spring AspectJExpressionPointcut 源码
spring AspectJExpressionPointcut 代码
文件路径：/spring-aop/src/main/java/org/springframework/aop/aspectj/AspectJExpressionPointcut.java
/*
* Copyright 2002-2022 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
*
* https://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;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import org.aopalliance.intercept.MethodInvocation;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.aspectj.weaver.patterns.NamePattern;
import org.aspectj.weaver.reflect.ReflectionWorld.ReflectionWorldException;
import org.aspectj.weaver.reflect.ShadowMatchImpl;
import org.aspectj.weaver.tools.ContextBasedMatcher;
import org.aspectj.weaver.tools.FuzzyBoolean;
import org.aspectj.weaver.tools.JoinPointMatch;
import org.aspectj.weaver.tools.MatchingContext;
import org.aspectj.weaver.tools.PointcutDesignatorHandler;
import org.aspectj.weaver.tools.PointcutExpression;
import org.aspectj.weaver.tools.PointcutParameter;
import org.aspectj.weaver.tools.PointcutParser;
import org.aspectj.weaver.tools.PointcutPrimitive;
import org.aspectj.weaver.tools.ShadowMatch;
import org.springframework.aop.ClassFilter;
import org.springframework.aop.IntroductionAwareMethodMatcher;
import org.springframework.aop.MethodMatcher;
import org.springframework.aop.ProxyMethodInvocation;
import org.springframework.aop.framework.autoproxy.ProxyCreationContext;
import org.springframework.aop.interceptor.ExposeInvocationInterceptor;
import org.springframework.aop.support.AbstractExpressionPointcut;
import org.springframework.aop.support.AopUtils;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.BeanFactoryUtils;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.annotation.BeanFactoryAnnotationUtils;
import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
import org.springframework.util.ObjectUtils;
import org.springframework.util.StringUtils;
/**
* Spring {@link org.springframework.aop.Pointcut} implementation
* that uses the AspectJ weaver to evaluate a pointcut expression.
*
* <p>The pointcut expression value is an AspectJ expression. This can
* reference other pointcuts and use composition and other operations.
*
* <p>Naturally, as this is to be processed by Spring AOP's proxy-based model,
* only method execution pointcuts are supported.
*
* @author Rob Harrop
* @author Adrian Colyer
* @author Rod Johnson
* @author Juergen Hoeller
* @author Ramnivas Laddad
* @author Dave Syer
* @since 2.0
*/
@SuppressWarnings("serial")
public class AspectJExpressionPointcut extends AbstractExpressionPointcut
implements ClassFilter, IntroductionAwareMethodMatcher, BeanFactoryAware {
private static final Set<PointcutPrimitive> SUPPORTED_PRIMITIVES = new HashSet<>();
static {
SUPPORTED_PRIMITIVES.add(PointcutPrimitive.EXECUTION);
SUPPORTED_PRIMITIVES.add(PointcutPrimitive.ARGS);
SUPPORTED_PRIMITIVES.add(PointcutPrimitive.REFERENCE);
SUPPORTED_PRIMITIVES.add(PointcutPrimitive.THIS);
SUPPORTED_PRIMITIVES.add(PointcutPrimitive.TARGET);
SUPPORTED_PRIMITIVES.add(PointcutPrimitive.WITHIN);
SUPPORTED_PRIMITIVES.add(PointcutPrimitive.AT_ANNOTATION);
SUPPORTED_PRIMITIVES.add(PointcutPrimitive.AT_WITHIN);
SUPPORTED_PRIMITIVES.add(PointcutPrimitive.AT_ARGS);
SUPPORTED_PRIMITIVES.add(PointcutPrimitive.AT_TARGET);
}
private static final Log logger = LogFactory.getLog(AspectJExpressionPointcut.class);
@Nullable
private Class<?> pointcutDeclarationScope;
private String[] pointcutParameterNames = new String[0];
private Class<?>[] pointcutParameterTypes = new Class<?>[0];
@Nullable
private BeanFactory beanFactory;
@Nullable
private transient ClassLoader pointcutClassLoader;
@Nullable
private transient PointcutExpression pointcutExpression;
private transient Map<Method, ShadowMatch> shadowMatchCache = new ConcurrentHashMap<>(32);
/**
* Create a new default AspectJExpressionPointcut.
