J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2003-2007 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.remote; |
| 27 | |
| 28 | |
| 29 | import com.sun.jmx.remote.util.ClassLogger; |
| 30 | import com.sun.jmx.remote.util.EnvHelp; |
| 31 | |
| 32 | import java.io.IOException; |
| 33 | import java.net.MalformedURLException; |
| 34 | import java.util.Collections; |
| 35 | import java.util.HashMap; |
| 36 | import java.util.Iterator; |
| 37 | import java.util.Map; |
| 38 | import java.util.ServiceLoader; |
| 39 | |
| 40 | import javax.management.MBeanServer; |
| 41 | import javax.management.ObjectName; |
| 42 | |
| 43 | /** |
| 44 | * <p>Factory to create JMX API connector servers. There |
| 45 | * are no instances of this class.</p> |
| 46 | * |
| 47 | * <p>Each connector server is created by an instance of {@link |
| 48 | * JMXConnectorServerProvider}. This instance is found as follows. Suppose |
| 49 | * the given {@link JMXServiceURL} looks like |
| 50 | * <code>"service:jmx:<em>protocol</em>:<em>remainder</em>"</code>. |
| 51 | * Then the factory will attempt to find the appropriate {@link |
| 52 | * JMXConnectorServerProvider} for <code><em>protocol</em></code>. Each |
| 53 | * occurrence of the character <code>+</code> or <code>-</code> in |
| 54 | * <code><em>protocol</em></code> is replaced by <code>.</code> or |
| 55 | * <code>_</code>, respectively.</p> |
| 56 | * |
| 57 | * <p>A <em>provider package list</em> is searched for as follows:</p> |
| 58 | * |
| 59 | * <ol> |
| 60 | * |
| 61 | * <li>If the <code>environment</code> parameter to {@link |
| 62 | * #newJMXConnectorServer(JMXServiceURL,Map,MBeanServer) |
| 63 | * newJMXConnectorServer} contains the key |
| 64 | * <code>jmx.remote.protocol.provider.pkgs</code> then the associated |
| 65 | * value is the provider package list. |
| 66 | * |
| 67 | * <li>Otherwise, if the system property |
| 68 | * <code>jmx.remote.protocol.provider.pkgs</code> exists, then its value |
| 69 | * is the provider package list. |
| 70 | * |
| 71 | * <li>Otherwise, there is no provider package list. |
| 72 | * |
| 73 | * </ol> |
| 74 | * |
| 75 | * <p>The provider package list is a string that is interpreted as a |
| 76 | * list of non-empty Java package names separated by vertical bars |
| 77 | * (<code>|</code>). If the string is empty, then so is the provider |
| 78 | * package list. If the provider package list is not a String, or if |
| 79 | * it contains an element that is an empty string, a {@link |
| 80 | * JMXProviderException} is thrown.</p> |
| 81 | * |
| 82 | * <p>If the provider package list exists and is not empty, then for |
| 83 | * each element <code><em>pkg</em></code> of the list, the factory |
| 84 | * will attempt to load the class |
| 85 | * |
| 86 | * <blockquote> |
| 87 | * <code><em>pkg</em>.<em>protocol</em>.ServerProvider</code> |
| 88 | * </blockquote> |
| 89 | |
| 90 | * <p>If the <code>environment</code> parameter to {@link |
| 91 | * #newJMXConnectorServer(JMXServiceURL, Map, MBeanServer) |
| 92 | * newJMXConnectorServer} contains the key |
| 93 | * <code>jmx.remote.protocol.provider.class.loader</code> then the |
| 94 | * associated value is the class loader to use to load the provider. |
| 95 | * If the associated value is not an instance of {@link |
| 96 | * java.lang.ClassLoader}, an {@link |
| 97 | * java.lang.IllegalArgumentException} is thrown.</p> |
| 98 | * |
| 99 | * <p>If the <code>jmx.remote.protocol.provider.class.loader</code> |
| 100 | * key is not present in the <code>environment</code> parameter, the |
| 101 | * calling thread's context class loader is used.</p> |
| 102 | * |
