Source Code Cross Referenced for StoreManager.java in  » EJB-Server-resin-3.1.5 » resin » com » caucho » server » cluster » 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.server.cluster 
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.server.cluster;
031:
032:        import com.caucho.config.types.Period;
033:        import com.caucho.lifecycle.Lifecycle;
034:        import com.caucho.loader.ClassLoaderListener;
035:        import com.caucho.loader.DynamicClassLoader;
036:        import com.caucho.loader.Environment;
037:        import com.caucho.loader.EnvironmentClassLoader;
038:        import com.caucho.loader.EnvironmentListener;
039:        import com.caucho.management.server.PersistentStoreMXBean;
040:        import com.caucho.util.Alarm;
041:        import com.caucho.util.AlarmListener;
042:        import com.caucho.util.L10N;
043:        import com.caucho.util.LruCache;
044:        import com.caucho.vfs.TempStream;
045:
046:        import javax.annotation.PostConstruct;
047:        import java.io.IOException;
048:        import java.util.HashMap;
049:        import java.util.logging.Level;
050:        import java.util.logging.Logger;
051:
052:        /**
053:         * Base class for distributed stores.
054:         */
055:        abstract public class StoreManager implements  AlarmListener,
056:                EnvironmentListener, ClassLoaderListener {
057:            static protected final Logger log = Logger
058:                    .getLogger(StoreManager.class.getName());
059:            static final L10N L = new L10N(StoreManager.class);
060:
061:            private static int DECODE[];
062:
063:            private Cluster _cluster;
064:            private String _serverId;
065:
066:            protected int _selfIndex;
067:            private ServerConnector[] _serverList;
068:
069:            private Alarm _alarm;
070:
071:            // protected long _maxIdleTime = 24 * 3600 * 1000L;
072:            protected long _maxIdleTime = 3 * 3600 * 1000L;
073:            protected long _idleCheckInterval = 5 * 60 * 1000L;
074:
075:            protected boolean _isAlwaysLoad;
076:            protected boolean _isAlwaysSave;
077:
078:            protected HashMap<String, Store> _storeMap;
079:            protected LruCache<String, ClusterObject> _clusterObjects;
080:
081:            private final Lifecycle _lifecycle = new Lifecycle(log, toString());
082:
083:            //
084:            // statistics
085:            //
086:
087:            protected volatile long _loadCount;
088:            protected volatile long _loadFailCount;
089:
090:            protected volatile long _saveCount;
091:            protected volatile long _saveFailCount;
092:
093:            protected StoreManager() {
094:                _clusterObjects = new LruCache<String, ClusterObject>(4096);
095:                _clusterObjects.setEnableListeners(false);
096:
097:                _storeMap = new HashMap<String, Store>();
098:
099:                _alarm = new Alarm(this );
100:
101:                Environment.addClassLoaderListener(this );
102:            }
103:
104:            /**
105:             * Sets the cluster.
106:             */
107:            public void setCluster(Cluster cluster) {
108:                _cluster = cluster;
109:            }
110:
111:            /**
112:             * Gets the cluster.
113:             */
114:            public Cluster getCluster() {
115:                return _cluster;
116:            }
117:
118:            /**
119:             * Returns the admin.
120:             */
121:            public PersistentStoreMXBean getAdmin() {
122:                return null;
123:            }
124:
125:            /**
126:             * Set true if the store should always try to load the object.
127:             */
128:            public void setAlwaysLoad(boolean alwaysLoad) {
129:                _isAlwaysLoad = alwaysLoad;
130:            }
131:
132:            /**
133:             * Set true if the store should always try to load the object.
134:             */
135:            public boolean isAlwaysLoad() {
136:                return _isAlwaysLoad;
137:            }
138:
139:            /**
140:             * Set true if the store should always try to store the object.
141:             */
142:            public void setAlwaysSave(boolean alwaysSave) {
143:                _isAlwaysSave = alwaysSave;
144:            }
145:
146:            /**
147:             * Set true if the store should always try to store the object.
148:             */
149:            public boolean isAlwaysSave() {
150:                return _isAlwaysSave;
151:            }
152:
153:            /**
154:             * Returns the length of time an idle object can remain in the store before
155:             * being cleaned.
