关于spring的aop拦截的问题

public class ServiceA {

	private ServiceA  self;

	public void setSelf(ServiceA self) {
		this.self = self;
	}

	public String methodA(String str) {
		System.out.println("methodA: args=" + str);
		self.methodB("b");
		return "12345" + str;
	}

	private String methodB(String str) {
		System.out.println("methodB: args=" + str);
		self.methodC("c");
		return "12345" + str;
	}

	public String methodC(String str) {
		System.out.println("methodC: args=" + str);
		return "12345" + str;
	}
}

private static boolean isOverridable(Method method, Class targetClass) {
		if (Modifier.isPrivate(method.getModifiers())) {
			return false;
		}
		if (Modifier.isPublic(method.getModifiers()) || Modifier.isProtected(method.getModifiers())) {
			return true;
		}
		return getPackageName(method.getDeclaringClass()).equals(getPackageName(targetClass));
	}

	public static boolean canApply(Pointcut pc, Class targetClass, boolean hasIntroductions) {
		if (!pc.getClassFilter().matches(targetClass)) {
			return false;
		}

		MethodMatcher methodMatcher = pc.getMethodMatcher();
		IntroductionAwareMethodMatcher introductionAwareMethodMatcher = null;
		if (methodMatcher instanceof IntroductionAwareMethodMatcher) {
			introductionAwareMethodMatcher = (IntroductionAwareMethodMatcher) methodMatcher;
		}

		Set classes = new HashSet(ClassUtils.getAllInterfacesForClassAsSet(targetClass));
		classes.add(targetClass);
		for (Iterator it = classes.iterator(); it.hasNext();) {
			Class clazz = (Class) it.next();
			Method[] methods = clazz.getMethods();
			for (int j = 0; j < methods.length; j++) {
				if ((introductionAwareMethodMatcher != null &&
						introductionAwareMethodMatcher.matches(methods[j], targetClass, hasIntroductions)) ||
						methodMatcher.matches(methods[j], targetClass)) {
					return true;
				}
			}
		}

		return false;
	}

public class Impl2  {
	
	protected/public String testAop2() {
		System.out.println("234");
		return "1233";
	}
}

public class Impl2  {
	
	public String testAop2() {
		System.out.println("234");
		return "1233";
	}
}

public class Impl2  {
	
	protected String testAop2() {
		System.out.println("234");
		return "1233";
	}
}

public int accept(Method method) {
			if (AopUtils.isFinalizeMethod(method)) {
				logger.debug("Found finalize() method - using NO_OVERRIDE");
				return NO_OVERRIDE;
			}
			if (!this.advised.isOpaque() && method.getDeclaringClass().isInterface() &&
					method.getDeclaringClass().isAssignableFrom(Advised.class)) {
				if (logger.isDebugEnabled()) {
					logger.debug("Method is declared on Advised interface: " + method);
				}
				return DISPATCH_ADVISED;
			}
			// We must always proxy equals, to direct calls to this.
			if (AopUtils.isEqualsMethod(method)) {
				logger.debug("Found 'equals' method: " + method);
				return INVOKE_EQUALS;
			}
			// We must always calculate hashCode based on the proxy.
			if (AopUtils.isHashCodeMethod(method)) {
				logger.debug("Found 'hashCode' method: " + method);
				return INVOKE_HASHCODE;
			}
			Class targetClass = this.advised.getTargetClass();
			// Proxy is not yet available, but that shouldn't matter.
			List chain = this.advised.getInterceptorsAndDynamicInterceptionAdvice(method, targetClass);
			boolean haveAdvice = !chain.isEmpty();
			boolean exposeProxy = this.advised.isExposeProxy();
			boolean isStatic = this.advised.getTargetSource().isStatic();
			boolean isFrozen = this.advised.isFrozen();
			if (haveAdvice || !isFrozen) {
				// If exposing the proxy, then AOP_PROXY must be used.
				if (exposeProxy) {
					if (logger.isDebugEnabled()) {
						logger.debug("Must expose proxy on advised method: " + method);
					}
					return AOP_PROXY;
				}
				String key = method.toString();
				// Check to see if we have fixed interceptor to serve this method.
				// Else use the AOP_PROXY.
				if (isStatic && isFrozen && this.fixedInterceptorMap.containsKey(key)) {
					if (logger.isDebugEnabled()) {
						logger.debug("Method has advice and optimisations are enabled: " + method);
					}
					// We know that we are optimising so we can use the
					// FixedStaticChainInterceptors.
					int index = ((Integer) this.fixedInterceptorMap.get(key)).intValue();
					return (index + this.fixedInterceptorOffset);
				}
				else {
					if (logger.isDebugEnabled()) {
						logger.debug("Unable to apply any optimisations to advised method: " + method);
					}
					return AOP_PROXY;
				}
			}
			else {
				// See if the return type of the method is outside the class hierarchy
				// of the target type. If so we know it never needs to have return type
				// massage and can use a dispatcher.
				// If the proxy is being exposed, then must use the interceptor the
				// correct one is already configured. If the target is not static cannot
				// use a Dispatcher because the target can not then be released.
				if (exposeProxy || !isStatic) {
					return INVOKE_TARGET;
				}
				Class returnType = method.getReturnType();
				if (targetClass == returnType) {
					if (logger.isDebugEnabled()) {
						logger.debug("Method " + method +
								"has return type same as target type (may return this) - using INVOKE_TARGET");
					}
					return INVOKE_TARGET;
				}
				else if (returnType.isPrimitive() || !returnType.isAssignableFrom(targetClass)) {
					if (logger.isDebugEnabled()) {
						logger.debug("Method " + method +
								" has return type that ensures this cannot be returned- using DISPATCH_TARGET");
					}
					return DISPATCH_TARGET;
				}
				else {
					if (logger.isDebugEnabled()) {
						logger.debug("Method " + method +
								"has return type that is assignable from the target type (may return this) - " +
								"using INVOKE_TARGET");
					}
					return INVOKE_TARGET;
				}
			}
		}

	public List getInterceptorsAndDynamicInterceptionAdvice(Method method, Class targetClass) {
		MethodCacheKey cacheKey = new MethodCacheKey(method);
		List cached = (List) this.methodCache.get(cacheKey);
		if (cached == null) {
			cached = this.advisorChainFactory.getInterceptorsAndDynamicInterceptionAdvice(
					this, method, targetClass); //转调DefaultAdvisorChainFactory
			this.methodCache.put(cacheKey, cached);
		}
		return cached;
	}