Source Code Cross Referenced for InstantiationModelAwarePointcutAdvisorImpl.java in  » J2EE » spring-framework-2.5 » org » springframework » aop » aspectj » annotation » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.5 » org.springframework.aop.aspectj.annotation 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2002-2006 the original author or authors.
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 org.springframework.aop.aspectj.annotation;
018:
019:        import java.lang.reflect.Method;
020:
021:        import org.aopalliance.aop.Advice;
022:        import org.aspectj.lang.reflect.PerClauseKind;
023:
024:        import org.springframework.aop.Pointcut;
025:        import org.springframework.aop.aspectj.AspectJExpressionPointcut;
026:        import org.springframework.aop.aspectj.AspectJPrecedenceInformation;
027:        import org.springframework.aop.aspectj.InstantiationModelAwarePointcutAdvisor;
028:        import org.springframework.aop.aspectj.annotation.AbstractAspectJAdvisorFactory.AspectJAnnotation;
029:        import org.springframework.aop.support.DynamicMethodMatcherPointcut;
030:        import org.springframework.aop.support.Pointcuts;
031:
032:        /**
033:         * Internal implementation of AspectJPointcutAdvisor.
034:         * Note that there will be one instance of this advisor for each target method.
035:         *
036:         * @author Rod Johnson
037:         * @author Juergen Hoeller
038:         * @since 2.0
039:         */
040:        class InstantiationModelAwarePointcutAdvisorImpl implements 
041:                InstantiationModelAwarePointcutAdvisor,
042:                AspectJPrecedenceInformation {
043:
044:            private final AspectJExpressionPointcut declaredPointcut;
045:
046:            private Pointcut pointcut;
047:
048:            private final MetadataAwareAspectInstanceFactory aspectInstanceFactory;
049:
050:            private final Method method;
051:
052:            private final boolean lazy;
053:
054:            private final AspectJAdvisorFactory atAspectJAdvisorFactory;
055:
056:            private Advice instantiatedAdvice;
057:
058:            private int declarationOrder;
059:
060:            private String aspectName;
061:
062:            private Boolean isBeforeAdvice = null;
063:
064:            private Boolean isAfterAdvice = null;
065:
066:            public InstantiationModelAwarePointcutAdvisorImpl(
067:                    AspectJAdvisorFactory af, AspectJExpressionPointcut ajexp,
068:                    MetadataAwareAspectInstanceFactory aif, Method method,
069:                    int declarationOrderInAspect, String aspectName) {
070:
071:                this .declaredPointcut = ajexp;
072:                this .method = method;
073:                this .atAspectJAdvisorFactory = af;
074:                this .aspectInstanceFactory = aif;
075:                this .declarationOrder = declarationOrderInAspect;
076:                this .aspectName = aspectName;
077:
078:                if (aif.getAspectMetadata().isLazilyInstantiated()) {
079:                    // Static part of the pointcut is a lazy type.
080:                    Pointcut preInstantiationPointcut = Pointcuts.union(aif
081:                            .getAspectMetadata().getPerClausePointcut(),
082:                            this .declaredPointcut);
083:
084:                    // Make it dynamic: must mutate from pre-instantiation to post-instantiation state.
085:                    // If it's not a dynamic pointcut, it may be optimized out
086:                    // by the Spring AOP infrastructure after the first evaluation.
087:                    this .pointcut = new PerTargetInstantiationModelPointcut(
088:                            this .declaredPointcut, preInstantiationPointcut,
089:                            aif);
090:                    this .lazy = true;
091:                } else {
092:                    // A singleton aspect.
093:                    this .instantiatedAdvice = instantiateAdvice(this .declaredPointcut);
094:                    this .pointcut = declaredPointcut;
095:                    this .lazy = false;
096:                }
097:            }
098:
099:            /**
100:             * The pointcut for Spring AOP to use. Actual behaviour of the pointcut will change
101:             * depending on the state of the advice.
102:             */
103:            public Pointcut getPointcut() {
104:                return this .pointcut;
105:            }
106:
107:            /**
108:             * This is only of interest for Spring AOP: AspectJ instantiation semantics
109:             * are much richer. In AspectJ terminology, all a return of <code>true</code>
110:             * means here is that the aspect is not a SINGLETON.
111:             */
112:            public boolean isPerInstance() {
113:                return (getAspectMetadata().getAjType().getPerClause()
114:                        .getKind() != PerClauseKind.SINGLETON);
115:            }
116:
117:            /**
118:             * Return the AspectJ AspectMetadata for this advisor.
119:             */
120:            public AspectMetadata getAspectMetadata() {
121:                return this .aspectInstanceFactory.getAspectMetadata();
122:            }
123:
124:            /**
125:             * Lazily instantiate advice if necessary.
