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 package sun.management; |
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26 |
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27 import java.lang.management.GarbageCollectorMXBean; |
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28 import java.lang.management.MemoryUsage; |
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29 import javax.management.openmbean.OpenType; |
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30 import javax.management.openmbean.SimpleType; |
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31 import javax.management.openmbean.TabularType; |
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32 import javax.management.openmbean.TabularData; |
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33 import javax.management.openmbean.TabularDataSupport; |
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34 import javax.management.openmbean.CompositeType; |
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35 import javax.management.openmbean.CompositeData; |
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36 import javax.management.openmbean.CompositeDataSupport; |
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37 import javax.management.openmbean.OpenDataException; |
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38 import com.sun.management.GcInfo; |
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39 |
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40 /** |
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41 * Helper class to build composite data. |
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42 */ |
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43 public class GcInfoBuilder { |
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44 private final GarbageCollectorMXBean gc; |
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45 private final String[] poolNames; |
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46 private String[] allItemNames; |
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47 |
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48 // GC-specific composite type: |
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49 // Each GarbageCollectorMXBean may have different GC-specific attributes |
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50 // the CompositeType for the GcInfo could be different. |
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51 private CompositeType gcInfoCompositeType; |
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52 |
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53 // GC-specific items |
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54 private final int gcExtItemCount; |
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55 private final String[] gcExtItemNames; |
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56 private final String[] gcExtItemDescs; |
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57 private final char[] gcExtItemTypes; |
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58 |
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59 GcInfoBuilder(GarbageCollectorMXBean gc, String[] poolNames) { |
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60 this.gc = gc; |
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61 this.poolNames = poolNames; |
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62 this.gcExtItemCount = getNumGcExtAttributes(gc); |
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63 this.gcExtItemNames = new String[gcExtItemCount]; |
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64 this.gcExtItemDescs = new String[gcExtItemCount]; |
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65 this.gcExtItemTypes = new char[gcExtItemCount]; |
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66 |
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67 // Fill the information about extension attributes |
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68 fillGcAttributeInfo(gc, gcExtItemCount, gcExtItemNames, |
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69 gcExtItemTypes, gcExtItemDescs); |
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70 |
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71 // lazily build the CompositeType for the GcInfo |
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72 // including the GC-specific extension attributes |
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73 this.gcInfoCompositeType = null; |
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74 } |
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75 |
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76 GcInfo getLastGcInfo() { |
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77 MemoryUsage[] usageBeforeGC = new MemoryUsage[poolNames.length]; |
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78 MemoryUsage[] usageAfterGC = new MemoryUsage[poolNames.length]; |
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79 Object[] values = new Object[gcExtItemCount]; |
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80 |
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81 return getLastGcInfo0(gc, gcExtItemCount, values, gcExtItemTypes, |
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82 usageBeforeGC, usageAfterGC); |
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83 } |
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84 |
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85 public String[] getPoolNames() { |
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86 return poolNames; |
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87 } |
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88 |
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89 int getGcExtItemCount() { |
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90 return gcExtItemCount; |
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91 } |
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92 |
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93 // Returns the CompositeType for the GcInfo including |
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94 // the extension attributes |
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95 synchronized CompositeType getGcInfoCompositeType() { |
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96 if (gcInfoCompositeType != null) |
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97 return gcInfoCompositeType; |
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98 |
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99 // First, fill with the attributes in the GcInfo |
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100 String[] gcInfoItemNames = GcInfoCompositeData.getBaseGcInfoItemNames(); |
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101 OpenType<?>[] gcInfoItemTypes = GcInfoCompositeData.getBaseGcInfoItemTypes(); |
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102 int numGcInfoItems = gcInfoItemNames.length; |
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103 |
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104 int itemCount = numGcInfoItems + gcExtItemCount; |
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105 allItemNames = new String[itemCount]; |
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106 String[] allItemDescs = new String[itemCount]; |
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107 OpenType<?>[] allItemTypes = new OpenType<?>[itemCount]; |
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108 |
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109 System.arraycopy(gcInfoItemNames, 0, allItemNames, 0, numGcInfoItems); |
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110 System.arraycopy(gcInfoItemNames, 0, allItemDescs, 0, numGcInfoItems); |
