/*
* Copyright 2002-2010 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.aop.aspectj.annotation;
import java.lang.reflect.Method;
import org.aopalliance.aop.Advice;
import org.aspectj.lang.reflect.PerClauseKind;
import org.springframework.aop.Pointcut;
import org.springframework.aop.aspectj.AspectJExpressionPointcut;
import org.springframework.aop.aspectj.AspectJPrecedenceInformation;
import org.springframework.aop.aspectj.InstantiationModelAwarePointcutAdvisor;
import org.springframework.aop.aspectj.annotation.AbstractAspectJAdvisorFactory.AspectJAnnotation;
import org.springframework.aop.support.DynamicMethodMatcherPointcut;
import org.springframework.aop.support.Pointcuts;
/**
* Internal implementation of AspectJPointcutAdvisor.
* Note that there will be one instance of this advisor for each target method.
*
* @author Rod Johnson
* @author Juergen Hoeller
* @since 2.0
*/
class InstantiationModelAwarePointcutAdvisorImpl
implements InstantiationModelAwarePointcutAdvisor, AspectJPrecedenceInformation {
private final AspectJExpressionPointcut declaredPointcut;
private Pointcut pointcut;
private final MetadataAwareAspectInstanceFactory aspectInstanceFactory;
private final Method method;
private final boolean lazy;
private final AspectJAdvisorFactory atAspectJAdvisorFactory;
private Advice instantiatedAdvice;
private int declarationOrder;
private String aspectName;
private Boolean isBeforeAdvice;
private Boolean isAfterAdvice;
public InstantiationModelAwarePointcutAdvisorImpl(AspectJAdvisorFactory af, AspectJExpressionPointcut ajexp,
MetadataAwareAspectInstanceFactory aif, Method method, int declarationOrderInAspect, String aspectName) {
this.declaredPointcut = ajexp;
this.method = method;
this.atAspectJAdvisorFactory = af;
this.aspectInstanceFactory = aif;
this.declarationOrder = declarationOrderInAspect;
this.aspectName = aspectName;
if (aif.getAspectMetadata().isLazilyInstantiated()) {
// Static part of the pointcut is a lazy type.
Pointcut preInstantiationPointcut =
Pointcuts.union(aif.getAspectMetadata().getPerClausePointcut(), this.declaredPointcut);
// Make it dynamic: must mutate from pre-instantiation to post-instantiation state.
// If it's not a dynamic pointcut, it may be optimized out
// by the Spring AOP infrastructure after the first evaluation.
this.pointcut = new PerTargetInstantiationModelPointcut(this.declaredPointcut, preInstantiationPointcut, aif);
this.lazy = true;
}
else {
// A singleton aspect.
this.instantiatedAdvice = instantiateAdvice(this.declaredPointcut);
this.pointcut = declaredPointcut;
this.lazy = false;
}
}
/**
* The pointcut for Spring AOP to use. Actual behaviour of the pointcut will change
* depending on the state of the advice.
*/
public Pointcut getPointcut() {
return this.pointcut;
}
/**
* This is only of interest for Spring AOP: AspectJ instantiation semantics
* are much richer. In AspectJ terminology, all a return of <code>true</code>
* means here is that the aspect is not a SINGLETON.
*/
public boolean isPerInstance() {
return (getAspectMetadata().getAjType().getPerClause().getKind() != PerClauseKind.SINGLETON);
}
/**
* Return the AspectJ AspectMetadata for this advisor.
*/
public AspectMetadata getAspectMetadata() {
return this.aspectInstanceFactory.getAspectMetadata();
}
/**
* Lazily instantiate advice if necessary.