156:             */
157:            public long getMaxIdleTime() {
158:                return _maxIdleTime;
159:            }
160:
161:            /**
162:             * Sets the length of time an idle object can remain in the store before
163:             * being cleaned.
164:             */
165:            public void setMaxIdleTime(Period maxIdleTime) {
166:                _maxIdleTime = maxIdleTime.getPeriod();
167:            }
168:
169:            /**
170:             * Sets the idle check interval for the alarm.
171:             */
172:            public void updateIdleCheckInterval(long idleCheckInterval) {
173:                if (_idleCheckInterval > 0 && idleCheckInterval > 0
174:                        && idleCheckInterval < _idleCheckInterval) {
175:                    _idleCheckInterval = idleCheckInterval;
176:                    _alarm.queue(idleCheckInterval);
177:                }
178:
179:                if (_idleCheckInterval >= 0 && _idleCheckInterval < 1000)
180:                    _idleCheckInterval = 1000;
181:            }
182:
183:            /**
184:             * Sets the idle check interval for the alarm.
185:             */
186:            public long getIdleCheckTime() {
187:                if (_idleCheckInterval > 0)
188:                    return _idleCheckInterval;
189:                else
190:                    return _maxIdleTime;
191:            }
192:
193:            /**
194:             * Returns the length of time an idle object can remain in the store before
195:             * being cleaned.
196:             */
197:            public long getAccessWindowTime() {
198:                long window = _maxIdleTime / 4;
199:
200:                if (window < 60000L)
201:                    return 60000L;
202:                else
203:                    return window;
204:            }
205:
206:            //
207:            // statistics
208:            //
209:
210:            /**
211:             * Returns the objects in the store
212:             */
213:            public long getObjectCount() {
214:                return -1;
215:            }
216:
217:            /**
218:             * Returns the total objects loaded.
219:             */
220:            public long getLoadCount() {
221:                return _loadCount;
222:            }
223:
224:            /**
225:             * Returns the objects which failed to load.
226:             */
227:            public long getLoadFailCount() {
228:                return _loadFailCount;
229:            }
230:
231:            /**
232:             * Returns the total objects saved.
233:             */
234:            public long getSaveCount() {
235:                return _saveCount;
236:            }
237:
238:            /**
239:             * Returns the objects which failed to save.
240:             */
241:            public long getSaveFailCount() {
242:                return _saveFailCount;
243:            }
244:
245:            /**
246:             * Creates a Store.  The Store manages
247:             * persistent objects for a particular domain, like the sesions
248:             * for the /foo URL.
249:             *
250:             * @param storeId the persistent domain.
251:             */
252:            public Store createStore(String storeId, ObjectManager objectManager) {
253:                Store store = getStore(storeId);
254:
255:                store.setObjectManager(objectManager);
256:
257:                return store;
258:            }
259:
260:            /**
261:             * Removes a Store.  The Store manages
262:             * persistent objects for a particular domain, like the sesions
263:             * for the /foo URL.
264:             *
265:             * @param storeId the persistent domain.
266:             */
267:            public Store removeStore(String storeId) {
268:                Store store = getStore(storeId);
269:
270:                store.setObjectManager(null);
271:
272:                return store;
273:            }
274:
275:            /**
276:             * Creates a ClusterObjectManager.  The ClusterObjectManager manages
277:             * persistent objects for a particular domain, like the sesions
278:             * for the /foo URL.
279:             *
280:             * @param storeId the persistent domain.
281:             */
282:            public Store getStore(String storeId) {
283:                synchronized (_storeMap) {
284:                    Store store = _storeMap.get(storeId);
285:                    if (store == null) {
286:                        store = new Store(storeId, this );
287:                        _storeMap.put(storeId, store);
288:                    }
289:
290:                    return store;
291:                }
292:            }
293:
294:            /**
295:             * Called after any factory settings.
296:             */
297:            @PostConstruct
298:            public boolean init() throws Exception {
299:                if (!_lifecycle.toInit())
300:                    return false;
301:
302:                _lifecycle.setName(toString());
303:
304:                if (_cluster == null)
305:                    _cluster = Cluster.getLocal();
306:
307:                if (_cluster != null) {
308:                    _serverId = Cluster.getServerId();
309:                    ClusterServer selfServer = _cluster.getSelfServer();
310:
311:                    if (selfServer != null)
312:                        _selfIndex = selfServer.getIndex();
313:                    else if (_cluster.getServerList().length > 1) {
314:                        // XXX: error?
