Source Code Cross Referenced for MLet.java in  » EJB-Server-JBoss-4.2.1 » jmx » javax » management » loading » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » EJB Server JBoss 4.2.1 » jmx » javax.management.loading 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * JBoss, Home of Professional Open Source.
003:         * Copyright 2006, Red Hat Middleware LLC, and individual contributors
004:         * as indicated by the @author tags. See the copyright.txt file in the
005:         * distribution for a full listing of individual contributors.
006:         *
007:         * This is free software; you can redistribute it and/or modify it
008:         * under the terms of the GNU Lesser General Public License as
009:         * published by the Free Software Foundation; either version 2.1 of
010:         * the License, or (at your option) any later version.
011:         *
012:         * This software is distributed in the hope that it will be useful,
013:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
014:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
015:         * Lesser General Public License for more details.
016:         *
017:         * You should have received a copy of the GNU Lesser General Public
018:         * License along with this software; if not, write to the Free
019:         * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
021:         */
022:        package javax.management.loading;
023:
024:        import java.io.Externalizable;
025:        import java.io.IOException;
026:        import java.io.ObjectInput;
027:        import java.io.ObjectOutput;
028:        import java.net.MalformedURLException;
029:        import java.net.URL;
030:        import java.net.URLClassLoader;
031:        import java.net.URLStreamHandlerFactory;
032:        import java.security.AccessController;
033:        import java.security.PrivilegedActionException;
034:        import java.security.PrivilegedExceptionAction;
035:        import java.text.ParseException;
036:        import java.util.HashSet;
037:        import java.util.Iterator;
038:        import java.util.Set;
039:
040:        import javax.management.MBeanRegistration;
041:        import javax.management.MBeanServer;
042:        import javax.management.ObjectName;
043:        import javax.management.ServiceNotFoundException;
044:
045:        import org.jboss.logging.Logger;
046:        import org.jboss.mx.loading.MBeanElement;
047:        import org.jboss.mx.loading.MBeanFileParser;
048:        import org.jboss.mx.loading.MLetParser;
049:        import org.jboss.mx.loading.RepositoryClassLoader;
050:        import org.jboss.mx.server.ServerConstants;
051:        import org.jboss.mx.util.MBeanInstaller;
052:        import org.jboss.mx.util.ObjectNameFactory;
053:        import org.jboss.util.NestedRuntimeException;
054:        import org.jboss.util.id.SerialVersion;
055:
056:        /**
057:         * URL classloader capable of parsing an MLet text file adhering to the file
058:         * format defined in the JMX specification (v1.0).
059:         *
060:         * @see javax.management.loading.MLetMBean
061:         *
062:         * @author  <a href="mailto:juha@jboss.org">Juha Lindfors</a>.
063:         * @version $Revision: 57200 $  
064:         */
065:        public class MLet extends URLClassLoader implements  MLetMBean,
066:                MBeanRegistration, Externalizable {
067:            // Constants --------------------------------------------------------
068:
069:            private static final long serialVersionUID;
070:            static {
071:                if (SerialVersion.version == SerialVersion.LEGACY)
072:                    serialVersionUID = -3671491454721196053L;
073:                else
074:                    serialVersionUID = 3636148327800330130L;
075:            }
076:
077:            /**
078:             * Log reference.
079:             */
080:            private static final Logger log = Logger.getLogger(MLet.class);
081:
082:            // FIXME: (RI javadoc) Note -  The MLet class loader uses the DefaultLoaderRepository
083:            //        to load classes that could not be found in the loaded jar files.
084:            //
085:            // IOW we need to override findClass for this cl...
086:            // I think we can avoid the ugly dlr field hack from RI
087:
088:            // Attributes ----------------------------------------------------
089:
090:            /** Reference to the MBean server this loader is registered to. */
091:            private MBeanServer server = null;
092:
093:            /** MBean installer based on MLet version. */
094:            private MBeanInstaller installer = null;
095:
096:            /** Our wrapping classloader */
097:            private RepositoryClassLoader rcl = null;
098:
099:            /**
100:             * Boolean field that indicates whether the MLet should delegate classloading
101:             * to classloader repository in case the requested class is not found from
102:             * its own set of loaded classes. Defaults to true.
