日本免费高清视频-国产福利视频导航-黄色在线播放国产-天天操天天操天天操天天操|www.shdianci.com

學無先后，達者為師

網站首頁 編程語言 正文

SpringCloudAlibaba-3.分布式事務（Seata）

作者：萌萌虎兒 更新時間： 2022-08-28 編程語言

目錄

一、概念

1.1 問題引入

1.2 Seata介紹?

1.3 AT模式

?二、Seata的環境配置

三、演示

3.1 建數據庫表

3.2 訂單模塊

3.3 庫存模塊

3.4 賬戶模塊

3.5 測試

一、概念

1.1 問題引入

? ? ? ? 在分布式環境中，單體應用被拆分成微服務應用，原來的三個模塊被拆分成三個獨立的應用，分別使用三個獨立的數據源，業務操作需要調用三個服務來完成。此時每個服務內部的數據一致性由本地事務來保證，但是全局的數據一致性問題沒法保證。????????

?????????一句話來說：一次業務操作需要跨多個數據源或需要跨多個系統進行遠程調用，就會產生分布式事務問題

1.2 Seata介紹?

????????Seata是一款開源的分布式事務解決方案，致力于在微服務架構下提供高性能和簡單易用的分布式事務服務。

????????Seata 中有三大模塊，分別是 TM、RM 和 TC。 其中 TM 和 RM 是作為 Seata 的客戶端與業務系統集成在一起，TC 作為 Seata 的服務端獨立部署。

????????分布式事務處理過程的一ID+三組件模型

?????????????Transaction ID XID：全局唯一的事務ID

????????Transaction Coordinator (TC)：事務協調器，維護全局事務的運行狀態，負責協調并驅動全局事務的提交或回滾；

????????Transaction Manager (TM)：控制全局事務的邊界，負責開啟一個全局事務，并最終發起全局提交或全局回滾的決議；

????????Resource Manager (RM)：控制分支事務，負責分支注冊、狀態匯報，并接收事務協調器的指令，驅動分支（本地）事務的提交和回滾

? ? ? ? 分布式事務執行的過程：

1.TM 向 TC 注冊全局事務，全局事務創建成功并生成一個全局唯一的 XID；
2.XID 在微服務調用鏈路的上下文中傳播；
3.RM 向 TC 注冊分支事務，將其納入 XID 對應全局事務的管轄（根據業務要求編排數據庫、服務等事務內資源）；
4.TM 向 TC 通知針對 XID 的全局提交/回滾決議；（一階段結束）

5.TC匯總事務信息，決定分布式事務是提交還是回滾；
6.TC 通知 XID 下管轄的全部分支事務(RM)完成提交/回滾請求。（二階段結束）

?通俗解釋TM、TC、RM的關系（班主任打算開線上班會）：

? ? ? ? ????????班長（TM）、班主任（TC）、學生（RM）

? ? ? ? 1.班長：”王主任，馬上到上網課的時間了，你把房間號發一下吧！”

? ? ? ? 2.班主任：”好的，小王。房間號是8848，我發在班級群里了！”

? ? ? ? 3.同學們看到了群消息，各自打開XX會議，進入了8848房間... ...

? ? ? ? 4.班長：”王主任，同學們基本都到齊了，我看您可以開始講了！”（一階段結束）

? ? ? ? 5.班主任突然接到了一通神秘的電話... ....

? ? ? ? 6.稍等片刻后，班主任：”同學們，我現在通知一個事情（同學們沒白等O(∩_∩)O）/不好意思浪費各位的時間，通知臨時取消，散了吧（同學們白等了這么長時間 ┭┮﹏┭┮）......“（二階段結束）?

1.3 AT模式

? ? ? ? AT模式是seata提供的默認模式，是一種對業務無任何侵入的分布式事務解決方案

????????在 AT 模式下，用戶只需關注自己的“業務 SQL”，用戶的 “業務 SQL”?作為一階段，Seata 框架會自動生成事務的二階段提交和回滾操作。?

????????AT模式如何做到無侵入？

????????在一階段，Seata 會攔截“業務 SQL”

1 ?解析 SQL 語義，找到“業務 SQL”要更新的業務數據，在業務數據被更新前，將其保存成“before image”，
2 ?執行“業務 SQL”更新業務數據，

3.在業務數據更新之后，其保存成“after image”，最后生成行鎖。
????????以上操作全部在一個數據庫事務內完成，這樣保證了一階段操作的原子性。

????????（before image、after image都在保存在?undolog?中）?