| 103 | * <p>If the attempt to load this class produces a {@link |
| 104 | * ClassNotFoundException}, the search for a handler continues with |
| 105 | * the next element of the list.</p> |
| 106 | * |
| 107 | * <p>Otherwise, a problem with the provider found is signalled by a |
| 108 | * {@link JMXProviderException} whose {@link |
| 109 | * JMXProviderException#getCause() <em>cause</em>} indicates the |
| 110 | * underlying exception, as follows:</p> |
| 111 | * |
| 112 | * <ul> |
| 113 | * |
| 114 | * <li>if the attempt to load the class produces an exception other |
| 115 | * than <code>ClassNotFoundException</code>, that is the |
| 116 | * <em>cause</em>; |
| 117 | * |
| 118 | * <li>if {@link Class#newInstance()} for the class produces an |
| 119 | * exception, that is the <em>cause</em>. |
| 120 | * |
| 121 | * </ul> |
| 122 | * |
| 123 | * <p>If no provider is found by the above steps, including the |
| 124 | * default case where there is no provider package list, then the |
| 125 | * implementation will use its own provider for |
| 126 | * <code><em>protocol</em></code>, or it will throw a |
| 127 | * <code>MalformedURLException</code> if there is none. An |
| 128 | * implementation may choose to find providers by other means. For |
| 129 | * example, it may support the <a |
| 130 | * href="{@docRoot}/../technotes/guides/jar/jar.html#Service Provider"> |
| 131 | * JAR conventions for service providers</a>, where the service |
| 132 | * interface is <code>JMXConnectorServerProvider</code>.</p> |
| 133 | * |
| 134 | * <p>Every implementation must support the RMI connector protocols, |
| 135 | * specified with the string <code>rmi</code> or |
| 136 | * <code>iiop</code>.</p> |
| 137 | * |
| 138 | * <p>Once a provider is found, the result of the |
| 139 | * <code>newJMXConnectorServer</code> method is the result of calling |
| 140 | * {@link |
| 141 | * JMXConnectorServerProvider#newJMXConnectorServer(JMXServiceURL, |
| 142 | * Map, MBeanServer) newJMXConnectorServer} on the provider.</p> |
| 143 | * |
| 144 | * <p>The <code>Map</code> parameter passed to the |
| 145 | * <code>JMXConnectorServerProvider</code> is a new read-only |
| 146 | * <code>Map</code> that contains all the entries that were in the |
| 147 | * <code>environment</code> parameter to {@link |
| 148 | * #newJMXConnectorServer(JMXServiceURL,Map,MBeanServer) |
| 149 | * JMXConnectorServerFactory.newJMXConnectorServer}, if there was one. |
| 150 | * Additionally, if the |
| 151 | * <code>jmx.remote.protocol.provider.class.loader</code> key is not |
| 152 | * present in the <code>environment</code> parameter, it is added to |
| 153 | * the new read-only <code>Map</code>. The associated value is the |
| 154 | * calling thread's context class loader.</p> |
| 155 | * |
| 156 | * @since 1.5 |
| 157 | */ |
| 158 | public class JMXConnectorServerFactory { |
| 159 | |
| 160 | /** |
| 161 | * <p>Name of the attribute that specifies the default class |
| 162 | * loader. This class loader is used to deserialize objects in |
| 163 | * requests received from the client, possibly after consulting an |
| 164 | * MBean-specific class loader. The value associated with this |
| 165 | * attribute is an instance of {@link ClassLoader}.</p> |
| 166 | */ |
| 167 | public static final String DEFAULT_CLASS_LOADER = |
| 168 | JMXConnectorFactory.DEFAULT_CLASS_LOADER; |
| 169 | |
| 170 | /** |
| 171 | * <p>Name of the attribute that specifies the default class |
| 172 | * loader MBean name. This class loader is used to deserialize objects in |
| 173 | * requests received from the client, possibly after consulting an |
| 174 | * MBean-specific class loader. The value associated with this |