315:                        log
316:                                .warning(L
317:                                        .l(
318:                                                "cluster-store for '{0}' needs an <srun> configuration for it.",
319:                                                _serverId));
320:                    }
321:
322:                    ClusterServer[] serverList = _cluster.getServerList();
323:
324:                    _serverList = new ServerConnector[serverList.length];
325:
326:                    for (int i = 0; i < serverList.length; i++) {
327:                        _serverList[i] = serverList[i].getServerConnector();
328:                    }
329:                }
330:
331:                Environment.addEnvironmentListener(this );
332:
333:                return true;
334:            }
335:
336:            /**
337:             * Called to start the store.
338:             */
339:            public boolean start() throws Exception {
340:                if (!_lifecycle.toActive())
341:                    return false;
342:
343:                // notify the siblings that we're awake
344:                if (_serverList != null) {
345:                    ServerConnector[] serverList = _serverList;
346:
347:                    for (int i = 0; i < serverList.length; i++) {
348:                        ServerConnector server = serverList[i];
349:
350:                        if (server == null)
351:                            continue;
352:
353:                        try {
354:                            ClusterStream s = server.open();
355:                            s.close();
356:                        } catch (Throwable e) {
357:                        }
358:                    }
359:
360:                }
361:
362:                handleAlarm(_alarm);
363:
364:                return true;
365:            }
366:
367:            /**
368:             * Cleans old objects.  Living objects corresponding to the old
369:             * objects are not cleared, since their timeout should be less than
370:             * the store timeout.
371:             */
372:            public void clearOldObjects() throws Exception {
373:            }
374:
375:            /**
376:             * Returns true if this server is a primary for the given object id.
377:             */
378:            protected boolean isPrimary(String id) {
379:                return getPrimaryIndex(id, 0) == getSelfIndex();
380:            }
381:
382:            /**
383:             * Returns the owning index.
384:             */
385:            public int getPrimaryIndex(String id, int offset) {
386:                return 0;
387:            }
388:
389:            /**
390:             * Returns the backup index.
391:             */
392:            public int getSecondaryIndex(String id, int offset) {
393:                return 0;
394:            }
395:
396:            /**
397:             * Returns the backup index.
398:             */
399:            public int getTertiaryIndex(String id, int offset) {
400:                return 0;
401:            }
402:
403:            /**
404:             * Loads object access time.
405:             *
406:             * @param obj the object to update.
407:             */
408:            abstract protected boolean load(ClusterObject clusterObject,
409:                    Object obj) throws Exception;
410:
411:            /**
412:             * Updates the object's access time.
413:             *
414:             * @param storeId the identifier of the storage group
415:             * @param obj the object to update.
416:             */
417:            public void access(String uniqueId) throws Exception {
418:                ClusterObject obj = getClusterObject(uniqueId);
419:
420:                if (obj != null)
421:                    obj.access();
422:                else
423:                    accessImpl(uniqueId);
424:            }
425:
426:            /**
427:             * Updates the object's access time.
428:             *
429:             * @param storeId the identifier of the storage group
430:             * @param obj the object to update.
431:             */
432:            public void access(Store store, String id) throws Exception {
433:                getClusterObject(store, id).access();
434:            }
435:
436:            /**
437:             * Updates the object's access time in the persistent store.
438:             *
439:             * @param uniqueId the identifier of the object.
440:             */
441:            abstract public void accessImpl(String uniqueId) throws Exception;
442:
443:            /**
444:             * Sets the timef for the expires interval.
445:             *
446:             * @param uniqueId the identifier of the object.
447:             * @param long the time in ms for the expire
448:             */
449:            public void setExpireInterval(String uniqueId, long expires)
450:                    throws Exception {
451:            }
452:
453:            /**
454:             * When the object is no longer valid, remove it from the backing store.
455:             *
456:             * @param storeId the identifier of the storeage group
457:             * @param objectId the identifier of the object to remove
458:             */
459:            public void update(String storeId, String objectId)
460:                    throws Exception {
461:                ClusterObject obj = getClusterObject(storeId, objectId);
462:
463:                if (obj != null)
464:                    obj.update();
465:            }
466:
467:            /**
468:             * Updates the owner object.