*/
public AspectJExpressionPointcut() {
}
/**
* Create a new AspectJExpressionPointcut with the given settings.
* @param declarationScope the declaration scope for the pointcut
* @param paramNames the parameter names for the pointcut
* @param paramTypes the parameter types for the pointcut
*/
public AspectJExpressionPointcut(Class<?> declarationScope, String[] paramNames, Class<?>[] paramTypes) {
this.pointcutDeclarationScope = declarationScope;
if (paramNames.length != paramTypes.length) {
throw new IllegalStateException(
"Number of pointcut parameter names must match number of pointcut parameter types");
}
this.pointcutParameterNames = paramNames;
this.pointcutParameterTypes = paramTypes;
}
/**
* Set the declaration scope for the pointcut.
*/
public void setPointcutDeclarationScope(Class<?> pointcutDeclarationScope) {
this.pointcutDeclarationScope = pointcutDeclarationScope;
}
/**
* Set the parameter names for the pointcut.
*/
public void setParameterNames(String... names) {
this.pointcutParameterNames = names;
}
/**
* Set the parameter types for the pointcut.
*/
public void setParameterTypes(Class<?>... types) {
this.pointcutParameterTypes = types;
}
@Override
public void setBeanFactory(BeanFactory beanFactory) {
this.beanFactory = beanFactory;
}
@Override
public ClassFilter getClassFilter() {
obtainPointcutExpression();
return this;
}
@Override
public MethodMatcher getMethodMatcher() {
obtainPointcutExpression();
return this;
}
/**
* Check whether this pointcut is ready to match,
* lazily building the underlying AspectJ pointcut expression.
*/
private PointcutExpression obtainPointcutExpression() {
if (getExpression() == null) {
throw new IllegalStateException("Must set property 'expression' before attempting to match");
}
if (this.pointcutExpression == null) {
this.pointcutClassLoader = determinePointcutClassLoader();
this.pointcutExpression = buildPointcutExpression(this.pointcutClassLoader);
}
return this.pointcutExpression;
}
/**
* Determine the ClassLoader to use for pointcut evaluation.
*/
@Nullable
private ClassLoader determinePointcutClassLoader() {
if (this.beanFactory instanceof ConfigurableBeanFactory) {
return ((ConfigurableBeanFactory) this.beanFactory).getBeanClassLoader();
}
if (this.pointcutDeclarationScope != null) {
return this.pointcutDeclarationScope.getClassLoader();
}
return ClassUtils.getDefaultClassLoader();
}
/**
* Build the underlying AspectJ pointcut expression.
*/
private PointcutExpression buildPointcutExpression(@Nullable ClassLoader classLoader) {
PointcutParser parser = initializePointcutParser(classLoader);
PointcutParameter[] pointcutParameters = new PointcutParameter[this.pointcutParameterNames.length];
for (int i = 0; i < pointcutParameters.length; i++) {
pointcutParameters[i] = parser.createPointcutParameter(
this.pointcutParameterNames[i], this.pointcutParameterTypes[i]);
}
return parser.parsePointcutExpression(replaceBooleanOperators(resolveExpression()),
this.pointcutDeclarationScope, pointcutParameters);
}
private String resolveExpression() {
String expression = getExpression();
Assert.state(expression != null, "No expression set");
return expression;
}
/**
* Initialize the underlying AspectJ pointcut parser.
*/
private PointcutParser initializePointcutParser(@Nullable ClassLoader classLoader) {
PointcutParser parser = PointcutParser
.getPointcutParserSupportingSpecifiedPrimitivesAndUsingSpecifiedClassLoaderForResolution(
SUPPORTED_PRIMITIVES, classLoader);
parser.registerPointcutDesignatorHandler(new BeanPointcutDesignatorHandler());
return parser;
}
/**
* If a pointcut expression has been specified in XML, the user cannot
* write {@code and} as "&&" (though && will work).
