Source Code Cross Referenced for RegistryImpl.java in  » Library » Tapestry » org » apache » tapestry » ioc » internal » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Tapestry » org.apache.tapestry.ioc.internal 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // Copyright 2006, 2007 The Apache Software Foundation
002:        //
003:        // Licensed under the Apache License, Version 2.0 (the "License");
004:        // you may not use this file except in compliance with the License.
005:        // You may obtain a copy of the License at
006:        //
007:        //     http://www.apache.org/licenses/LICENSE-2.0
008:        //
009:        // Unless required by applicable law or agreed to in writing, software
010:        // distributed under the License is distributed on an "AS IS" BASIS,
011:        // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012:        // See the License for the specific language governing permissions and
013:        // limitations under the License.
014:
015:        package org.apache.tapestry.ioc.internal;
016:
017:        import static org.apache.tapestry.ioc.internal.util.CollectionFactory.newCaseInsensitiveMap;
018:        import static org.apache.tapestry.ioc.internal.util.CollectionFactory.newList;
019:        import static org.apache.tapestry.ioc.internal.util.CollectionFactory.newMap;
020:        import static org.apache.tapestry.ioc.internal.util.Defense.notNull;
021:
022:        import java.lang.reflect.Constructor;
023:        import java.lang.reflect.InvocationTargetException;
024:        import java.util.Collection;
025:        import java.util.Collections;
026:        import java.util.List;
027:        import java.util.Map;
028:        import java.util.Set;
029:
030:        import org.apache.commons.logging.Log;
031:        import org.apache.tapestry.ioc.AnnotationProvider;
032:        import org.apache.tapestry.ioc.Configuration;
033:        import org.apache.tapestry.ioc.IOCConstants;
034:        import org.apache.tapestry.ioc.LogSource;
035:        import org.apache.tapestry.ioc.MappedConfiguration;
036:        import org.apache.tapestry.ioc.ObjectLocator;
037:        import org.apache.tapestry.ioc.ObjectProvider;
038:        import org.apache.tapestry.ioc.OrderedConfiguration;
039:        import org.apache.tapestry.ioc.Registry;
040:        import org.apache.tapestry.ioc.ServiceDecorator;
041:        import org.apache.tapestry.ioc.ServiceLifecycle;
042:        import org.apache.tapestry.ioc.ServiceResources;
043:        import org.apache.tapestry.ioc.def.ContributionDef;
044:        import org.apache.tapestry.ioc.def.DecoratorDef;
045:        import org.apache.tapestry.ioc.def.ModuleDef;
046:        import org.apache.tapestry.ioc.def.ServiceDef;
047:        import org.apache.tapestry.ioc.internal.services.RegistryShutdownHubImpl;
048:        import org.apache.tapestry.ioc.internal.services.ThreadCleanupHubImpl;
049:        import org.apache.tapestry.ioc.internal.util.InternalUtils;
050:        import org.apache.tapestry.ioc.internal.util.OneShotLock;
051:        import org.apache.tapestry.ioc.internal.util.Orderer;
052:        import org.apache.tapestry.ioc.services.ClassFab;
053:        import org.apache.tapestry.ioc.services.ClassFactory;
054:        import org.apache.tapestry.ioc.services.RegistryShutdownHub;
055:        import org.apache.tapestry.ioc.services.RegistryShutdownListener;
056:        import org.apache.tapestry.ioc.services.ServiceLifecycleSource;
057:        import org.apache.tapestry.ioc.services.SymbolSource;
058:        import org.apache.tapestry.ioc.services.TapestryIOCModule;
059:        import org.apache.tapestry.ioc.services.ThreadCleanupHub;
060:
061:        public class RegistryImpl implements  Registry, InternalRegistry {
062:            private static final String SYMBOL_SOURCE_SERVICE_ID = "SymbolSource";
063:
064:            private static final String REGISTRY_SHUTDOWN_HUB_SERVICE_ID = "RegistryShutdownHub";
065:
066:            static final String THREAD_CLEANUP_HUB_SERVICE_ID = "ThreadCleanupHub";
067:
068:            /**
069:             * Used to obtain the {@link org.apache.tapestry.ioc.services.ClassFactory} service, which is
070:             * crucial when creating runtime classes for proxies and the like.
