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/*
 * Copyright 2002-2020 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.context.annotation;

import java.util.Set;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.aop.config.AopConfigUtils;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.core.annotation.AnnotationAttributes;
import org.springframework.core.type.AnnotationMetadata;

/**
 * Registers an auto proxy creator against the current {@link BeanDefinitionRegistry}
 * as appropriate based on an {@code @Enable*} annotation having {@code mode} and
 * {@code proxyTargetClass} attributes set to the correct values.
 *
 * @author Chris Beams
 * @since 3.1
 * @see org.springframework.cache.annotation.EnableCaching
 * @see org.springframework.transaction.annotation.EnableTransactionManagement
 */
public class AutoProxyRegistrar implements ImportBeanDefinitionRegistrar {

	private final Log logger = LogFactory.getLog(getClass());

	/**
	 * Register, escalate, and configure the standard auto proxy creator (APC) against the
	 * given registry. Works by finding the nearest annotation declared on the importing
	 * {@code @Configuration} class that has both {@code mode} and {@code proxyTargetClass}
	 * attributes. If {@code mode} is set to {@code PROXY}, the APC is registered; if
	 * {@code proxyTargetClass} is set to {@code true}, then the APC is forced to use
	 * subclass (CGLIB) proxying.
	 * 

Several {@code @Enable*} annotations expose both {@code mode} and * {@code proxyTargetClass} attributes. It is important to note that most of these * capabilities end up sharing a {@linkplain AopConfigUtils#AUTO_PROXY_CREATOR_BEAN_NAME * single APC}. For this reason, this implementation doesn't "care" exactly which * annotation it finds -- as long as it exposes the right {@code mode} and * {@code proxyTargetClass} attributes, the APC can be registered and configured all * the same. */ @Override public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) { boolean candidateFound = false; Set annTypes = importingClassMetadata.getAnnotationTypes(); for (String annType : annTypes) { AnnotationAttributes candidate = AnnotationConfigUtils.attributesFor(importingClassMetadata, annType); if (candidate == null) { continue; } Object mode = candidate.get("mode"); Object proxyTargetClass = candidate.get("proxyTargetClass"); if (mode != null && proxyTargetClass != null && AdviceMode.class == mode.getClass() && Boolean.class == proxyTargetClass.getClass()) { candidateFound = true; if (mode == AdviceMode.PROXY) { AopConfigUtils.registerAutoProxyCreatorIfNecessary(registry); if ((Boolean) proxyTargetClass) { AopConfigUtils.forceAutoProxyCreatorToUseClassProxying(registry); return; } } } } if (!candidateFound && logger.isInfoEnabled()) { String name = getClass().getSimpleName(); logger.info(String.format("%s was imported but no annotations were found " + "having both 'mode' and 'proxyTargetClass' attributes of type " + "AdviceMode and boolean respectively. This means that auto proxy " + "creator registration and configuration may not have occurred as " + "intended, and components may not be proxied as expected. Check to " + "ensure that %s has been @Import'ed on the same class where these " + "annotations are declared; otherwise remove the import of %s " + "altogether.", name, name, name)); } } }





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