Source Code Cross Referenced for EnvironmentClassLoader.java in  » EJB-Server-resin-3.1.5 » resin » com » caucho » loader » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » EJB Server resin 3.1.5 » resin » com.caucho.loader 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
003:         *
004:         * This file is part of Resin(R) Open Source
005:         *
006:         * Each copy or derived work must preserve the copyright notice and this
007:         * notice unmodified.
008:         *
009:         * Resin Open Source is free software; you can redistribute it and/or modify
010:         * it under the terms of the GNU General Public License as published by
011:         * the Free Software Foundation; either version 2 of the License, or
012:         * (at your option) any later version.
013:         *
014:         * Resin Open Source is distributed in the hope that it will be useful,
015:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
016:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
017:         * of NON-INFRINGEMENT.  See the GNU General Public License for more
018:         * details.
019:         *
020:         * You should have received a copy of the GNU General Public License
021:         * along with Resin Open Source; if not, write to the
022:         *
023:         *   Free Software Foundation, Inc.
024:         *   59 Temple Place, Suite 330
025:         *   Boston, MA 02111-1307  USA
026:         *
027:         * @author Scott Ferguson
028:         */
029:
030:        package com.caucho.loader;
031:
032:        import com.caucho.jca.UserTransactionProxy;
033:        import com.caucho.jmx.Jmx;
034:        import com.caucho.lifecycle.Lifecycle;
035:        import com.caucho.log.EnvironmentStream;
036:        import com.caucho.loader.enhancer.ScanManager;
037:        import com.caucho.loader.enhancer.ScanListener;
038:        import com.caucho.management.j2ee.J2EEManagedObject;
039:        import com.caucho.management.j2ee.JTAResource;
040:        import com.caucho.management.server.ClassLoaderMXBean;
041:        import com.caucho.naming.Jndi;
042:        import com.caucho.security.PolicyImpl;
043:        import com.caucho.transaction.TransactionManagerImpl;
044:        import com.caucho.util.ResinThreadPoolExecutor;
045:        import com.caucho.vfs.Vfs;
046:
047:        import javax.management.*;
048:        import java.lang.management.*;
049:        import javax.naming.*;
050:        import java.net.URL;
051:        import java.lang.reflect.Method;
052:        import java.util.ArrayList;
053:        import java.util.Hashtable;
054:        import java.util.Properties;
055:        import java.util.logging.*;
056:
057:        /**
058:         * Class loader which checks for changes in class files and automatically
059:         * picks up new jars.
060:         *
061:         * <p>DynamicClassLoaders can be chained creating one virtual class loader.
062:         * From the perspective of the JDK, it's all one classloader.  Internally,
063:         * the class loader chain searches like a classpath.
064:         */
065:        public class EnvironmentClassLoader extends DynamicClassLoader {
066:            private static Logger _log;
067:
068:            private static boolean _isStaticInit;
069:
070:            // listeners invoked at the start of any child environment
071:            private static EnvironmentLocal<ArrayList<EnvironmentListener>> _childListeners = new EnvironmentLocal<ArrayList<EnvironmentListener>>();
072:
073:            // listeners invoked when a Loader is added
074:            private static EnvironmentLocal<ArrayList<AddLoaderListener>> _addLoaderListeners = new EnvironmentLocal<ArrayList<AddLoaderListener>>();
075:
076:            // The owning bean
077:            private EnvironmentBean _owner;
078:
079:            // Class loader specific attributes
080:            private Hashtable<String, Object> _attributes = new Hashtable<String, Object>(
081:                    8);
082:
083:            private ArrayList<ScanListener> _scanListeners;
084:            private ArrayList<URL> _pendingScanUrls = new ArrayList<URL>();
085:
086:            // Array of listeners
087:            // XXX: this used to be a weak reference list, but that caused problems
088:            // server/306i  - can't be weak reference, instead create WeakStopListener
089:            private ArrayList<EnvironmentListener> _listeners;
090:            private WeakStopListener _stopListener;
091:
092:            // The state of the environment
093:            private volatile Lifecycle _lifecycle = new Lifecycle();
094:
095:            private Throwable _configException;
096:
097:            /**
098:             * Creates a new environment class loader.
