1 /* |
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2 * Copyright (c) 2011, 2013, 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 com.sun.management; |
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27 |
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28 import javax.management.Notification; |
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29 import javax.management.openmbean.CompositeData; |
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30 import javax.management.openmbean.CompositeDataView; |
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31 import javax.management.openmbean.CompositeType; |
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32 import java.util.Collection; |
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33 import java.util.Collections; |
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34 import sun.management.GarbageCollectionNotifInfoCompositeData; |
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35 |
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36 /** |
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37 * The information about a garbage collection |
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38 * |
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39 * <p> |
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40 * A garbage collection notification is emitted by {@link GarbageCollectorMXBean} |
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41 * when the Java virtual machine completes a garbage collection action |
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42 * The notification emitted will contain the garbage collection notification |
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43 * information about the status of the memory: |
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44 * <ul> |
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45 * <li>The name of the garbage collector used to perform the collection.</li> |
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46 * <li>The action performed by the garbage collector.</li> |
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47 * <li>The cause of the garbage collection action.</li> |
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48 * <li>A {@link GcInfo} object containing some statistics about the GC cycle |
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49 (start time, end time) and the memory usage before and after |
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50 the GC cycle.</li> |
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51 * </ul> |
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52 * |
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53 * <p> |
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54 * A {@link CompositeData CompositeData} representing |
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55 * the {@code GarbageCollectionNotificationInfo} object |
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56 * is stored in the |
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57 * {@linkplain javax.management.Notification#setUserData userdata} |
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58 * of a {@linkplain javax.management.Notification notification}. |
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59 * The {@link #from from} method is provided to convert from |
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60 * a {@code CompositeData} to a {@code GarbageCollectionNotificationInfo} |
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61 * object. For example: |
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62 * |
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63 * <blockquote><pre> |
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64 * Notification notif; |
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65 * |
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66 * // receive the notification emitted by a GarbageCollectorMXBean and set to notif |
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67 * ... |
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68 * |
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69 * String notifType = notif.getType(); |
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70 * if (notifType.equals(GarbageCollectionNotificationInfo.GARBAGE_COLLECTION_NOTIFICATION)) { |
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71 * // retrieve the garbage collection notification information |
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72 * CompositeData cd = (CompositeData) notif.getUserData(); |
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73 * GarbageCollectionNotificationInfo info = GarbageCollectionNotificationInfo.from(cd); |
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74 * .... |
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75 * } |
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76 * </pre></blockquote> |
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77 * |
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78 * <p> |
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79 * The type of the notification emitted by a {@code GarbageCollectorMXBean} is: |
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80 * <ul> |
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81 * <li>A {@linkplain #GARBAGE_COLLECTION_NOTIFICATION garbage collection notification}. |
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82 * <br>Used by every notification emitted by the garbage collector, the details about |
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83 * the notification are provided in the {@linkplain #getGcAction action} String |
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84 * </li> |
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85 * </ul> |
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86 **/ |
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87 |
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88 @jdk.Exported |
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89 public class GarbageCollectionNotificationInfo implements CompositeDataView { |
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90 |
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91 private final String gcName; |
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92 private final String gcAction; |
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93 private final String gcCause; |
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94 private final GcInfo gcInfo; |
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95 private final CompositeData cdata; |
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96 |
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97 /** |
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98 * Notification type denoting that |
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99 * the Java virtual machine has completed a garbage collection cycle. |
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100 * This notification is emitted by a {@link GarbageCollectorMXBean}. |
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101 * The value of this notification type is |
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102 * {@code com.sun.management.gc.notification}. |
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103 */ |
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104 public static final String GARBAGE_COLLECTION_NOTIFICATION = |
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105 "com.sun.management.gc.notification"; |
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106 |
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107 /** |
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108 * Constructs a {@code GarbageCollectionNotificationInfo} object. |
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109 * |
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110 * @param gcName The name of the garbage collector used to perform the collection |
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111 * @param gcAction The name of the action performed by the garbage collector |
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112 * @param gcCause The cause of the garbage collection action |
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113 * @param gcInfo a GcInfo object providing statistics about the GC cycle |
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114 */ |
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115 public GarbageCollectionNotificationInfo(String gcName, |
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116 String gcAction, |
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117 String gcCause, |
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118 GcInfo gcInfo) { |
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119 if (gcName == null) { |
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120 throw new NullPointerException("Null gcName"); |
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121 } |
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122 if (gcAction == null) { |
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123 throw new NullPointerException("Null gcAction"); |
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124 } |
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125 if (gcCause == null) { |