| 175 | * attribute is an instance of {@link ObjectName}.</p> |
| 176 | */ |
| 177 | public static final String DEFAULT_CLASS_LOADER_NAME = |
| 178 | "jmx.remote.default.class.loader.name"; |
| 179 | |
| 180 | /** |
| 181 | * <p>Name of the attribute that specifies the provider packages |
| 182 | * that are consulted when looking for the handler for a protocol. |
| 183 | * The value associated with this attribute is a string with |
| 184 | * package names separated by vertical bars (<code>|</code>).</p> |
| 185 | */ |
| 186 | public static final String PROTOCOL_PROVIDER_PACKAGES = |
| 187 | "jmx.remote.protocol.provider.pkgs"; |
| 188 | |
| 189 | /** |
| 190 | * <p>Name of the attribute that specifies the class |
| 191 | * loader for loading protocol providers. |
| 192 | * The value associated with this attribute is an instance |
| 193 | * of {@link ClassLoader}.</p> |
| 194 | */ |
| 195 | public static final String PROTOCOL_PROVIDER_CLASS_LOADER = |
| 196 | "jmx.remote.protocol.provider.class.loader"; |
| 197 | |
| 198 | private static final String PROTOCOL_PROVIDER_DEFAULT_PACKAGE = |
| 199 | "com.sun.jmx.remote.protocol"; |
| 200 | |
| 201 | private static final ClassLogger logger = |
| 202 | new ClassLogger("javax.management.remote.misc","JMXConnectorServerFactory"); |
| 203 | |
| 204 | /** There are no instances of this class. */ |
| 205 | private JMXConnectorServerFactory() { |
| 206 | } |
| 207 | |
| 208 | private static JMXConnectorServer |
| 209 | getConnectorServerAsService(ClassLoader loader, |
| 210 | JMXServiceURL url, |
| 211 | Map<String, ?> map, |
| 212 | MBeanServer mbs) |
| 213 | throws IOException { |
| 214 | Iterator<JMXConnectorServerProvider> providers = |
| 215 | JMXConnectorFactory. |
| 216 | getProviderIterator(JMXConnectorServerProvider.class, loader); |
| 217 | |
| 218 | JMXConnectorServer connection = null; |
| 219 | IOException exception = null; |
| 220 | while (providers.hasNext()) { |
| 221 | try { |
| 222 | connection = providers.next().newJMXConnectorServer(url, map, mbs); |
| 223 | return connection; |
| 224 | } catch (JMXProviderException e) { |
| 225 | throw e; |
| 226 | } catch (Exception e) { |
| 227 | if (logger.traceOn()) |
| 228 | logger.trace("getConnectorAsService", |
| 229 | "URL[" + url + |
| 230 | "] Service provider exception: " + e); |
| 231 | if (!(e instanceof MalformedURLException)) { |
| 232 | if (exception == null) { |
| 233 | if (exception instanceof IOException) { |
| 234 | exception = (IOException) e; |
| 235 | } else { |
| 236 | exception = EnvHelp.initCause( |
| 237 | new IOException(e.getMessage()), e); |
| 238 | } |
| 239 | } |
| 240 | } |
| 241 | continue; |
| 242 | } |
| 243 | } |
| 244 | if (exception == null) |
| 245 | return null; |
| 246 | else |
| 247 | throw exception; |
| 248 | } |
| 249 | |
| 250 | /** |
| 251 | * <p>Creates a connector server at the given address. The |
| 252 | * resultant server is not started until its {@link |
| 253 | * JMXConnectorServer#start() start} method is called.</p> |
| 254 | * |
| 255 | * @param serviceURL the address of the new connector server. The |
| 256 | * actual address of the new connector server, as returned by its |
| 257 | * {@link JMXConnectorServer#getAddress() getAddress} method, will |
| 258 | * not necessarily be exactly the same. For example, it might |
| 259 | * include a port number if the original address did not. |
| 260 | * |
| 261 | * @param environment a set of attributes to control the new |
| 262 | * connector server's behavior. This parameter can be null. |
| 263 | * Keys in this map must be Strings. The appropriate type of each |
