientInputStreams(zf, rq); 130 131 System.out.println("Waiting for 'stale' input streams from ZipFile to be GC'd ..."); 132 System.out.println("(The test will hang on failure)"); 133 while (false == refSet.isEmpty()) { 134 refSet.remove(rq.remove()); 135 } 136 System.out.println("Test PASSED."); 137 System.out.println(); 138 } finally { 139 f.delete(); 140 } 141 } 142 143 private static Set<Object> createTransientInputStreams(ZipFile zf, 144 ReferenceQueue<InputStream> rq) throws Exception { 145 Enumeration<? extends ZipEntry> zfe = zf.entries(); 146 Set<Object> refSet = new HashSet<>(); 147 148 while (zfe.hasMoreElements()) { 149 InputStream is = zf.getInputStream(zfe.nextElement()); 150 refSet.add(new WeakReference<InputStream>(is, rq)); 151 } 152 153 return refSet; 154 } 155 }