* We also allow {@code and} between two pointcut sub-expressions.
* <p>This method converts back to {@code &&} for the AspectJ pointcut parser.
*/
private String replaceBooleanOperators(String pcExpr) {
String result = StringUtils.replace(pcExpr, " and ", " && ");
result = StringUtils.replace(result, " or ", " || ");
result = StringUtils.replace(result, " not ", " ! ");
return result;
}
/**
* Return the underlying AspectJ pointcut expression.
*/
public PointcutExpression getPointcutExpression() {
return obtainPointcutExpression();
}
@Override
public boolean matches(Class<?> targetClass) {
PointcutExpression pointcutExpression = obtainPointcutExpression();
try {
try {
return pointcutExpression.couldMatchJoinPointsInType(targetClass);
}
catch (ReflectionWorldException ex) {
logger.debug("PointcutExpression matching rejected target class - trying fallback expression", ex);
// Actually this is still a "maybe" - treat the pointcut as dynamic if we don't know enough yet
PointcutExpression fallbackExpression = getFallbackPointcutExpression(targetClass);
if (fallbackExpression != null) {
return fallbackExpression.couldMatchJoinPointsInType(targetClass);
}
}
}
catch (Throwable ex) {
logger.debug("PointcutExpression matching rejected target class", ex);
}
return false;
}
@Override
public boolean matches(Method method, Class<?> targetClass, boolean hasIntroductions) {
obtainPointcutExpression();
ShadowMatch shadowMatch = getTargetShadowMatch(method, targetClass);
// Special handling for this, target, @this, @target, @annotation
// in Spring - we can optimize since we know we have exactly this class,
// and there will never be matching subclass at runtime.
if (shadowMatch.alwaysMatches()) {
return true;
}
else if (shadowMatch.neverMatches()) {
return false;
}
else {
// the maybe case
if (hasIntroductions) {
return true;
}
// A match test returned maybe - if there are any subtype sensitive variables
// involved in the test (this, target, at_this, at_target, at_annotation) then
// we say this is not a match as in Spring there will never be a different
// runtime subtype.
RuntimeTestWalker walker = getRuntimeTestWalker(shadowMatch);
return (!walker.testsSubtypeSensitiveVars() || walker.testTargetInstanceOfResidue(targetClass));
}
}
@Override
public boolean matches(Method method, Class<?> targetClass) {
return matches(method, targetClass, false);
}
@Override
public boolean isRuntime() {
return obtainPointcutExpression().mayNeedDynamicTest();
}
@Override
public boolean matches(Method method, Class<?> targetClass, Object... args) {
obtainPointcutExpression();
ShadowMatch shadowMatch = getTargetShadowMatch(method, targetClass);
// Bind Spring AOP proxy to AspectJ "this" and Spring AOP target to AspectJ target,
// consistent with return of MethodInvocationProceedingJoinPoint
ProxyMethodInvocation pmi = null;
Object targetObject = null;
Object thisObject = null;
try {
MethodInvocation mi = ExposeInvocationInterceptor.currentInvocation();
targetObject = mi.getThis();
if (!(mi instanceof ProxyMethodInvocation)) {
throw new IllegalStateException("MethodInvocation is not a Spring ProxyMethodInvocation: " + mi);
}
pmi = (ProxyMethodInvocation) mi;
thisObject = pmi.getProxy();
}
catch (IllegalStateException ex) {
// No current invocation...
if (logger.isDebugEnabled()) {
logger.debug("Could not access current invocation - matching with limited context: " + ex);
}
}
try {
JoinPointMatch joinPointMatch = shadowMatch.matchesJoinPoint(thisObject, targetObject, args);
/*
* Do a final check to see if any this(TYPE) kind of residue match. For
* this purpose, we use the original method's (proxy method's) shadow to
* ensure that 'this' is correctly checked against. Without this check,
* we get incorrect match on this(TYPE) where TYPE matches the target
* type but not 'this' (as would be the case of JDK dynamic proxies).
