001/* 002 * Copyright 2002-2017 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * https://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.aop.config; 018 019import org.springframework.aop.aspectj.AspectInstanceFactory; 020import org.springframework.beans.factory.BeanFactory; 021import org.springframework.beans.factory.BeanFactoryAware; 022import org.springframework.beans.factory.config.ConfigurableBeanFactory; 023import org.springframework.core.Ordered; 024import org.springframework.lang.Nullable; 025import org.springframework.util.Assert; 026import org.springframework.util.ClassUtils; 027 028/** 029 * Implementation of {@link AspectInstanceFactory} that locates the aspect from the 030 * {@link org.springframework.beans.factory.BeanFactory} using a configured bean name. 031 * 032 * @author Rob Harrop 033 * @author Juergen Hoeller 034 * @since 2.0 035 */ 036public class SimpleBeanFactoryAwareAspectInstanceFactory implements AspectInstanceFactory, BeanFactoryAware { 037 038 @Nullable 039 private String aspectBeanName; 040 041 @Nullable 042 private BeanFactory beanFactory; 043 044 045 /** 046 * Set the name of the aspect bean. This is the bean that is returned when calling 047 * {@link #getAspectInstance()}. 048 */ 049 public void setAspectBeanName(String aspectBeanName) { 050 this.aspectBeanName = aspectBeanName; 051 } 052 053 @Override 054 public void setBeanFactory(BeanFactory beanFactory) { 055 this.beanFactory = beanFactory; 056 Assert.notNull(this.aspectBeanName, "'aspectBeanName' is required"); 057 } 058 059 060 /** 061 * Look up the aspect bean from the {@link BeanFactory} and returns it. 062 * @see #setAspectBeanName 063 */ 064 @Override 065 public Object getAspectInstance() { 066 Assert.state(this.beanFactory != null, "No BeanFactory set"); 067 Assert.state(this.aspectBeanName != null, "No 'aspectBeanName' set"); 068 return this.beanFactory.getBean(this.aspectBeanName); 069 } 070 071 @Override 072 @Nullable 073 public ClassLoader getAspectClassLoader() { 074 if (this.beanFactory instanceof ConfigurableBeanFactory) { 075 return ((ConfigurableBeanFactory) this.beanFactory).getBeanClassLoader(); 076 } 077 else { 078 return ClassUtils.getDefaultClassLoader(); 079 } 080 } 081 082 @Override 083 public int getOrder() { 084 if (this.beanFactory != null && this.aspectBeanName != null && 085 this.beanFactory.isSingleton(this.aspectBeanName) && 086 this.beanFactory.isTypeMatch(this.aspectBeanName, Ordered.class)) { 087 return ((Ordered) this.beanFactory.getBean(this.aspectBeanName)).getOrder(); 088 } 089 return Ordered.LOWEST_PRECEDENCE; 090 } 091 092}