/**
* Copyright (C) 2012 Ryan W Tenney (ryan@10e.us)
*
* 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 com.ryantenney.metrics.spring;
import org.aopalliance.aop.Advice;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.aop.Advisor;
import org.springframework.aop.Pointcut;
import org.springframework.aop.framework.Advised;
import org.springframework.aop.framework.AopInfrastructureBean;
import org.springframework.aop.framework.ProxyConfig;
import org.springframework.aop.framework.ProxyFactory;
import org.springframework.aop.support.AopUtils;
import org.springframework.aop.support.DefaultPointcutAdvisor;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.util.ClassUtils;
class AdvisingBeanPostProcessor implements BeanPostProcessor {
private static final Logger LOG = LoggerFactory.getLogger(AdvisingBeanPostProcessor.class);
private final ClassLoader beanClassLoader = ClassUtils.getDefaultClassLoader();
private final Pointcut pointcut;
private final AdviceFactory adviceFactory;
private final ProxyConfig proxyConfig;
public AdvisingBeanPostProcessor(final Pointcut pointcut, final AdviceFactory adviceFactory, final ProxyConfig proxyConfig) {
this.pointcut = pointcut;
this.adviceFactory = adviceFactory;
this.proxyConfig = proxyConfig;
}
@Override
public Object postProcessBeforeInitialization(Object bean, String beanName) {
return bean;
}
@Override
public Object postProcessAfterInitialization(Object bean, String beanName) {
if (bean instanceof AopInfrastructureBean) {
return bean;
}
final Class<?> targetClass = AopUtils.getTargetClass(bean);
if (AopUtils.canApply(pointcut, targetClass)) {
final Advice advice = adviceFactory.getAdvice(bean, targetClass);
final Advisor advisor = new DefaultPointcutAdvisor(pointcut, advice);
if (bean instanceof Advised) {
LOG.debug("Bean {} is already proxied, adding Advisor to existing proxy", beanName);
((Advised) bean).addAdvisor(0, advisor);
return bean;
}
else {
LOG.debug("Proxying bean {} of type {}", beanName, targetClass.getCanonicalName());
final ProxyFactory proxyFactory = new ProxyFactory(bean);
if (proxyConfig != null) {
proxyFactory.copyFrom(proxyConfig);
}
proxyFactory.addAdvisor(advisor);
final Object proxy = proxyFactory.getProxy(this.beanClassLoader);
return proxy;
}
}
return bean;
}
}