J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1999-2006 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package javax.management; |
| 27 | |
| 28 | import com.sun.jmx.defaults.ServiceName; |
| 29 | |
| 30 | /** |
| 31 | * Represents the MBean server from the management point of view. |
| 32 | * The MBeanServerDelegate MBean emits the MBeanServerNotifications when |
| 33 | * an MBean is registered/unregistered in the MBean server. |
| 34 | * |
| 35 | * @since 1.5 |
| 36 | */ |
| 37 | public class MBeanServerDelegate implements MBeanServerDelegateMBean, |
| 38 | NotificationEmitter { |
| 39 | |
| 40 | /** The MBean server agent identification.*/ |
| 41 | private String mbeanServerId ; |
| 42 | |
| 43 | /** The NotificationBroadcasterSupport object that sends the |
| 44 | notifications */ |
| 45 | private final NotificationBroadcasterSupport broadcaster; |
| 46 | |
| 47 | private static long oldStamp = 0; |
| 48 | private final long stamp; |
| 49 | private long sequenceNumber = 1; |
| 50 | |
| 51 | private static final MBeanNotificationInfo[] notifsInfo; |
| 52 | |
| 53 | static { |
| 54 | final String[] types = { |
| 55 | MBeanServerNotification.UNREGISTRATION_NOTIFICATION, |
| 56 | MBeanServerNotification.REGISTRATION_NOTIFICATION |
| 57 | }; |
| 58 | notifsInfo = new MBeanNotificationInfo[1]; |
| 59 | notifsInfo[0] = |
| 60 | new MBeanNotificationInfo(types, |
| 61 | "javax.management.MBeanServerNotification", |
| 62 | "Notifications sent by the MBeanServerDelegate MBean"); |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * Create a MBeanServerDelegate object. |
| 67 | */ |
| 68 | public MBeanServerDelegate () { |
| 69 | stamp = getStamp(); |
| 70 | broadcaster = new NotificationBroadcasterSupport() ; |
| 71 | } |
| 72 | |
| 73 | |
| 74 | /** |
| 75 | * Returns the MBean server agent identity. |
| 76 | * |
| 77 | * @return the identity. |
| 78 | */ |
| 79 | public synchronized String getMBeanServerId() { |
| 80 | if (mbeanServerId == null) { |
| 81 | String localHost; |
| 82 | try { |
| 83 | localHost = java.net.InetAddress.getLocalHost().getHostName(); |
| 84 | } catch (java.net.UnknownHostException e) { |
| 85 | localHost = "localhost"; |
| 86 | } |
| 87 | mbeanServerId = localHost + "_" + stamp; |
| 88 | } |
| 89 | return mbeanServerId; |
| 90 | } |
| 91 | |
| 92 | /** |
| 93 | * Returns the full name of the JMX specification implemented |
| 94 | * by this product. |
| 95 | * |
| 96 | * @return the specification name. |
| 97 | */ |
| 98 | public String getSpecificationName() { |
| 99 | return ServiceName.JMX_SPEC_NAME; |
| 100 | } |
| 101 | |
| 102 | /** |
| 103 | * Returns the version of the JMX specification implemented |
| 104 | * by this product. |
| 105 | * |
| 106 | * @return the specification version. |
| 107 | */ |
| 108 | public String getSpecificationVersion() { |
| 109 | return ServiceName.JMX_SPEC_VERSION; |
| 110 | } |
| 111 | |
| 112 | /** |
| 113 | * Returns the vendor of the JMX specification implemented |
| 114 | * by this product. |
| 115 | * |
| 116 | * @return the specification vendor. |
| 117 | */ |
| 118 | public String getSpecificationVendor() { |
| 119 | return ServiceName.JMX_SPEC_VENDOR; |
| 120 | } |
| 121 | |
| 122 | /** |
| 123 | * Returns the JMX implementation name (the name of this product). |
| 124 | * |
| 125 | * @return the implementation name. |
| 126 | */ |
| 127 | public String getImplementationName() { |
| 128 | return ServiceName.JMX_IMPL_NAME; |
| 129 | } |
| 130 | |
| 131 | /** |
| 132 | * Returns the JMX implementation version (the version of this product). |
| 133 | * |
| 134 | * @return the implementation version. |
| 135 | */ |
| 136 | public String getImplementationVersion() { |
| 137 | try { |
