1 /*
2 * Copyright (c) 2003, 2017, Oracle and/or its affiliates. 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. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * 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.io.UncheckedIOException;
34 import java.net.MalformedURLException;
35 import java.util.Collections;
36 import java.util.HashMap;
37 import java.util.Map;
38 import java.util.ServiceLoader.Provider;
39 import java.util.function.Predicate;
40
41 import javax.management.MBeanServer;
42 import javax.management.remote.JMXConnectorFactory.ConnectorFactory;
43
44 /**
45 * <p>Factory to create JMX API connector servers. There
46 * are no instances of this class.</p>
47 *
48 * <p>Each connector server is created by an instance of {@link
49 * JMXConnectorServerProvider}. This instance is found as follows. Suppose
50 * the given {@link JMXServiceURL} looks like
51 * <code>"service:jmx:<em>protocol</em>:<em>remainder</em>"</code>.
52 * Then the factory will attempt to find the appropriate {@link
53 * JMXConnectorServerProvider} for <code><em>protocol</em></code>. Each
54 * occurrence of the character <code>+</code> or <code>-</code> in
55 * <code><em>protocol</em></code> is replaced by <code>.</code> or
56 * <code>_</code>, respectively.</p>
57 *
58 * <p>A <em>provider package list</em> is searched for as follows:</p>
59 *
60 * <ol>
61 *
62 * <li>If the <code>environment</code> parameter to {@link
63 * #newJMXConnectorServer(JMXServiceURL,Map,MBeanServer)
64 * newJMXConnectorServer} contains the key
65 * <code>jmx.remote.protocol.provider.pkgs</code> then the associated
66 * value is the provider package list.
67 *
68 * <li>Otherwise, if the system property
69 * <code>jmx.remote.protocol.provider.pkgs</code> exists, then its value
70 * is the provider package list.
71 *
72 * <li>Otherwise, there is no provider package list.
73 *
74 * </ol>
75 *
76 * <p>The provider package list is a string that is interpreted as a
77 * list of non-empty Java package names separated by vertical bars
78 * (<code>|</code>). If the string is empty, then so is the provider
79 * package list. If the provider package list is not a String, or if
80 * it contains an element that is an empty string, a {@link
81 * JMXProviderException} is thrown.</p>
82 *
83 * <p>If the provider package list exists and is not empty, then for
84 * each element <code><em>pkg</em></code> of the list, the factory
85 * will attempt to load the class
86 *
87 * <blockquote>
88 * <code><em>pkg</em>.<em>protocol</em>.ServerProvider</code>
89 * </blockquote>
90
91 * <p>If the <code>environment</code> parameter to {@link
92 * #newJMXConnectorServer(JMXServiceURL, Map, MBeanServer)
93 * newJMXConnectorServer} contains the key
94 * <code>jmx.remote.protocol.provider.class.loader</code> then the
95 * associated value is the class loader to use to load the provider.
96 * If the associated value is not an instance of {@link
97 * java.lang.ClassLoader}, an {@link
98 * java.lang.IllegalArgumentException} is thrown.</p>
99 *
100 * <p>If the <code>jmx.remote.protocol.provider.class.loader</code>
101 * key is not present in the <code>environment</code> parameter, the
102 * calling thread's context class loader is used.</p>
103 *
104 * <p>If the attempt to load this class produces a {@link
105 * ClassNotFoundException}, the search for a handler continues with
106 * the next element of the list.</p>
107 *
108 * <p>Otherwise, a problem with the provider found is signalled by a
109 * {@link JMXProviderException} whose {@link
110 * JMXProviderException#getCause() <em>cause</em>} indicates the
111 * underlying exception, as follows:</p>
112 *
113 * <ul>
114 *
115 * <li>if the attempt to load the class produces an exception other
116 * than <code>ClassNotFoundException</code>, that is the
117 * <em>cause</em>;
118 *
119 * <li>if {@link Class#newInstance()} for the class produces an
120 * exception, that is the <em>cause</em>.
121 *
122 * </ul>
123 *
124 * <p>If no provider is found by the above steps, including the
125 * default case where there is no provider package list, then the
126 * implementation will use its own provider for
127 * <code><em>protocol</em></code>, or it will throw a
128 * <code>MalformedURLException</code> if there is none. An
129 * implementation may choose to find providers by other means. For
130 * example, it may support <a
131 * href="{@docRoot}/java/util/ServiceLoader.html#developing-service-providers">service providers</a>,
132 * where the service interface is <code>JMXConnectorServerProvider</code>.</p>
133 *
134 * <p>Every implementation must support the RMI connector protocol with
135 * the default RMI transport, specified with string <code>rmi</code>.
136 * </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 javax.management.ObjectName
176 * ObjectName}.</p>
177 */
178 public static final String DEFAULT_CLASS_LOADER_NAME =
179 "jmx.remote.default.class.loader.name";
180
181 /**
182 * <p>Name of the attribute that specifies the provider packages
183 * that are consulted when looking for the handler for a protocol.
184 * The value associated with this attribute is a string with
185 * package names separated by vertical bars (<code>|</code>).</p>
186 */
187 public static final String PROTOCOL_PROVIDER_PACKAGES =
188 "jmx.remote.protocol.provider.pkgs";
189
190 /**
191 * <p>Name of the attribute that specifies the class
192 * loader for loading protocol providers.