????????二階段如是順利提交的話（業務順利執行），因為“業務 SQL”在一階段已經提交至數據庫，所以Seata框架只需將一階段保存的快照數據和行鎖刪掉，完成數據清理即可。?

????????二階段如果是回滾的話（業務某環節出錯拋異常），Seata 就需要回滾一階段已經執行的“業務 SQL”，還原業務數據。回滾方式便是用“before image”還原業務數據；但在還原前要首先要校驗臟寫，對比“數據庫當前業務數據”和 “after image”，如果兩份數據完全一致就說明沒有臟寫，可以還原業務數據，如果不一致就說明有臟寫，出現臟寫就需要轉人工處理。

?????????當全局回滾發生時，server會發送一個回滾消息到client端，client接到回滾通知后，通過xid跟branchid找到對應的undolog，獲取到事務執行前后的數據鏡像，解析成反向sql進行補償。

?二、Seata的環境配置

? ? ? ? 1.首先準備好壓縮包，例如：seata-server-0.9.0

? ? ? ? 2.解壓壓縮包，打開 conf/file.conf?

? ? ? ? ? ? ? ? 2.1 修改server模塊的組名，名字隨意

? ? ? ? ? ? ? ? ?2.2 修改數據庫的信息

????????注：我用的是mysql8.x，url和driver-class-name與mysql5.x都有所不同，并且需要去lib文件夾內刪除原來的mysql-connecter-java.jar , 把8.x版本的jar包拷貝進去

在這里插入圖片描述

? ? ? ? ?3.修改 conf/registry.conf ，配置nacos的地址

? ? ? ? ?4.在數據庫中創建seata數據庫，執行 conf/db_store.sql 腳本（若conf內沒有就去官網找）

? ? ? ? ?5.在啟動了nacos的前提下去執行 bin/seata-server.bat

三、演示

????????這里我們會創建三個服務，一個訂單服務，一個庫存服務，一個賬戶服務。
????????當用戶下單時，會在訂單服務中創建一個訂單，然后通過遠程調用庫存服務來扣減下單商品的庫存，再通過遠程調用賬戶服務來扣減用戶賬戶里面的余額，最后在訂單服務中修改訂單狀態為已完成。
? ? ? ? ?該操作跨越三個數據庫，有兩次遠程調用，很明顯會有分布式事務問題。

3.1 建數據庫表

1.CREATE DATABASE seata_order;      #訂單
CREATE TABLE t_order (
  `id` BIGINT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY,
  `user_id` BIGINT(11) DEFAULT NULL COMMENT '用戶id',
  `product_id` BIGINT(11) DEFAULT NULL COMMENT '產品id',
  `count` INT(11) DEFAULT NULL COMMENT '數量',
  `money` DECIMAL(11,0) DEFAULT NULL COMMENT '金額',
  `status` INT(1) DEFAULT NULL COMMENT '訂單狀態：0：創建中；1：已完結' 
) ENGINE=INNODB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8;

2.CREATE DATABASE seata_storage;    #庫存

CREATE TABLE t_storage (
 `id` BIGINT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY,
 `product_id` BIGINT(11) DEFAULT NULL COMMENT '產品id',
 `total` INT(11) DEFAULT NULL COMMENT '總庫存',
 `used` INT(11) DEFAULT NULL COMMENT '已用庫存',
 `residue` INT(11) DEFAULT NULL COMMENT '剩余庫存'
) ENGINE=INNODB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;
 
 
INSERT INTO seata_storage.t_storage(`id`, `product_id`, `total`, `used`, `residue`)
VALUES ('1', '1', '100', '0', '100');

3.CREATE DATABASE seata_account;    #賬戶

CREATE TABLE t_account (
  `id` BIGINT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY COMMENT 'id',
  `user_id` BIGINT(11) DEFAULT NULL COMMENT '用戶id',
  `total` DECIMAL(10,0) DEFAULT NULL COMMENT '總額度',
  `used` DECIMAL(10,0) DEFAULT NULL COMMENT '已用余額',
  `residue` DECIMAL(10,0) DEFAULT '0' COMMENT '剩余可用額度'
) ENGINE=INNODB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;
 
INSERT INTO seata_account.t_account(`id`, `user_id`, `total`, `used`, `residue`)  VALUES ('1', '1', '1000', '0', '1000');

