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Java Source Code / Java Documentation » Testing » Ejb3Unit » com.bm.ejb3guice.inject 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (C) 2007 Google Inc.
003:         *
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         *
008:         * http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package com.bm.ejb3guice.inject;
018:
019:        import com.bm.ejb3guice.binder.AnnotatedBindingBuilder;
020:        import com.bm.ejb3guice.binder.ScopedBindingBuilder;
021:        import com.bm.ejb3guice.inject.BinderImpl.CreationListener;
022:        import com.bm.ejb3guice.internal.Annotations;
023:        import com.bm.ejb3guice.internal.Objects;
024:        import com.bm.ejb3guice.internal.StackTraceElements;
025:        import com.bm.ejb3guice.internal.ToStringBuilder;
026:
027:        import java.lang.annotation.Annotation;
028:        import java.util.logging.Level;
029:        import java.util.logging.Logger;
030:
031:        /**
032:         * Binds a {@link com.bm.ejb3guice.inject.Key} to an implementation in a given scope.
033:         */
034:        class BindingBuilderImpl<T> implements  AnnotatedBindingBuilder<T> {
035:
036:            private static final Logger logger = Logger
037:                    .getLogger(BindingBuilderImpl.class.getName());
038:
039:            final Object source;
040:            Key<T> key;
041:            InternalFactory<? extends T> factory;
042:            T instance;
043:            Scope scope;
044:            boolean preload = false;
045:            private BinderImpl binder;
046:
047:            BindingBuilderImpl(BinderImpl binder, Key<T> key, Object source) {
048:                this .binder = binder;
049:                this .key = Objects.nonNull(key, "key");
050:                this .source = source;
051:            }
052:
053:            Object getSource() {
054:                return source;
055:            }
056:
057:            Key<T> getKey() {
058:                return key;
059:            }
060:
061:            public BindingBuilderImpl<T> annotatedWith(
062:                    Class<? extends Annotation> annotationType) {
063:                if (this .key.hasAnnotationType()) {
064:                    binder.addError(source,
065:                            ErrorMessages.ANNOTATION_ALREADY_SPECIFIED);
066:                } else {
067:                    boolean retainedAtRuntime = Annotations
068:                            .isRetainedAtRuntime(annotationType);
069:                    boolean bindingAnnotation = Key
070:                            .isBindingAnnotation(annotationType);
071:
072:                    if (!retainedAtRuntime) {
073:                        binder.addError(StackTraceElements
074:                                .forType(annotationType),
075:                                ErrorMessages.MISSING_RUNTIME_RETENTION, binder
076:                                        .source());
077:                    }
078:
079:                    if (!bindingAnnotation) {
080:                        binder.addError(StackTraceElements
081:                                .forType(annotationType),
082:                                ErrorMessages.MISSING_BINDING_ANNOTATION,
083:                                binder.source());
084:                    }
085:
086:                    if (retainedAtRuntime && bindingAnnotation) {
087:                        this .key = Key.get(this .key.getTypeLiteral(),
088:                                annotationType);
089:                    }
090:                }
091:                return this ;
092:            }
093:
094:            public BindingBuilderImpl<T> annotatedWith(Annotation annotation) {
095:                if (this .key.hasAnnotationType()) {
096:                    binder.addError(source,
097:                            ErrorMessages.ANNOTATION_ALREADY_SPECIFIED);
098:                } else {
099:                    Class<? extends Annotation> annotationType = annotation
100:                            .annotationType();
101:
102:                    boolean retainedAtRuntime = Annotations
103:                            .isRetainedAtRuntime(annotationType);
104:                    boolean bindingAnnotation = Key
105:                            .isBindingAnnotation(annotationType);
106:
107:                    if (!retainedAtRuntime) {
108:                        binder.addError(StackTraceElements
109:                                .forType(annotationType),
110:                                ErrorMessages.MISSING_RUNTIME_RETENTION, binder
111:                                        .source());
112:                    }
113:
114:                    if (!bindingAnnotation) {
115:                        binder.addError(StackTraceElements
116:                                .forType(annotationType),
117:                                ErrorMessages.MISSING_BINDING_ANNOTATION,
118:                                binder.source());
119:                    }
120:
121:                    if (retainedAtRuntime && bindingAnnotation) {
122:                        this .key = Key.get(this .key.getTypeLiteral(),
123:                                annotation);
124:                    }
125:                }
126:                return this ;
