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.util.Assert;
025import org.springframework.util.ClassUtils;
026
027/**
028 * Implementation of {@link AspectInstanceFactory} that locates the aspect from the
029 * {@link org.springframework.beans.factory.BeanFactory} using a configured bean name.
030 *
031 * @author Rob Harrop
032 * @author Juergen Hoeller
033 * @since 2.0
034 */
035public class SimpleBeanFactoryAwareAspectInstanceFactory implements AspectInstanceFactory, BeanFactoryAware {
036
037        private String aspectBeanName;
038
039        private BeanFactory beanFactory;
040
041
042        /**
043         * Set the name of the aspect bean. This is the bean that is returned when calling
044         * {@link #getAspectInstance()}.
045         */
046        public void setAspectBeanName(String aspectBeanName) {
047                this.aspectBeanName = aspectBeanName;
048        }
049
050        @Override
051        public void setBeanFactory(BeanFactory beanFactory) {
052                this.beanFactory = beanFactory;
053                Assert.notNull(this.aspectBeanName, "'aspectBeanName' is required");
054        }
055
056
057        /**
058         * Look up the aspect bean from the {@link BeanFactory} and returns it.
059         * @see #setAspectBeanName
060         */
061        @Override
062        public Object getAspectInstance() {
063                return this.beanFactory.getBean(this.aspectBeanName);
064        }
065
066        @Override
067        public ClassLoader getAspectClassLoader() {
068                if (this.beanFactory instanceof ConfigurableBeanFactory) {
069                        return ((ConfigurableBeanFactory) this.beanFactory).getBeanClassLoader();
070                }
071                else {
072                        return ClassUtils.getDefaultClassLoader();
073                }
074        }
075
076        @Override
077        public int getOrder() {
078                if (this.beanFactory.isSingleton(this.aspectBeanName) &&
079                                this.beanFactory.isTypeMatch(this.aspectBeanName, Ordered.class)) {
080                        return ((Ordered) this.beanFactory.getBean(this.aspectBeanName)).getOrder();
081                }
082                return Ordered.LOWEST_PRECEDENCE;
083        }
084
085}