/*
* Copyright 2002-2009 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
*
* 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.springframework.aop.aspectj.annotation;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.util.ClassUtils;
/**
* {@link org.springframework.aop.aspectj.AspectInstanceFactory} implementation
* backed by a Spring {@link org.springframework.beans.factory.BeanFactory}.
*
* <p>Note that this may instantiate multiple times if using a prototype,
* which probably won't give the semantics you expect.
* Use a {@link LazySingletonAspectInstanceFactoryDecorator}
* to wrap this to ensure only one new aspect comes back.
*
* @author Rod Johnson
* @author Juergen Hoeller
* @since 2.0
* @see org.springframework.beans.factory.BeanFactory
* @see LazySingletonAspectInstanceFactoryDecorator
*/
public class BeanFactoryAspectInstanceFactory implements MetadataAwareAspectInstanceFactory {
private final BeanFactory beanFactory;
private final String name;
private final AspectMetadata aspectMetadata;
/**
* Create a BeanFactoryAspectInstanceFactory. AspectJ will be called to
* introspect to create AJType metadata using the type returned for the
* given bean name from the BeanFactory.
* @param beanFactory BeanFactory to obtain instance(s) from
* @param name name of the bean
*/
public BeanFactoryAspectInstanceFactory(BeanFactory beanFactory, String name) {
this(beanFactory, name, beanFactory.getType(name));
}
/**
* Create a BeanFactoryAspectInstanceFactory, providing a type that AspectJ should
* introspect to create AJType metadata. Use if the BeanFactory may consider the type
* to be a subclass (as when using CGLIB), and the information should relate to a superclass.
* @param beanFactory BeanFactory to obtain instance(s) from
* @param name the name of the bean
* @param type the type that should be introspected by AspectJ
*/
public BeanFactoryAspectInstanceFactory(BeanFactory beanFactory, String name, Class type) {
this.beanFactory = beanFactory;
this.name = name;
this.aspectMetadata = new AspectMetadata(type, name);
}
public Object getAspectInstance() {
return this.beanFactory.getBean(this.name);
}
public ClassLoader getAspectClassLoader() {
if (this.beanFactory instanceof ConfigurableBeanFactory) {
return ((ConfigurableBeanFactory) this.beanFactory).getBeanClassLoader();
}
else {
return ClassUtils.getDefaultClassLoader();
}
}
public AspectMetadata getAspectMetadata() {
return this.aspectMetadata;
}
/**
* Determine the order for this factory's target aspect, either
* an instance-specific order expressed through implementing the
* {@link org.springframework.core.Ordered} interface (only
* checked for singleton beans), or an order expressed through the
* {@link org.springframework.core.annotation.Order} annotation
* at the class level.
* @see org.springframework.core.Ordered
* @see org.springframework.core.annotation.Order
*/
public int getOrder() {
Class<?> type = this.beanFactory.getType(this.name);
if (type != null) {
if (Ordered.class.isAssignableFrom(type) && this.beanFactory.isSingleton(this.name)) {
return ((Ordered) this.beanFactory.getBean(this.name)).getOrder();
}
Order order = type.getAnnotation(Order.class);
if (order != null) {
return order.value();
}
}
return Ordered.LOWEST_PRECEDENCE;
}
@Override
public String toString() {
return getClass().getSimpleName() + ": bean name '" + this.name + "'";
}
}