| 264 | * associated value depends on the attribute. The contents of |
| 265 | * <code>environment</code> are not changed by this call. |
| 266 | * |
| 267 | * @param mbeanServer the MBean server that this connector server |
| 268 | * is attached to. Null if this connector server will be attached |
| 269 | * to an MBean server by being registered in it. |
| 270 | * |
| 271 | * @return a <code>JMXConnectorServer</code> representing the new |
| 272 | * connector server. Each successful call to this method produces |
| 273 | * a different object. |
| 274 | * |
| 275 | * @exception NullPointerException if <code>serviceURL</code> is null. |
| 276 | * |
| 277 | * @exception IOException if the connector server cannot be made |
| 278 | * because of a communication problem. |
| 279 | * |
| 280 | * @exception MalformedURLException if there is no provider for the |
| 281 | * protocol in <code>serviceURL</code>. |
| 282 | * |
| 283 | * @exception JMXProviderException if there is a provider for the |
| 284 | * protocol in <code>serviceURL</code> but it cannot be used for |
| 285 | * some reason. |
| 286 | */ |
| 287 | public static JMXConnectorServer |
| 288 | newJMXConnectorServer(JMXServiceURL serviceURL, |
| 289 | Map<String,?> environment, |
| 290 | MBeanServer mbeanServer) |
| 291 | throws IOException { |
| 292 | Map<String, Object> envcopy; |
| 293 | if (environment == null) |
| 294 | envcopy = new HashMap<String, Object>(); |
| 295 | else { |
| 296 | EnvHelp.checkAttributes(environment); |
| 297 | envcopy = new HashMap<String, Object>(environment); |
| 298 | } |
| 299 | |
| 300 | final Class<JMXConnectorServerProvider> targetInterface = |
| 301 | JMXConnectorServerProvider.class; |
| 302 | final ClassLoader loader = |
| 303 | JMXConnectorFactory.resolveClassLoader(envcopy); |
| 304 | final String protocol = serviceURL.getProtocol(); |
| 305 | final String providerClassName = "ServerProvider"; |
| 306 | |
| 307 | JMXConnectorServerProvider provider = |
| 308 | JMXConnectorFactory.getProvider(serviceURL, |
| 309 | envcopy, |
| 310 | providerClassName, |
| 311 | targetInterface, |
| 312 | loader); |
| 313 | |
| 314 | IOException exception = null; |
| 315 | if (provider == null) { |
| 316 | // Loader is null when context class loader is set to null |
| 317 | // and no loader has been provided in map. |
| 318 | // com.sun.jmx.remote.util.Service class extracted from j2se |
| 319 | // provider search algorithm doesn't handle well null classloader. |
| 320 | if (loader != null) { |
| 321 | try { |
| 322 | JMXConnectorServer connection = |
| 323 | getConnectorServerAsService(loader, |
| 324 | serviceURL, |
| 325 | envcopy, |
| 326 | mbeanServer); |
| 327 | if (connection != null) |
| 328 | return connection; |
| 329 | } catch (JMXProviderException e) { |
| 330 | throw e; |
| 331 | } catch (IOException e) { |
| 332 | exception = e; |
| 333 | } |
| 334 | } |
| 335 | provider = |
| 336 | JMXConnectorFactory.getProvider( |
| 337 | protocol, |
| 338 | PROTOCOL_PROVIDER_DEFAULT_PACKAGE, |
| 339 | JMXConnectorFactory.class.getClassLoader(), |
| 340 | providerClassName, |
| 341 | targetInterface); |
| 342 | } |
| 343 | |
| 344 | if (provider == null) { |
| 345 | MalformedURLException e = |
| 346 | new MalformedURLException("Unsupported protocol: " + protocol); |
| 347 | if (exception == null) { |
| 348 | throw e; |
| 349 | } else { |
| 350 | throw EnvHelp.initCause(e, exception); |
| 351 | } |
| 352 | } |
| 353 | |
| 354 | envcopy = Collections.unmodifiableMap(envcopy); |
| 355 | |
| 356 | return provider.newJMXConnectorServer(serviceURL, |
| 357 | envcopy, |
| 358 | mbeanServer); |
| 359 | } |
| 360 | } |