J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2002-2006 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 | package com.sun.jmx.mbeanserver; |
| 26 | |
| 27 | import java.util.logging.Level; |
| 28 | |
| 29 | import javax.management.Attribute; |
| 30 | import javax.management.AttributeList; |
| 31 | import javax.management.AttributeNotFoundException; |
| 32 | import javax.management.DynamicMBean; |
| 33 | import javax.management.InvalidAttributeValueException; |
| 34 | import javax.management.JMRuntimeException; |
| 35 | import javax.management.MBeanAttributeInfo; |
| 36 | import javax.management.MBeanException; |
| 37 | import javax.management.MBeanInfo; |
| 38 | import javax.management.MBeanRegistration; |
| 39 | import javax.management.MBeanServer; |
| 40 | import javax.management.MBeanServerDelegate; |
| 41 | import javax.management.ObjectName; |
| 42 | import javax.management.ReflectionException; |
| 43 | import javax.management.RuntimeOperationsException; |
| 44 | |
| 45 | import static com.sun.jmx.defaults.JmxProperties.MBEANSERVER_LOGGER; |
| 46 | |
| 47 | /** |
| 48 | * This class is the MBean implementation of the MBeanServerDelegate. |
| 49 | * |
| 50 | * @since 1.5 |
| 51 | */ |
| 52 | final class MBeanServerDelegateImpl |
| 53 | extends MBeanServerDelegate |
| 54 | implements DynamicMBean, MBeanRegistration { |
| 55 | |
| 56 | final private static String[] attributeNames = new String[] { |
| 57 | "MBeanServerId", |
| 58 | "SpecificationName", |
| 59 | "SpecificationVersion", |
| 60 | "SpecificationVendor", |
| 61 | "ImplementationName", |
| 62 | "ImplementationVersion", |
| 63 | "ImplementationVendor" |
| 64 | }; |
| 65 | |
| 66 | private static final MBeanAttributeInfo[] attributeInfos = |
| 67 | new MBeanAttributeInfo[] { |
| 68 | new MBeanAttributeInfo("MBeanServerId","java.lang.String", |
| 69 | "The MBean server agent identification", |
| 70 | true,false,false), |
| 71 | new MBeanAttributeInfo("SpecificationName","java.lang.String", |
| 72 | "The full name of the JMX specification "+ |
| 73 | "implemented by this product.", |
| 74 | true,false,false), |
| 75 | new MBeanAttributeInfo("SpecificationVersion","java.lang.String", |
| 76 | "The version of the JMX specification "+ |
| 77 | "implemented by this product.", |
| 78 | true,false,false), |
| 79 | new MBeanAttributeInfo("SpecificationVendor","java.lang.String", |
| 80 | "The vendor of the JMX specification "+ |
| 81 | "implemented by this product.", |
| 82 | true,false,false), |
| 83 | new MBeanAttributeInfo("ImplementationName","java.lang.String", |
| 84 | "The JMX implementation name "+ |
| 85 | "(the name of this product)", |
| 86 | true,false,false), |
| 87 | new MBeanAttributeInfo("ImplementationVersion","java.lang.String", |
| 88 | "The JMX implementation version "+ |
| 89 | "(the version of this product).", |
| 90 | true,false,false), |
| 91 | new MBeanAttributeInfo("ImplementationVendor","java.lang.String", |
| 92 | "the JMX implementation vendor "+ |
| 93 | "(the vendor of this product).", |
| 94 | true,false,false) |
| 95 | }; |
| 96 | |
| 97 | private final MBeanInfo delegateInfo; |
| 98 | |
| 99 | public MBeanServerDelegateImpl () { |
| 100 | super(); |
| 101 | delegateInfo = |
| 102 | new MBeanInfo("javax.management.MBeanServerDelegate", |
| 103 | "Represents the MBean server from the management "+ |
| 104 | "point of view.", |
| 105 | MBeanServerDelegateImpl.attributeInfos, null, |
| 106 | null,getNotificationInfo()); |
| 107 | } |
| 108 | |
| 109 | final public ObjectName preRegister (MBeanServer server, ObjectName name) |
| 110 | throws java.lang.Exception { |
| 111 | if (name == null) return DELEGATE_NAME; |
| 112 | else return name; |
| 113 | } |
| 114 | |
| 115 | final public void postRegister (Boolean registrationDone) { |
| 116 | } |
| 117 | |
| 118 | final public void preDeregister() |