*/
public synchronized Advice getAdvice() {
if (this.instantiatedAdvice == null) {
this.instantiatedAdvice = instantiateAdvice(this.declaredPointcut);
}
return this.instantiatedAdvice;
}
public boolean isLazy() {
return this.lazy;
}
public synchronized boolean isAdviceInstantiated() {
return (this.instantiatedAdvice != null);
}
private Advice instantiateAdvice(AspectJExpressionPointcut pcut) {
return this.atAspectJAdvisorFactory.getAdvice(
this.method, pcut, this.aspectInstanceFactory, this.declarationOrder, this.aspectName);
}
public MetadataAwareAspectInstanceFactory getAspectInstanceFactory() {
return this.aspectInstanceFactory;
}
public AspectJExpressionPointcut getDeclaredPointcut() {
return this.declaredPointcut;
}
public int getOrder() {
return this.aspectInstanceFactory.getOrder();
}
public String getAspectName() {
return this.aspectName;
}
public int getDeclarationOrder() {
return this.declarationOrder;
}
public boolean isBeforeAdvice() {
if (this.isBeforeAdvice == null) {
determineAdviceType();
}
return this.isBeforeAdvice;
}
public boolean isAfterAdvice() {
if (this.isAfterAdvice == null) {
determineAdviceType();
}
return this.isAfterAdvice;
}
/**
* Duplicates some logic from getAdvice, but importantly does not force
* creation of the advice.
*/
private void determineAdviceType() {
AspectJAnnotation<?> aspectJAnnotation =
AbstractAspectJAdvisorFactory.findAspectJAnnotationOnMethod(this.method);
if (aspectJAnnotation == null) {
this.isBeforeAdvice = false;
this.isAfterAdvice = false;
}
else {
switch (aspectJAnnotation.getAnnotationType()) {
case AtAfter:
case AtAfterReturning:
case AtAfterThrowing:
this.isAfterAdvice = true;
this.isBeforeAdvice = false;
break;
case AtAround:
case AtPointcut:
this.isAfterAdvice = false;
this.isBeforeAdvice = false;
break;
case AtBefore:
this.isAfterAdvice = false;
this.isBeforeAdvice = true;
}
}
}
@Override
public String toString() {
return "InstantiationModelAwarePointcutAdvisor: expression [" + getDeclaredPointcut().getExpression() +
"]; advice method [" + this.method + "]; perClauseKind=" +
this.aspectInstanceFactory.getAspectMetadata().getAjType().getPerClause().getKind();
}
/**
* Pointcut implementation that changes its behaviour when the advice is instantiated.
* Note that this is a <i>dynamic</i> pointcut. Otherwise it might
* be optimized out if it does not at first match statically.
*/
private class PerTargetInstantiationModelPointcut extends DynamicMethodMatcherPointcut {
private final AspectJExpressionPointcut declaredPointcut;
private final Pointcut preInstantiationPointcut;
private LazySingletonAspectInstanceFactoryDecorator aspectInstanceFactory;
private PerTargetInstantiationModelPointcut(AspectJExpressionPointcut declaredPointcut,
Pointcut preInstantiationPointcut, MetadataAwareAspectInstanceFactory aspectInstanceFactory) {
this.declaredPointcut = declaredPointcut;
this.preInstantiationPointcut = preInstantiationPointcut;
if (aspectInstanceFactory instanceof LazySingletonAspectInstanceFactoryDecorator) {
this.aspectInstanceFactory = (LazySingletonAspectInstanceFactoryDecorator) aspectInstanceFactory;
}
}
@Override
public boolean matches(Method method, Class targetClass) {
// We're either instantiated and matching on declared pointcut, or uninstantiated matching on either pointcut
return (isAspectMaterialized() && this.declaredPointcut.matches(method, targetClass)) ||
this.preInstantiationPointcut.getMethodMatcher().matches(method, targetClass);
}
public boolean matches(Method method, Class targetClass, Object[] args) {
// This can match only on declared pointcut.
return (isAspectMaterialized() && this.declaredPointcut.matches(method, targetClass));
}
private boolean isAspectMaterialized() {
return (this.aspectInstanceFactory == null || this.aspectInstanceFactory.isMaterialized());
}
}
}
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