1 /* |
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2 * Copyright (c) 2003, 2014, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package sun.management; |
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27 |
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28 import java.util.*; |
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29 import com.sun.management.VMOption; |
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30 import com.sun.management.VMOption.Origin; |
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31 import java.security.AccessController; |
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32 |
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33 /** |
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34 * Flag class is a helper class for constructing a VMOption. |
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35 * It has the static methods for getting the Flag objects, each |
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36 * corresponds to one VMOption. |
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37 * |
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38 */ |
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39 class Flag { |
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40 private String name; |
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41 private Object value; |
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42 private Origin origin; |
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43 private boolean writeable; |
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44 private boolean external; |
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45 |
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46 Flag(String name, Object value, boolean writeable, |
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47 boolean external, Origin origin) { |
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48 this.name = name; |
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49 this.value = value == null ? "" : value ; |
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50 this.origin = origin; |
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51 this.writeable = writeable; |
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52 this.external = external; |
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53 } |
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54 |
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55 Object getValue() { |
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56 return value; |
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57 } |
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58 |
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59 boolean isWriteable() { |
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60 return writeable; |
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61 } |
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62 |
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63 boolean isExternal() { |
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64 return external; |
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65 } |
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66 |
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67 VMOption getVMOption() { |
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68 return new VMOption(name, value.toString(), writeable, origin); |
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69 } |
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70 |
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71 static Flag getFlag(String name) { |
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72 String[] names = new String[1]; |
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73 names[0] = name; |
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74 |
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75 List<Flag> flags = getFlags(names, 1); |
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76 if (flags.isEmpty()) { |
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77 return null; |
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78 } else { |
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79 // flags should have only one element |
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80 return flags.get(0); |
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81 } |
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82 } |
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83 |
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84 static List<Flag> getAllFlags() { |
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85 int numFlags = getInternalFlagCount(); |
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86 |
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87 // Get all internal flags with names = null |
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88 return getFlags(null, numFlags); |
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89 } |
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90 |
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91 private static List<Flag> getFlags(String[] names, int numFlags) { |
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92 Flag[] flags = new Flag[numFlags]; |
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93 int count = getFlags(names, flags, numFlags); |
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94 |
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95 List<Flag> result = new ArrayList<>(); |
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96 for (Flag f : flags) { |
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97 if (f != null) { |
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98 result.add(f); |
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99 } |
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100 } |
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101 return result; |
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102 } |
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103 |
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104 private static native String[] getAllFlagNames(); |
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105 // getFlags sets each element in the given flags array |
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106 // with a Flag object only if the name is valid and the |
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107 // type is supported. The flags array may contain null elements. |
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108 private static native int getFlags(String[] names, Flag[] flags, int count); |
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109 private static native int getInternalFlagCount(); |
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110 |
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111 // These set* methods are synchronized on the class object |
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112 // to avoid multiple threads updating the same flag at the same time. |
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113 static synchronized native void setLongValue(String name, long value); |
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114 static synchronized native void setDoubleValue(String name, double value); |
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115 static synchronized native void setBooleanValue(String name, boolean value); |
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116 static synchronized native void setStringValue(String name, String value); |
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117 |
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118 static { |
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119 AccessController.doPrivileged( |
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120 new java.security.PrivilegedAction<Void>() { |
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121 public Void run() { |
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122 System.loadLibrary("management"); |
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123 return null; |
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124 } |
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125 }); |
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126 initialize(); |
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127 } |
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128 private static native void initialize(); |
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129 } |
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