* <p>See SPR-2979 for the original bug.
*/
if (pmi != null && thisObject != null) { // there is a current invocation
RuntimeTestWalker originalMethodResidueTest = getRuntimeTestWalker(getShadowMatch(method, method));
if (!originalMethodResidueTest.testThisInstanceOfResidue(thisObject.getClass())) {
return false;
}
if (joinPointMatch.matches()) {
bindParameters(pmi, joinPointMatch);
}
}
return joinPointMatch.matches();
}
catch (Throwable ex) {
if (logger.isDebugEnabled()) {
logger.debug("Failed to evaluate join point for arguments " + Arrays.toString(args) +
" - falling back to non-match", ex);
}
return false;
}
}
@Nullable
protected String getCurrentProxiedBeanName() {
return ProxyCreationContext.getCurrentProxiedBeanName();
}
/**
* Get a new pointcut expression based on a target class's loader rather than the default.
*/
@Nullable
private PointcutExpression getFallbackPointcutExpression(Class<?> targetClass) {
try {
ClassLoader classLoader = targetClass.getClassLoader();
if (classLoader != null && classLoader != this.pointcutClassLoader) {
return buildPointcutExpression(classLoader);
}
}
catch (Throwable ex) {
logger.debug("Failed to create fallback PointcutExpression", ex);
}
return null;
}
private RuntimeTestWalker getRuntimeTestWalker(ShadowMatch shadowMatch) {
if (shadowMatch instanceof DefensiveShadowMatch) {
return new RuntimeTestWalker(((DefensiveShadowMatch) shadowMatch).primary);
}
return new RuntimeTestWalker(shadowMatch);
}
private void bindParameters(ProxyMethodInvocation invocation, JoinPointMatch jpm) {
// Note: Can't use JoinPointMatch.getClass().getName() as the key, since
// Spring AOP does all the matching at a join point, and then all the invocations
// under this scenario, if we just use JoinPointMatch as the key, then
// 'last man wins' which is not what we want at all.
// Using the expression is guaranteed to be safe, since 2 identical expressions
// are guaranteed to bind in exactly the same way.
invocation.setUserAttribute(resolveExpression(), jpm);
}
private ShadowMatch getTargetShadowMatch(Method method, Class<?> targetClass) {
Method targetMethod = AopUtils.getMostSpecificMethod(method, targetClass);
if (targetMethod.getDeclaringClass().isInterface()) {
// Try to build the most specific interface possible for inherited methods to be
// considered for sub-interface matches as well, in particular for proxy classes.
// Note: AspectJ is only going to take Method.getDeclaringClass() into account.
Set<Class<?>> ifcs = ClassUtils.getAllInterfacesForClassAsSet(targetClass);
if (ifcs.size() > 1) {
try {
Class<?> compositeInterface = ClassUtils.createCompositeInterface(
ClassUtils.toClassArray(ifcs), targetClass.getClassLoader());
targetMethod = ClassUtils.getMostSpecificMethod(targetMethod, compositeInterface);
}
catch (IllegalArgumentException ex) {
// Implemented interfaces probably expose conflicting method signatures...
// Proceed with original target method.
}
}
}
return getShadowMatch(targetMethod, method);
}
private ShadowMatch getShadowMatch(Method targetMethod, Method originalMethod) {
// Avoid lock contention for known Methods through concurrent access...
ShadowMatch shadowMatch = this.shadowMatchCache.get(targetMethod);
if (shadowMatch == null) {
synchronized (this.shadowMatchCache) {
// Not found - now check again with full lock...
