108 lines
3.5 KiB
Java
108 lines
3.5 KiB
Java
/*
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* Copyright (c) 2013, 2016, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* To use ClassUnloadCommon from a sub-process, see hotspot/test/runtime/logging/ClassLoadUnloadTest.java
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* for an example.
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*/
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import java.io.File;
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import java.net.MalformedURLException;
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import java.net.URL;
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import java.net.URLClassLoader;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.util.ArrayList;
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import java.util.stream.Stream;
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public class ClassUnloadCommon {
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public static class TestFailure extends RuntimeException {
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TestFailure(String msg) {
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super(msg);
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}
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}
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public static void failIf(boolean value, String msg) {
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if (value) throw new TestFailure("Test failed: " + msg);
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}
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private static volatile Object dummy = null;
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private static void allocateMemory(int kilobytes) {
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ArrayList<byte[]> l = new ArrayList<>();
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dummy = l;
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for (int i = kilobytes; i > 0; i -= 1) {
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l.add(new byte[1024]);
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}
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l = null;
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dummy = null;
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}
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public static void triggerUnloading() {
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allocateMemory(16 * 1024); // yg size is 8m with cms, force young collection
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System.gc();
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}
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/**
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* Creates a class loader that loads classes from {@code ${test.class.path}}
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* before delegating to the system class loader.
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*/
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public static ClassLoader newClassLoader() {
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String cp = System.getProperty("test.class.path", ".");
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URL[] urls = Stream.of(cp.split(File.pathSeparator))
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.map(Paths::get)
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.map(ClassUnloadCommon::toURL)
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.toArray(URL[]::new);
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return new URLClassLoader(urls) {
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@Override
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public Class<?> loadClass(String cn, boolean resolve)
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throws ClassNotFoundException
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{
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synchronized (getClassLoadingLock(cn)) {
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Class<?> c = findLoadedClass(cn);
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if (c == null) {
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try {
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c = findClass(cn);
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} catch (ClassNotFoundException e) {
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c = getParent().loadClass(cn);
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}
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}
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if (resolve) {
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resolveClass(c);
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}
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return c;
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}
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}
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};
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}
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static URL toURL(Path path) {
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try {
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return path.toUri().toURL();
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} catch (MalformedURLException e) {
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throw new RuntimeException(e);
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}
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}
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}
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