127:            }
128:
129:            public ScopedBindingBuilder to(Class<? extends T> implementation) {
130:                return to(TypeLiteral.get(implementation));
131:            }
132:
133:            public ScopedBindingBuilder to(
134:                    TypeLiteral<? extends T> implementation) {
135:                return to(Key.get(implementation));
136:            }
137:
138:            public ScopedBindingBuilder to(Key<? extends T> targetKey) {
139:                ensureImplementationIsNotSet();
140:
141:                if (key.equals(targetKey)) {
142:                    binder.addError(source, ErrorMessages.RECURSIVE_BINDING);
143:                }
144:
145:                final FactoryProxy<? extends T> factoryProxy = new FactoryProxy<T>(
146:                        key, targetKey, source);
147:                this .factory = factoryProxy;
148:                binder.creationListeners.add(factoryProxy);
149:                return this ;
150:            }
151:
152:            public void toInstance(T instance) {
153:                ensureImplementationIsNotSet();
154:                this .instance = Objects.nonNull(instance, "instance");
155:                this .factory = new ConstantFactory<T>(instance);
156:                registerInstanceForInjection(instance);
157:                if (this .scope != null) {
158:                    binder.addError(source,
159:                            ErrorMessages.SINGLE_INSTANCE_AND_SCOPE);
160:                }
161:            }
162:
163:            /**
164:             * Binds to instances from the given factory.
165:             */
166:            BindingBuilderImpl<T> to(InternalFactory<? extends T> factory) {
167:                ensureImplementationIsNotSet();
168:                this .factory = factory;
169:                return this ;
170:            }
171:
172:            public ScopedBindingBuilder toProvider(
173:                    Provider<? extends T> provider) {
174:                ensureImplementationIsNotSet();
175:                this .factory = new InternalFactoryToProviderAdapter<T>(
176:                        provider, source);
177:                registerInstanceForInjection(provider);
178:                return this ;
179:            }
180:
181:            public BindingBuilderImpl<T> toProvider(
182:                    Class<? extends Provider<? extends T>> providerType) {
183:                return toProvider(Key.get(providerType));
184:            }
185:
186:            public BindingBuilderImpl<T> toProvider(
187:                    Key<? extends Provider<? extends T>> providerKey) {
188:                ensureImplementationIsNotSet();
189:
190:                final BoundProviderFactory<T> boundProviderFactory = new BoundProviderFactory<T>(
191:                        providerKey, source);
192:                binder.creationListeners.add(boundProviderFactory);
193:                this .factory = boundProviderFactory;
194:
195:                return this ;
196:            }
197:
198:            /**
199:             * Adds an error message if the implementation has already been bound.
200:             */
201:            private void ensureImplementationIsNotSet() {
202:                if (factory != null) {
203:                    binder.addError(source,
204:                            ErrorMessages.IMPLEMENTATION_ALREADY_SET);
205:                }
206:            }
207:
208:            public void in(Class<? extends Annotation> scopeAnnotation) {
209:                // this method not test-covered
210:                ensureScopeNotSet();
211:
212:                // We could defer this lookup to when we create the Injector, but this
213:                // is fine for now.
214:                this .scope = binder.scopes.get(Objects.nonNull(scopeAnnotation,
215:                        "scope annotation"));
216:                if (this .scope == null) {
217:                    binder.addError(source, ErrorMessages.SCOPE_NOT_FOUND, "@"
218:                            + scopeAnnotation.getSimpleName());
219:                }
220:            }
221:
222:            public void in(Scope scope) {
223:                ensureScopeNotSet();
224:                this .scope = Objects.nonNull(scope, "scope");
225:            }
226:
227:            private void ensureScopeNotSet() {
228:                // Scoping isn't allowed when we have only one instance.
229:                if (this .instance != null) {
230:                    binder.addError(source,
231:                            ErrorMessages.SINGLE_INSTANCE_AND_SCOPE);
232:                    return;
233:                }
234:
235:                if (this .scope != null) {
236:                    binder.addError(source, ErrorMessages.SCOPE_ALREADY_SET);
237:                }
238:            }
239:
240:            public void asEagerSingleton() {
241:                in(Scopes.SINGLETON);
242:                this .preload = true;
243:            }
244:
245:            boolean shouldPreload() {
246:                return preload;
247:            }
248:
249:            InternalFactory<? extends T> getInternalFactory(
250:                    InjectorImpl injector) {
251:                if (this .factory == null && !key.hasAnnotationType()) {
252:                    // Try an implicit binding.