PointcutExpression fallbackExpression = null;
shadowMatch = this.shadowMatchCache.get(targetMethod);
if (shadowMatch == null) {
Method methodToMatch = targetMethod;
try {
try {
shadowMatch = obtainPointcutExpression().matchesMethodExecution(methodToMatch);
}
catch (ReflectionWorldException ex) {
// Failed to introspect target method, probably because it has been loaded
// in a special ClassLoader. Let's try the declaring ClassLoader instead...
try {
fallbackExpression = getFallbackPointcutExpression(methodToMatch.getDeclaringClass());
if (fallbackExpression != null) {
shadowMatch = fallbackExpression.matchesMethodExecution(methodToMatch);
}
}
catch (ReflectionWorldException ex2) {
fallbackExpression = null;
}
}
if (targetMethod != originalMethod && (shadowMatch == null ||
(shadowMatch.neverMatches() && Proxy.isProxyClass(targetMethod.getDeclaringClass())))) {
// Fall back to the plain original method in case of no resolvable match or a
// negative match on a proxy class (which doesn't carry any annotations on its
// redeclared methods).
methodToMatch = originalMethod;
try {
shadowMatch = obtainPointcutExpression().matchesMethodExecution(methodToMatch);
}
catch (ReflectionWorldException ex) {
// Could neither introspect the target class nor the proxy class ->
// let's try the original method's declaring class before we give up...
try {
fallbackExpression = getFallbackPointcutExpression(methodToMatch.getDeclaringClass());
if (fallbackExpression != null) {
shadowMatch = fallbackExpression.matchesMethodExecution(methodToMatch);
}
}
catch (ReflectionWorldException ex2) {
fallbackExpression = null;
}
}
}
}
catch (Throwable ex) {
// Possibly AspectJ 1.8.10 encountering an invalid signature
logger.debug("PointcutExpression matching rejected target method", ex);
fallbackExpression = null;
}
if (shadowMatch == null) {
shadowMatch = new ShadowMatchImpl(org.aspectj.util.FuzzyBoolean.NO, null, null, null);
}
else if (shadowMatch.maybeMatches() && fallbackExpression != null) {
shadowMatch = new DefensiveShadowMatch(shadowMatch,
fallbackExpression.matchesMethodExecution(methodToMatch));
}
this.shadowMatchCache.put(targetMethod, shadowMatch);
}
}
}
return shadowMatch;
}
@Override
public boolean equals(@Nullable Object other) {
if (this == other) {
return true;
}
if (!(other instanceof AspectJExpressionPointcut otherPc)) {
return false;
}
return ObjectUtils.nullSafeEquals(this.getExpression(), otherPc.getExpression()) &&
ObjectUtils.nullSafeEquals(this.pointcutDeclarationScope, otherPc.pointcutDeclarationScope) &&
ObjectUtils.nullSafeEquals(this.pointcutParameterNames, otherPc.pointcutParameterNames) &&
ObjectUtils.nullSafeEquals(this.pointcutParameterTypes, otherPc.pointcutParameterTypes);
}
@Override
public int hashCode() {
int hashCode = ObjectUtils.nullSafeHashCode(this.getExpression());
hashCode = 31 * hashCode + ObjectUtils.nullSafeHashCode(this.pointcutDeclarationScope);
hashCode = 31 * hashCode + ObjectUtils.nullSafeHashCode(this.pointcutParameterNames);
hashCode = 31 * hashCode + ObjectUtils.nullSafeHashCode(this.pointcutParameterTypes);
return hashCode;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder("AspectJExpressionPointcut: (");
for (int i = 0; i < this.pointcutParameterTypes.length; i++) {
sb.append(this.pointcutParameterTypes[i].getName());
sb.append(' ');
sb.append(this.pointcutParameterNames[i]);
if ((i+1) < this.pointcutParameterTypes.length) {
sb.append(", ");
}
}
sb.append(") ");
if (getExpression() != null) {
sb.append(getExpression());
}
else {
sb.append("<pointcut expression not set>");
}
return sb.toString();
}
//---------------------------------------------------------------------
// Serialization support
//---------------------------------------------------------------------
private void readObject(ObjectInputStream ois) throws IOException, ClassNotFoundException {
// Rely on default serialization, just initialize state after deserialization.
ois.defaultReadObject();
// Initialize transient fields.
// pointcutExpression will be initialized lazily by checkReadyToMatch()
this.shadowMatchCache = new ConcurrentHashMap<>(32);
}
/**
* Handler for the Spring-specific {@code bean()} pointcut designator
* extension to AspectJ.