| 138 | return System.getProperty("java.runtime.version"); |
| 139 | } catch (SecurityException e) { |
| 140 | return ""; |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | /** |
| 145 | * Returns the JMX implementation vendor (the vendor of this product). |
| 146 | * |
| 147 | * @return the implementation vendor. |
| 148 | */ |
| 149 | public String getImplementationVendor() { |
| 150 | return ServiceName.JMX_IMPL_VENDOR; |
| 151 | } |
| 152 | |
| 153 | // From NotificationEmitter extends NotificationBroacaster |
| 154 | // |
| 155 | public MBeanNotificationInfo[] getNotificationInfo() { |
| 156 | final int len = MBeanServerDelegate.notifsInfo.length; |
| 157 | final MBeanNotificationInfo[] infos = |
| 158 | new MBeanNotificationInfo[len]; |
| 159 | System.arraycopy(MBeanServerDelegate.notifsInfo,0,infos,0,len); |
| 160 | return infos; |
| 161 | } |
| 162 | |
| 163 | // From NotificationEmitter extends NotificationBroacaster |
| 164 | // |
| 165 | public synchronized |
| 166 | void addNotificationListener(NotificationListener listener, |
| 167 | NotificationFilter filter, |
| 168 | Object handback) |
| 169 | throws IllegalArgumentException { |
| 170 | broadcaster.addNotificationListener(listener,filter,handback) ; |
| 171 | } |
| 172 | |
| 173 | // From NotificationEmitter extends NotificationBroacaster |
| 174 | // |
| 175 | public synchronized |
| 176 | void removeNotificationListener(NotificationListener listener, |
| 177 | NotificationFilter filter, |
| 178 | Object handback) |
| 179 | throws ListenerNotFoundException { |
| 180 | broadcaster.removeNotificationListener(listener,filter,handback) ; |
| 181 | } |
| 182 | |
| 183 | // From NotificationEmitter extends NotificationBroacaster |
| 184 | // |
| 185 | public synchronized |
| 186 | void removeNotificationListener(NotificationListener listener) |
| 187 | throws ListenerNotFoundException { |
| 188 | broadcaster.removeNotificationListener(listener) ; |
| 189 | } |
| 190 | |
| 191 | /** |
| 192 | * Enables the MBean server to send a notification. |
| 193 | * If the passed <var>notification</var> has a sequence number lesser |
| 194 | * or equal to 0, then replace it with the delegate's own sequence |
| 195 | * number. |
| 196 | * @param notification The notification to send. |
| 197 | * |
| 198 | */ |
| 199 | public void sendNotification(Notification notification) { |
| 200 | if (notification.getSequenceNumber() < 1) { |
| 201 | synchronized (this) { |
| 202 | notification.setSequenceNumber(this.sequenceNumber++); |
| 203 | } |
| 204 | } |
| 205 | broadcaster.sendNotification(notification); |
| 206 | } |
| 207 | |
| 208 | /** |
| 209 | * Defines the default ObjectName of the MBeanServerDelegate. |
| 210 | * |
| 211 | * @since 1.6 |
| 212 | */ |
| 213 | public static final ObjectName DELEGATE_NAME; |
| 214 | static { |
| 215 | try { |
| 216 | DELEGATE_NAME = |
| 217 | new ObjectName("JMImplementation:type=MBeanServerDelegate"); |
| 218 | } catch (MalformedObjectNameException e) { |
| 219 | throw new Error("Can't initialize delegate name", e); |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | /* Return a timestamp that is monotonically increasing even if |
| 224 | System.currentTimeMillis() isn't (for example, if you call this |
| 225 | constructor more than once in the same millisecond, or if the |
| 226 | clock always returns the same value). This means that the ids |
| 227 | for a given JVM will always be distinact, though there is no |
| 228 | such guarantee for two different JVMs. */ |
| 229 | private static synchronized long getStamp() { |
| 230 | long s = System.currentTimeMillis(); |
| 231 | if (oldStamp >= s) { |
| 232 | s = oldStamp + 1; |
| 233 | } |
| 234 | oldStamp = s; |
| 235 | return s; |
| 236 | } |
| 237 | } |