103:             */
104:            private boolean delegateToCLR = true;
105:
106:            /**
107:             * Library directory for native libs.
108:             */
109:            private String libraryDir = null;
110:
111:            // Static --------------------------------------------------------
112:
113:            // Constructors --------------------------------------------------
114:
115:            public MLet() {
116:                super (new URL[0], Thread.currentThread()
117:                        .getContextClassLoader());
118:            }
119:
120:            public MLet(URL[] urls) {
121:                super (urls, Thread.currentThread().getContextClassLoader());
122:            }
123:
124:            public MLet(URL[] urls, ClassLoader parent) {
125:                super (urls, parent);
126:            }
127:
128:            public MLet(URL[] urls, ClassLoader parent,
129:                    URLStreamHandlerFactory factory) {
130:                super (urls, parent, factory);
131:            }
132:
133:            /*
134:             * JMX 1.2 spec change notes:
135:             *
136:             *    Each constructor for the MLet class acquires an overloaded version
137:             *    with a booleanparameter delegateToCLR, which defaults to true.  When
138:             *    false, the MLet does not delegate to the CLR when it fails to find
139:             *    classes but directly throws ClassNotFoundException.
140:             */
141:
142:            public MLet(URL[] urls, boolean delegateToCLR) {
143:                super (urls, Thread.currentThread().getContextClassLoader());
144:
145:                this .delegateToCLR = delegateToCLR;
146:            }
147:
148:            public MLet(URL[] urls, ClassLoader parent, boolean delegateToCLR) {
149:                super (urls, parent);
150:
151:                this .delegateToCLR = delegateToCLR;
152:            }
153:
154:            public MLet(URL[] urls, ClassLoader parent,
155:                    URLStreamHandlerFactory factory, boolean delegateToCLR) {
156:                super (urls, parent, factory);
157:
158:                this .delegateToCLR = delegateToCLR;
159:            }
160:
161:            // MBeanRegistration implementation ------------------------------
162:
163:            public ObjectName preRegister(MBeanServer server, ObjectName name)
164:                    throws Exception {
165:                if (name == null) {
166:                    String defaultDomain = server.getDefaultDomain();
167:                    name = new ObjectName(defaultDomain + ":type=MLet");
168:                }
169:
170:                this .server = server;
171:                this .installer = new MBeanInstaller(server, this , name);
172:
173:                return name;
174:            }
175:
176:            public void postRegister(Boolean registrationDone) {
177:            }
178:
179:            public void preDeregister() throws Exception {
180:            }
181:
182:            public void postDeregister() {
183:                server = null;
184:                rcl = null;
185:                installer = null;
186:            }
187:
188:            // MLetMBean implementation --------------------------------------
189:
190:            public Set getMBeansFromURL(String url)
191:                    throws ServiceNotFoundException {
192:                try {
193:                    return getMBeansFromURL(new URL(url));
194:                } catch (MalformedURLException e) {
195:                    throw new ServiceNotFoundException("Malformed URL:" + url);
196:                }
197:            }
198:
199:            public Set getMBeansFromURL(URL url)
200:                    throws ServiceNotFoundException {
201:                if (server == null)
202:                    throw new ServiceNotFoundException(
203:                            "Loader must be registered to the server before loading the MBeans.");
204:
205:                HashSet mbeans = new HashSet();
206:                MBeanElement element = null;
207:
208:                try {
209:                    MBeanFileParser parser = new MLetParser();
210:                    Set mlets = parser.parseMBeanFile(url);
211:
212:                    if (mlets.size() == 0)
213:                        throw new ServiceNotFoundException(
214:                                "The specified URL '" + url
215:                                        + "' does not contain MLET tags.");
216:
217:                    Iterator it = mlets.iterator();
218:                    while (it.hasNext()) {
219:                        element = (MBeanElement) it.next();
220:
221:                        // pass delegateToCLR property to the MBean installer
222:                        element.setProperty(MBeanElement.MLET_DELEGATE_TO_CLR,
223:                                new Boolean(delegateToCLR));
224:
225:                        String codebase = element.getCodebase();
226:
227:                        // if no codebase is specified then the url of the mlet text file is used
228:                        if (codebase == null)
