SpringCloudAlibaba--Seata简单案例(一)

深藏阁楼爱情的钟 2021-08-27 14:44 358阅读 0赞

### Seata业务数据库准备 ###

这里会创建3个服务，一个订单服务，一个库存服务，一个账户服务。

当用户下单时，会在订单服务中创建一个订单，然后通过RPC调用库存服务来扣减下单商品的库存，再通过远程调用账户服务来扣减用户账户里面的余额，最后在订单服务中修改订单状态为已完成。

该操作跨越3个数据库，有两次远程调用，很明显会有分布式事务问题。

**创建业务数据库：**

*  seata\_order：存储订单的数据库；
 *  seata\_storage：存储库存的数据库
 *  seata\_account：存储账户信息的数据库

![在这里插入图片描述][2020032313394621.png]

**建业务表：**

*  seata\_order库下建t\_order表

CREATE TABLE t_order(
     `id` BIGINT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY,
     `user_id` BIGINT(11) DEFAULT NULL COMMENT '用户id',
     `product_id` BIGINT(11) DEFAULT NULL COMMENT '产品id',
     `count` INT(11) DEFAULT NULL COMMENT '数量',
     `money` DECIMAL(11, 0) DEFAULT NULL COMMENT '金额',
     `status` INT(1) DEFAULT NULL COMMENT '订单状态：0：创建中；1：已完成'
    )ENGINE=INNODB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8;

*  seata\_storage库下建t\_storage表

CREATE TABLE t_storage(
    	`id` BIGINT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY,
    	`product_id` BIGINT(11) DEFAULT NULL COMMENT '产品id',
    	`total` INT(11) DEFAULT NULL COMMENT '总库存',
    	`used` INT(11) DEFAULT NULL COMMENT '已用库存',
    	`residue` INT(11) DEFAULT NULL COMMENT '剩余库存'
    )ENGINE=INNODB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;
    
    INSERT INTO t_storage VALUES(1, 1, 100, 0, 100);

*  在seata\_account库下建t\_account表

CREATE TABLE t_account(
    	`id` BIGINT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY COMMENT 'id',
    	`user_id` BIGINT(11) DEFAULT NULL COMMENT '用户id',
    	`total` DECIMAL(10, 0) DEFAULT NULL COMMENT '总额度',
    	`used` DECIMAL(10, 0) DEFAULT NULL COMMENT '已用余额',
    	`residue` DECIMAL(10, 0) DEFAULT '0' COMMENT '剩余可用额度'
    )ENGINE=INNODB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;
    
    INSERT INTO t_account VALUES(1, 1, 1000, 0, 1000);

**建对应的回滚日志表：**

订单、库存、账户3个库下都需要建各自的回滚日志表

-- 此脚本必须初始化在你当前的业务数据库中，用于AT模式XID记录。与server端无关
    -- 增加唯一索引ux_undo_log
    
    CREATE TABLE `undo_log` (
      `id` bigint(20) NOT NULL AUTO_INCREMENT,
      `branch_id` bigint(20) NOT NULL,
      `xid` varchar(100) NOT NULL,
      `context` varchar(128) NOT NULL,
      `rollback_info` longblob NOT NULL,
      `log_status` int(11) NOT NULL,
      `log_created` datetime NOT NULL,
      `log_modified` datetime NOT NULL,
      `ext` varchar(100) DEFAULT NULL,
      PRIMARY KEY (`id`),
      UNIQUE KEY `ux_undo_log` (`xid`,`branch_id`)
    ) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70]

### 订单/库存/账户业务微服务准备 ###

业务需求：下订单 -> 减库存 -> 扣余额 -> 改订单状态

**新建Order-Module：**

1.  seata-order-service2001
2.  pom.xml

<dependencies>
            
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            </dependency>
            
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-starter-alibaba-seata</artifactId>
                <exclusions>
                    <exclusion>
                        <artifactId>seata-all</artifactId>
                        <groupId>io.seata</groupId>
                    </exclusion>
                </exclusions>
            </dependency>
            <dependency>
                <groupId>io.seata</groupId>
                <artifactId>seata-all</artifactId>
                <version>1.0.0</version>
            </dependency>
            
