--- old/test/testlibrary/jdk/test/lib/DynamicVMOption.java 2016-08-11 13:49:06.187125000 -0400 +++ /dev/null 2016-08-11 13:49:06.000000000 -0400 @@ -1,165 +0,0 @@ -/* - * Copyright (c) 2014, 2015, 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. - */ -package jdk.test.lib; - -import com.sun.management.HotSpotDiagnosticMXBean; -import java.lang.management.ManagementFactory; - -/** - * A utility class to work with VM options which could be altered during - * execution. - * - * This class is a wrapper around {@code com.sun.management.VMOption}. - * It provides more convenient interface to read/write the values. - * - */ -public class DynamicVMOption { - - private final HotSpotDiagnosticMXBean mxBean; - - /** - * VM option name, like "MinHeapFreeRatio". - */ - public final String name; - - /** - * Creates an instance of DynamicVMOption. - * - * @param name the VM option name - */ - public DynamicVMOption(String name) { - this.name = name; - mxBean = ManagementFactory.getPlatformMXBean(HotSpotDiagnosticMXBean.class); - } - - /** - * Sets a new value for the option. - * Trying to set not applicable value will cause IllegalArgumentException. - * Behavior with null is undefined, most likely NPE will be thrown. - * - * @param newValue the value to be set - * @see #getValue() - * @throws IllegalArgumentException if newValue is not applicable to the option - */ - public final void setValue(String newValue) { - mxBean.setVMOption(name, newValue); - } - - /** - * Returns the value of option. - * - * @return the current option value - * @see #setValue(java.lang.String) - */ - public final String getValue() { - return mxBean.getVMOption(name).getValue(); - } - - /** - * Returns true, if option is writable, false otherwise. - * - * @return true, if option is writable, false otherwise - */ - public final boolean isWriteable() { - return mxBean.getVMOption(name).isWriteable(); - } - - /** - * Checks if the given value is applicable for the option. - * - * This method tries to set the option to the new value. If no exception - * has been thrown the value is treated as valid. - * - * Calling this method will not change the option value. After an attempt - * to set a new value, the option will be restored to its previous value. - * - * @param value the value to verify - * @return true if option could be set to the given value - */ - public boolean isValidValue(String value) { - boolean isValid = true; - String oldValue = getValue(); - try { - setValue(value); - } catch (NullPointerException e) { - if (value == null) { - isValid = false; - } - } catch (IllegalArgumentException e) { - isValid = false; - } finally { - setValue(oldValue); - } - return isValid; - } - - /** - * Returns the value of the given VM option as String. - * - * This is a simple shortcut for {@code new DynamicVMOption(name).getValue()} - * - * @param name the name of VM option - * @return value as a string - * @see #getValue() - */ - public static String getString(String name) { - return new DynamicVMOption(name).getValue(); - } - - /** - * Returns the value of the given option as int. - * - * @param name the name of VM option - * @return value parsed as integer - * @see #getString(java.lang.String) - * - */ - public static int getInt(String name) { - return Integer.parseInt(getString(name)); - } - - /** - * Sets the VM option to a new value. - * - * This is a simple shortcut for {@code new DynamicVMOption(name).setValue(value)} - * - * @param name the name of VM option - * @param value the value to be set - * @see #setValue(java.lang.String) - */ - public static void setString(String name, String value) { - new DynamicVMOption(name).setValue(value); - } - - /** - * Sets the VM option value to a new integer value. - * - * @param name the name of VM option - * @param value the integer value to be set - * @see #setString(java.lang.String, java.lang.String) - */ - public static void setInt(String name, int value) { - new DynamicVMOption(name).setValue(Integer.toString(value)); - } - -}