1 /* |
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2 * Copyright 2008 Sun Microsystems, Inc. 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. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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20 * CA 95054 USA or visit www.sun.com if you need additional information or |
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21 * have any questions. |
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22 */ |
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23 |
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24 import java.util.Random; |
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25 import java.util.Set; |
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26 import javax.management.AttributeChangeNotification; |
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27 import javax.management.ListenerNotFoundException; |
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28 import javax.management.MBeanAttributeInfo; |
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29 import javax.management.MBeanInfo; |
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30 import javax.management.MBeanNotificationInfo; |
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31 import javax.management.MBeanOperationInfo; |
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32 import javax.management.MBeanParameterInfo; |
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33 import javax.management.MBeanRegistration; |
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34 import javax.management.MBeanServer; |
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35 import javax.management.NotCompliantMBeanException; |
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36 import javax.management.NotificationBroadcasterSupport; |
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37 import javax.management.NotificationEmitter; |
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38 import javax.management.NotificationFilter; |
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39 import javax.management.NotificationListener; |
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40 import javax.management.ObjectName; |
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41 import javax.management.StandardMBean; |
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42 |
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43 |
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44 /** |
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45 * Dynamic MBean based on StandardMBean |
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46 * Class Wombat |
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47 * Wombat Description |
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48 * @author dfuchs |
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49 */ |
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50 public class Wombat extends StandardMBean |
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51 implements WombatMBean, NotificationEmitter, MBeanRegistration { |
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52 |
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53 /** |
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54 * Attribute : Caption |
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55 */ |
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56 private String caption = "I'm a wombat"; |
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57 |
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58 private final long MAX_SEED = 36000; |
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59 private final long seed; |
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60 private final long period; |
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61 private volatile int mood = 0; |
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62 |
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63 public int getMood() { |
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64 final long degree = seed + (System.currentTimeMillis()/period)%MAX_SEED; |
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65 final double angle = ((double)degree)/100; |
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66 mood = (int)(100.0*Math.sin(angle)); |
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67 return mood; |
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68 } |
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69 |
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70 public Wombat() throws NotCompliantMBeanException { |
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71 this(WombatMBean.class); |
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72 } |
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73 |
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74 public Wombat(Class<? extends WombatMBean> clazz) |
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75 throws NotCompliantMBeanException { |
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76 super(clazz); |
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77 final Random r = new Random(); |
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78 seed = ((r.nextLong() % MAX_SEED) + MAX_SEED)%MAX_SEED; |
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79 period = 200 + (((r.nextLong()%80)+80)%80)*10; |
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80 } |
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81 |
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82 /** |
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83 * Next are the methods to compute MBeanInfo. |
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84 * You shouldn't update these methods. |
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85 */ |
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86 @Override |
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87 protected String getDescription(MBeanInfo info) { |
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88 return "Wombats are strange beasts. You will find them down under " + |
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89 "and in some computer programms."; |
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90 } |
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91 |
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92 @Override |
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93 protected String getDescription(MBeanAttributeInfo info) { |
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94 String description = null; |
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95 if (info.getName().equals("Caption")) { |
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96 description = "A simple caption to describe a wombat"; |
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97 } |
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98 if (info.getName().equals("Mood")) { |
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99 description = "This Wombat's mood on a [-100,+100] scale."+ |
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100 " -100 means that this wombat is very angry."; |
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101 } |
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102 return description; |
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103 } |
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104 |
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105 @Override |
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106 protected String getDescription(MBeanOperationInfo op, |
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107 MBeanParameterInfo param, |
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108 int sequence) { |
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109 return null; |
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110 } |
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111 |
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112 @Override |
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113 protected String getParameterName(MBeanOperationInfo op, |
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114 MBeanParameterInfo param, |
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115 int sequence) { |
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116 return null; |
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117 } |
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118 |
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119 @Override |
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120 protected String getDescription(MBeanOperationInfo info) { |
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121 String description = null; |
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122 return description; |
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123 } |
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124 |
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125 @Override |
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126 public MBeanInfo getMBeanInfo() { |
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127 MBeanInfo mbinfo = super.getMBeanInfo(); |
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128 return new MBeanInfo(mbinfo.getClassName(), |
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129 mbinfo.getDescription(), |
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130 mbinfo.getAttributes(), |
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131 mbinfo.getConstructors(), |
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132 mbinfo.getOperations(), |
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133 getNotificationInfo()); |
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134 } |
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135 |
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136 /** |
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137 * Get A simple caption to describe a wombat |
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138 */ |
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139 public synchronized String getCaption() { |
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140 return caption; |
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141 } |
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142 |
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143 /** |