071:             */
072:            static final String CLASS_FACTORY_SERVICE_ID = "ClassFactory";
073:
074:            static final String LOG_SOURCE_SERVICE_ID = "LogSource";
075:
076:            private final OneShotLock _lock = new OneShotLock();
077:
078:            private final OneShotLock _eagerLoadLock = new OneShotLock();
079:
080:            private final Map<String, Object> _builtinServices = newCaseInsensitiveMap();
081:
082:            private final Map<String, Class> _builtinTypes = newCaseInsensitiveMap();
083:
084:            private final RegistryShutdownHubImpl _registryShutdownHub;
085:
086:            private final LogSource _logSource;
087:
088:            /** Map from service id to the Module that contains the service. */
089:            private final Map<String, Module> _serviceIdToModule = newCaseInsensitiveMap();
090:
091:            private final Map<String, ServiceLifecycle> _lifecycles = newCaseInsensitiveMap();
092:
093:            private final ThreadCleanupHubImpl _cleanupHub;
094:
095:            private final ClassFactory _classFactory;
096:
097:            private SymbolSource _symbolSource;
098:
099:            private final List<Module> _modules = newList();
100:
101:            public static final class OrderedConfigurationToOrdererAdaptor<T>
102:                    implements  OrderedConfiguration<T> {
103:                private final Orderer<T> _orderer;
104:
105:                public OrderedConfigurationToOrdererAdaptor(Orderer<T> orderer) {
106:                    _orderer = orderer;
107:                }
108:
109:                public void add(String id, T object, String... constraints) {
110:                    _orderer.add(id, object, constraints);
111:                }
112:            }
113:
114:            /**
115:             * Constructs the registry from a set of module definitions and other resources.
116:             * 
117:             * @param moduleDefs
118:             *            defines the modules (and builders, decorators, etc., within)
119:             * @param classFactory
120:             *            TODO
121:             * @param logSource
122:             *            used to obtain Log instances
123:             */
124:            public RegistryImpl(Collection<ModuleDef> moduleDefs,
125:                    ClassFactory classFactory, LogSource logSource) {
126:                _logSource = logSource;
127:
128:                for (ModuleDef def : moduleDefs) {
129:                    Log log = _logSource.getLog(def.getLogName());
130:
131:                    Module module = new ModuleImpl(this , def, classFactory, log);
132:
133:                    _modules.add(module);
134:
135:                    for (String serviceId : def.getServiceIds()) {
136:                        Module existing = _serviceIdToModule.get(serviceId);
137:
138:                        if (existing != null)
139:                            throw new RuntimeException(IOCMessages
140:                                    .serviceIdConflict(serviceId, existing
141:                                            .getServiceDef(serviceId), module
142:                                            .getServiceDef(serviceId)));
143:
144:                        _serviceIdToModule.put(serviceId, module);
145:                    }
146:                }
147:
148:                addBuiltin(LOG_SOURCE_SERVICE_ID, LogSource.class, _logSource);
149:
150:                _classFactory = classFactory;
151:
152:                addBuiltin(CLASS_FACTORY_SERVICE_ID, ClassFactory.class,
153:                        _classFactory);
154:
155:                Log log = logForBuiltinService(THREAD_CLEANUP_HUB_SERVICE_ID);
156:
157:                _cleanupHub = new ThreadCleanupHubImpl(log);
158:
159:                addBuiltin(THREAD_CLEANUP_HUB_SERVICE_ID,
160:                        ThreadCleanupHub.class, _cleanupHub);
161:
162:                log = logForBuiltinService(REGISTRY_SHUTDOWN_HUB_SERVICE_ID);
163:
164:                _registryShutdownHub = new RegistryShutdownHubImpl(log);
165:
166:                addBuiltin(REGISTRY_SHUTDOWN_HUB_SERVICE_ID,
167:                        RegistryShutdownHub.class, _registryShutdownHub);
168:
169:                _lifecycles.put("singleton", new SingletonServiceLifecycle());
170:            }
171:
172:            /**
173:             * It's not unreasonable for an eagerly-loaded service to decide to start a thread, at which
174:             * point we raise issues about improper publishing of the Registry instance from the
175:             * RegistryImpl constructor. Moving eager loading of services out to its own method should
176:             * ensure thread safety.
177:             */
178:            public void eagerLoadServices() {
179:                _eagerLoadLock.lock();
180:
181:                for (Module m : _modules)
182:                    m.eagerLoadServices();
183:
184:                cleanupThread();
185:            }
186:
187:            public Log logForService(String serviceId) {
188:                Module module = _serviceIdToModule.get(serviceId);
189:
190:                assert module != null;
191:
192:                return _logSource.getLog(module.getLogName() + "." + serviceId);
193:            }
194:
195:            private Log logForBuiltinService(String serviceId) {
196:                return _logSource.getLog(TapestryIOCModule.class + "."