126:             */
127:            public synchronized Advice getAdvice() {
128:                if (this .instantiatedAdvice == null) {
129:                    this .instantiatedAdvice = instantiateAdvice(this .declaredPointcut);
130:                }
131:                return this .instantiatedAdvice;
132:            }
133:
134:            public boolean isLazy() {
135:                return this .lazy;
136:            }
137:
138:            public synchronized boolean isAdviceInstantiated() {
139:                return (this .instantiatedAdvice != null);
140:            }
141:
142:            private Advice instantiateAdvice(AspectJExpressionPointcut pcut) {
143:                return this .atAspectJAdvisorFactory.getAdvice(this .method,
144:                        pcut, this .aspectInstanceFactory,
145:                        this .declarationOrder, this .aspectName);
146:            }
147:
148:            public MetadataAwareAspectInstanceFactory getAspectInstanceFactory() {
149:                return this .aspectInstanceFactory;
150:            }
151:
152:            public AspectJExpressionPointcut getDeclaredPointcut() {
153:                return this .declaredPointcut;
154:            }
155:
156:            public int getOrder() {
157:                return this .aspectInstanceFactory.getOrder();
158:            }
159:
160:            public String getAspectName() {
161:                return this .aspectName;
162:            }
163:
164:            public int getDeclarationOrder() {
165:                return this .declarationOrder;
166:            }
167:
168:            public boolean isBeforeAdvice() {
169:                if (this .isBeforeAdvice == null) {
170:                    determineAdviceType();
171:                }
172:                return this .isBeforeAdvice;
173:            }
174:
175:            public boolean isAfterAdvice() {
176:                if (this .isAfterAdvice == null) {
177:                    determineAdviceType();
178:                }
179:                return this .isAfterAdvice;
180:            }
181:
182:            /**
183:             * Duplicates some logic from getAdvice, but importantly does not force
184:             * creation of the advice.
185:             */
186:            private void determineAdviceType() {
187:                AspectJAnnotation<?> aspectJAnnotation = AbstractAspectJAdvisorFactory
188:                        .findAspectJAnnotationOnMethod(this .method);
189:                if (aspectJAnnotation == null) {
190:                    this .isBeforeAdvice = false;
191:                    this .isAfterAdvice = false;
192:                } else {
193:                    switch (aspectJAnnotation.getAnnotationType()) {
194:                    case AtAfter:
195:                    case AtAfterReturning:
196:                    case AtAfterThrowing:
197:                        this .isAfterAdvice = true;
198:                        this .isBeforeAdvice = false;
199:                        break;
200:                    case AtAround:
201:                    case AtPointcut:
202:                        this .isAfterAdvice = false;
203:                        this .isBeforeAdvice = false;
204:                        break;
205:                    case AtBefore:
206:                        this .isAfterAdvice = false;
207:                        this .isBeforeAdvice = true;
208:                    }
209:                }
210:            }
211:
212:            @Override
213:            public String toString() {
214:                return "InstantiationModelAwarePointcutAdvisor: expression ["
215:                        + getDeclaredPointcut().getExpression()
216:                        + "]; advice method ["
217:                        + this .method
218:                        + "]; perClauseKind="
219:                        + this .aspectInstanceFactory.getAspectMetadata()
220:                                .getAjType().getPerClause().getKind();
221:
222:            }
223:
224:            /**
225:             * Pointcut implementation that changes its behaviour when the advice is instantiated.
226:             * Note that this is a <i>dynamic</i> pointcut. Otherwise it might
227:             * be optimized out if it does not at first match statically.
228:             */
229:            private class PerTargetInstantiationModelPointcut extends
230:                    DynamicMethodMatcherPointcut {
231:
232:                private final AspectJExpressionPointcut declaredPointcut;
233:
234:                private final Pointcut preInstantiationPointcut;
235:
236:                private LazySingletonAspectInstanceFactoryDecorator aspectInstanceFactory;
237:
238:                private PerTargetInstantiationModelPointcut(
239:                        AspectJExpressionPointcut declaredPointcut,
240:                        Pointcut preInstantiationPointcut,
241:                        MetadataAwareAspectInstanceFactory aspectInstanceFactory) {
242:                    this .declaredPointcut = declaredPointcut;
243:                    this .preInstantiationPointcut = preInstantiationPointcut;
244:                    if (aspectInstanceFactory instanceof  LazySingletonAspectInstanceFactoryDecorator) {
245:                        this .aspectInstanceFactory = (LazySingletonAspectInstanceFactoryDecorator) aspectInstanceFactory;
246:                    }
247:                }
248:
249:                @Override
250:                public boolean matches(Method method, Class targetClass) {
251:                    // We're either instantiated and matching on declared pointcut, or uninstantiated matching on either pointcut
252:                    return (isAspectMaterialized() && this .declaredPointcut
253:                            .matches(method, targetClass))
254:                            || this .preInstantiationPointcut.getMethodMatcher()
255:                                    .matches(method, targetClass);
256:                }
257:
258:                public boolean matches(Method method, Class targetClass,
259:                        Object[] args) {
260:                    // This can match only on declared pointcut.
261:                    return (isAspectMaterialized() && this .declaredPointcut
262:                            .matches(method, targetClass));
263:                }
264:
265:                private boolean isAspectMaterialized() {
266:                    return (this.aspectInstanceFactory == null || this.aspectInstanceFactory
267:                            .isMaterialized());
268:                }
269:            }
270:
271:        }
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