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10230
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1 /*
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2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23
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24 import java.io.File;
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25 import java.net.MalformedURLException;
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26 import java.net.URL;
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27 import java.net.URLClassLoader;
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28 import java.nio.file.Paths;
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29 import java.util.ArrayList;
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30
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31 public class ClassUnloadCommon {
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32 public static class TestFailure extends RuntimeException {
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33 TestFailure(String msg) {
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34 super(msg);
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35 }
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36 }
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37
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38 public static void failIf(boolean value, String msg) {
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39 if (value) throw new TestFailure("Test failed: " + msg);
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40 }
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41
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42 private static volatile Object dummy = null;
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43 private static void allocateMemory(int kilobytes) {
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44 ArrayList<byte[]> l = new ArrayList<>();
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45 dummy = l;
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46 for (int i = kilobytes; i > 0; i -= 1) {
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47 l.add(new byte[1024]);
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48 }
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49 l = null;
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50 dummy = null;
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51 }
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52
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53 public static void triggerUnloading() {
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54 allocateMemory(16 * 1024); // yg size is 8m with cms, force young collection
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55 System.gc();
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56 }
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57
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58 public static ClassLoader newClassLoader() {
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59 try {
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60 return new URLClassLoader(new URL[] {
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61 Paths.get(System.getProperty("test.classes",".") + File.separatorChar + "classes").toUri().toURL(),
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62 }, null);
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63 } catch (MalformedURLException e){
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64 throw new RuntimeException("Unexpected URL conversion failure", e);
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65 }
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66 }
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67
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68 }
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