1 /* 2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package com.oracle.java.testlibrary; 24 25 import com.sun.management.HotSpotDiagnosticMXBean; 26 import com.sun.management.VMOption; 27 import java.lang.management.ManagementFactory; 28 29 /** 30 * Simple class to check writability, invalid and valid values for VMOption 31 */ 32 public class VMOptionValueChecker { 33 34 /** 35 * Get vm option from PlatformMXBean and checks that it is writable 36 * 37 * @param name of option 38 * @return parsed value 39 * @throws RuntimeException if option if not writable 40 */ 41 public static int getIntWritableValue(String name) { 42 43 VMOption option = ManagementFactory. 44 getPlatformMXBean(HotSpotDiagnosticMXBean.class). 45 getVMOption(name); 46 47 if (!option.isWriteable()) { 48 throw new RuntimeException(name + " is not writable"); 49 } 50 51 return Integer.parseInt(option.getValue()); 52 } 53 54 /** 55 * Checks that value cannot be set 56 * 57 * @param name of flag 58 * @param value string representation of value to set 59 * @throws RuntimeException on error - when expected exception hasn't been 60 * thrown 61 */ 62 public static void checkInvalidValue(String name, String value) { 63 // should throw 64 try { 65 ManagementFactory. 66 getPlatformMXBean(HotSpotDiagnosticMXBean.class). 67 setVMOption(name, value); 68 69 } catch (IllegalArgumentException e) { 70 return; 71 } 72 73 throw new RuntimeException("Expected IllegalArgumentException was not thrown, " + name + "= " + value); 74 } 75 76 /** 77 * Checks that value can be set 78 * 79 * @param name of flag to set 80 * @param value string representation of value to set 81 * @throws RuntimeException on error - when value in vm is not equal to 82 * origin 83 */ 84 public static void checkValid(String name, String value) { 85 ManagementFactory. 86 getPlatformMXBean(HotSpotDiagnosticMXBean.class). 87 setVMOption(name, value); 88 89 VMOption option = ManagementFactory. 90 getPlatformMXBean(HotSpotDiagnosticMXBean.class). 91 getVMOption(name); 92 93 if (!option.getValue().equals(value)) { 94 throw new RuntimeException("Actual value of " + name + " \"" + option.getValue() + "\" not equal origin \"" + value + "\""); 95 } 96 } 97 98 }