org.bytesoft.bytetcc.supports.spring.CompensableContextPostProcessor.java Source code

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Here is the source code for org.bytesoft.bytetcc.supports.spring.CompensableContextPostProcessor.java

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/**
 * Copyright 2014-2016 yangming.liu<bytefox@126.com>.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, see <http://www.gnu.org/licenses/>.
 */
package org.bytesoft.bytetcc.supports.spring;

import java.util.ArrayList;
import java.util.List;

import org.bytesoft.bytetcc.supports.spring.aware.CompensableContextAware;
import org.bytesoft.compensable.CompensableBeanFactory;
import org.bytesoft.compensable.CompensableContext;
import org.bytesoft.compensable.aware.CompensableBeanFactoryAware;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.BeansException;
import org.springframework.beans.FatalBeanException;
import org.springframework.beans.MutablePropertyValues;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.config.RuntimeBeanReference;

public class CompensableContextPostProcessor implements BeanPostProcessor, CompensableBeanFactoryAware {
    static final Logger logger = LoggerFactory.getLogger(CompensableBeanFactoryPostProcessor.class);

    private CompensableBeanFactory beanFactory;

    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
        if (CompensableContextAware.class.isInstance(bean)) {
            CompensableContextAware aware = (CompensableContextAware) bean;
            CompensableContext compensableContext = this.beanFactory.getCompensableContext();
            aware.setCompensableContext(compensableContext);
        }
        return bean;
    }

    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
        return bean;
    }

    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
        ClassLoader cl = Thread.currentThread().getContextClassLoader();

        String targetBeanId = null;
        List<BeanDefinition> beanDefList = new ArrayList<BeanDefinition>();
        String[] beanNameArray = beanFactory.getBeanDefinitionNames();
        for (int i = 0; i < beanNameArray.length; i++) {
            String beanName = beanNameArray[i];
            BeanDefinition beanDef = beanFactory.getBeanDefinition(beanName);
            String beanClassName = beanDef.getBeanClassName();

            Class<?> beanClass = null;
            try {
                beanClass = cl.loadClass(beanClassName);
            } catch (Exception ex) {
                logger.debug("Cannot load class {}, beanId= {}!", beanClassName, beanName, ex);
                continue;
            }

            if (CompensableContextAware.class.isAssignableFrom(beanClass)) {
                beanDefList.add(beanDef);
            }

            if (CompensableContext.class.isAssignableFrom(beanClass)) {
                if (targetBeanId == null) {
                    targetBeanId = beanName;
                } else {
                    throw new FatalBeanException("Duplicated compensable-context defined.");
                }
            }

        }

        for (int i = 0; targetBeanId != null && i < beanDefList.size(); i++) {
            BeanDefinition beanDef = beanDefList.get(i);
            MutablePropertyValues mpv = beanDef.getPropertyValues();
            RuntimeBeanReference beanRef = new RuntimeBeanReference(targetBeanId);
            mpv.addPropertyValue(CompensableContextAware.COMPENSABLE_CONTEXT_FIELD_NAME, beanRef);
        }

    }

    public CompensableBeanFactory getBeanFactory() {
        return beanFactory;
    }

    public void setBeanFactory(CompensableBeanFactory beanFactory) {
        this.beanFactory = beanFactory;
    }

}