099:             */
100:            public EnvironmentClassLoader() {
101:                this (Thread.currentThread().getContextClassLoader(), null);
102:            }
103:
104:            /**
105:             * Creates a new environment class loader.
106:             */
107:            public EnvironmentClassLoader(String id) {
108:                this (Thread.currentThread().getContextClassLoader(), id);
109:            }
110:
111:            /**
112:             * Creates a new environment class loader.
113:             */
114:            public EnvironmentClassLoader(ClassLoader parent) {
115:                this (parent, null);
116:            }
117:
118:            /**
119:             * Creates a new environment class loader.
120:             */
121:            public EnvironmentClassLoader(ClassLoader parent, String id) {
122:                super (parent);
123:
124:                if (id != null)
125:                    setId(id);
126:
127:                // initializeEnvironment();
128:
129:                initListeners();
130:            }
131:
132:            /**
133:             * Returns the environment's owner.
134:             */
135:            public EnvironmentBean getOwner() {
136:                return _owner;
137:            }
138:
139:            /**
140:             * Sets the environment's owner.
141:             */
142:            public void setOwner(EnvironmentBean owner) {
143:                _owner = owner;
144:            }
145:
146:            /**
147:             * Sets the config exception.
148:             */
149:            public void setConfigException(Throwable e) {
150:                if (_configException == null)
151:                    _configException = e;
152:            }
153:
154:            /**
155:             * Gets the config exception.
156:             */
157:            public Throwable getConfigException() {
158:                return _configException;
159:            }
160:
161:            /**
162:             * Returns true if the environment is active
163:             */
164:            public boolean isActive() {
165:                return _lifecycle.isActive();
166:            }
167:
168:            /**
169:             * Initialize the environment.
170:             */
171:            public void init() {
172:                super .init();
173:
174:                initEnvironment();
175:            }
176:
177:            protected void initEnvironment() {
178:                initializeEnvironment();
179:            }
180:
181:            /**
182:             * Returns the named attributes
183:             */
184:            public Object getAttribute(String name) {
185:                if (_attributes != null)
186:                    return _attributes.get(name);
187:                else
188:                    return null;
189:            }
190:
191:            /**
192:             * Sets the named attributes
193:             */
194:            public Object setAttribute(String name, Object obj) {
195:                if (obj == null) {
196:                    if (_attributes == null)
197:                        return null;
198:                    else
199:                        return _attributes.remove(name);
200:                }
201:
202:                if (_attributes == null)
203:                    _attributes = new Hashtable<String, Object>(8);
204:
205:                return _attributes.put(name, obj);
206:            }
207:
208:            /**
209:             * Removes the named attributes
210:             */
211:            public Object removeAttribute(String name) {
212:                if (_attributes == null)
213:                    return null;
214:                else
215:                    return _attributes.remove(name);
216:            }
217:
218:            /**
219:             * Adds a listener to detect environment lifecycle changes.
220:             */
221:            public void addListener(EnvironmentListener listener) {
222:                synchronized (this ) {
223:                    if (_listeners == null) {
224:                        _listeners = new ArrayList<EnvironmentListener>();
225:
226:                        initListeners();
227:                    }
228:                }
229:
230:                synchronized (_listeners) {
231:                    for (int i = _listeners.size() - 1; i >= 0; i--) {
232:                        EnvironmentListener oldListener = _listeners.get(i);
233:
234:                        if (listener == oldListener) {
235:                            return;
236:                        } else if (oldListener == null)
237:                            _listeners.remove(i);
238:                    }
239:
240:                    _listeners.add(listener);
241:                }
242:
243:                if (_lifecycle.isStarting()) {
244:                    listener.environmentConfig(this );
245:                }
246:
247:                if (_lifecycle.isActive()) {
248:                    listener.environmentStart(this );
249:                }
250:            }
251:
252:            /**
253:             * Adds self as a listener.