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126 throw new NullPointerException("Null gcCause"); |
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127 } |
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128 this.gcName = gcName; |
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129 this.gcAction = gcAction; |
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130 this.gcCause = gcCause; |
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131 this.gcInfo = gcInfo; |
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132 this.cdata = new GarbageCollectionNotifInfoCompositeData(this); |
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133 } |
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134 |
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135 GarbageCollectionNotificationInfo(CompositeData cd) { |
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136 GarbageCollectionNotifInfoCompositeData.validateCompositeData(cd); |
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137 |
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138 this.gcName = GarbageCollectionNotifInfoCompositeData.getGcName(cd); |
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139 this.gcAction = GarbageCollectionNotifInfoCompositeData.getGcAction(cd); |
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140 this.gcCause = GarbageCollectionNotifInfoCompositeData.getGcCause(cd); |
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141 this.gcInfo = GarbageCollectionNotifInfoCompositeData.getGcInfo(cd); |
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142 this.cdata = cd; |
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143 } |
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144 |
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145 /** |
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146 * Returns the name of the garbage collector used to perform the collection |
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147 * |
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148 * @return the name of the garbage collector used to perform the collection |
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149 */ |
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150 public String getGcName() { |
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151 return gcName; |
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152 } |
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153 |
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154 /** |
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155 * Returns the action performed by the garbage collector |
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156 * |
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157 * @return the action performed by the garbage collector |
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158 */ |
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159 public String getGcAction() { |
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160 return gcAction; |
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161 } |
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162 |
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163 /** |
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164 * Returns the cause of the garbage collection |
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165 * |
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166 * @return the cause of the garbage collection |
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167 */ |
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168 public String getGcCause() { |
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169 return gcCause; |
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170 } |
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171 |
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172 /** |
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173 * Returns the GC information related to the last garbage collection |
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174 * |
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175 * @return the GC information related to the |
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176 * last garbage collection |
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177 */ |
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178 public GcInfo getGcInfo() { |
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179 return gcInfo; |
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180 } |
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181 |
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182 /** |
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183 * Returns a {@code GarbageCollectionNotificationInfo} object represented by the |
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184 * given {@code CompositeData}. |
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185 * The given {@code CompositeData} must contain |
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186 * the following attributes: |
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187 * <blockquote> |
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188 * <table border> |
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189 * <tr> |
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190 * <th align=left>Attribute Name</th> |
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191 * <th align=left>Type</th> |
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192 * </tr> |
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193 * <tr> |
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194 * <td>gcName</td> |
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195 * <td>{@code java.lang.String}</td> |
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196 * </tr> |
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197 * <tr> |
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198 * <td>gcAction</td> |
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199 * <td>{@code java.lang.String}</td> |
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200 * </tr> |
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201 * <tr> |
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202 * <td>gcCause</td> |
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203 * <td>{@code java.lang.String}</td> |
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204 * </tr> |
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205 * <tr> |
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206 * <td>gcInfo</td> |
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207 * <td>{@code javax.management.openmbean.CompositeData}</td> |
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208 * </tr> |
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209 * </table> |
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210 * </blockquote> |
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211 * |
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212 * @param cd {@code CompositeData} representing a |
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213 * {@code GarbageCollectionNotificationInfo} |
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214 * |
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215 * @throws IllegalArgumentException if {@code cd} does not |
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216 * represent a {@code GarbaageCollectionNotificationInfo} object. |
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217 * |
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218 * @return a {@code GarbageCollectionNotificationInfo} object represented |
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219 * by {@code cd} if {@code cd} is not {@code null}; |
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220 * {@code null} otherwise. |
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221 */ |
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222 public static GarbageCollectionNotificationInfo from(CompositeData cd) { |
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223 if (cd == null) { |
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224 return null; |
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225 } |
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226 |
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227 if (cd instanceof GarbageCollectionNotifInfoCompositeData) { |
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228 return ((GarbageCollectionNotifInfoCompositeData) cd).getGarbageCollectionNotifInfo(); |
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229 } else { |
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230 return new GarbageCollectionNotificationInfo(cd); |
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231 } |
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232 } |
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233 |
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234 public CompositeData toCompositeData(CompositeType ct) { |
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235 return cdata; |
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236 } |
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237 |
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238 } |
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