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111 System.arraycopy(gcInfoItemTypes, 0, allItemTypes, 0, numGcInfoItems); |
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112 |
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113 // Then fill with the extension GC-specific attributes, if any. |
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114 if (gcExtItemCount > 0) { |
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115 fillGcAttributeInfo(gc, gcExtItemCount, gcExtItemNames, |
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116 gcExtItemTypes, gcExtItemDescs); |
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117 System.arraycopy(gcExtItemNames, 0, allItemNames, |
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118 numGcInfoItems, gcExtItemCount); |
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119 System.arraycopy(gcExtItemDescs, 0, allItemDescs, |
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120 numGcInfoItems, gcExtItemCount); |
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121 for (int i = numGcInfoItems, j = 0; j < gcExtItemCount; i++, j++) { |
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122 switch (gcExtItemTypes[j]) { |
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123 case 'Z': |
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124 allItemTypes[i] = SimpleType.BOOLEAN; |
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125 break; |
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126 case 'B': |
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127 allItemTypes[i] = SimpleType.BYTE; |
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128 break; |
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129 case 'C': |
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130 allItemTypes[i] = SimpleType.CHARACTER; |
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131 break; |
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132 case 'S': |
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133 allItemTypes[i] = SimpleType.SHORT; |
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134 break; |
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135 case 'I': |
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136 allItemTypes[i] = SimpleType.INTEGER; |
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137 break; |
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138 case 'J': |
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139 allItemTypes[i] = SimpleType.LONG; |
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140 break; |
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141 case 'F': |
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142 allItemTypes[i] = SimpleType.FLOAT; |
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143 break; |
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144 case 'D': |
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145 allItemTypes[i] = SimpleType.DOUBLE; |
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146 break; |
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147 default: |
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148 throw new AssertionError( |
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149 "Unsupported type [" + gcExtItemTypes[i] + "]"); |
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150 } |
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151 } |
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152 } |
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153 |
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154 CompositeType gict = null; |
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155 try { |
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156 final String typeName = |
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157 "sun.management." + gc.getName() + ".GcInfoCompositeType"; |
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158 |
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159 gict = new CompositeType(typeName, |
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160 "CompositeType for GC info for " + |
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161 gc.getName(), |
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162 allItemNames, |
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163 allItemDescs, |
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164 allItemTypes); |
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165 } catch (OpenDataException e) { |
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166 // shouldn't reach here |
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167 throw Util.newException(e); |
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168 } |
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169 gcInfoCompositeType = gict; |
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170 |
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171 return gcInfoCompositeType; |
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172 } |
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173 |
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174 synchronized String[] getItemNames() { |
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175 if (allItemNames == null) { |
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176 // initialize when forming the composite type |
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177 getGcInfoCompositeType(); |
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178 } |
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179 return allItemNames; |
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180 } |
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181 |
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182 // Retrieve information about extension attributes |
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183 private native int getNumGcExtAttributes(GarbageCollectorMXBean gc); |
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184 private native void fillGcAttributeInfo(GarbageCollectorMXBean gc, |
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185 int numAttributes, |
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186 String[] attributeNames, |
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187 char[] types, |
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188 String[] descriptions); |
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189 |
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190 /** |
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191 * Returns the last GcInfo |
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192 * |
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193 * @param gc GarbageCollectorMXBean that the gc info is associated with. |
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194 * @param numExtAtts number of extension attributes |
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195 * @param extAttValues Values of extension attributes to be filled. |
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196 * @param before Memory usage before GC to be filled. |
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197 * @param after Memory usage after GC to be filled. |
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198 */ |
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199 private native GcInfo getLastGcInfo0(GarbageCollectorMXBean gc, |
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200 int numExtAtts, |
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201 Object[] extAttValues, |
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202 char[] extAttTypes, |
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203 MemoryUsage[] before, |
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204 MemoryUsage[] after); |
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205 } |
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