229:                            codebase = url.toString().substring(0,
230:                                    url.toString().lastIndexOf('/'));
231:
232:                        Iterator archives = element.getArchives().iterator();
233:                        String codebaseURL = null;
234:
235:                        while (archives.hasNext()) {
236:                            try {
237:                                codebaseURL = codebase
238:                                        + ((codebase.endsWith("/")) ? "" : "/")
239:                                        + archives.next();
240:
241:                                addURL(new URL(url, codebaseURL));
242:                            } catch (MalformedURLException e) {
243:                                log
244:                                        .error("MLET ERROR: malformed codebase URL: '"
245:                                                + codebaseURL + "'");
246:                            }
247:                        }
248:
249:                        try {
250:                            // FIXME: see the note at the beginning... we use an explicit loader
251:                            //        in the createMBean() call to force this classloader to
252:                            //        be used first to load all MLet classes. Normally this form
253:                            //        of createMBean() call will not delegate to DLR even though
254:                            //        the javadoc requires it. Therefore the findClass() should
255:                            //        be overridden to delegate to the repository. 
256:                            /*
257:                            mbeans.add(server.createMBean(
258:                                  element.getCode(),
259:                                  (element.getName() != null) ? new ObjectName(element.getName()) : null,
260:                                  objectName,
261:                                  element.getConstructorValues(),
262:                                  element.getConstructorTypes())
263:                            );
264:                             */
265:
266:                            // installer creates or upgrades this mbean based on the MLet version
267:                            mbeans.add(installer.installMBean(element));
268:                        } catch (Throwable t) {
269:                            // if mbean can't be created, throwable is added to the return set
270:                            mbeans.add(t);
271:
272:                            log.error("MLET ERROR: can't create MBean: ", t);
273:                        }
274:                    }
275:                } catch (ParseException e) {
276:                    throw new ServiceNotFoundException(e.getMessage());
277:                }
278:
279:                return mbeans;
280:            }
281:
282:            public void addURL(URL url) {
283:                super .addURL(url);
284:                if (rcl == null && server != null)
285:                    getRepositoryClassLoader();
286:                rcl.addURL(url);
287:            }
288:
289:            public void addURL(String url) throws ServiceNotFoundException {
290:                try {
291:                    this .addURL(new URL(url));
292:                } catch (MalformedURLException e) {
293:                    throw new ServiceNotFoundException("Malformed URL: " + url);
294:                }
295:            }
296:
297:            /** Returns the search path of URLs for loading classes and resources. This
298:             * includes the original list of URLs specified to the constructor, along
299:             * with any URLs subsequently appended by the addURL() method.
300:             *  
301:             * @return
302:             */
303:            public URL[] getURLs() {
304:                return super .getURLs();
305:            }
306:
307:            public String getLibraryDirectory() {
308:                return libraryDir;
309:            }
310:
311:            public void setLibraryDirectory(String libdir) {
312:                this .libraryDir = libdir;
313:            }
314:
315:            // Externalizable implementation ---------------------------------
316:
317:            /* Part of JMX 1.2 specification */
318:
319:            // The spec does not require implementations of the externalizable interface
320:            // in which case the readExternal() and writeExternal() methods may throw
321:            // an unsupported operation exception
322:            /**
323:             * This implementation does not support externalizing an MLet.
324:             *
325:             * @throws UnsupportedOperationException
326:             */
327:            public void readExternal(ObjectInput in) throws IOException,
328:                    ClassNotFoundException, UnsupportedOperationException {
329:                throw new UnsupportedOperationException(
330:                        "MLet serialization not supported.");
331:            }
332:
333:            /**
334:             * This implementation does not support externalizing an MLet.
