Source Code Cross Referenced for MemoryInstanceManagerImpl.java in  » Database-ORM » Speedo_1.4.5 » org » objectweb » speedo » mim » lib » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database ORM » Speedo_1.4.5 » org.objectweb.speedo.mim.lib 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /**
002:         * Copyright (C) 2001-2004 France Telecom R&D
003:         *
004:         * This library is free software; you can redistribute it and/or
005:         * modify it under the terms of the GNU Lesser General Public
006:         * License as published by the Free Software Foundation; either
007:         * version 2 of the License, or (at your option) any later version.
008:         *
009:         * This library is distributed in the hope that it will be useful,
010:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
011:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
012:         * Lesser General Public License for more details.
013:         *
014:         * You should have received a copy of the GNU Lesser General Public
015:         * License along with this library; if not, write to the Free Software
016:         * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
017:         */package org.objectweb.speedo.mim.lib;
018:
019:        import org.objectweb.fractal.api.control.BindingController;
020:        import org.objectweb.jorm.api.PClassMapping;
021:        import org.objectweb.jorm.api.PException;
022:        import org.objectweb.jorm.lib.JormPathHelper;
023:        import org.objectweb.jorm.naming.api.PBinder;
024:        import org.objectweb.jorm.naming.api.PName;
025:        import org.objectweb.jorm.naming.api.PNameManager;
026:        import org.objectweb.jorm.type.api.PType;
027:        import org.objectweb.jorm.util.api.Loggable;
028:        import org.objectweb.perseus.cache.api.CacheEntry;
029:        import org.objectweb.perseus.cache.api.CacheEntryFactory;
030:        import org.objectweb.perseus.cache.api.CacheEvent;
031:        import org.objectweb.perseus.cache.api.FixableCacheEntry;
032:        import org.objectweb.perseus.persistence.api.ConnectionHolder;
033:        import org.objectweb.perseus.persistence.api.MemoryInstanceManager;
034:        import org.objectweb.perseus.persistence.api.PersistenceException;
035:        import org.objectweb.perseus.persistence.api.State;
036:        import org.objectweb.perseus.persistence.api.StateManager;
037:        import org.objectweb.speedo.api.ExceptionHelper;
038:        import org.objectweb.speedo.api.SpeedoRuntimeException;
039:        import org.objectweb.speedo.genclass.AbstractGenClassHome;
040:        import org.objectweb.speedo.genclass.SupportedGenClass;
041:        import org.objectweb.speedo.genclass.api.SpeedoGenClassPO;
042:        import org.objectweb.speedo.lib.Personality;
043:        import org.objectweb.speedo.mapper.api.JormFactory;
044:        import org.objectweb.speedo.mim.api.LifeCycle;
045:        import org.objectweb.speedo.mim.api.MemoryInstanceManagerAttribute;
046:        import org.objectweb.speedo.mim.api.StateItf;
047:        import org.objectweb.speedo.mim.api.HomeItf;
048:        import org.objectweb.speedo.mim.api.PersistentObjectItf;
049:        import org.objectweb.util.monolog.api.BasicLevel;
050:        import org.objectweb.util.monolog.api.Logger;
051:
052:        import java.util.Collections;
053:        import java.util.HashMap;
054:        import java.util.Iterator;
055:        import java.util.Map;
056:        import java.util.StringTokenizer;
057:
058:        import javax.jdo.listener.InstanceLifecycleEvent;
059:
060:        /**
061:         * This class is an implementation of the MemoryInstanceManager provided by the
062:         * persistence framwork availlable in perseus. This implementation depends on
063:         * the identifier used, and the way to instanciate user objects. This
064:         * implementation supports only the jorm object identifier: PName.
065:         * This implementation supports also the instanciation of the Jorm generic
066:         * class. To do this it is needed to specify for each jorm generic class used
067:         * the name of the class which must be instanciated. This configuration is done
068:         * via the GenClassNames attribute.