* <p>This handler must be added to each pointcut object that needs to
* handle the {@code bean()} PCD. Matching context is obtained
* automatically by examining a thread local variable and therefore a matching
* context need not be set on the pointcut.
*/
private class BeanPointcutDesignatorHandler implements PointcutDesignatorHandler {
private static final String BEAN_DESIGNATOR_NAME = "bean";
@Override
public String getDesignatorName() {
return BEAN_DESIGNATOR_NAME;
}
@Override
public ContextBasedMatcher parse(String expression) {
return new BeanContextMatcher(expression);
}
}
/**
* Matcher class for the BeanNamePointcutDesignatorHandler.
* <p>Dynamic match tests for this matcher always return true,
* since the matching decision is made at the proxy creation time.
* For static match tests, this matcher abstains to allow the overall
* pointcut to match even when negation is used with the bean() pointcut.
*/
private class BeanContextMatcher implements ContextBasedMatcher {
private final NamePattern expressionPattern;
public BeanContextMatcher(String expression) {
this.expressionPattern = new NamePattern(expression);
}
@Override
@SuppressWarnings("rawtypes")
@Deprecated
public boolean couldMatchJoinPointsInType(Class someClass) {
return (contextMatch(someClass) == FuzzyBoolean.YES);
}
@Override
@SuppressWarnings("rawtypes")
@Deprecated
public boolean couldMatchJoinPointsInType(Class someClass, MatchingContext context) {
return (contextMatch(someClass) == FuzzyBoolean.YES);
}
@Override
public boolean matchesDynamically(MatchingContext context) {
return true;
}
@Override
public FuzzyBoolean matchesStatically(MatchingContext context) {
return contextMatch(null);
}
@Override
public boolean mayNeedDynamicTest() {
return false;
}
private FuzzyBoolean contextMatch(@Nullable Class<?> targetType) {
String advisedBeanName = getCurrentProxiedBeanName();
if (advisedBeanName == null) { // no proxy creation in progress
// abstain; can't return YES, since that will make pointcut with negation fail
return FuzzyBoolean.MAYBE;
}
if (BeanFactoryUtils.isGeneratedBeanName(advisedBeanName)) {
return FuzzyBoolean.NO;
}
if (targetType != null) {
boolean isFactory = FactoryBean.class.isAssignableFrom(targetType);
return FuzzyBoolean.fromBoolean(
matchesBean(isFactory ? BeanFactory.FACTORY_BEAN_PREFIX + advisedBeanName : advisedBeanName));
}
else {
return FuzzyBoolean.fromBoolean(matchesBean(advisedBeanName) ||
matchesBean(BeanFactory.FACTORY_BEAN_PREFIX + advisedBeanName));
}
}
private boolean matchesBean(String advisedBeanName) {
return BeanFactoryAnnotationUtils.isQualifierMatch(
this.expressionPattern::matches, advisedBeanName, beanFactory);
}
}
private static class DefensiveShadowMatch implements ShadowMatch {
private final ShadowMatch primary;
private final ShadowMatch other;
public DefensiveShadowMatch(ShadowMatch primary, ShadowMatch other) {
this.primary = primary;
this.other = other;
}
@Override
public boolean alwaysMatches() {
return this.primary.alwaysMatches();
}
@Override
public boolean maybeMatches() {
return this.primary.maybeMatches();
}
@Override
public boolean neverMatches() {
return this.primary.neverMatches();
}
@Override
public JoinPointMatch matchesJoinPoint(Object thisObject, Object targetObject, Object[] args) {
try {
return this.primary.matchesJoinPoint(thisObject, targetObject, args);
}
catch (ReflectionWorldException ex) {
return this.other.matchesJoinPoint(thisObject, targetObject, args);
}
}
@Override
public void setMatchingContext(MatchingContext aMatchContext) {
this.primary.setMatchingContext(aMatchContext);
this.other.setMatchingContext(aMatchContext);
}
}
}
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