254:             */
255:            private void initListeners() {
256:                ClassLoader parent = getParent();
257:
258:                for (; parent != null; parent = parent.getParent()) {
259:                    if (parent instanceof  EnvironmentClassLoader) {
260:                        EnvironmentClassLoader loader = (EnvironmentClassLoader) parent;
261:
262:                        if (_stopListener == null)
263:                            _stopListener = new WeakStopListener(this );
264:
265:                        loader.addListener(_stopListener);
266:
267:                        return;
268:                    }
269:                }
270:            }
271:
272:            /**
273:             * Adds a listener to detect environment lifecycle changes.
274:             */
275:            public void removeListener(EnvironmentListener listener) {
276:                if (_listeners == null)
277:                    return;
278:
279:                synchronized (_listeners) {
280:                    for (int i = _listeners.size() - 1; i >= 0; i--) {
281:                        EnvironmentListener oldListener = _listeners.get(i);
282:
283:                        if (listener == oldListener) {
284:                            _listeners.remove(i);
285:                            return;
286:                        } else if (oldListener == null)
287:                            _listeners.remove(i);
288:                    }
289:                }
290:            }
291:
292:            /**
293:             * Adds a child listener.
294:             */
295:            void addChildListener(EnvironmentListener listener) {
296:                synchronized (_childListeners) {
297:                    ArrayList<EnvironmentListener> listeners = _childListeners
298:                            .getLevel(this );
299:
300:                    if (listeners == null) {
301:                        listeners = new ArrayList<EnvironmentListener>();
302:
303:                        _childListeners.set(listeners, this );
304:                    }
305:
306:                    listeners.add(listener);
307:                }
308:
309:                if (_lifecycle.isActive()) {
310:                    listener.environmentStart(this );
311:                }
312:            }
313:
314:            /**
315:             * Removes a child listener.
316:             */
317:            void removeChildListener(EnvironmentListener listener) {
318:                synchronized (_childListeners) {
319:                    ArrayList<EnvironmentListener> listeners = _childListeners
320:                            .getLevel(this );
321:
322:                    if (listeners != null)
323:                        listeners.remove(listener);
324:                }
325:            }
326:
327:            /**
328:             * Returns the listeners.
329:             */
330:            protected ArrayList<EnvironmentListener> getEnvironmentListeners() {
331:                ArrayList<EnvironmentListener> listeners;
332:                listeners = new ArrayList<EnvironmentListener>();
333:
334:                // add the descendent listeners
335:                synchronized (_childListeners) {
336:                    ClassLoader loader;
337:
338:                    for (loader = this ; loader != null; loader = loader
339:                            .getParent()) {
340:                        if (loader instanceof  EnvironmentClassLoader) {
341:                            ArrayList<EnvironmentListener> childListeners;
342:                            childListeners = _childListeners.getLevel(loader);
343:
344:                            if (childListeners != null)
345:                                listeners.addAll(childListeners);
346:                        }
347:                    }
348:                }
349:
350:                if (_listeners == null)
351:                    return listeners;
352:
353:                synchronized (_listeners) {
354:                    for (int i = 0; i < _listeners.size(); i++) {
355:                        EnvironmentListener listener = _listeners.get(i);
356:
357:                        if (listener != null)
358:                            listeners.add(listener);
359:                        else {
360:                            _listeners.remove(i);
361:                            i--;
362:                        }
363:                    }
364:                }
365:
366:                return listeners;
367:            }
368:
369:            /**
370:             * Adds a child listener.
371:             */
372:            public void addLoaderListener(AddLoaderListener listener) {
373:                synchronized (_addLoaderListeners) {
374:                    ArrayList<AddLoaderListener> listeners = _addLoaderListeners
375:                            .getLevel(this );
376:
377:                    if (listeners == null) {
378:                        listeners = new ArrayList<AddLoaderListener>();
379:
380:                        _addLoaderListeners.set(listeners, this );
381:                    }
382:
383:                    listeners.add(listener);
384:                }
385:
386:                listener.addLoader(this );
387:            }
388:
389:            /**
390:             * Returns the listeners.