197:                        + serviceId);
198:            }
199:
200:            private <T> void addBuiltin(String serviceId,
201:                    Class<T> serviceInterface, T service) {
202:                _builtinTypes.put(serviceId, serviceInterface);
203:                _builtinServices.put(serviceId, service);
204:            }
205:
206:            public synchronized void shutdown() {
207:                _lock.lock();
208:
209:                _registryShutdownHub.fireRegistryDidShutdown();
210:            }
211:
212:            /** Internal access, usually from another module. */
213:            public <T> T getService(String serviceId, Class<T> serviceInterface) {
214:                _lock.check();
215:
216:                T result = checkForBuiltinService(serviceId, serviceInterface);
217:                if (result != null)
218:                    return result;
219:
220:                // Checking serviceId and serviceInterface is overkill; they have been checked and rechecked
221:                // all the way to here.
222:
223:                Module containingModule = locateModuleForService(serviceId);
224:
225:                return containingModule.getService(serviceId, serviceInterface);
226:            }
227:
228:            private <T> T checkForBuiltinService(String serviceId,
229:                    Class<T> serviceInterface) {
230:                Object service = _builtinServices.get(serviceId);
231:
232:                if (service == null)
233:                    return null;
234:
235:                try {
236:                    return serviceInterface.cast(service);
237:                } catch (ClassCastException ex) {
238:                    throw new RuntimeException(IOCMessages
239:                            .serviceWrongInterface(serviceId, _builtinTypes
240:                                    .get(serviceId), serviceInterface));
241:                }
242:            }
243:
244:            public void cleanupThread() {
245:                _lock.check();
246:
247:                _cleanupHub.cleanup();
248:            }
249:
250:            private Module locateModuleForService(String serviceId) {
251:                Module module = _serviceIdToModule.get(serviceId);
252:
253:                if (module == null)
254:                    throw new RuntimeException(IOCMessages.noSuchService(
255:                            serviceId, _serviceIdToModule.keySet()));
256:
257:                return module;
258:            }
259:
260:            public <T> Collection<T> getUnorderedConfiguration(
261:                    ServiceDef serviceDef, Class<T> objectType) {
262:                _lock.check();
263:
264:                final Collection<T> result = newList();
265:
266:                Configuration<T> configuration = new Configuration<T>() {
267:                    public void add(T object) {
268:                        result.add(object);
269:                    }
270:                };
271:
272:                Collection<Module> modules = _modules;
273:
274:                for (Module m : modules)
275:                    addToUnorderedConfiguration(configuration, objectType,
276:                            serviceDef, m);
277:
278:                return result;
279:            }
280:
281:            public <T> List<T> getOrderedConfiguration(ServiceDef serviceDef,
282:                    Class<T> objectType) {
283:                _lock.check();
284:
285:                Log log = null;
286:
287:                final Orderer<T> orderer = new Orderer<T>(log);
288:
289:                OrderedConfiguration<T> configuration = new OrderedConfigurationToOrdererAdaptor<T>(
290:                        orderer);
291:
292:                Collection<Module> modules = _modules;
293:
294:                for (Module m : modules)
295:                    addToOrderedConfiguration(configuration, objectType,
296:                            serviceDef, m);
297:
298:                return orderer.getOrdered();
299:            }
300:
301:            public <K, V> Map<K, V> getMappedConfiguration(
302:                    ServiceDef serviceDef, Class<K> keyType, Class<V> objectType) {
303:                _lock.check();
304:
305:                // When the key type is String, then a case insensitive map is used for both cases.