?????????按照上述3庫分別建對應的回滾日志表，腳本為conf/db_undo_log.sql，若沒有去官網下

drop table `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;

3.2 訂單模塊

? ? ? ? 1.新建Order-Module

? ? ? ? 2.POM

    <dependencies>
        <!--nacos-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <!--seata-->
        <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>0.9.0</version>
        </dependency>
        <!--feign-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
        <!--web-actuator-->
        <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>
        <!--mysql-druid-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.26</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>

? ? ? ? 3.YML

server:
  port: 2001

spring:
  application:
    name: seata-order-service
  cloud:
    alibaba:
      seata:
        #自定義事務組名稱需要與seata-server中的對應
        tx-service-group: wz_tx_group
    nacos:
      discovery:
        server-addr: localhost:8848
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/seata_order?serverTimeZone=UTC
    username: root
    password: xxx

feign:
  hystrix:
    enabled: false

logging:
  level:
    io:
      seata: info

mybatis:
  mapperLocations: classpath*:mapper/*.xml

? ? ? ? 4.domain

@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);
    }
}
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Order
{
    private Long id;

    private Long userId;

    private Long productId;

    private Integer count;

    private BigDecimal money;

    /**
     * 訂單狀態：0：創建中；1：已完結
     */
    private Integer status;
}

? ? ? ? 5.Dao與mapper.xml

@Mapper
public interface OrderDao {

    /**
     * 創建訂單
     */
    void create(Order order);

    /**
     * 修改訂單金額
     */
    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="com.atguigu.springcloud.alibaba.dao.OrderDao">

    <resultMap id="BaseResultMap" type="com.atguigu.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>

? ? ? ? 6.Service

public interface OrderService {

    /**
     * 創建訂單
     */
    void create(Order order);
}
@Service
@Slf4j
public class OrderServiceImpl implements OrderService
{
    @Resource
    private OrderDao orderDao;

    @Resource
    private StorageService storageService;

    @Resource
    private AccountService accountService;

    /**
     * 創建訂單->調用庫存服務扣減庫存->調用賬戶服務扣減賬戶余額->修改訂單狀態
     * 簡單說：
     * 下訂單->減庫存->減余額->改狀態
     */
    @Override
    @GlobalTransactional(name = "fsp-create-order",rollbackFor = Exception.class)
    public void create(Order order) {
        log.info("------->下單開始");
        //本應用創建訂單
        orderDao.create(order);

        //遠程調用庫存服務扣減庫存
        log.info("------->order-service中扣減庫存開始");
        storageService.decrease(order.getProductId(),order.getCount());
        log.info("------->order-service中扣減庫存結束");

        //遠程調用賬戶服務扣減余額
        log.info("------->order-service中扣減余額開始");
        accountService.decrease(order.getUserId(),order.getMoney());
        log.info("------->order-service中扣減余額結束");

        //修改訂單狀態為已完成
        log.info("------->order-service中修改訂單狀態開始");
        orderDao.update(order.getUserId(),0);
        log.info("------->order-service中修改訂單狀態結束");

        log.info("------->下單結束");
    }
}
@FeignClient(value = "seata-storage-service")
public interface StorageService {

    /**
     * 扣減庫存
     */
    @PostMapping(value = "/storage/decrease")
    CommonResult decrease(@RequestParam("productId") Long productId, @RequestParam("count") Integer count);
}
@FeignClient(value = "seata-account-service")
public interface AccountService {

    /**
     * 扣減賬戶余額
     */
    //@RequestMapping(value = "/account/decrease", method = RequestMethod.POST, produces = "application/json; charset=UTF-8")
    @PostMapping("/account/decrease")
    CommonResult decrease(@RequestParam("userId") Long userId, @RequestParam("money") BigDecimal money);
}

? ? ? ? 7.Controller

@RestController
public class OrderController {

    @Autowired
    private OrderService orderService;

    /**
     * 創建訂單
     */
    @GetMapping("/order/create")
    public CommonResult create( Order order) {
        orderService.create(order);
        return new CommonResult(200, "訂單創建成功!");
    }
}

? ? ? ? 8.Config

@Configuration
@MapperScan({"com.atguigu.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();
    }

}

? ? ? ? 9.主啟動

@EnableDiscoveryClient
@EnableFeignClients
@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)//取消數據源的自動創建
public class SeataOrderMainApp2001
{

    public static void main(String[] args)
    {
        SpringApplication.run(SeataOrderMainApp2001.class, args);
    }
}