069:         * This implementation does not used a pool, then the instance are created at
070:         * each newInstance call.
071:         *
072:         * @author S.Chassande-Barrioz
073:         */
074:        public class MemoryInstanceManagerImpl implements 
075:                MemoryInstanceManager, MemoryInstanceManagerAttribute,
076:                StateManager, CacheEntryFactory, BindingController {
077:
078:            public final static String JORM_FACTORY_BINDING = "jorm-factory";
079:
080:            /**
081:             * This fields maintains the association between the name of the Jorm
082:             * generic class and the class name which must be implemented.
083:             */
084:            private Map name2gcimpl = null;
085:
086:            protected JormFactory jf = null;
087:
088:            protected Personality personality;
089:
090:            protected Logger logger = null;
091:
092:            public MemoryInstanceManagerImpl() {
093:                name2gcimpl = Collections.EMPTY_MAP;
094:            }
095:
096:            private String getGCClassName(String cn) {
097:                String res = (String) name2gcimpl.get(cn);
098:                if (res != null) {
099:                    return res;
100:                }
101:                for (int i = 0; i < SupportedGenClass.GC_IMPL.length; i++) {
102:                    if (SupportedGenClass.GC_IMPL[i][0].equals(cn)) {
103:                        return personality
104:                                .getGenClassName(SupportedGenClass.GC_IMPL[i][1]);
105:                    }
106:                }
107:                return null;
108:            }
109:
110:            /**
111:             * Active a persistent object :
112:             * - assign the PClassMapping
113:             * - assign a Pbinding for the SpeedoGenClassPO
114:             *
115:             * @param sp is PersistentObjectItf or a SpeedoGenClassPO instance, the
116:             * persistent object
117:             * @param pn the identifier of the object
118:             */
119:            private void activePO(PersistentObjectItf sp, PName pn) {
120:                //fetch the PClassMapping
121:                PClassMapping pcm = null;
122:                if (pn != null && (pn.getPNameManager() instanceof  PBinder)) {
123:                    pcm = ((PBinder) pn.getPNameManager())
124:                            .getBinderClassMapping();
125:                }
126:                if (sp instanceof  SpeedoGenClassPO) {
127:                    if (((SpeedoGenClassPO) sp).speedoGetPBinding() == null) {
128:                        if (pcm == null) {
129:                            pcm = jf.getGenClassMapping(((SpeedoGenClassPO) sp)
130:                                    .speedoGetGenClassId());
131:                        }
132:                        //Assign the PBinding
133:                        try {
134:                            ((SpeedoGenClassPO) sp).speedoSetPBinding(pcm
135:                                    .createPBinding());
136:                        } catch (PException e) {
137:                            throw personality
138:                                    .newRuntimeException(
139:                                            "Impossible to initialize the delegate PBinding of the genclass",
140:                                            e);
141:                        }
142:                        if (sp instanceof  Loggable) {
143:                            ((Loggable) sp).setLogger(logger);
144:                        }
145:                    }
146:                } else {
147:                    if (pcm == null) {
148:                        try {
149:                            pcm = jf.getPClassMapping(sp.getClass());
150:                        } catch (PException e) {
151:                            throw personality.newRuntimeException(
152:                                    "Impossible to initialize a class", e);
153:                        }
154:                    }
155:                    if (sp.getPClassMapping() == null) {
156:                        //Assign the PClassMapping
157:                        try {
158:                            sp.init(pcm);
159:                        } catch (PException e) {
160:                            Exception ie = ExceptionHelper.getNested(e);
161:                            if (logger != null)
162:                                logger.log(BasicLevel.ERROR,
163:                                        "Impossible to init the persistent class: "
164:                                                + sp.getClass().getName(), ie);
165:                            throw personality
166:                                    .newRuntimeException("Impossible to init the persistent class:"
167:                                            + ie.getMessage());
168:                        }
169:                    }
170:                }
171:                //Mark as active
172:                sp.speedoIsActive(true);
173:                if (logger != null && logger.isLoggable(BasicLevel.DEBUG))
174:                    logger.log(BasicLevel.DEBUG, "PO activated: "
175:                            + sp.getClass().getName());
176:            }
177:
178:            private HomeItf getHome(Object o) {
179:                if (o == null) {
180:                    logger.log(BasicLevel.WARN,
181:                            "Impossible to find the home: null object");
