author | weijun |
Thu, 11 Dec 2014 15:23:02 +0800 | |
changeset 27957 | 24b4e6082f19 |
parent 27735 | 8a0caceb319b |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2003, 2014, 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. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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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 sun.management; |
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import java.util.*; |
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import com.sun.management.VMOption; |
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import com.sun.management.VMOption.Origin; |
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import java.security.AccessController; |
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/** |
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* Flag class is a helper class for constructing a VMOption. |
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* It has the static methods for getting the Flag objects, each |
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* corresponds to one VMOption. |
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* |
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*/ |
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class Flag { |
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private String name; |
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private Object value; |
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private Origin origin; |
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private boolean writeable; |
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private boolean external; |
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Flag(String name, Object value, boolean writeable, |
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boolean external, Origin origin) { |
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this.name = name; |
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this.value = value == null ? "" : value ; |
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this.origin = origin; |
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this.writeable = writeable; |
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this.external = external; |
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} |
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Object getValue() { |
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return value; |
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} |
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boolean isWriteable() { |
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return writeable; |
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} |
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boolean isExternal() { |
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return external; |
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} |
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VMOption getVMOption() { |
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return new VMOption(name, value.toString(), writeable, origin); |
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} |
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static Flag getFlag(String name) { |
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String[] names = new String[1]; |
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names[0] = name; |
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List<Flag> flags = getFlags(names, 1); |
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if (flags.isEmpty()) { |
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return null; |
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} else { |
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// flags should have only one element |
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return flags.get(0); |
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} |
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} |
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static List<Flag> getAllFlags() { |
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int numFlags = getInternalFlagCount(); |
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// Get all internal flags with names = null |
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return getFlags(null, numFlags); |
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} |
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private static List<Flag> getFlags(String[] names, int numFlags) { |
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Flag[] flags = new Flag[numFlags]; |
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int count = getFlags(names, flags, numFlags); |
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List<Flag> result = new ArrayList<>(); |
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for (Flag f : flags) { |
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if (f != null) { |
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result.add(f); |
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} |
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} |
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return result; |
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} |
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private static native String[] getAllFlagNames(); |
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// getFlags sets each element in the given flags array |
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// with a Flag object only if the name is valid and the |
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// type is supported. The flags array may contain null elements. |
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private static native int getFlags(String[] names, Flag[] flags, int count); |
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private static native int getInternalFlagCount(); |
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// These set* methods are synchronized on the class object |
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// to avoid multiple threads updating the same flag at the same time. |
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static synchronized native void setLongValue(String name, long value); |
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static synchronized native void setDoubleValue(String name, double value); |
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static synchronized native void setBooleanValue(String name, boolean value); |
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static synchronized native void setStringValue(String name, String value); |
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static { |
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AccessController.doPrivileged( |
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new java.security.PrivilegedAction<Void>() { |
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public Void run() { |
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System.loadLibrary("management"); |
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return null; |
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} |
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}); |
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initialize(); |
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} |
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private static native void initialize(); |
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} |