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-openfeign</artifactId>
            </dependency>
            
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-actuator</artifactId>
            </dependency>
            
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>5.1.37</version>
            </dependency>
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid-spring-boot-starter</artifactId>
                <version>1.1.10</version>
            </dependency>
            <dependency>
                <groupId>org.mybatis.spring.boot</groupId>
                <artifactId>mybatis-spring-boot-starter</artifactId>
                <version>2.0.0</version>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <optional>true</optional>
            </dependency>
        </dependencies>

1.  application.yml

server:
      port: 2001
    
    spring:
      application:
        name: seata-order-service
      cloud:
        alibaba:
          seata:
            tx-service-group: fsp_tx_group #自定义组名称，需要与seata-server中配置的对应
        nacos:
          discovery:
            server-addr: localhost:8848
    
      datasource:
        driver-class-name: com.mysql.jdbc.Driver
        url: jdbc:mysql://localhost:3306/seata_order
        username: root
        password: 123456
    
    feign:
      hystrix:
        enabled: false
    
    logging:
      level: 
        io:
          seata: info
          
    mybatis:
      mapperLocations: classpath:mapper/*.xml

1.  file.conf

transport {
      # tcp udt unix-domain-socket
      type = "TCP"
      #NIO NATIVE
      server = "NIO"
      #enable heartbeat
      heartbeat = true
      #thread factory for netty
      thread-factory {
        boss-thread-prefix = "NettyBoss"
        worker-thread-prefix = "NettyServerNIOWorker"
        server-executor-thread-prefix = "NettyServerBizHandler"
        share-boss-worker = false
        client-selector-thread-prefix = "NettyClientSelector"
        client-selector-thread-size = 1
        client-worker-thread-prefix = "NettyClientWorkerThread"
        # netty boss thread size,will not be used for UDT
        boss-thread-size = 1
        #auto default pin or 8
        worker-thread-size = 8
      }
      shutdown {
        # when destroy server, wait seconds
        wait = 3
      }
      serialization = "seata"
      compressor = "none"
    }
    
    service {
    
      vgroup_mapping.fsp_tx_group = "default" #修改自定义事务组名称
    
      default.grouplist = "127.0.0.1:8091"
      enableDegrade = false
      disable = false
      max.commit.retry.timeout = "-1"
      max.rollback.retry.timeout = "-1"
      disableGlobalTransaction = false
    }
    
    
    client {
      async.commit.buffer.limit = 10000
      lock {
        retry.internal = 10
        retry.times = 30
      }
      report.retry.count = 5
      tm.commit.retry.count = 1
      tm.rollback.retry.count = 1
    }
    
    ## transaction log store
    store {
      ## store mode: file、db
      mode = "db"
    
      ## file store
      file {
        dir = "sessionStore"
    
        # branch session size , if exceeded first try compress lockkey, still exceeded throws exceptions
        max-branch-session-size = 16384
        # globe session size , if exceeded throws exceptions
        max-global-session-size = 512
        # file buffer size , if exceeded allocate new buffer
        file-write-buffer-cache-size = 16384
        # when recover batch read size
        session.reload.read_size = 100
        # async, sync
        flush-disk-mode = async
      }
    
      ## database store
      db {
        ## the implement of javax.sql.DataSource, such as DruidDataSource(druid)/BasicDataSource(dbcp) etc.
        datasource = "dbcp"
        ## mysql/oracle/h2/oceanbase etc.
        db-type = "mysql"
        driver-class-name = "com.mysql.jdbc.Driver"
        url = "jdbc:mysql://127.0.0.1:3306/seata"
        user = "root"
        password = "123456"
        min-conn = 1
        max-conn = 3
        global.table = "global_table"
        branch.table = "branch_table"
        lock-table = "lock_table"
        query-limit = 100
      }
    }
    lock {
      ## the lock store mode: local、remote
      mode = "remote"
    