469:             *
470:             * @param uniqueId the identifier of the storage group
471:             */
472:            public void updateOwner(String objectId, String uniqueId)
473:                    throws Exception {
474:
475:            }
476:
477:            /**
478:             * Saves the object to the cluster.
479:             *
480:             * @param storeId the identifier of the storage group
481:             * @param obj the object to store.
482:             */
483:            public void store(Store store, String id, Object obj)
484:                    throws IOException {
485:                ClusterObject clusterObj = getClusterObject(store, id);
486:
487:                if (clusterObj != null) {
488:                } else if (store.getObjectManager().isEmpty(obj))
489:                    return;
490:                else
491:                    clusterObj = createClusterObject(store, id);
492:
493:                clusterObj.store(obj);
494:            }
495:
496:            /**
497:             * Returns the cluster object.
498:             *
499:             * @param storeId the identifier of the storage group
500:             * @param obj the object to store.
501:             */
502:            ClusterObject createClusterObject(Store store, String id) {
503:                try {
504:                    String uniqueId = store.getId() + ';' + id;
505:
506:                    synchronized (this ) {
507:                        ClusterObject clusterObj = _clusterObjects
508:                                .get(uniqueId);
509:                        if (clusterObj == null) {
510:                            clusterObj = create(store, id);
511:                            _clusterObjects.put(clusterObj.getUniqueId(),
512:                                    clusterObj);
513:                        }
514:
515:                        return clusterObj;
516:                    }
517:                } catch (Exception e) {
518:                    log.log(Level.WARNING, e.toString(), e);
519:
520:                    return null;
521:                }
522:            }
523:
524:            /**
525:             * Returns the cluster object.
526:             *
527:             * @param storeId the identifier of the storage group
528:             * @param obj the object to store.
529:             */
530:            ClusterObject getClusterObject(Store store, String id) {
531:                return getClusterObject(makeUniqueId(store, id));
532:            }
533:
534:            /**
535:             * Returns the cluster object.
536:             *
537:             * @param storeId the identifier of the storage group
538:             * @param obj the object to store.
539:             */
540:            ClusterObject getClusterObject(String storeId, String id) {
541:                return getClusterObject(makeUniqueId(storeId, id));
542:            }
543:
544:            /**
545:             * Returns the cluster object.
546:             *
547:             * @param storeId the identifier of the storage group
548:             * @param obj the object to store.
549:             */
550:            ClusterObject getClusterObject(String uniqueId) {
551:                return _clusterObjects.get(uniqueId);
552:            }
553:
554:            /**
555:             * Returns the cluster object.
556:             *
557:             * @param storeId the identifier of the storage group
558:             * @param obj the object to store.
559:             */
560:            ClusterObject removeClusterObject(String storeId, String id) {
561:                synchronized (this ) {
562:                    return _clusterObjects.remove(makeUniqueId(storeId, id));
563:                }
564:            }
565:
566:            /**
567:             * Creates the cluster object.
568:             */
569:            ClusterObject create(Store store, String id) {
570:                return new ClusterObject(this , store, id);
571:            }
572:
573:            /**
574:             * Save the object to the store.
575:             *
576:             * @param storeId the identifier of the storage group
577:             * @param obj the object to store.
578:             */
579:            abstract protected void store(ClusterObject clusterObject,
580:                    TempStream tempStream, long crc) throws Exception;
581:
582:            /**
583:             * Handles a callback from an alarm, scheduling the timeout.
584:             */
585:            public void handleAlarm(Alarm alarm) {
586:                if (!_lifecycle.isActive())
587:                    return;
588:
589:                try {
590:                    clearOldObjects();
591:                } catch (Throwable e) {
592:                    log.log(Level.WARNING, e.toString(), e);
593:                } finally {
594:                    _alarm.queue(getIdleCheckTime());
595:                }
596:            }
597:
598:            /**
599:             * When the object is no longer valid, remove it from the backing store.
600:             *
601:             * @param obj the object to remove
602:             */
603:            public void remove(ClusterObject obj) throws Exception {
604:
605:            }
606:
607:            /**
608:             * When the object is no longer valid, remove it from the backing store.
609:             *
610:             * @param store the identifier of the storeage group
611:             * @param objectId the identifier of the object to remove
612:             */
613:            public void remove(Store store, String objectId) throws Exception {
614:            }
615:
616:            /**
617:             * Returns the unique id.
