/*
* Copyright 2009-2014 Jose Luis Martin.
*
* 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.jdal.aop.config;
import java.lang.reflect.AnnotatedElement;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jdal.annotation.AnnotatedElementAccessor;
import org.jdal.annotation.SerializableProxy;
import org.jdal.aop.SerializableProxyUtils;
import org.jdal.aop.SerializableAopProxy;
import org.springframework.aop.framework.AopInfrastructureBean;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.config.DependencyDescriptor;
import org.springframework.beans.factory.config.InstantiationAwareBeanPostProcessorAdapter;
import org.springframework.core.MethodParameter;
import org.springframework.core.ResolvableType;
import org.springframework.core.annotation.AnnotationUtils;
/**
* BeanPostProcessor that process {@link org.jdal.annotation.SerializableProxy} annotation
* for replacing fields or properties with serializable proxies.
*
* @author Jose Luis Martin
* @since 2.0
*/
public class SerializableAnnotationBeanPostProcessor extends InstantiationAwareBeanPostProcessorAdapter
implements BeanFactoryAware {
private static final Log log = LogFactory.getLog(SerializableAnnotationBeanPostProcessor.class);
private ConfigurableListableBeanFactory beanFactory;
@Override
public Object postProcessAfterInitialization(Object bean, String beanName)
throws BeansException {
// Check for already serializable, infraestructure or serializable proxy targets.
if (bean instanceof SerializableAopProxy ||
bean instanceof AopInfrastructureBean ||
beanName.startsWith(SerializableProxyUtils.TARGET_NAME_PREFIX))
return bean;
SerializableProxy ann = AnnotationUtils.findAnnotation(bean.getClass(), SerializableProxy.class);
if (ann != null) {
if (log.isDebugEnabled())
log.debug("Creating serializable proxy for bean [" + beanName + "]");
boolean proxyTargetClass = !beanFactory.getType(beanName).isInterface() || ann.proxyTargetClass();
return SerializableProxyUtils.createSerializableProxy(bean, proxyTargetClass, ann.useCache(), beanFactory, beanName);
}
return bean;
}
/**
* Create a serializable proxy from given object.
* @param value object to proxy
* @return a new serializable proxy
*/
protected Object getProxy(Object target, boolean proxyTargetClass, boolean useCache,
DependencyDescriptor descriptor, String beanName) {
return SerializableProxyUtils.createSerializableProxy(target, proxyTargetClass, useCache,
beanFactory, descriptor, beanName);
}
public BeanFactory getBeanFactory() {
return this.beanFactory;
}
/**
* {@inheritDoc}
*/
@Override
public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
this.beanFactory = (ConfigurableListableBeanFactory) beanFactory;
}
protected DependencyDescriptor getDependencyDescriptor(AnnotatedElement ae) {
return new DependencyDescriptor((Field) ae, false);
}
/**
* Lookup for {@link SerializableProxy} annotation on fields or methods and
* replace value with a Serializable proxy.
*/
@Override
public Object postProcessBeforeInitialization(Object bean, String beanName)
throws BeansException {
List<AnnotatedElement> elements = AnnotatedElementAccessor.findAnnotatedElements(SerializableProxy.class, bean.getClass());
for (AnnotatedElement element : elements) {
ResolvableType type = getResolvableType(element);
Object value = AnnotatedElementAccessor.getValue(element, bean);
if (value != null && !(value instanceof SerializableAopProxy)) {
SerializableProxy ann = AnnotationUtils.getAnnotation(element, SerializableProxy.class);
boolean proxyTargetClass = !type.resolve().isInterface() || ann.proxyTargetClass();
Object proxy = getProxy(value, proxyTargetClass, ann.useCache(),
getDependencyDescriptor(element), beanName);
if (proxy != null)
AnnotatedElementAccessor.setValue(element, bean, proxy);
}
}
return bean;
}
private ResolvableType getResolvableType(AnnotatedElement element) {
if (element instanceof Field)
return ResolvableType.forField((Field) element);
else if (element instanceof Method)
return ResolvableType.forMethodParameter(
new MethodParameter((Method) element, 0));
throw new IllegalArgumentException("SerializableProxy annotation should only be applied on types" +
", fields or methods but was found in [" + element.toString() + "]");
}
}