/*
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* Copyright [2020-2030] [https://www.stylefeng.cn]
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Guns采用APACHE LICENSE 2.0开源协议，您在使用过程中，需要注意以下几点：
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*
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* 1.请不要删除和修改根目录下的LICENSE文件。
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* 2.请不要删除和修改Guns源码头部的版权声明。
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* 3.请保留源码和相关描述文件的项目出处，作者声明等。
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* 4.分发源码时候，请注明软件出处 https://gitee.com/stylefeng/guns
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* 5.在修改包名，模块名称，项目代码等时，请注明软件出处 https://gitee.com/stylefeng/guns
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* 6.若您的项目无法满足以上几点，可申请商业授权
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*/
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package cn.stylefeng.roses.kernel.dsctn.aop;
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import cn.stylefeng.roses.kernel.dsctn.api.annotation.DataSource;
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import cn.stylefeng.roses.kernel.dsctn.api.context.CurrentDataSourceContext;
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import lombok.extern.slf4j.Slf4j;
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import org.aspectj.lang.ProceedingJoinPoint;
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import org.aspectj.lang.Signature;
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import org.aspectj.lang.annotation.Around;
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import org.aspectj.lang.annotation.Aspect;
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import org.aspectj.lang.annotation.Pointcut;
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import org.aspectj.lang.reflect.MethodSignature;
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import org.springframework.core.Ordered;
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import java.lang.reflect.Method;
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import static cn.stylefeng.roses.kernel.dsctn.api.constants.DatasourceContainerConstants.MASTER_DATASOURCE_NAME;
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import static cn.stylefeng.roses.kernel.dsctn.api.constants.DatasourceContainerConstants.MULTI_DATA_SOURCE_EXCHANGE_AOP;
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/**
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* 多数据源切换的AOP，切的是 DataSource 注解
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*
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* @author fengshuonan
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* @date 2020/10/31 22:55
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*/
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@Aspect
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@Slf4j
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public class MultiSourceExchangeAop implements Ordered {
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@Pointcut(value = "@annotation(cn.stylefeng.roses.kernel.dsctn.api.annotation.DataSource)")
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private void cutService() {
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}
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@Around("cutService()")
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public Object around(ProceedingJoinPoint point) throws Throwable {
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// 获取被aop拦截的方法
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Signature signature = point.getSignature();
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MethodSignature methodSignature = null;
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if (!(signature instanceof MethodSignature)) {
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throw new IllegalArgumentException("该注解只能用于方法");
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}
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methodSignature = (MethodSignature) signature;
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Object target = point.getTarget();
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Method currentMethod = target.getClass().getMethod(methodSignature.getName(), methodSignature.getParameterTypes());
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// 获取方法上的DataSource注解
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DataSource datasource = currentMethod.getAnnotation(DataSource.class);
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// 如果有DataSource注解，则设置DataSourceContextHolder为注解上的名称
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if (datasource != null) {
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CurrentDataSourceContext.setDataSourceName(datasource.name());
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log.debug("设置数据源为：" + datasource.name());
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} else {
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CurrentDataSourceContext.setDataSourceName(MASTER_DATASOURCE_NAME);
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log.debug("设置数据源为：dataSourceCurrent");
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}
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try {
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return point.proceed();
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} finally {
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log.debug("清空数据源信息！");
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CurrentDataSourceContext.clearDataSourceName();
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}
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}
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/**
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* aop的顺序要早于spring的事务
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*
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* @author fengshuonan
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* @date 2020/10/31 22:55
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*/
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@Override
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public int getOrder() {
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return MULTI_DATA_SOURCE_EXCHANGE_AOP;
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}
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}
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