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144 * Set A simple caption to describe a wombat |
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145 */ |
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146 public void setCaption(String value) { |
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147 final String oldValue; |
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148 synchronized (this) { |
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149 oldValue = caption; |
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150 caption = value; |
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151 } |
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152 final AttributeChangeNotification notif = |
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153 new AttributeChangeNotification(objectName, |
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154 getNextSeqNumber(), |
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155 System.currentTimeMillis(), |
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156 "Caption changed","Caption", |
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157 String.class.getName(),oldValue,value); |
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158 broadcaster.sendNotification(notif); |
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159 } |
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160 |
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161 /** |
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162 * MBeanNotification support |
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163 * You shouldn't update these methods |
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164 */ |
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165 public void addNotificationListener(NotificationListener listener, NotificationFilter filter, Object handback) throws IllegalArgumentException { |
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166 broadcaster.addNotificationListener(listener, filter, handback); |
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167 } |
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168 |
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169 public MBeanNotificationInfo[] getNotificationInfo() { |
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170 return new MBeanNotificationInfo[] { |
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171 new MBeanNotificationInfo(new String[] { |
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172 AttributeChangeNotification.ATTRIBUTE_CHANGE}, |
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173 javax.management.AttributeChangeNotification.class.getName(), |
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174 "Sent when the caption changes") |
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175 }; |
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176 } |
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177 |
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178 public void removeNotificationListener(NotificationListener listener) throws ListenerNotFoundException { |
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179 broadcaster.removeNotificationListener(listener); |
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180 } |
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181 |
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182 public void removeNotificationListener(NotificationListener listener, NotificationFilter filter, Object handback) throws ListenerNotFoundException { |
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183 broadcaster.removeNotificationListener(listener, filter, handback); |
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184 } |
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185 |
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186 private synchronized long getNextSeqNumber() { |
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187 return seqNumber++; |
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188 } |
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189 |
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190 private long seqNumber; |
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191 |
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192 private final NotificationBroadcasterSupport broadcaster = new NotificationBroadcasterSupport(); |
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193 |
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194 /** |
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195 * Allows the MBean to perform any operations it needs before being |
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196 * registered in the MBean server. If the name of the MBean is not |
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197 * specified, the MBean can provide a name for its registration. If |
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198 * any exception is raised, the MBean will not be registered in the |
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199 * MBean server. |
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200 * @param server The MBean server in which the MBean will be registered. |
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201 * @param name The object name of the MBean. This name is null if the |
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202 * name parameter to one of the createMBean or registerMBean methods in |
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203 * the MBeanServer interface is null. In that case, this method must |
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204 * return a non-null ObjectName for the new MBean. |
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205 * @return The name under which the MBean is to be registered. This value |
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206 * must not be null. If the name parameter is not null, it will usually |
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207 * but not necessarily be the returned value. |
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208 * @throws Exception This exception will be caught by the MBean server and |
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209 * re-thrown as an MBeanRegistrationException. |
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210 */ |
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211 @Override |
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212 public ObjectName preRegister(MBeanServer server, ObjectName name) |
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213 throws Exception { |
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214 objectName = name; |
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215 mbeanServer = server; |
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216 return super.preRegister(server, name); |
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217 } |
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218 |
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219 /** |
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220 * Allows the MBean to perform any operations needed after having |
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221 * been registered in the MBean server or after the registration has |
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222 * failed. |
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223 * @param registrationDone Indicates wether or not the MBean has been |
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224 * successfully registered in the MBean server. The value false means |
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225 * that the registration has failed. |
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226 */ |
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227 @Override |
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228 public void postRegister(Boolean registrationDone) { |
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229 super.postRegister(registrationDone); |
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230 } |
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231 |
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232 /** |
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233 * Allows the MBean to perform any operations it needs before being |
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234 * unregistered by the MBean server. |
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235 * @throws Exception This exception will be caught by the MBean server and |
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236 * re-thrown as an MBeanRegistrationException. |
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237 */ |
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238 @Override |
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239 public void preDeregister() throws Exception { |
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240 super.preDeregister(); |
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241 } |
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242 |
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243 /** |
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244 * Allows the MBean to perform any operations needed after having been |
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245 * unregistered in the MBean server. |
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246 */ |
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247 @Override |
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248 public void postDeregister() { |
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249 super.postDeregister(); |
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250 } |
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251 |
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252 public Set<ObjectName> listMatching(ObjectName pattern) { |
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253 return mbeanServer.queryNames(pattern, null); |
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254 } |
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255 |
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256 private MBeanServer mbeanServer; |
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257 |
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258 private ObjectName objectName; |
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259 } |
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