391:             */
392:            protected ArrayList<AddLoaderListener> getLoaderListeners() {
393:                ArrayList<AddLoaderListener> listeners;
394:                listeners = new ArrayList<AddLoaderListener>();
395:
396:                // add the descendent listeners
397:                synchronized (_addLoaderListeners) {
398:                    ClassLoader loader;
399:
400:                    for (loader = this ; loader != null; loader = loader
401:                            .getParent()) {
402:                        if (loader instanceof  EnvironmentClassLoader) {
403:                            ArrayList<AddLoaderListener> childListeners;
404:                            childListeners = _addLoaderListeners
405:                                    .getLevel(loader);
406:
407:                            if (childListeners != null)
408:                                listeners.addAll(childListeners);
409:                        }
410:                    }
411:                }
412:
413:                return listeners;
414:            }
415:
416:            /**
417:             * Adds a listener to detect class loader changes.
418:             */
419:            @Override
420:            protected void sendAddLoaderEventImpl() {
421:                ArrayList<AddLoaderListener> listeners = getLoaderListeners();
422:
423:                for (int i = 0; listeners != null && i < listeners.size(); i++) {
424:                    listeners.get(i).addLoader(this );
425:                }
426:            }
427:
428:            /**
429:             * Adds the URL to the URLClassLoader.
430:             */
431:            @Override
432:            public void addURL(URL url) {
433:                super .addURL(url);
434:
435:                _pendingScanUrls.add(url);
436:            }
437:
438:            /**
439:             * Adds a scan listener.
440:             */
441:            public void addScanListener(ScanListener listener) {
442:                if (_scanListeners == null)
443:                    _scanListeners = new ArrayList<ScanListener>();
444:
445:                _scanListeners.add(listener);
446:
447:                ArrayList<URL> urlList = new ArrayList<URL>();
448:                for (URL url : getURLs()) {
449:                    if (!_pendingScanUrls.contains(url))
450:                        urlList.add(url);
451:                }
452:
453:                if (urlList.size() > 0) {
454:                    try {
455:                        make();
456:                    } catch (Exception e) {
457:                        log().log(Level.WARNING, e.toString(), e);
458:
459:                        if (_configException == null)
460:                            _configException = e;
461:                    }
462:
463:                    ArrayList<ScanListener> selfList = new ArrayList<ScanListener>();
464:                    selfList.add(listener);
465:                    ScanManager scanManager = new ScanManager(selfList);
466:
467:                    for (URL url : urlList) {
468:                        scanManager.scan(this , url);
469:                    }
470:                }
471:            }
472:
473:            /**
474:             * Called when the <class-loader> completes.
475:             */
476:            public void validate() {
477:                super .validate();
478:            }
479:
480:            @Override
481:            public void scan() {
482:                ArrayList<URL> urlList = new ArrayList<URL>(_pendingScanUrls);
483:                _pendingScanUrls.clear();
484:
485:                if (_scanListeners != null && urlList.size() > 0) {
486:                    try {
487:                        make();
488:                    } catch (Exception e) {
489:                        log().log(Level.WARNING, e.toString(), e);
490:
491:                        if (_configException == null)
492:                            _configException = e;
493:                    }
494:
495:                    ScanManager scanManager = new ScanManager(_scanListeners);
496:
497:                    for (URL url : urlList) {
498:                        scanManager.scan(this , url);
499:                    }
500:                }
501:
502:                sendAddLoaderEventImpl();
503:            }
504:
505:            /**
506:             * Starts the config phase of the environment.
507:             */
508:            private void config() {
509:                sendAddLoaderEvent();
510:
511:                ArrayList<EnvironmentListener> listeners = getEnvironmentListeners();
512:
513:                int size = listeners.size();
514:                for (int i = 0; listeners != null && i < size; i++) {
515:                    EnvironmentListener listener = listeners.get(i);
516:
517:                    listener.environmentConfig(this );
518:                }
519:            }
520:
521:            /**
522:             * Marks the environment of the class loader as started.  The
523:             * class loader itself doesn't use this, but a callback might.
524:             */
525:            public void start() {
526:                if (!_lifecycle.toStarting())
527:                    return;
528:
529:                sendAddLoaderEvent();
530:
531:                config();
532:
533:                ArrayList<EnvironmentListener> listeners = getEnvironmentListeners();
534:
535:                int size = listeners.size();
536:                for (int i = 0; listeners != null && i < size; i++) {
537:                    EnvironmentListener listener = listeners.get(i);
538:
539:                    listener.environmentStart(this );
540:                }
541:
542:                _lifecycle.toActive();
543:            }
544:
545:            /**
546:             * Stops the environment, closing down any resources.