| 119 | throws java.lang.Exception { |
| 120 | throw new IllegalArgumentException( |
| 121 | "The MBeanServerDelegate MBean cannot be unregistered"); |
| 122 | } |
| 123 | |
| 124 | final public void postDeregister() { |
| 125 | } |
| 126 | |
| 127 | /** |
| 128 | * Obtains the value of a specific attribute of the MBeanServerDelegate. |
| 129 | * |
| 130 | * @param attribute The name of the attribute to be retrieved |
| 131 | * |
| 132 | * @return The value of the attribute retrieved. |
| 133 | * |
| 134 | * @exception AttributeNotFoundException |
| 135 | * @exception MBeanException |
| 136 | * Wraps a <CODE>java.lang.Exception</CODE> thrown by the |
| 137 | * MBean's getter. |
| 138 | */ |
| 139 | public Object getAttribute(String attribute) |
| 140 | throws AttributeNotFoundException, |
| 141 | MBeanException, ReflectionException { |
| 142 | try { |
| 143 | // attribute must not be null |
| 144 | // |
| 145 | if (attribute == null) |
| 146 | throw new AttributeNotFoundException("null"); |
| 147 | |
| 148 | // Extract the requested attribute from file |
| 149 | // |
| 150 | if (attribute.equals("MBeanServerId")) |
| 151 | return getMBeanServerId(); |
| 152 | else if (attribute.equals("SpecificationName")) |
| 153 | return getSpecificationName(); |
| 154 | else if (attribute.equals("SpecificationVersion")) |
| 155 | return getSpecificationVersion(); |
| 156 | else if (attribute.equals("SpecificationVendor")) |
| 157 | return getSpecificationVendor(); |
| 158 | else if (attribute.equals("ImplementationName")) |
| 159 | return getImplementationName(); |
| 160 | else if (attribute.equals("ImplementationVersion")) |
| 161 | return getImplementationVersion(); |
| 162 | else if (attribute.equals("ImplementationVendor")) |
| 163 | return getImplementationVendor(); |
| 164 | |
| 165 | // Unknown attribute |
| 166 | // |
| 167 | else |
| 168 | throw new AttributeNotFoundException("null"); |
| 169 | |
| 170 | } catch (AttributeNotFoundException x) { |
| 171 | throw x; |
| 172 | } catch (JMRuntimeException j) { |
| 173 | throw j; |
| 174 | } catch (SecurityException s) { |
| 175 | throw s; |
| 176 | } catch (Exception x) { |
| 177 | throw new MBeanException(x,"Failed to get " + attribute); |
| 178 | } |
| 179 | } |
| 180 | |
| 181 | /** |
| 182 | * This method always fail since all MBeanServerDelegateMBean attributes |
| 183 | * are read-only. |
| 184 | * |
| 185 | * @param attribute The identification of the attribute to |
| 186 | * be set and the value it is to be set to. |
| 187 | * |
| 188 | * @exception AttributeNotFoundException |
| 189 | */ |
| 190 | public void setAttribute(Attribute attribute) |
| 191 | throws AttributeNotFoundException, InvalidAttributeValueException, |
| 192 | MBeanException, ReflectionException { |
| 193 | |
| 194 | // Now we will always fail: |
| 195 | // Either because the attribute is null or because it is not |
| 196 | // accessible (or does not exist). |
| 197 | // |
| 198 | final String attname = (attribute==null?null:attribute.getName()); |
| 199 | if (attname == null) { |
| 200 | final RuntimeException r = |
| 201 | new IllegalArgumentException("Attribute name cannot be null"); |
| 202 | throw new RuntimeOperationsException(r, |
| 203 | "Exception occurred trying to invoke the setter on the MBean"); |
| 204 | } |
| 205 | |
| 206 | // This is a hack: we call getAttribute in order to generate an |
| 207 | // AttributeNotFoundException if the attribute does not exist. |
| 208 | // |
| 209 | Object val = getAttribute(attname); |
| 210 | |
| 211 | // If we reach this point, we know that the requested attribute |
| 212 | // exists. However, since all attributes are read-only, we throw |
| 213 | // an AttributeNotFoundException. |
| 214 | // |
| 215 | throw new AttributeNotFoundException(attname + " not accessible"); |
| 216 | } |
| 217 | |
| 218 | /** |