182:                    return null;
183:                } else if (o instanceof  PersistentObjectItf) {
184:                    PersistentObjectItf po = (PersistentObjectItf) o;
185:                    HomeItf h = po.speedoGetHome();
186:                    if (h == null) {
187:                        if (o instanceof  SpeedoGenClassPO) {
188:                            PName pn = po.getPName();
189:                            if (pn == null) {
190:                                h = (HomeItf) ((PBinder) pn.getPNameManager())
191:                                        .getBinderClassMapping();
192:                            } else {
193:                                h = (HomeItf) jf
194:                                        .getGenClassMapping(((SpeedoGenClassPO) po)
195:                                                .speedoGetGenClassId());
196:                            }
197:                        } else {
198:                            try {
199:                                h = (HomeItf) jf.getPClassMapping(o.getClass());
200:                            } catch (PException e) {
201:                                throw new SpeedoRuntimeException(e);
202:                            }
203:                        }
204:                    }
205:                    if (h == null) {
206:                        logger.log(BasicLevel.WARN,
207:                                "Impossible to find the home");
208:                    }
209:                    return h;
210:                } else if (o instanceof  PName) {
211:                    PName pn = (PName) o;
212:                    PNameManager pnm = pn.getPNameManager();
213:                    while (!(pnm instanceof  PBinder)) {
214:                        PName npn;
215:                        try {
216:                            npn = pn.resolve(null);
217:                        } catch (PException e) {
218:                            logger.log(BasicLevel.WARN,
219:                                    "Impossible to find the home from the PName "
220:                                            + pn, e);
221:                            return null;
222:                        }
223:                        if (npn == pn) {
224:                            logger.log(BasicLevel.WARN,
225:                                    "Impossible to find the home from the PName "
226:                                            + pn + " : cycle");
227:                            return null;
228:                        } else {
229:                            pnm = pn.getPNameManager();
230:                        }
231:                    }
232:                    return (HomeItf) ((PBinder) pnm).getBinderClassMapping();
233:                } else {
234:                    logger.log(BasicLevel.WARN,
235:                            "No home found with this object: " + o.getClass());
236:                    return null;
237:                }
238:            }
239:
240:            // IMPLEMENTATION OF THE MemoryInstanceManagerAttribute INTERFACE //
241:            //----------------------------------------------------------------------//
242:            public String[] listFc() {
243:                return new String[] { JORM_FACTORY_BINDING };
244:            }
245:
246:            public Object lookupFc(String s) {
247:                if (JORM_FACTORY_BINDING.equals(s)) {
248:                    return jf;
249:                } else {
250:                    return null;
251:                }
252:            }
253:
254:            public void bindFc(String s, Object o) {
255:                if (JORM_FACTORY_BINDING.equals(s)) {
256:                    jf = (JormFactory) o;
257:                } else if ("logger".equals(s)) {
258:                    logger = (Logger) o;
259:                }
260:            }
261:
262:            public void unbindFc(String s) {
263:                if (JORM_FACTORY_BINDING.equals(s)) {
264:                    jf = null;
265:                }
266:            }
267:
268:            // IMPLEMENTATION OF THE MemoryInstanceManagerAttribute INTERFACE //
269:            //----------------------------------------------------------------------//
270:
271:            /**
272:             * @return a String describing the genclass names with the following format:
273:             * "(jorm_name,java_name),(jorm_name,java_name),(jorm_name,java_name)}"
274:             */
275:            public String getGenClassNames() {
276:                if (name2gcimpl == null || name2gcimpl.size() == 0)
277:                    return "{}";
278:                StringBuffer res = new StringBuffer("");
279:                boolean first = true;
280:                for (Iterator it = name2gcimpl.entrySet().iterator(); it
281:                        .hasNext();) {
282:                    if (first) {
283:                        res.append("{");
284:                        first = false;
285:                    } else
286:                        res.append(",");
287:                    res.append("(");
288:                    Map.Entry me = (Map.Entry) it.next();
289:                    res.append(me.getKey());
290:                    res.append(",");
291:                    res.append(me.getValue());
292:                    res.append(")");
293:                }
294:                res.append("}");
295:                return res.toString();
296:            }
297:
298:            /**
299:             * It assignes a description of the gen class names.