306:
307:                final Map<K, V> result = newConfigurationMap(keyType);
308:                Map<K, ContributionDef> keyToContribution = newConfigurationMap(keyType);
309:
310:                MappedConfiguration<K, V> configuration = new MappedConfiguration<K, V>() {
311:                    public void add(K key, V value) {
312:                        result.put(key, value);
313:                    }
314:                };
315:
316:                Collection<Module> modules = _modules;
317:
318:                for (Module m : modules)
319:                    addToMappedConfiguration(configuration, keyToContribution,
320:                            keyType, objectType, serviceDef, m);
321:
322:                return result;
323:            }
324:
325:            @SuppressWarnings("unchecked")
326:            private <K, V> Map<K, V> newConfigurationMap(Class<K> keyType) {
327:                if (keyType.equals(String.class)) {
328:                    Map<String, K> result = newCaseInsensitiveMap();
329:
330:                    return (Map<K, V>) result;
331:                }
332:
333:                return newMap();
334:            }
335:
336:            private <K, V> void addToMappedConfiguration(
337:                    MappedConfiguration<K, V> configuration,
338:                    Map<K, ContributionDef> keyToContribution,
339:                    Class<K> keyClass, Class<V> valueType,
340:                    ServiceDef serviceDef, Module module) {
341:                String serviceId = serviceDef.getServiceId();
342:                Set<ContributionDef> contributions = module
343:                        .getContributorDefsForService(serviceId);
344:
345:                if (contributions.isEmpty())
346:                    return;
347:
348:                Log log = logForService(serviceId);
349:
350:                boolean debug = log.isDebugEnabled();
351:
352:                ObjectLocator locator = new ServiceResourcesImpl(this , module,
353:                        serviceDef, _classFactory, log);
354:
355:                for (ContributionDef def : contributions) {
356:                    MappedConfiguration<K, V> validating = new ValidatingMappedConfigurationWrapper<K, V>(
357:                            serviceId, def, log, keyClass, valueType,
358:                            keyToContribution, configuration);
359:
360:                    if (debug)
361:                        log.debug(IOCMessages.invokingMethod(def));
362:
363:                    def.contribute(module, locator, validating);
364:                }
365:
366:            }
367:
368:            private <T> void addToUnorderedConfiguration(
369:                    Configuration<T> configuration, Class<T> valueType,
370:                    ServiceDef serviceDef, Module module) {
371:                String serviceId = serviceDef.getServiceId();
372:                Set<ContributionDef> contributions = module
373:                        .getContributorDefsForService(serviceId);
374:
375:                if (contributions.isEmpty())
376:                    return;
377:
378:                Log log = logForService(serviceId);
379:
380:                boolean debug = log.isDebugEnabled();
381:
382:                ObjectLocator locator = new ServiceResourcesImpl(this , module,
383:                        serviceDef, _classFactory, log);
384:
385:                for (ContributionDef def : contributions) {
386:                    Configuration<T> validating = new ValidatingConfigurationWrapper<T>(
387:                            serviceId, log, valueType, def, configuration);
388:
389:                    if (debug)
390:                        log.debug(IOCMessages.invokingMethod(def));
391:
392:                    def.contribute(module, locator, validating);
393:                }
394:            }
395:
396:            private <T> void addToOrderedConfiguration(
397:                    OrderedConfiguration<T> configuration, Class<T> valueType,
398:                    ServiceDef serviceDef, Module module) {
399:                String serviceId = serviceDef.getServiceId();
400:                Set<ContributionDef> contributions = module
401:                        .getContributorDefsForService(serviceId);
402:
403:                if (contributions.isEmpty())
404:                    return;
405:
406:                Log log = logForService(serviceId);
407:                boolean debug = log.isDebugEnabled();
408:
409:                ObjectLocator locator = new ServiceResourcesImpl(this , module,
410:                        serviceDef, _classFactory, log);
411:
412:                for (ContributionDef def : contributions) {
413:                    OrderedConfiguration<T> validating = new ValidatingOrderedConfigurationWrapper<T>(
414:                            serviceId, def, log, valueType, configuration);
415:
416:                    if (debug)
417:                        log.debug(IOCMessages.invokingMethod(def));
418:
419:                    def.contribute(module, locator, validating);
420:                }
421:            }
422:
423:            public <T> T getService(Class<T> serviceInterface) {
424:                _lock.check();
425:
426:                List<String> serviceIds = findServiceIdsForInterface(serviceInterface);
427:
428:                if (serviceIds == null)
429:                    serviceIds = Collections.emptyList();
430:
431:                switch (serviceIds.size()) {
432:                case 0:
433:
434:                    throw new RuntimeException(IOCMessages
435:                            .noServiceMatchesType(serviceInterface));
436:
437:                case 1:
438:
439:                    String serviceId = serviceIds.get(0);
440:
441:                    return getService(serviceId, serviceInterface);
442:
443:                default:
444:
445:                    Collections.sort(serviceIds);
446:
447:                    throw new RuntimeException(IOCMessages.manyServiceMatches(
448:                            serviceInterface, serviceIds));
449:                }
450:            }
451:
452:            private List<String> findServiceIdsForInterface(
453:                    Class serviceInterface) {
454:                List<String> result = newList();
455:
456:                for (Module module : _modules)
457:                    result.addAll(module