193 * The value associated with this attribute is an instance
194 * of {@link ClassLoader}.</p>
195 */
196 public static final String PROTOCOL_PROVIDER_CLASS_LOADER =
197 "jmx.remote.protocol.provider.class.loader";
198
199 private static final String PROTOCOL_PROVIDER_DEFAULT_PACKAGE =
200 "com.sun.jmx.remote.protocol";
201
202 private static final ClassLogger logger =
203 new ClassLogger("javax.management.remote.misc","JMXConnectorServerFactory");
204
205 /** There are no instances of this class. */
206 private JMXConnectorServerFactory() {
207 }
208
209 private static JMXConnectorServer
210 getConnectorServerAsService(ClassLoader loader, JMXServiceURL url,
211 Map<String, ?> map, MBeanServer mbs,
212 Predicate<Provider<?>> filter)
213 throws IOException {
214 final ConnectorFactory<JMXConnectorServerProvider,JMXConnectorServer>
215 factory = (p) -> p.newJMXConnectorServer(url, map, mbs);
216 return JMXConnectorFactory.getConnectorAsService(
217 JMXConnectorServerProvider.class,
218 loader, url, filter, factory);
219 }
220
221 /**
222 * <p>Creates a connector server at the given address. The
223 * resultant server is not started until its {@link
224 * JMXConnectorServer#start() start} method is called.</p>
225 *
226 * @param serviceURL the address of the new connector server. The
227 * actual address of the new connector server, as returned by its
228 * {@link JMXConnectorServer#getAddress() getAddress} method, will
229 * not necessarily be exactly the same. For example, it might
230 * include a port number if the original address did not.
231 *
232 * @param environment a set of attributes to control the new
233 * connector server's behavior. This parameter can be null.
234 * Keys in this map must be Strings. The appropriate type of each
235 * associated value depends on the attribute. The contents of
236 * <code>environment</code> are not changed by this call.
237 *
238 * @param mbeanServer the MBean server that this connector server
239 * is attached to. Null if this connector server will be attached
240 * to an MBean server by being registered in it.
241 *
242 * @return a <code>JMXConnectorServer</code> representing the new
243 * connector server. Each successful call to this method produces
244 * a different object.
245 *
246 * @exception NullPointerException if <code>serviceURL</code> is null.
247 *
248 * @exception IOException if the connector server cannot be made
249 * because of a communication problem.
250 *
251 * @exception MalformedURLException if there is no provider for the
252 * protocol in <code>serviceURL</code>.
253 *
254 * @exception JMXProviderException if there is a provider for the
255 * protocol in <code>serviceURL</code> but it cannot be used for
256 * some reason.
257 */
258 public static JMXConnectorServer
259 newJMXConnectorServer(JMXServiceURL serviceURL,
260 Map<String,?> environment,
261 MBeanServer mbeanServer)
262 throws IOException {
263 Map<String, Object> envcopy;
264 if (environment == null)
265 envcopy = new HashMap<String, Object>();
266 else {
267 EnvHelp.checkAttributes(environment);
268 envcopy = new HashMap<String, Object>(environment);
269 }
270
271 final Class<JMXConnectorServerProvider> targetInterface =
272 JMXConnectorServerProvider.class;
273 final ClassLoader loader =
274 JMXConnectorFactory.resolveClassLoader(envcopy);
275 final String protocol = serviceURL.getProtocol();
276 final String providerClassName = "ServerProvider";
277
278 JMXConnectorServerProvider provider =
279 JMXConnectorFactory.getProvider(serviceURL,
280 envcopy,
281 providerClassName,
282 targetInterface,
283 loader);
284
285 IOException exception = null;
286 JMXConnectorServer connection = null;
287 if (provider == null) {
288 Predicate<Provider<?>> systemProvider =
289 JMXConnectorFactory::isSystemProvider;
290 // Loader is null when context class loader is set to null
291 // and no loader has been provided in map.
292 // com.sun.jmx.remote.util.Service class extracted from j2se
293 // provider search algorithm doesn't handle well null classloader.
294 if (loader != null) {
295 try {
296 connection =
297 getConnectorServerAsService(loader,
298 serviceURL,
299 envcopy,
300 mbeanServer,
301 systemProvider.negate());
302 if (connection != null)
303 return connection;
304 } catch (JMXProviderException e) {
305 throw e;
306 } catch (IOException e) {
307 exception = e;
308 }
309 }
310 connection = getConnectorServerAsService(
311 JMXConnectorFactory.class.getClassLoader(),
312 serviceURL,
313 Collections.unmodifiableMap(envcopy),
314 mbeanServer,
315 systemProvider);
316 if (connection != null) return connection;
317 }
318
319 if (provider == null) {
320 MalformedURLException e =
321 new MalformedURLException("Unsupported protocol: " + protocol);
322 if (exception == null) {
323 throw e;
324 } else {
325 throw EnvHelp.initCause(e, exception);
326 }
327 }
328
329 envcopy = Collections.unmodifiableMap(envcopy);
330
331 return provider.newJMXConnectorServer(serviceURL,
332 envcopy,
333 mbeanServer);
334 }
335 }