? ? ? ? 10.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.wz_tx_group = "default" #修改自定義事務組名稱

  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.cj.jdbc.Driver"
    url = "jdbc:mysql://127.0.0.1:3306/seata?serverTimeZone=UTC"
    user = "root"
    password = "xxx"
    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
  }
}

? ? ? ? 11.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"
  }
}

3.3 庫存模塊

? ? ? ? 1.新建Storage-Module

? ? ? ? 2.POM

    <dependencies>
        <!--nacos-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <!--seata-->
        <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>0.9.0</version>
        </dependency>
        <!--feign-->
        <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-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.0.0</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.26</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.10</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
    </dependencies>

? ? ? ? 3.YML

server:
  port: 2002

spring:
  application:
    name: seata-storage-service
  cloud:
    alibaba:
      seata:
        tx-service-group: wz_tx_group
    nacos:
      discovery:
        server-addr: localhost:8848
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/seata_storage?serverTimeZone=UTC
    username: root
    password: xxx

logging:
  level:
    io:
      seata: info

mybatis:
  mapperLocations: classpath*:mapper/*.xml

? ? ? ? 4.domain

@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);
    }
}
@Data
public class Storage {

    private Long id;

    /**
     * 產品id
     */
    private Long productId;

    /**
     * 總庫存
     */
    private Integer total;

    /**
     * 已用庫存
     */
    private Integer used;

    /**
     * 剩余庫存
     */
    private Integer residue;
}

? ? ? ? 5.Dao

@Mapper
public interface StorageDao {

    //扣減庫存
    void decrease(@Param("productId") Long productId, @Param("count") Integer count);
}

? ? ? ? 6.Service

public interface StorageService {
    /**
     * 扣減庫存
     */
    void decrease(Long productId, Integer count);
}
@Service
public class StorageServiceImpl implements StorageService {

    private static final Logger LOGGER = LoggerFactory.getLogger(StorageServiceImpl.class);

    @Resource
    private StorageDao storageDao;

    /**
     * 扣減庫存
     */
    @Override
    public void decrease(Long productId, Integer count) {
        LOGGER.info("------->storage-service中扣減庫存開始");
        storageDao.decrease(productId,count);
        LOGGER.info("------->storage-service中扣減庫存結束");
    }
}

? ? ? ? 7.Controller

@RestController
public class StorageController {

    @Autowired
    private StorageService storageService;

    /**
     * 扣減庫存
     */
    @RequestMapping("/storage/decrease")
    public CommonResult decrease(Long productId, Integer count) {
        storageService.decrease(productId, count);
        return new CommonResult(200,"扣減庫存成功！");
    }
}

? ? ? ? 8.Config

@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();
    }

}
@Configuration
@MapperScan({"com.atguigu.springcloud.alibaba.dao"})
public class MyBatisConfig {
}

? ? ? ? 9.主啟動

@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)
@EnableDiscoveryClient
@EnableFeignClients
public class SeataStorageServiceApplication2002
{
    public static void main(String[] args)
    {
        SpringApplication.run(SeataStorageServiceApplication2002.class, args);
    }
}

? ? ? ? 10.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->rgroup
  vgroup_mapping.wz_tx_group = "default"
  #only support single node
  default.grouplist = "127.0.0.1:8091"
  #degrade current not support
  enableDegrade = false
  #disable
  disable = false
  #unit ms,s,m,h,d represents milliseconds, seconds, minutes, hours, days, default permanent
  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 {
  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"
}

support {
  ## spring
  spring {
    # auto proxy the DataSource bean
    datasource.autoproxy = false
  }
}

? ? ? ? 11.registry.conf?

registry {
  # file 、nacos 、eureka、redis、zk
  type = "nacos"

  nacos {
    serverAddr = "localhost:8848"
    namespace = ""
    cluster = "default"
  }
  eureka {
    serviceUrl = "http://localhost:8761/eureka"
    application = "default"
    weight = "1"
  }
  redis {
    serverAddr = "localhost:6381"
    db = "0"
  }
  zk {
    cluster = "default"
    serverAddr = "127.0.0.1:2181"
    session.timeout = 6000
    connect.timeout = 2000
  }
  file {
    name = "file.conf"
  }
}

config {
  # file、nacos 、apollo、zk
  type = "file"

  nacos {
    serverAddr = "localhost"
    namespace = ""
    cluster = "default"
  }
  apollo {
    app.id = "fescar-server"
    apollo.meta = "http://192.168.1.204:8801"
  }
  zk {
    serverAddr = "127.0.0.1:2181"
    session.timeout = 6000
    connect.timeout = 2000
  }
  file {
    name = "file.conf"
  }
}