300:             * @param gcname is the desciption which must follow this format:
301:             * "(jorm_name,java_name),(jorm_name,java_name),(jorm_name,java_name)}"
302:             */
303:            public void setGenClassNames(String gcname) {
304:                if (gcname == null || gcname.length() == 0)
305:                    name2gcimpl = Collections.EMPTY_MAP;
306:                name2gcimpl = new HashMap(5);
307:                StringTokenizer st = new StringTokenizer(gcname, "{,()}:;[]",
308:                        false);
309:                String key = null;
310:                while (st.hasMoreTokens()) {
311:                    if (key == null) {
312:                        key = st.nextToken().trim();
313:                    } else {
314:                        name2gcimpl.put(key, st.nextToken().trim());
315:                    }
316:                }
317:            }
318:
319:            public Personality getPersonality() {
320:                return personality;
321:            }
322:
323:            public void setPersonality(Personality p) {
324:                this .personality = p;
325:            }
326:
327:            // IMPLEMENTATION OF THE MemoryInstanceManager INTERFACE //
328:            //-------------------------------------------------------//
329:
330:            /**
331:             * It creates an instance since an identifier
332:             * @param oid is the identifier of the futur object
333:             * @return a memory instance
334:             */
335:            public Object newInstance(Object oid, ConnectionHolder context)
336:                    throws PersistenceException {
337:                if (!(oid instanceof  PName))
338:                    throw new PersistenceException(
339:                            "Unmanaged object identifier: " + oid);
340:                PName pn = (PName) oid;
341:                String className = null;
342:                try {
343:                    pn = pn.resolve(context);
344:                    if (logger.isLoggable(BasicLevel.DEBUG)) {
345:                        logger.log(BasicLevel.DEBUG, "newInstance(" + oid
346:                                + "): pn.resolve=" + pn);
347:                        logger.log(BasicLevel.DEBUG, "newInstance(" + oid
348:                                + "): pn.type=" + pn.getPType());
349:                    }
350:                    PType type = pn.getPType();
351:                    if (type == null) {
352:                        //Error detected by Roland Hedayat
353:                        throw new PersistenceException("newInstance() "
354:                                + "\n\toid="
355:                                + oid
356:                                + "\n\tpn="
357:                                + pn
358:                                + "\n\tpn.pnc="
359:                                + (pn.getPNameManager() != null ? pn
360:                                        .getPNameManager() : null));
361:                    }
362:                    className = type.getJormName();
363:                    int idx = className.indexOf(JormPathHelper.SEP);
364:                    PClassMapping pcm = ((PBinder) pn.getPNameManager())
365:                            .getBinderClassMapping();
366:                    PersistentObjectItf sp = null;
367:                    if ((pcm instanceof  AbstractGenClassHome) && idx != -1) {
368:                        // This is a Generic class
369:                        className = getGCClassName(className.substring(0, idx));
370:                        sp = (PersistentObjectItf) Class.forName(className)
371:                                .newInstance();
372:                    } else {
373:                        if (pcm != null) {
374:                            className = pcm.getClassName();
375:                        }
376:                        ClassLoader cl = jf.getClassLoader(className);
377:                        if (cl == null) {
378:                            cl = oid.getClass().getClassLoader();
379:                            if (cl == null) {
380:                                cl = ClassLoader.getSystemClassLoader();
381:                            }
382:                        }
383:                        sp = (PersistentObjectItf) cl.loadClass(className)
384:                                .newInstance();
385:                    }
386:                    sp.speedoSetReferenceState(null);