| 219 | * Makes it possible to get the values of several attributes of |
| 220 | * the MBeanServerDelegate. |
| 221 | * |
| 222 | * @param attributes A list of the attributes to be retrieved. |
| 223 | * |
| 224 | * @return The list of attributes retrieved. |
| 225 | * |
| 226 | */ |
| 227 | public AttributeList getAttributes(String[] attributes) { |
| 228 | // If attributes is null, the get all attributes. |
| 229 | // |
| 230 | final String[] attn = (attributes==null?attributeNames:attributes); |
| 231 | |
| 232 | // Prepare the result list. |
| 233 | // |
| 234 | final int len = attn.length; |
| 235 | final AttributeList list = new AttributeList(len); |
| 236 | |
| 237 | // Get each requested attribute. |
| 238 | // |
| 239 | for (int i=0;i<len;i++) { |
| 240 | try { |
| 241 | final Attribute a = |
| 242 | new Attribute(attn[i],getAttribute(attn[i])); |
| 243 | list.add(a); |
| 244 | } catch (Exception x) { |
| 245 | // Skip the attribute that couldn't be obtained. |
| 246 | // |
| 247 | if (MBEANSERVER_LOGGER.isLoggable(Level.FINEST)) { |
| 248 | MBEANSERVER_LOGGER.logp(Level.FINEST, |
| 249 | MBeanServerDelegateImpl.class.getName(), |
| 250 | "getAttributes", |
| 251 | "Attribute " + attn[i] + " not found"); |
| 252 | } |
| 253 | } |
| 254 | } |
| 255 | |
| 256 | // Finally return the result. |
| 257 | // |
| 258 | return list; |
| 259 | } |
| 260 | |
| 261 | /** |
| 262 | * This method always return an empty list since all |
| 263 | * MBeanServerDelegateMBean attributes are read-only. |
| 264 | * |
| 265 | * @param attributes A list of attributes: The identification of the |
| 266 | * attributes to be set and the values they are to be set to. |
| 267 | * |
| 268 | * @return The list of attributes that were set, with their new values. |
| 269 | * In fact, this method always return an empty list since all |
| 270 | * MBeanServerDelegateMBean attributes are read-only. |
| 271 | */ |
| 272 | public AttributeList setAttributes(AttributeList attributes) { |
| 273 | return new AttributeList(0); |
| 274 | } |
| 275 | |
| 276 | /** |
| 277 | * Always fails since the MBeanServerDelegate MBean has no operation. |
| 278 | * |
| 279 | * @param actionName The name of the action to be invoked. |
| 280 | * @param params An array containing the parameters to be set when the |
| 281 | * action is invoked. |
| 282 | * @param signature An array containing the signature of the action. |
| 283 | * |
| 284 | * @return The object returned by the action, which represents |
| 285 | * the result of invoking the action on the MBean specified. |
| 286 | * |
| 287 | * @exception MBeanException Wraps a <CODE>java.lang.Exception</CODE> |
| 288 | * thrown by the MBean's invoked method. |
| 289 | * @exception ReflectionException Wraps a |
| 290 | * <CODE>java.lang.Exception</CODE> thrown while trying to invoke |
| 291 | * the method. |
| 292 | */ |
| 293 | public Object invoke(String actionName, Object params[], |
| 294 | String signature[]) |
| 295 | throws MBeanException, ReflectionException { |
| 296 | // Check that operation name is not null. |
| 297 | // |
| 298 | if (actionName == null) { |
| 299 | final RuntimeException r = |
| 300 | new IllegalArgumentException("Operation name cannot be null"); |
| 301 | throw new RuntimeOperationsException(r, |
| 302 | "Exception occurred trying to invoke the operation on the MBean"); |
| 303 | } |
| 304 | |
| 305 | throw new ReflectionException( |
| 306 | new NoSuchMethodException(actionName), |
| 307 | "The operation with name " + actionName + |
| 308 | " could not be found"); |
| 309 | } |
| 310 | |
| 311 | /** |
| 312 | * Provides the MBeanInfo describing the MBeanServerDelegate. |
| 313 | * |
| 314 | * @return The MBeanInfo describing the MBeanServerDelegate. |
| 315 | * |
| 316 | */ |
| 317 | public MBeanInfo getMBeanInfo() { |
| 318 | return delegateInfo; |
| 319 | } |
| 320 | |
| 321 | } |