3.4 賬戶模塊

? ? ? ? 1.新建Account-Module

? ? ? ? 2.POM

<dependencies>
        <!--nacos-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <!--seata-->
        <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>0.9.0</version>
        </dependency>
        <!--feign-->
        <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-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.0.0</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.26</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.10</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
    </dependencies>

? ? ? ? 3.YML

server:
  port: 2003

spring:
  application:
    name: seata-account-service
  cloud:
    alibaba:
      seata:
        tx-service-group: wz_tx_group
    nacos:
      discovery:
        server-addr: localhost:8848
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/seata_account?serverTimeZone=UTC
    username: root
    password: xxx

feign:
  hystrix:
    enabled: false

logging:
  level:
    io:
      seata: info

mybatis:
  mapperLocations: classpath*:mapper/*.xml

? ? ? ? 4.domain

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Account {

    private Long id;

    /**
     * 用戶id
     */
    private Long userId;

    /**
     * 總額度
     */
    private BigDecimal total;

    /**
     * 已用額度
     */
    private BigDecimal used;

    /**
     * 剩余額度
     */
    private BigDecimal residue;
}

@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);
    }
}

? ? ? ? 5.Dao

@Mapper
public interface AccountDao {

    /**
     * 扣減賬戶余額
     */
    void decrease(@Param("userId") Long userId, @Param("money") BigDecimal money);
}

? ? ? ? 6.Service

public interface AccountService {

    /**
     * 扣減賬戶余額
     * @param userId 用戶id
     * @param money 金額
     */
    void decrease(@RequestParam("userId") Long userId, @RequestParam("money") BigDecimal money);
}
@Service
public class AccountServiceImpl implements AccountService {

    private static final Logger LOGGER = LoggerFactory.getLogger(AccountServiceImpl.class);


    @Resource
    AccountDao accountDao;

    /**
     * 扣減賬戶余額
     */
    @Override
    public void decrease(Long userId, BigDecimal money) {
        LOGGER.info("------->account-service中扣減賬戶余額開始");
        //模擬超時異常，全局事務回滾
        //暫停幾秒鐘線程
        try { TimeUnit.SECONDS.sleep(20); } catch (InterruptedException e) { e.printStackTrace(); }
        accountDao.decrease(userId,money);
        LOGGER.info("------->account-service中扣減賬戶余額結束");
    }
}

? ? ? ? 7.Controller

@RestController
public class AccountController {

    @Resource
    AccountService accountService;

    /**
     * 扣減賬戶余額
     */
    @RequestMapping("/account/decrease")
    public CommonResult decrease(@RequestParam("userId") Long userId, @RequestParam("money") BigDecimal money){
        accountService.decrease(userId,money);
        return new CommonResult(200,"扣減賬戶余額成功！");
    }
}

? ? ? ? 8.Config

@Configuration
@MapperScan({"com.atguigu.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();
    }

}

? ? ? ? 9.主啟動

@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)
@EnableDiscoveryClient
@EnableFeignClients
public class SeataAccountMainApp2003
{
    public static void main(String[] args)
    {
        SpringApplication.run(SeataAccountMainApp2003.class, args);
    }
}

????????10.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.wz_tx_group = "default" #修改自定義事務組名稱

  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.cj.jdbc.Driver"
    url = "jdbc:mysql://172.0.0.1:3306/seata_account?serverTimeZone=UTC"
    user = "root"
    password = "xxx"
    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
  }
}

? ? ? ? 11.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"
  }
}

3.5 測試

? ? ? ? 注意我們在AccountServiceImpl添加超時：

//模擬超時異常，全局事務回滾
//暫停幾秒鐘線程
        try { TimeUnit.SECONDS.sleep(20); } ... ...

? ? ? ? 輸入：

http://localhost:2001/order/create?userId=1&productId=1&count=10&money=100

? ? ? ? 直接報錯了，查看數據庫的數據，沒有任何改變。

? ? ? ? 如果我們把OrderServiceImpl中的@GlobalTransactional注解去掉，再嘗試，也會報錯，但會發現這樣的BUG：錢已經扣了，但訂單狀態仍顯示未完成！

?

原文鏈接：https://blog.csdn.net/weixin_62427168/article/details/126558693

欄目分類
最近更新