618:             */
619:            private String makeUniqueId(Store store, String objectId) {
620:                return store.getId() + ';' + objectId;
621:            }
622:
623:            /**
624:             * Returns the unique id.
625:             */
626:            private String makeUniqueId(String storeId, String objectId) {
627:                return storeId + ';' + objectId;
628:            }
629:
630:            /**
631:             * Returns the self servers.
632:             */
633:            protected int getSelfIndex() {
634:                return _selfIndex;
635:            }
636:
637:            /**
638:             * Returns the list of cluster servers.
639:             */
640:            protected ServerConnector[] getServerList() {
641:                return _serverList;
642:            }
643:
644:            /**
645:             * Returns the cluster server which owns the object
646:             */
647:            protected ServerConnector getOwningServer(String objectId) {
648:                if (_cluster == null)
649:                    return null;
650:
651:                char ch = objectId.charAt(0);
652:
653:                ServerConnector[] serverList = _serverList;
654:
655:                if (serverList.length > 0) {
656:                    int srunIndex = decode(ch) % serverList.length;
657:
658:                    return serverList[srunIndex];
659:                } else
660:                    return null;
661:            }
662:
663:            /**
664:             * Handles the case where the environment is activated.
665:             */
666:            public void environmentConfig(EnvironmentClassLoader loader) {
667:            }
668:
669:            /**
670:             * Handles the case where the environment is activated.
671:             */
672:            public void environmentStart(EnvironmentClassLoader loader) {
673:                try {
674:                    start();
675:                } catch (Exception e) {
676:                    log.log(Level.WARNING, e.toString(), e);
677:                }
678:            }
679:
680:            /**
681:             * Handles the case where the environment loader is stops
682:             */
683:            public void environmentStop(EnvironmentClassLoader loader) {
684:            }
685:
686:            /**
687:             * Handles the case where the environment is activated.
688:             */
689:            public void classLoaderInit(DynamicClassLoader loader) {
690:            }
691:
692:            /**
693:             * Handles the case where the environment loader is dropped.
694:             */
695:            public void classLoaderDestroy(DynamicClassLoader loader) {
696:                destroy();
697:            }
698:
699:            /**
700:             * Called at end of life.
701:             */
702:            public void destroy() {
703:                if (!_lifecycle.toDestroy())
704:                    return;
705:
706:                _alarm.dequeue();
707:            }
708:
709:            public String toString() {
710:                return getClass().getSimpleName() + "[" + _serverId + "]";
711:            }
712:
713:            static class ObjectKey {
714:                private String _storeId;
715:                private String _objectId;
716:
717:                ObjectKey() {
718:                }
719:
720:                ObjectKey(String storeId, String objectId) {
721:                    init(storeId, objectId);
722:                }
723:
724:                void init(String storeId, String objectId) {
725:                    _storeId = storeId;
726:                    _objectId = objectId;
727:                }
728:
729:                @Override
730:                public int hashCode() {
731:                    return _storeId.hashCode() * 65521 + _objectId.hashCode();
732:                }
733:
734:                @Override
735:                public boolean equals(Object o) {
736:                    if (this  == o)
737:                        return true;
738:                    else if (!(o instanceof  ObjectKey))
739:                        return false;
740:
741:                    ObjectKey key = (ObjectKey) o;
742:
743:                    return _objectId.equals(key._objectId)
744:                            && _storeId.equals(key._storeId);
745:                }
746:            }
747:
748:            static int decode(int code) {
749:                return DECODE[code & 0x7f];
750:            }
751:
752:            /**
753:             * Converts an integer to a printable character
754:             */
755:            private static char convert(long code) {
756:                code = code & 0x3f;
757:
758:                if (code < 26)
759:                    return (char) ('a' + code);
760:                else if (code < 52)
761:                    return (char) ('A' + code - 26);
762:                else if (code < 62)
763:                    return (char) ('0' + code - 52);
764:                else if (code == 62)
765:                    return '_';
766:                else
767:                    return '-';
768:            }
769:
770:            static {
771:                DECODE = new int[128];
772:                for (int i = 0; i < 64; i++)
773:                    DECODE[(int) convert(i)] = i;
774:            }
775:        }
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