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/*
* Copyright (c) 2011, 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.
*/
/*
* Portions Copyright (c) 2011 IBM Corporation
*/
/*
* @test
* @bug 7031076
* @summary Allow stale InputStreams from ZipFiles to be GC'd
* @author Neil Richards <neil.richards@ngmr.net>, <neil_richards@uk.ibm.com>
* @key randomness
*/
import java.lang.ref.ReferenceQueue;
import java.lang.ref.WeakReference;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Random;
import java.util.Set;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;
public class ClearStaleZipFileInputStreams {
private static final int ZIP_ENTRY_NUM = 5;
private static final byte[][] data;
static {
data = new byte[ZIP_ENTRY_NUM][];
Random r = new Random();
for (int i = 0; i < ZIP_ENTRY_NUM; i++) {
data[i] = new byte[1000];
r.nextBytes(data[i]);
}
}
private static File createTestFile(int compression) throws Exception {
File tempZipFile =
File.createTempFile("test-data" + compression, ".zip");
tempZipFile.deleteOnExit();
try (FileOutputStream fos = new FileOutputStream(tempZipFile);
ZipOutputStream zos = new ZipOutputStream(fos)) {
zos.setLevel(compression);
for (int i = 0; i < ZIP_ENTRY_NUM; i++) {
String text = "Entry" + i;
ZipEntry entry = new ZipEntry(text);
zos.putNextEntry(entry);
try {
zos.write(data[i], 0, data[i].length);
} finally {
zos.closeEntry();
}
}
}
return tempZipFile;
}
private static final class GcInducingThread extends Thread {
private final int sleepMillis;
private boolean keepRunning = true;
public GcInducingThread(final int sleepMillis) {
this.sleepMillis = sleepMillis;
}
public synchronized void run() {
while (keepRunning) {
System.gc();
try {
wait(sleepMillis);
} catch (InterruptedException e) {
System.out.println("GCing thread unexpectedly interrupted");
return;
}
}
}
public synchronized void shutDown() {
keepRunning = false;
notifyAll();
}
}
public static void main(String[] args) throws Exception {
GcInducingThread gcThread = new GcInducingThread(500);
gcThread.start();
try {
runTest(ZipOutputStream.DEFLATED);
runTest(ZipOutputStream.STORED);
} finally {
gcThread.shutDown();
gcThread.join();
}
}
private static void runTest(int compression) throws Exception {
ReferenceQueue<InputStream> rq = new ReferenceQueue<>();
System.out.println("Testing with a zip file with compression level = "
+ compression);
File f = createTestFile(compression);
try (ZipFile zf = new ZipFile(f)) {
Set<Object> refSet = createTransientInputStreams(zf, rq);
System.out.println("Waiting for 'stale' input streams from ZipFile to be GC'd ...");
System.out.println("(The test will hang on failure)");
while (false == refSet.isEmpty()) {
refSet.remove(rq.remove());
}
System.out.println("Test PASSED.");
System.out.println();
} finally {
f.delete();
}
}
private static Set<Object> createTransientInputStreams(ZipFile zf,
ReferenceQueue<InputStream> rq) throws Exception {
Enumeration<? extends ZipEntry> zfe = zf.entries();
Set<Object> refSet = new HashSet<>();
while (zfe.hasMoreElements()) {
InputStream is = zf.getInputStream(zfe.nextElement());
refSet.add(new WeakReference<InputStream>(is, rq));
}
return refSet;
}
}
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