387:                    return sp;
388:                } catch (PException e) {
389:                    throw new PersistenceException(
390:                            "Impossible to analyze the object identifier" + oid,
391:                            e);
392:                } catch (Exception e) {
393:                    throw new PersistenceException(
394:                            "Impossible to instanciate the class "
395:                                    + className
396:                                    + "Be careful to the generic class (Collection, ...), oid class:"
397:                                    + oid.getClass(), e);
398:                }
399:            }
400:
401:            public boolean isObjectSharing(Object o) {
402:                HomeItf home = getHome(o);
403:                return home == null || home.isShareable();
404:            }
405:
406:            // IMPLEMENTATION OF THE StateManager INTERFACE //
407:            //----------------------------------------------//
408:            public State createState(CacheEntry ce) {
409:                return ((PersistentObjectItf) ce).speedoCreateState();
410:            }
411:
412:            public State createState(State s) {
413:                PersistentObjectItf sp = (PersistentObjectItf) s
414:                        .getCacheEntry();
415:                StateItf sa = sp.speedoCreateState();
416:                sp.speedoCopyState(((StateItf) s), sa);
417:                return sa;
418:            }
419:
420:            public State getReferenceState(CacheEntry ce) {
421:                return ((PersistentObjectItf) ce).speedoGetReferenceState();
422:            }
423:
424:            public void destroyState(State state) {
425:                //nothing to do
426:            }
427:
428:            public void makeUnexported(State state) {
429:                ((StateItf) state)
430:                        .speedoChangeStatus(LifeCycle.ACTION_DELETEPERSISTENT);
431:            }
432:
433:            public boolean isUnexported(State state) {
434:                return LifeCycle
435:                        .isDeleted(((StateItf) state).speedoGetStatus());
436:            }
437:
438:            public void makeExported(State state) {
439:                ((StateItf) state)
440:                        .speedoChangeStatus(LifeCycle.ACTION_MAKEPERSISTENT);
441:            }
442:
443:            public boolean isExported(State state) {
444:                return LifeCycle.isNew(((StateItf) state).speedoGetStatus());
445:            }
446:
447:            public void makeDirty(State state) {
448:                ((StateItf) state)
449:                        .speedoChangeStatus(LifeCycle.ACTION_WRITEFIELD_ACTIVEDATASTORETRANSACTION);
450:                ((StateItf) state).setFlushed(false);
451:            }
452:
453:            public boolean isDirty(State state) {
454:                return LifeCycle.isDirty(((StateItf) state).speedoGetStatus());
455:            }
456:
457:            public void setReferenceState(CacheEntry ce, State state) {
458:                if (state == ((PersistentObjectItf) ce)
459:                        .speedoGetReferenceState()) {
460:                    return;
461:                }
462:                PersistentObjectItf sp = (PersistentObjectItf) ce;
463:                if (sp.speedoIsActive() && state == null) {
464:                    sp.speedoGetHome().sendEvent(HomeItf.PRE_CLEAR, sp, null);
465:                }
466:                sp.speedoSetReferenceState((StateItf) state);
467:                if (sp.speedoIsActive() && state == null) {
468:                    sp.speedoGetHome().sendEvent(HomeItf.POST_CLEAR, sp, null);
469:                }
470:            }
471:
472:            public void makeClean(State state) {
473:                StateItf sa = (StateItf) state;
474:                sa.speedoSetStatus(LifeCycle.PERSISTENT_CLEAN);
475:            }
476:
477:            public void makeFlushed(State state) {
478:                ((StateItf) state).setFlushed(true);
479:            }
480:
481:            public boolean isFlushed(State state) {
482:                return ((StateItf) state).hasBeenFlush();
483:            }
484:
485:            public void makeUnbound(CacheEntry ce) {
486:                PersistentObjectItf sp = (PersistentObjectItf) ce;
487:                sp.speedoIsActive(false);
488:                try {
489:                    sp.init(null);