547:             *
548:             * The resources are closed in the reverse order that they're started
549:             */
550:            public void stop() {
551:                if (!_lifecycle.toDestroy())
552:                    return;
553:
554:                ArrayList<EnvironmentListener> listeners = getEnvironmentListeners();
555:
556:                Thread thread = Thread.currentThread();
557:                ClassLoader oldLoader = thread.getContextClassLoader();
558:                thread.setContextClassLoader(this );
559:
560:                try {
561:                    // closing down in reverse
562:                    if (listeners != null) {
563:                        for (int i = listeners.size() - 1; i >= 0; i--) {
564:                            EnvironmentListener listener = listeners.get(i);
565:
566:                            try {
567:                                listener.environmentStop(this );
568:                            } catch (Throwable e) {
569:                                log().log(Level.WARNING, e.toString(), e);
570:                            }
571:                        }
572:                    }
573:                } finally {
574:                    thread.setContextClassLoader(oldLoader);
575:
576:                    // drain the thread pool for GC
577:                    ResinThreadPoolExecutor.getThreadPool().stopEnvironment(
578:                            this );
579:                }
580:            }
581:
582:            /**
583:             * Copies the loader.
584:             */
585:            protected void replace(EnvironmentClassLoader source) {
586:                super .replace(source);
587:
588:                // XXX: might need separate class
589:                _owner = source._owner;
590:                _attributes = source._attributes;
591:                if (source._listeners != null) {
592:                    if (_listeners == null)
593:                        _listeners = new ArrayList<EnvironmentListener>();
594:                    _listeners.addAll(source._listeners);
595:                    source._listeners.clear();
596:                }
597:
598:                /*
599:                _isStarted = source._isStarted;
600:                _isActive = source._isActive;
601:                _isStopped = source._isStopped;
602:                 */
603:            }
604:
605:            /**
606:             * Destroys the class loader.
607:             */
608:            public void destroy() {
609:                try {
610:                    WeakStopListener stopListener = _stopListener;
611:                    _stopListener = null;
612:
613:                    // make sure it's stopped first
614:                    stop();
615:
616:                    super .destroy();
617:
618:                    ClassLoader parent = getParent();
619:                    for (; parent != null; parent = parent.getParent()) {
620:                        if (parent instanceof  EnvironmentClassLoader) {
621:                            EnvironmentClassLoader loader = (EnvironmentClassLoader) parent;
622:
623:                            loader.removeListener(stopListener);
624:                        }
625:                    }
626:                } finally {
627:                    _owner = null;
628:                    _attributes = null;
629:                    _listeners = null;
630:                    _scanListeners = null;
631:                }
632:            }
633:
634:            public String toString() {
635:                if (getId() != null)
636:                    return getClass().getSimpleName() + "[" + getId() + "]";
637:                else {
638:                    return getClass().getSimpleName() + "[]";
639:                }
640:            }
641:
642:            /**
643:             * Initializes the environment
644:             */
645:            public static synchronized void initializeEnvironment() {
646:                if (_isStaticInit)
647:                    return;
648:
649:                _isStaticInit = true;
650:
651:                ClassLoader systemLoader = ClassLoader.getSystemClassLoader();
652:
653:                Thread thread = Thread.currentThread();
654:                ClassLoader oldLoader = thread.getContextClassLoader();
655:                try {
656:                    thread.setContextClassLoader(systemLoader);
657:
658:                    // #2281
659:                    // PolicyImpl.init();
660:
661:                    EnvironmentStream.setStdout(System.out);
662:                    EnvironmentStream.setStderr(System.err);
663:
664:                    try {
665:                        Vfs.initJNI();
666:                    } catch (Throwable e) {
667:                    }
668:
669:                    if (System.getProperty("org.xml.sax.driver") == null)
670:                        System.setProperty("org.xml.sax.driver",
671:                                "com.caucho.xml.Xml");
672:
