001/*
002 * Copyright 2013 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 */
016package org.springframework.batch.core.jsr.configuration.support;
017
018import org.springframework.beans.BeansException;
019import org.springframework.beans.PropertyValue;
020import org.springframework.beans.factory.BeanFactory;
021import org.springframework.beans.factory.config.BeanDefinition;
022import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
023import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
024import org.springframework.beans.factory.config.RuntimeBeanReference;
025import org.springframework.beans.factory.support.AbstractBeanDefinition;
026import org.springframework.beans.factory.support.BeanDefinitionBuilder;
027import org.springframework.beans.factory.support.DefaultListableBeanFactory;
028import org.springframework.core.PriorityOrdered;
029
030/**
031 * After the {@link BeanFactory} is created, this post processor will evaluate to see
032 * if any of the beans referenced from a job definition (as defined by JSR-352) point
033 * to class names instead of bean names.  If this is the case, a new {@link BeanDefinition}
034 * is added with the name of the class as the bean name.
035 *
036 * @author Michael Minella
037 * @since 3.0
038 */
039public class ThreadLocalClassloaderBeanPostProcessor implements BeanFactoryPostProcessor, PriorityOrdered {
040        /* (non-Javadoc)
041         * @see org.springframework.beans.factory.config.BeanFactoryPostProcessor#postProcessBeanFactory(org.springframework.beans.factory.config.ConfigurableListableBeanFactory)
042         */
043        @Override
044        public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
045                String[] beanNames = beanFactory.getBeanDefinitionNames();
046
047                for (String curName : beanNames) {
048                        BeanDefinition beanDefinition = beanFactory.getBeanDefinition(curName);
049                        PropertyValue[] values = beanDefinition.getPropertyValues().getPropertyValues();
050
051                        for (PropertyValue propertyValue : values) {
052                                Object value = propertyValue.getValue();
053
054                                if(value instanceof RuntimeBeanReference) {
055                                        RuntimeBeanReference ref = (RuntimeBeanReference) value;
056                                        if(!beanFactory.containsBean(ref.getBeanName())) {
057                                                AbstractBeanDefinition newBeanDefinition = BeanDefinitionBuilder.genericBeanDefinition(ref.getBeanName()).getBeanDefinition();
058                                                newBeanDefinition.setScope("step");
059                                                ((DefaultListableBeanFactory) beanFactory).registerBeanDefinition(ref.getBeanName(), newBeanDefinition);
060                                        }
061                                }
062                        }
063                }
064        }
065
066        /**
067         * Sets this {@link BeanFactoryPostProcessor} to the lowest precedence so that
068         * it is executed as late as possible in the chain of {@link BeanFactoryPostProcessor}s
069         */
070        @Override
071        public int getOrder() {
072                return PriorityOrdered.LOWEST_PRECEDENCE;
073        }
074}