490:                } catch (PException e) {
491:                    logger.log(BasicLevel.WARN, "Error during the unbinding: ",
492:                            e);
493:                }
494:            }
495:
496:            public void makeBound(CacheEntry ce, Object oid) {
497:                PName pname = (PName) oid;
498:                PersistentObjectItf sp = (PersistentObjectItf) ce;
499:                try {
500:                    sp.bind(pname);
501:                } catch (PException e) {
502:                    logger
503:                            .log(BasicLevel.WARN, "Error during the binding: ",
504:                                    e);
505:                }
506:            }
507:
508:            public boolean isBound(CacheEntry ce) {
509:                return ((PersistentObjectItf) ce).speedoIsActive();
510:            }
511:
512:            public boolean isToMerge(State state) {
513:                return ((StateItf) state).isToMerge();
514:            }
515:
516:            public void makeToMerge(State state, Object thinLock) {
517:                ((StateItf) state).makeToMerge(thinLock);
518:            }
519:
520:            public State merge(State oldState, State newState) {
521:                return ((StateItf) newState).merge(oldState);
522:            }
523:
524:            public void stateNoMoreUsed(State state) {
525:                ((StateItf) state).unSwizzle();
526:            }
527:
528:            // IMPLEMENTATION OF THE CacheEventListener INTERFACE //
529:            //----------------------------------------------------//
530:
531:            /**
532:             * @param event
533:             */
534:            public void entryBound(CacheEvent event) {
535:            }
536:
537:            /**
538:             * @param event
539:             */
540:            public void entryUnbound(CacheEvent event) {
541:                if (logger.isLoggable(BasicLevel.DEBUG)) {
542:                    logger.log(BasicLevel.DEBUG,
543:                            "Entry unbound from the cache: \n\tid: "
544:                                    + event.getCeIdentifier());
545:                }
546:                PName pn = (PName) event.getCeIdentifier();
547:                HomeItf sh = (HomeItf) ((PBinder) pn.getPNameManager())
548:                        .getBinderClassMapping();
549:                sh.userCacheEntryUnbound(pn);
550:            }
551:
552:            // IMPLEMENTATION OF THE CacheEntryFactory INTERFACE //
553:            //---------------------------------------------------//
554:
555:            public int getCachingStrategy(Object o) {
556:                HomeItf home = getHome(o);
557:                if (home == null) {
558:                    return CACHING_STRATEGY_CACHED;
559:                } else {
560:                    return home.isCacheable() ? CACHING_STRATEGY_CACHED
561:                            : CACHING_STRATEGY_NO_CACHE;
562:                }
563:            }
564:
565:            /**
566:             * binds the PersistentObjectItf to its identifier (PName) if it does not have
567:             * already one.
568:             * @param id is the PName of the PersistentObjectItf
569:             * @param obj is the PersistentObjectItf instance added into the cache
570:             * @return the PersistentObjectItf instance
571:             */
572:            public FixableCacheEntry create(Object id, Object obj) {
573:                PersistentObjectItf sp = (PersistentObjectItf) obj;
574:                PName pn = (PName) id;
575:                activePO(sp, pn);
576:                if (sp.getPName() == null || sp.getPName().isNull()) {
577:                    try {
578:                        pn.resolve(null);
579:                        sp.bind(pn);
580:                    } catch (PException e) {
581:                        throw personality
582:                                .newRuntimeException(
583:                                        "Impossible to bind the po to its persistent name: ",
584:                                        e);
585:                    }
586:                }
587:                /**
588:                 * else the entry is a new persistent object, the export created an
589:                 * identifier
590:                 */
591:                return (FixableCacheEntry) obj;
592:            }
593:        }
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