Seata分布式事务框架示例

一、背景

阿里给出了Seata的官方示例，地址: https://github.com/seata/seata-samples, 提供了很多示例：

• springcloud-seata-sharding-jdbc-mybatis-plus-samplesEasy to understand, high availability，Integration example of Spring Cloud，Seata,ShardingJdbc,MyBatisPlus.
• spring-cloud-alibaba-samples - Spring Cloud Alibaba + Nacos + Dubbo + OpenFeign + Sentinel + Seata
• dubbo - Integration example of Seata and Apache Dubbo
• springboot - Integration example of Seata and Spring Boot
• nacos - Integration example of Seata、 Apache Dubbo and Alibaba Nacos
• springboot-dubbo-seata - Integration example of Seata、 Apache Dubbo and Spring Boot
• nutzboot-dubbo-seata - Integration example of Seata、 Apache Dubbo and NutzBoot
• springcloud-jpa-seata - Integration example of Seata and Spring Cloud and JPA
• spring-boot-multiple-datasource - Integration example of Seata and Spring Boot with multiple datasource and MyBatis
• springboot-mybatis - Integration example of Seata and Spring Boot and Mybatis
• api - Non-Spring environment uses api to build Seata distributed transactions
• spring-boot-multiple-datasource-mybatis-plus - Integration example of Seata and Spring Boot with multiple datasource and MyBatisPlus
• springcloud-nacos-seata - Integration example of Seata and Spring Cloud and Alibaba Nacos
• saga - Saga mode distributed transaction demo projects
• dubbo-multiple-datasource-mybatis-plus Integration example of Seata and Spring Boot Apache Dubbo with dynamic multiple datasource and MyBatisPlus and Alibaba Nacos

本文以springboot-mybatis为例，该示例中有5个module:

• sbm-account-service
• sbm-business-service
• sbm-common-service
• sbm-order-service
• sbm-storage-service

二、环境部署

2.1 mysql DB建表

示例中提供了mysql的建表语句，位置：seata-samples/springboot-mybatis/sql/all_in_one.sql

建了3个DB, 详情如下：

2.2 Seata-Server 下载

官网下载：http://seata.io/zh-cn/blog/download.html

2.3 Seata-Server 配置

/conf/application.yml, seata3个节点(config、register、store)有多重配置方式，为了简单演示，这里采用默认file方式，其他方式可以参考application.example.yml

seata:
  config:
    # support: nacos, consul, apollo, zk, etcd3
    type: file
  registry:
    # support: nacos, eureka, redis, zk, consul, etcd3, sofa
    type: file
  store:
    # support: file 、 db 、 redis
    mode: file

2.4 Seata-Server 启动

sh /bin/seata-server.sh

启动日志：seata/logs/start.out

main] i.s.core.rpc.netty.NettyServerBootstrap  : Server started, service listen port: 8091

默认启动接口：8091

三、服务启动

分别启动4个服务，启动端口分别为：

四、测试

测试服务位置：sbm-business-service/src/main/java/io/seata/samples/business/controller/BusinessController.java

/**
     * 购买下单，模拟全局事务提交
     *
     * @return
     */
    @RequestMapping("/purchase/commit")
    public Boolean purchaseCommit(HttpServletRequest request) {
        businessService.purchase("1001", "2001", 1);
        return true;
    }

    /**
     * 购买下单，模拟全局事务回滚
     *
     * @return
     */
    @RequestMapping("/purchase/rollback")
    public Boolean purchaseRollback() {
        try {
            businessService.purchase("1002", "2001", 1);
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }

        return true;
    }

4.1 正常提交

http://localhost:8084/api/business/purchase/commit

4.2 异常提交

http://localhost:8084/api/business/purchase/rollback