253:                    final ImplicitImplementation<T> implicitImplementation = new ImplicitImplementation<T>(
254:                            key, scope, source);
255:                    binder.creationListeners.add(implicitImplementation);
256:
257:                    // We need to record the scope. If it's singleton, we'll preload in prod.
258:                    if (this .scope == null) {
259:                        // We can ignore errors because the error will already have been
260:                        // recorded.
261:                        this .scope = Scopes.getScopeForType(key
262:                                .getTypeLiteral().getRawType(), binder.scopes,
263:                                IGNORE_ERRORS);
264:                    }
265:
266:                    return implicitImplementation;
267:                }
268:
269:                return Scopes.scope(this .key, injector, this .factory, scope);
270:            }
271:
272:            boolean isSingletonScoped() {
273:                return this .scope == Scopes.SINGLETON;
274:            }
275:
276:            void registerInstanceForInjection(final Object o) {
277:                binder.instanceInjectors.add(new CreationListener() {
278:                    public void notify(InjectorImpl injector) {
279:                        try {
280:                            injector.injectMembers(o);
281:                        } catch (Exception e) {
282:                            String className = e.getClass().getSimpleName();
283:                            String message = ErrorMessages.getRootMessage(e);
284:                            String logMessage = String.format(
285:                                    ErrorMessages.ERROR_INJECTING_MEMBERS, o,
286:                                    message);
287:                            logger.log(Level.INFO, logMessage, e);
288:                            binder
289:                                    .addError(
290:                                            source,
291:                                            ErrorMessages.ERROR_INJECTING_MEMBERS_SEE_LOG,
292:                                            className, o, message);
293:                        }
294:                    }
295:                });
296:            }
297:
298:            /**
299:             * A placeholder which enables us to swap in the real factory once the
300:             * container is created.
301:             */
302:            private static class FactoryProxy<T> implements  InternalFactory<T>,
303:                    CreationListener {
304:
305:                private final Key<T> key;
306:                private final Key<? extends T> targetKey;
307:                private final Object source;
308:
309:                InternalFactory<? extends T> targetFactory;
310:
311:                FactoryProxy(Key<T> key, Key<? extends T> targetKey,
312:                        Object source) {
313:                    this .key = key;
314:                    this .targetKey = targetKey;
315:                    this .source = source;
316:                }
317:
318:                public void notify(final InjectorImpl injector) {
319:                    injector.withDefaultSource(source, new Runnable() {
320:                        public void run() {
321:                            targetFactory = injector.getInternalFactory(null,
322:                                    targetKey);
323:                        }
324:                    });
325:                }
326:
327:                public T get(InternalContext context) {
328:                    return targetFactory.get(context);
329:                }
330:
331:                public String toString() {
332:                    return new ToStringBuilder(FactoryProxy.class).add("key",
333:                            key).add("provider", targetFactory).toString();
334:                }
335:            }
336:
337:            private static class ImplicitImplementation<T> implements 
338:                    InternalFactory<T>, CreationListener {
339:
340:                private final Key<T> key;
341:                private final Object source;
342:                private final Scope scope;
343:                InternalFactory<? extends T> implicitFactory;
344:
345:                ImplicitImplementation(Key<T> key, Scope scope, Object source) {
346:                    this .key = key;
347:                    this .scope = scope;
348:                    this .source = source;
349:                }
350:
351:                public void notify(final InjectorImpl injector) {
352:                    injector.withDefaultSource(source, new Runnable() {
353:                        public void run() {
354:                            implicitFactory = injector.getImplicitBinding(null,
355:                                    (Class) key.getTypeLiteral().getRawType(),
356:                                    scope);
357:                        }
358:                    });
359:                }
360:
361:                public T get(InternalContext context) {
362:                    return implicitFactory.get(context);
363:                }
364:
365:                public String toString() {
366:                    return new ToStringBuilder(FactoryProxy.class).add("key",
367:                            key).add("provider", implicitFactory).toString();
368:                }
369:            }
370:
371:            static ErrorHandler IGNORE_ERRORS = new ErrorHandler() {
372:                public void handle(Object source, String message) {
373:                }
374:
375:                public void handle(Object source, String message,
376:                        Object... arguments) {
377:                }
378:            };
379:        }
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