| /* |
| * Copyright (c) 2010, 2016, 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. |
| */ |
| |
| import java.io.BufferedReader; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| |
| import static jdk.testlibrary.Asserts.assertGreaterThan; |
| import jdk.testlibrary.ProcessTools; |
| |
| import com.sun.tools.attach.AttachNotSupportedException; |
| import com.sun.tools.attach.VirtualMachine; |
| |
| import sun.tools.attach.HotSpotVirtualMachine; |
| |
| /* |
| * @test |
| * @bug 6942989 |
| * @summary Check for WeakReference leak in Logger and anonymous Logger objects |
| * @library /lib/testlibrary |
| * @modules jdk.attach/sun.tools.attach |
| * java.logging |
| * @build jdk.testlibrary.ProcessTools |
| * @run main/othervm -Djdk.attach.allowAttachSelf TestLoggerWeakRefLeak Logger |
| * @run main/othervm -Djdk.attach.allowAttachSelf TestLoggerWeakRefLeak AnonymousLogger |
| */ |
| public class TestLoggerWeakRefLeak { |
| |
| private static final String TARGET_CLASS = "java.lang.ref.WeakReference"; |
| private static final int INSTANCE_COUNT = 100; |
| private static int loggerCount = 0; |
| |
| public static void main(String[] args) throws Exception { |
| if (args[0].equals("AnonymousLogger")) { |
| System.out.println("Test for WeakReference leak in AnonymousLogger object"); |
| testIfLeaking(TestLoggerWeakRefLeak::callAnonymousLogger); |
| } else { |
| System.out.println("Test for WeakReference leak in Logger object"); |
| testIfLeaking(TestLoggerWeakRefLeak::callLogger); |
| } |
| } |
| |
| /** |
| * For these particular WeakReference leaks, the count was always observed |
| * to be increasing so if decreasing or the same count is observed, |
| * then there is no leak. |
| */ |
| private static void testIfLeaking(Runnable callLogger) throws Exception { |
| long count = 0; |
| int instanceCount = 0; |
| int previousInstanceCount = 0; |
| int increasingCount = 0; |
| int decreasingCount = 0; |
| |
| while (true) { |
| callLogger.run(); |
| count += INSTANCE_COUNT; |
| |
| if ((count % 1000) == 0) { |
| System.out.println("call count = " + count); |
| |
| instanceCount = getInstanceCountFromHeapHisto(); |
| if (instanceCount > previousInstanceCount) { |
| increasingCount++; |
| } else { |
| decreasingCount++; |
| System.out.println("increasing count: " + increasingCount); |
| System.out.println("decreasing or the same count: " + decreasingCount); |
| System.out.println("Test passed: decreasing or the same instance count is observed"); |
| break; |
| } |
| previousInstanceCount = instanceCount; |
| } |
| |
| delayExecution(); |
| } |
| } |
| |
| /** |
| * This Logger call is leaking two different WeakReferences: |
| * - one in LogManager.LogNode |
| * - one in Logger.kids |
| */ |
| private static void callLogger() { |
| for (int i = 0; i < INSTANCE_COUNT; i++) { |
| java.util.logging.Logger.getLogger("logger-" + loggerCount); |
| if (++loggerCount >= 25000) { |
| // Limit the Logger namespace used by the test so the weak refs |
| // in LogManager.loggers that are being properly managed |
| // don't skew the counts by too much. |
| loggerCount = 0; |
| } |
| } |
| } |
| |
| /** |
| * This Logger call is leaking a WeakReference in Logger.kids |
| */ |
| private static void callAnonymousLogger() { |
| for (int i = 0; i < INSTANCE_COUNT; i++) { |
| java.util.logging.Logger.getAnonymousLogger(); |
| } |
| } |
| |
| /** |
| * 'vm.heapHisto("-live")' will request a full GC |
| */ |
| private static int getInstanceCountFromHeapHisto() throws AttachNotSupportedException, Exception { |
| int instanceCount = 0; |
| |
| HotSpotVirtualMachine vm = (HotSpotVirtualMachine) VirtualMachine |
| .attach(Long.toString(ProcessTools.getProcessId())); |
| try { |
| try (InputStream heapHistoStream = vm.heapHisto("-live"); |
| BufferedReader in = new BufferedReader(new InputStreamReader(heapHistoStream))) { |
| String inputLine; |
| while ((inputLine = in.readLine()) != null) { |
| if (inputLine.contains(TARGET_CLASS)) { |
| instanceCount = Integer.parseInt(inputLine |
| .split("[ ]+")[2]); |
| System.out.println("instance count: " + instanceCount); |
| break; |
| } |
| } |
| } |
| } finally { |
| vm.detach(); |
| } |
| |
| assertGreaterThan(instanceCount, 0, "No instances of " + TARGET_CLASS + " are found"); |
| |
| return instanceCount; |
| } |
| |
| /** |
| * Delay for 1/10 of a second to avoid CPU saturation |
| */ |
| private static void delayExecution() { |
| try { |
| Thread.sleep(100); |
| } catch (InterruptedException ie) { |
| // Ignore any exceptions |
| } |
| } |
| |
| } |