458:                            .findServiceIdsForInterface(serviceInterface));
459:
460:                for (Map.Entry<String, Object> entry : _builtinServices
461:                        .entrySet()) {
462:                    if (serviceInterface.isInstance(entry.getValue()))
463:                        result.add(entry.getKey());
464:                }
465:
466:                Collections.sort(result);
467:
468:                return result;
469:            }
470:
471:            public ServiceLifecycle getServiceLifecycle(String scope) {
472:                _lock.check();
473:
474:                ServiceLifecycle result = _lifecycles.get(scope);
475:
476:                if (result == null) {
477:                    ServiceLifecycleSource source = getService(
478:                            "ServiceLifecycleSource",
479:                            ServiceLifecycleSource.class);
480:                    result = source.get(scope);
481:                }
482:
483:                if (result == null)
484:                    throw new RuntimeException(IOCMessages.unknownScope(scope));
485:
486:                return result;
487:            }
488:
489:            public List<ServiceDecorator> findDecoratorsForService(
490:                    ServiceDef serviceDef) {
491:                _lock.check();
492:
493:                assert serviceDef != null;
494:
495:                Log log = logForService(serviceDef.getServiceId());
496:
497:                Orderer<ServiceDecorator> orderer = new Orderer<ServiceDecorator>(
498:                        log);
499:
500:                for (Module module : _modules) {
501:                    Set<DecoratorDef> decorators = module
502:                            .findMatchingDecoratorDefs(serviceDef);
503:
504:                    if (decorators.isEmpty())
505:                        continue;
506:
507:                    ServiceResources resources = new ServiceResourcesImpl(this ,
508:                            module, serviceDef, _classFactory, log);
509:
510:                    for (DecoratorDef dd : decorators) {
511:                        ServiceDecorator sd = dd.createDecorator(module,
512:                                resources);
513:
514:                        orderer.add(dd.getDecoratorId(), sd, dd
515:                                .getConstraints());
516:                    }
517:                }
518:
519:                return orderer.getOrdered();
520:            }
521:
522:            public ClassFab newClass(Class serviceInterface) {
523:                _lock.check();
524:
525:                return _classFactory.newClass(serviceInterface);
526:            }
527:
528:            private <T> T getObject(Class<T> objectType,
529:                    AnnotationProvider annotationProvider, ObjectLocator locator) {
530:                _lock.check();
531:
532:                ObjectProvider masterProvider = getService(
533:                        IOCConstants.MASTER_OBJECT_PROVIDER_SERVICE_ID,
534:                        ObjectProvider.class);
535:
536:                AnnotationProvider effectiveProvider = annotationProvider != null ? annotationProvider
537:                        : new NullAnnotationProvider();
538:
539:                return masterProvider.provide(objectType, effectiveProvider,
540:                        locator);
541:            }
542:
543:            public <T> T getObject(Class<T> objectType,
544:                    AnnotationProvider annotationProvider) {
545:                _lock.check();
546:
547:                return getObject(objectType, annotationProvider, this );
548:            }
549:
550:            public void addRegistryShutdownListener(
551:                    RegistryShutdownListener listener) {
552:                _lock.check();
553:
554:                _registryShutdownHub.addRegistryShutdownListener(listener);
555:            }
556:
557:            public String expandSymbols(String input) {
558:                _lock.check();
559:
560:                // Again, a bit of work to avoid instantiating the SymbolSource until absolutely necessary.
561:
562:                if (!InternalUtils.containsSymbols(input))
563:                    return input;
564:
565:                return getSymbolSource().expandSymbols(input);
566:            }
567:
568:            /** Defers obtaining the symbol source until actually needed. */
569:            private synchronized SymbolSource getSymbolSource() {
570:                if (_symbolSource == null)
571:                    _symbolSource = getService(SYMBOL_SOURCE_SERVICE_ID,
572:                            SymbolSource.class);
573:
574:                return _symbolSource;
575:            }
576:
577:            public <T> T autobuild(Class<T> clazz) {
578:                notNull(clazz, "clazz");
579:
580:                Constructor constructor = InternalUtils
581:                        .findAutobuildConstructor(clazz);
582:
583:                if (constructor == null)
584:                    throw new RuntimeException(IOCMessages
585:                            .noAutobuildConstructor(clazz));
586:
587:                Throwable failure = null;
588:                // An empty map, because when performing autobuilding outside the context of building a
589:                // service, we don't have defaults for Log, service id, etc.
590:
591:                Map<Class, Object> empty = Collections.emptyMap();
592:
593:                try {
594:                    Object[] parameters = InternalUtils
595:                            .calculateParametersForConstructor(constructor,
596:                                    this , empty);
597:
598:                    return clazz.cast(constructor.newInstance(parameters));
599:                } catch (InvocationTargetException ite) {
600:                    failure = ite.getTargetException();
601:                } catch (Exception ex) {
602:                    failure = ex;
603:                }
604:
605:                String description = _classFactory.getConstructorLocation(
606:                        constructor).toString();
607:
608:                throw new RuntimeException(IOCMessages
609:                        .autobuildConstructorError(description, failure),
610:                        failure);
611:
612:            }
613:
614:        }
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