      local {
        ## store locks in user's database
      }
    
      remote {
        ## store locks in the seata's server
      }
    }
    recovery {
      #schedule committing retry period in milliseconds
      committing-retry-period = 1000
      #schedule asyn committing retry period in milliseconds
      asyn-committing-retry-period = 1000
      #schedule rollbacking retry period in milliseconds
      rollbacking-retry-period = 1000
      #schedule timeout retry period in milliseconds
      timeout-retry-period = 1000
    }
    
    transaction {
      undo.data.validation = true
      undo.log.serialization = "jackson"
      undo.log.save.days = 7
      #schedule delete expired undo_log in milliseconds
      undo.log.delete.period = 86400000
      undo.log.table = "undo_log"
    }
    
    ## metrics settings
    metrics {
      enabled = false
      registry-type = "compact"
      # multi exporters use comma divided
      exporter-list = "prometheus"
      exporter-prometheus-port = 9898
    }
    
    support {
      ## spring
      spring {
        # auto proxy the DataSource bean
        datasource.autoproxy = false
      }
    }

1.  registry.conf

registry {
      # file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
      type = "nacos"
    
      nacos {
        serverAddr = "localhost:8848"
        namespace = ""
        cluster = "default"
      }
      eureka {
        serviceUrl = "http://localhost:8761/eureka"
        application = "default"
        weight = "1"
      }
      redis {
        serverAddr = "localhost:6379"
        db = "0"
      }
      zk {
        cluster = "default"
        serverAddr = "127.0.0.1:2181"
        session.timeout = 6000
        connect.timeout = 2000
      }
      consul {
        cluster = "default"
        serverAddr = "127.0.0.1:8500"
      }
      etcd3 {
        cluster = "default"
        serverAddr = "http://localhost:2379"
      }
      sofa {
        serverAddr = "127.0.0.1:9603"
        application = "default"
        region = "DEFAULT_ZONE"
        datacenter = "DefaultDataCenter"
        cluster = "default"
        group = "SEATA_GROUP"
        addressWaitTime = "3000"
      }
      file {
        name = "file.conf"
      }
    }
    
    config {
      # file、nacos 、apollo、zk、consul、etcd3
      type = "file"
    
      nacos {
        serverAddr = "localhost"
        namespace = ""
      }
      consul {
        serverAddr = "127.0.0.1:8500"
      }
      apollo {
        app.id = "seata-server"
        apollo.meta = "http://192.168.1.204:8801"
      }
      zk {
        serverAddr = "127.0.0.1:2181"
        session.timeout = 6000
        connect.timeout = 2000
      }
      etcd3 {
        serverAddr = "http://localhost:2379"
      }
      file {
        name = "file.conf"
      }
    }

1.  domain

@Data
    @AllArgsConstructor
    @NoArgsConstructor
    public class Order { 
        
        private Long id;
        private Long userId;
        private Long productId;
        private Integer count;
        private BigDecimal money;
        
        /* 订单状态： 0：创建中；1：已完成； */
        private Integer status;
    }

@Data
    @AllArgsConstructor
    @NoArgsConstructor
    public class CommonResult<T> { 
        
        private Integer code;
        private String message;
        private T data;
        
        public CommonResult(Integer code, String message){ 
            this(code, message, null);
        }
    }

1.  Dao接口及实现

@Mapper
    public interface OrderDao { 
    
        //新建订单
        void create(Order order);
    
        //修改订单状态 0 -> 1
        void update(@Param("userId") Long userId, @Param("status") Integer status);
    
    }

<?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
    
    <mapper namespace="pers.zhang.springcloud.alibaba.dao.OrderDao">
    
        <resultMap id="BaseResultMap" type="pers.zhang.springcloud.alibaba.domain.Order">
            <id column="id" property="id" jdbcType="BIGINT"/>
            <result column="user_id" property="userId" jdbcType="BIGINT"/>
            <result column="product_id" property="productId" jdbcType="BIGINT"/>
            <result column="count" property="count" jdbcType="INTEGER"/>
            <result column="money" property="money" jdbcType="DECIMAL"/>
            <result column="status" property="status" jdbcType="INTEGER"/>
        </resultMap>
    