335:             *
336:             * @throws UnsupportedOperationException
337:             */
338:            public void writeExternal(ObjectOutput out) throws IOException,
339:                    UnsupportedOperationException {
340:                throw new UnsupportedOperationException(
341:                        "MLet serialization not supported.");
342:            }
343:
344:            // Classloader overrides -----------------------------------------
345:
346:            /** Load a class, using the given ClassLoaderRepository if the class is not
347:             * found in this MLet's URLs. The given ClassLoaderRepository can be null,
348:             * in which case a ClassNotFoundException occurs immediately if the class is
349:             * not found in this MLet's URLs.
350:             * 
351:             * @param name
352:             * @param clr
353:             * @return
354:             * @throws ClassNotFoundException
355:             */
356:            public Class loadClass(String name, ClassLoaderRepository clr)
357:                    throws ClassNotFoundException {
358:                Class c = null;
359:                try {
360:                    c = loadClass(name);
361:                } catch (ClassNotFoundException e) {
362:                    if (clr != null)
363:                        c = clr.loadClass(name);
364:                    else
365:                        throw e;
366:                }
367:                return c;
368:            }
369:
370:            /** This method is to be overridden when extending this service to support
371:             * caching and versioning. It is called from getMBeansFromURL when the
372:             * version, codebase, and jarfile have been extracted from the MLet file,
373:             * and can be used to verify that it is all right to load the given MBean,
374:             * or to replace the given URL with a different one.
375:             * 
376:             * The default implementation of this method returns codebase unchanged.
377:             * 
378:             * @param version
379:             * @param codebase
380:             * @param jarfile
381:             * @param mlet
382:             * @return
383:             * @throws Exception
384:             */
385:            protected URL check(String version, URL codebase, String jarfile,
386:                    MLetContent mlet) throws Exception {
387:                return codebase;
388:            }
389:
390:            protected Class loadClass(String name, boolean resolve)
391:                    throws ClassNotFoundException {
392:                boolean trace = log.isTraceEnabled();
393:                if (trace)
394:                    log.trace("loadClass " + this  + " name=" + name);
395:                Class clazz = null;
396:                try {
397:                    clazz = super .loadClass(name, resolve);
398:                    return clazz;
399:                } finally {
400:                    if (trace) {
401:                        if (clazz != null)
402:                            log.trace("loadClass " + this  + " name=" + name
403:                                    + " class=" + clazz + " cl="
404:                                    + clazz.getClassLoader());
405:                        else
406:                            log.trace("loadClass " + this  + " name=" + name
407:                                    + " not found");
408:                    }
409:                }
410:            }
411:
412:            protected Class findClass(final String name)
413:                    throws ClassNotFoundException {
414:                try {
415:                    return super .findClass(name);
416:                } catch (ClassNotFoundException e) {
417:                    if (delegateToCLR) {
418:                        try {
419:                            return (Class) AccessController
420:                                    .doPrivileged(new PrivilegedExceptionAction() {
421:                                        public Object run()
422:                                                throws ClassNotFoundException {
423:                                            return server
424:                                                    .getClassLoaderRepository()
425:                                                    .loadClassBefore(MLet.this ,
426:                                                            name);
427:                                        }
428:                                    });
429:                        } catch (PrivilegedActionException pe) {
430:                            throw (ClassNotFoundException) pe.getException();
431:                        }
432:                    } else
433:                        throw e;
434:                }
435:            }
436:
437:            protected String findLibrary(String libname) {
438:                return super .findLibrary(libname);
439:            }
440:
441:            private void getRepositoryClassLoader() {
442:                try {
443:                    ObjectName loader = ObjectNameFactory
444:                            .create(ServerConstants.DEFAULT_LOADER_NAME);
445:                    rcl = (RepositoryClassLoader) server.invoke(loader,
446:                            "getWrappingClassLoader", new Object[] { this  },
447:                            new String[] { ClassLoader.class.getName() });
448:                    log.debug("MLet " + this  + " using wrapper " + rcl);
449:                } catch (Exception e) {
450:                    throw new NestedRuntimeException(e);
451:                }
452:            }
453:        }
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