77 lines
2.7 KiB
Java
77 lines
2.7 KiB
Java
/*
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* Copyright (c) 2013, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package gc.metaspace;
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import java.lang.management.RuntimeMXBean;
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import java.lang.management.ManagementFactory;
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import java.util.List;
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/**
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* This class provides access to the input arguments to the VM.
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*/
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public class InputArguments {
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private static final List<String> args;
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static {
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RuntimeMXBean runtimeMxBean = ManagementFactory.getRuntimeMXBean();
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args = runtimeMxBean.getInputArguments();
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}
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/**
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* Returns true if {@code arg} is an input argument to the VM.
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*
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* This is useful for checking boolean flags such as -XX:+UseSerialGC or
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* -XX:-UsePerfData.
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*
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* @param arg The name of the argument.
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* @return {@code true} if the given argument is an input argument,
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* otherwise {@code false}.
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*/
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public static boolean contains(String arg) {
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return args.contains(arg);
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}
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/**
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* Returns true if {@code prefix} is the start of an input argument to the
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* VM.
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*
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* This is useful for checking if flags describing a quantity, such as
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* -XX:+MaxMetaspaceSize=100m, is set without having to know the quantity.
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* To check if the flag -XX:MaxMetaspaceSize is set, use
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* {@code InputArguments.containsPrefix("-XX:MaxMetaspaceSize")}.
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*
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* @param prefix The start of the argument.
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* @return {@code true} if the given argument is the start of an input
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* argument, otherwise {@code false}.
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*/
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public static boolean containsPrefix(String prefix) {
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for (String arg : args) {
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if (arg.startsWith(prefix)) {
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return true;
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}
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}
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return false;
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}
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}
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