| /* |
| * Copyright (c) 2014, 2017, 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 |
| * @bug 8054823 |
| * @summary Tests the setFlag and printFlag attach command |
| * @library /test/lib |
| * @modules java.base/jdk.internal.misc |
| * java.compiler |
| * java.management |
| * jdk.attach/sun.tools.attach |
| * jdk.internal.jvmstat/sun.jvmstat.monitor |
| * @run main AttachSetGetFlag |
| */ |
| |
| import java.io.BufferedReader; |
| import java.io.InputStreamReader; |
| import java.io.InputStream; |
| import java.lang.reflect.Field; |
| import java.nio.file.Files; |
| import java.nio.file.Path; |
| import java.nio.file.Paths; |
| |
| import sun.tools.attach.HotSpotVirtualMachine; |
| |
| import jdk.test.lib.Asserts; |
| import jdk.test.lib.Platform; |
| import jdk.test.lib.process.ProcessTools; |
| import com.sun.tools.attach.VirtualMachine; |
| |
| public class AttachSetGetFlag { |
| |
| public static void main(String... args) throws Exception { |
| // Test a manageable uintx flag. |
| testGetFlag("MaxHeapFreeRatio", "60"); |
| testSetFlag("MaxHeapFreeRatio", "50", "60"); |
| |
| // Test a non-manageable size_t flag. |
| // Since it is not manageable, we can't test the setFlag functionality. |
| testGetFlag("ArrayAllocatorMallocLimit", "128"); |
| // testSetFlag("ArrayAllocatorMallocLimit", "64", "128"); |
| |
| // Test a uint flag. |
| testGetFlag("ParallelGCThreads", "10"); |
| } |
| |
| public static ProcessBuilder runTarget(String flagName, String flagValue) throws Exception { |
| return ProcessTools.createJavaProcessBuilder( |
| "-XX:+UnlockExperimentalVMOptions", |
| "-XX:" + flagName + "=" + flagValue, |
| "AttachSetGetFlag$Target"); |
| } |
| |
| public static void testGetFlag(String flagName, String flagValue) throws Exception { |
| ProcessBuilder pb = runTarget(flagName, flagValue); |
| |
| Process target = pb.start(); |
| |
| try { |
| waitForReady(target); |
| |
| int pid = (int)target.getPid(); |
| |
| HotSpotVirtualMachine vm = (HotSpotVirtualMachine)VirtualMachine.attach(((Integer)pid).toString()); |
| |
| // Test Get |
| BufferedReader remoteDataReader = new BufferedReader(new InputStreamReader( |
| vm.printFlag(flagName))); |
| |
| boolean foundExpectedLine = false; |
| |
| String line = null; |
| while((line = remoteDataReader.readLine()) != null) { |
| System.out.println("printFlag: " + line); |
| if (line.equals("-XX:" + flagName + "=" + flagValue)) { |
| foundExpectedLine = true; |
| } |
| } |
| |
| Asserts.assertTrue(foundExpectedLine, "Didn't get the expected output: '-XX:" + flagName + "=" + flagValue + "'"); |
| |
| vm.detach(); |
| } |
| finally { |
| target.destroy(); |
| target.waitFor(); |
| } |
| } |
| |
| public static void testSetFlag(String flagName, String initialFlagValue, String flagValue) throws Exception { |
| ProcessBuilder pb = runTarget(flagName, initialFlagValue); |
| |
| Process target = pb.start(); |
| |
| try { |
| waitForReady(target); |
| |
| int pid = (int)target.getPid(); |
| |
| HotSpotVirtualMachine vm = (HotSpotVirtualMachine)VirtualMachine.attach(((Integer)pid).toString()); |
| |
| // First set the value. |
| BufferedReader remoteDataReader = new BufferedReader(new InputStreamReader( |
| vm.setFlag(flagName, flagValue))); |
| |
| String line; |
| while((line = remoteDataReader.readLine()) != null) { |
| System.out.println("setFlag: " + line); |
| // Just empty the stream. |
| } |
| remoteDataReader.close(); |
| |
| // Then read and make sure we get back the set value. |
| remoteDataReader = new BufferedReader(new InputStreamReader(vm.printFlag(flagName))); |
| |
| boolean foundExpectedLine = false; |
| line = null; |
| while((line = remoteDataReader.readLine()) != null) { |
| System.out.println("getFlag: " + line); |
| if (line.equals("-XX:" + flagName + "=" + flagValue)) { |
| foundExpectedLine = true; |
| } |
| } |
| |
| Asserts.assertTrue(foundExpectedLine, "Didn't get the expected output: '-XX:" + flagName + "=" + flagValue + "'"); |
| |
| vm.detach(); |
| |
| } finally { |
| target.destroy(); |
| target.waitFor(); |
| } |
| } |
| |
| private static void waitForReady(Process target) throws Exception { |
| InputStream os = target.getInputStream(); |
| try (BufferedReader reader = new BufferedReader(new InputStreamReader(os))) { |
| String line; |
| while ((line = reader.readLine()) != null) { |
| if ("Ready".equals(line)) { |
| return; |
| } |
| } |
| } |
| } |
| |
| |
| public static class Target { |
| public static void main(String [] args) throws Exception { |
| System.out.println("Ready"); |
| System.out.flush(); |
| while (true) { |
| Thread.sleep(1000); |
| } |
| } |
| } |
| } |