673:                    Properties props = System.getProperties();
674:
675:                    /*
676:                    if (props.get("java.util.logging.manager") == null) {
677:                      props.put("java.util.logging.manager",
678:                                "com.caucho.log.LogManagerImpl");
679:                    }
680:                     */
681:
682:                    ClassLoader envClassLoader = EnvironmentClassLoader.class
683:                            .getClassLoader();
684:
685:                    boolean isGlobalLoadable = false;
686:                    try {
687:                        Class cl = Class.forName(
688:                                "com.caucho.naming.InitialContextFactoryImpl",
689:                                false, systemLoader);
690:
691:                        isGlobalLoadable = (cl != null);
692:                    } catch (Exception e) {
693:                        log().log(Level.FINER, e.toString(), e);
694:                    }
695:
696:                    if (isGlobalLoadable) {
697:                        // These properties require Resin to be at the system loader
698:
699:                        if (props.get("java.naming.factory.initial") == null) {
700:                            props
701:                                    .put("java.naming.factory.initial",
702:                                            "com.caucho.naming.InitialContextFactoryImpl");
703:                        }
704:
705:                        props.put("java.naming.factory.url.pkgs",
706:                                "com.caucho.naming");
707:
708:                        EnvironmentProperties
709:                                .enableEnvironmentSystemProperties(true);
710:
711:                        String oldBuilder = props
712:                                .getProperty("javax.management.builder.initial");
713:                        if (oldBuilder == null) {
714:                            oldBuilder = "com.caucho.jmx.MBeanServerBuilderImpl";
715:                            props.put("javax.management.builder.initial",
716:                                    oldBuilder);
717:                        }
718:
719:                        /*
720:                          props.put("javax.management.builder.initial",
721:                          "com.caucho.jmx.EnvironmentMBeanServerBuilder");
722:                         */
723:
724:                        if (MBeanServerFactory.findMBeanServer(null).size() == 0)
725:                            MBeanServerFactory.createMBeanServer("Resin");
726:
727:                        ManagementFactory.getPlatformMBeanServer();
728:                    }
729:
730:                    TransactionManagerImpl tm = TransactionManagerImpl
731:                            .getInstance();
732:                    // TransactionManagerImpl.setLocal(tm);
733:                    //Jndi.bindDeep("java:comp/TransactionManager", tm);
734:
735:                    UserTransactionProxy ut = UserTransactionProxy
736:                            .getInstance();
737:
738:                    Jndi.bindDeep("java:comp/env/jmx/MBeanServer", Jmx
739:                            .getGlobalMBeanServer());
740:                    Jndi.bindDeep("java:comp/env/jmx/GlobalMBeanServer", Jmx
741:                            .getGlobalMBeanServer());
742:
743:                    Jndi.bindDeep("java:comp/UserTransaction", ut);
744:
745:                    // server/16g0
746:                    // Applications are incorrectly using TransactionManager
747:                    // as an extended UserTransaction
748:                    Jndi.bindDeep("java:comp/TransactionManager", tm);
749:                    Jndi.bindDeep("java:/TransactionManager", tm);
750:
751:                    Jndi.bindDeep("java:comp/ThreadPool",
752:                            ResinThreadPoolExecutor.getThreadPool());
753:
754:                    /*
755:                    try {
756:                      Jndi.rebindDeep("java:comp/ORB",
757:                                      new com.caucho.iiop.orb.ORBImpl());
758:                    } catch (Exception e) {
759:                      e.printStackTrace();
760:                    }
761:                     */
762:
763:                    // J2EEManagedObject.register(new JTAResource(tm));
764:                } catch (NamingException e) {
765:                    log().log(Level.FINE, e.toString(), e);
766:                } catch (Throwable e) {
767:                    e.printStackTrace();
768:                } finally {
769:                    thread.setContextClassLoader(oldLoader);
770:                }
771:            }
772:
773:            private static final Logger log() {
774:                if (_log == null)
775:                    _log = Logger.getLogger(EnvironmentClassLoader.class
776:                            .getName());
777:
778:                return _log;
779:            }
780:        }
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