--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/serviceability/dcmd/ClassLoaderStatsTest.java Wed Jun 04 11:05:30 2014 +0200
@@ -0,0 +1,155 @@
+/*
+ * Copyright (c) 2014, 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.
+ */
+
+/*
+ * @test
+ *
+ * @build ClassLoaderStatsTest DcmdUtil
+ * @run main ClassLoaderStatsTest
+ */
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.StringReader;
+import java.nio.ByteBuffer;
+import java.nio.channels.FileChannel;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class ClassLoaderStatsTest {
+
+ // ClassLoader Parent CLD* Classes ChunkSz BlockSz Type
+ // 0x00000007c0215928 0x0000000000000000 0x0000000000000000 0 0 0 org.eclipse.osgi.baseadaptor.BaseAdaptor$1
+ // 0x00000007c0009868 0x0000000000000000 0x00007fc52aebcc80 1 6144 3768 sun.reflect.DelegatingClassLoader
+ // 0x00000007c0009868 0x0000000000000000 0x00007fc52b8916d0 1 6144 3688 sun.reflect.DelegatingClassLoader
+ // 0x00000007c0009868 0x00000007c0038ba8 0x00007fc52afb8760 1 6144 3688 sun.reflect.DelegatingClassLoader
+ // 0x00000007c0009868 0x0000000000000000 0x00007fc52afbb1a0 1 6144 3688 sun.reflect.DelegatingClassLoader
+ // 0x0000000000000000 0x0000000000000000 0x00007fc523416070 5019 30060544 29956216 <boot classloader>
+ // 455 1210368 672848 + unsafe anonymous classes
+ // 0x00000007c016b5c8 0x00000007c0038ba8 0x00007fc52a995000 5 8192 5864 org.netbeans.StandardModule$OneModuleClassLoader
+ // 0x00000007c0009868 0x00000007c016b5c8 0x00007fc52ac13640 1 6144 3896 sun.reflect.DelegatingClassLoader
+ // ...
+
+ static Pattern clLine = Pattern.compile("0x\\p{XDigit}*\\s*0x\\p{XDigit}*\\s*0x\\p{XDigit}*\\s*(\\d*)\\s*(\\d*)\\s*(\\d*)\\s*(.*)");
+ static Pattern anonLine = Pattern.compile("\\s*(\\d*)\\s*(\\d*)\\s*(\\d*)\\s*.*");
+
+ public static DummyClassLoader dummyloader;
+
+ public static void main(String arg[]) throws Exception {
+
+ // create a classloader and load our special class
+ dummyloader = new DummyClassLoader();
+ Class<?> c = Class.forName("TestClass", true, dummyloader);
+ if (c.getClassLoader() != dummyloader) {
+ throw new RuntimeException("TestClass defined by wrong classloader: " + c.getClassLoader());
+ }
+
+ String result = DcmdUtil.executeDcmd("VM.classloader_stats");
+ BufferedReader r = new BufferedReader(new StringReader(result));
+ String line;
+ while((line = r.readLine()) != null) {
+ Matcher m = clLine.matcher(line);
+ if (m.matches()) {
+ // verify that DummyClassLoader has loaded 1 class and 1 anonymous class
+ if (m.group(4).equals("ClassLoaderStatsTest$DummyClassLoader")) {
+ System.out.println("line: " + line);
+ if (!m.group(1).equals("1")) {
+ throw new Exception("Should have loaded 1 class: " + line);
+ }
+ checkPositiveInt(m.group(2));
+ checkPositiveInt(m.group(3));
+
+ String next = r.readLine();
+ System.out.println("next: " + next);
+ Matcher m1 = anonLine.matcher(next);
+ m1.matches();
+ if (!m1.group(1).equals("1")) {
+ throw new Exception("Should have loaded 1 anonymous class, but found : " + m1.group(1));
+ }
+ checkPositiveInt(m1.group(2));
+ checkPositiveInt(m1.group(3));
+ }
+ }
+ }
+ }
+
+ private static void checkPositiveInt(String s) throws Exception {
+ if (Integer.parseInt(s) <= 0) {
+ throw new Exception("Value should have been > 0: " + s);
+ }
+ }
+
+ public static class DummyClassLoader extends ClassLoader {
+
+ public static final String CLASS_NAME = "TestClass";
+
+ static ByteBuffer readClassFile(String name)
+ {
+ File f = new File(System.getProperty("test.classes", "."),
+ name);
+ try (FileInputStream fin = new FileInputStream(f);
+ FileChannel fc = fin.getChannel())
+ {
+ return fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
+ } catch (IOException e) {
+ throw new RuntimeException("Can't open file: " + name, e);
+ }
+ }
+
+ protected Class<?> loadClass(String name, boolean resolve)
+ throws ClassNotFoundException
+ {
+ Class<?> c;
+ if (!"TestClass".equals(name)) {
+ c = super.loadClass(name, resolve);
+ } else {
+ // should not delegate to the system class loader
+ c = findClass(name);
+ if (resolve) {
+ resolveClass(c);
+ }
+ }
+ return c;
+ }
+
+ protected Class<?> findClass(String name)
+ throws ClassNotFoundException
+ {
+ if (!"TestClass".equals(name)) {
+ throw new ClassNotFoundException("Unexpected class: " + name);
+ }
+ return defineClass(name, readClassFile(name + ".class"), null);
+ }
+ } /* DummyClassLoader */
+
+}
+
+class TestClass {
+ static {
+ // force creation of anonymous class (for the lambdaform)
+ Runnable r = () -> System.out.println("Hello");
+ r.run();
+ }
+}