        <insert id="create">
            insert into t_order (id,user_id,product_id,count,money,status)
            values (null,#{userId},#{productId},#{count},#{money},0);
        </insert>
    
    
        <update id="update">
            update t_order set status = 1
            where user_id=#{userId} and status = #{status};
        </update>
    
    </mapper>

1.  Service接口及实现

public interface OrderService { 
        //创建订单
        void create(Order order);
    }

@Service
    @Slf4j
    public class OrderServiceImpl implements OrderService { 
    
        @Resource
        OrderDao orderDao;
    
        @Resource
        StorageService storageService;
    
        @Resource
        AccountService accountService;
    
        @Override
        public void create(Order order) { 
            log.info("------>开始新建订单");
            orderDao.create(order);
            log.info("------>订单微服务开始调用库存，扣减count");
            storageService.decrease(order.getProductId(), order.getCount());
            log.info("------>订单微服务开始调用库存，扣减end");
            log.info("------>订单微服务开始调用账户，扣减money");
            accountService.decrease(order.getUserId(), order.getMoney());
            log.info("------>订单微服务开始调用账户，扣减end");
            log.info("------>开始修改订单状态");
            orderDao.update(order.getUserId(), 0);
            log.info("------>修改订单状态完毕");
            log.info("------>下单完毕");
    
        }
    }

@FeignClient(value = "seata-account-service")
    public interface AccountService { 
        //扣减账户余额
        @PostMapping(value = "/account/decrease")
        CommonResult decrease(@RequestParam("userId") Long userId, @RequestParam("money") BigDecimal money);
    }

@FeignClient(value = "seata-storage-service")
    public interface StorageService { 
        //扣减库存
        @PostMapping(value = "/storage/decrease")
        CommonResult decrease(@RequestParam("productId") Long productId, @RequestParam("count") Integer count);
    }

1.  Controller

@RestController
    public class OrderController
    { 
        @Resource
        OrderService orderService;
    
        @GetMapping("/order/create")
        public CommonResult create(Order order) { 
            orderService.create(order);
            return new CommonResult(200,"订单创建成功");
        }
    }

1.  Config配置

@Configuration
    @MapperScan({ "pers.zhang.springcloud.alibaba.dao"})
    public class MyBatisConfig { 
    }

@Configuration
    public class DataSourceProxyConfig { 
    
        @Value("${mybatis.mapperLocations}")
        private String mapperLocations;
    
        @Bean
        @ConfigurationProperties(prefix = "spring.datasource")
        public DataSource druidDataSource(){ 
            return new DruidDataSource();
        }
    
        @Bean
        public DataSourceProxy dataSourceProxy(DataSource dataSource) { 
            return new DataSourceProxy(dataSource);
        }
    
        @Bean
        public SqlSessionFactory sqlSessionFactoryBean(DataSourceProxy dataSourceProxy) throws Exception { 
            SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
            sqlSessionFactoryBean.setDataSource(dataSourceProxy);
            sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(mapperLocations));
            sqlSessionFactoryBean.setTransactionFactory(new SpringManagedTransactionFactory());
            return sqlSessionFactoryBean.getObject();
        }
    
    }

1.  主启动类

@EnableFeignClients
    @EnableDiscoveryClient
    @SpringBootApplication(exclude = DataSourceAutoConfiguration.class)//取消数据源自动创建
    public class SeataOrderMainApp2001 { 
        public static void main(String[] args) { 
            SpringApplication.run(SeataOrderMainApp2001.class, args);
        }
    }

[2020032313394621.png]: /images/20210813/ab8fbfde19424dd0ad9f00521dabc06b.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70]: /images/20210813/020f119cbc9a43c6bca7d3cd10a1c180.png