SpringCloud--分布式事务AT

转x33g5p2x  于2021-11-25 转载在 Spring  
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Storage

1.新建模块

2.修改pom.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <artifactId>order-parent</artifactId>
        <groupId>cn.tedu</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <groupId>cn.tedu</groupId>
    <artifactId>storage</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>storage</name>
</project>

3.修改yml文件

application.yml

spring:
  application:
    name: storage
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost/seata_storage?useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2B8
    username: root
    password: root

server:
  port: 8082

eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka
  instance:
    prefer-ip-address: true
    instance-id: ${spring.cloud.client.ip-address}:${spring.application.name}:${server.port}

mybatis-plus:
  type-aliases-package: cn.tedu.storage.entity
  mapper-locations:
    - classpath:/mapper/*Mapper.xml
  configuration:
    map-underscore-to-camel-case: true

logging:
  level:
    cn.tedu.storage.mapper: DEBUG

bootstrap.yml

spring:
  cloud:
    inetutils:
      preferred-networks:
        - 192\.168\.1\..+

4.实体类

package cn.tedu.storage.entity;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.experimental.Accessors;

@Data
@Accessors(chain = true)
@AllArgsConstructor
@NoArgsConstructor
public class Storage {
    private Long id;
    private Long productId;//产品id
    private Integer total;//总数
    private Integer used;//已售出
    private Integer residue;//可用库存
    private Integer frozen;//冻结库存
}

5.mapper.xml

<?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="cn.tedu.storage.mapper.StorageMapper" >
    <resultMap id="BaseResultMap" type="Storage" >
        <id column="id" property="id" jdbcType="BIGINT" />
        <result column="product_id" property="productId" jdbcType="BIGINT" />
        <result column="total" property="total" jdbcType="INTEGER" />
        <result column="used" property="used" jdbcType="INTEGER" />
        <result column="residue" property="residue" jdbcType="INTEGER" />
    </resultMap>
    <update id="decrease">
        UPDATE storage SET used = used + #{count},residue = residue - #{count} WHERE product_id = #{productId}
    </update>
</mapper>

6.service

StorageService

package cn.tedu.storage.service;

public interface StorageService {
    void decrease(Long productId,Integer count);
}

StorageServiceImpl

package cn.tedu.storage.service;

import cn.tedu.storage.mapper.StorageMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class StorageServiceImpl implements StorageService{
    @Autowired
    private StorageMapper storageMapper;
    @Override
    public void decrease(Long productId, Integer count) {

    }
}

7.controller

package cn.tedu.storage.controller;

import cn.tedu.storage.service.StorageService;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class StorageController {
    @Autowired
    private StorageService storageService;
    @GetMapping("/decrease")
    public String decrease(Long productId,Integer count){
        storageService.decrease(productId,count);
        return "减少库存成功";
    }
}

实现效果

Order

1. 新建模块order

2. 修改pom.xml文件

application.yml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <artifactId>order-parent</artifactId>
        <groupId>cn.tedu</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <groupId>cn.tedu</groupId>
    <artifactId>order</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>order</name>
</project>

3. 配置yml文件

spring:
  application:
    name: order

  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost/seata_order?useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2B8
    username: root
    password: root

server:
  port: 8083

eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka
  instance:
    prefer-ip-address: true
    instance-id: ${spring.cloud.client.ip-address}:${spring.application.name}:${server.port}

mybatis-plus:
  type-aliases-package: cn.tedu.order.entity
  mapper-locations:
    - classpath:/mapper/*Mapper.xml
  configuration:
    map-underscore-to-camel-case: true

logging:
  level:
    cn.tedu.order.mapper: DEBUG

bootstrap.yml

spring:
  cloud:
    inetutils:
      preferred-networks:
        - 192\.168\.1\..+

4.实体类

package cn.tedu.order.entity;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.experimental.Accessors;

import java.math.BigDecimal;

@Data
@NoArgsConstructor
@AllArgsConstructor
@Accessors(chain = true)
public class Order {
    private Long id;
    private Long userId;
    private Long productId;
    private Integer count;
    private BigDecimal money;
    private Integer status;
}

5. mapper

OrderMapper.xml

<?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="cn.tedu.order.mapper.OrderMapper" >
    <resultMap id="BaseResultMap" type="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 `order` (`id`,`user_id`,`product_id`,`count`,`money`,`status`)
        VALUES(#{id}, #{userId}, #{productId}, #{count}, #{money},1);
    </insert>
</mapper>

order为sql关键词 作为表名需要使用反引号包裹

7. service

package cn.tedu.order.service;

import cn.tedu.order.entity.Order;
import cn.tedu.order.mapper.OrderMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.Random;

@Service
public class OrderServiceImpl implements OrderService{
    @Autowired
    private OrderMapper orderMapper;

    @Override
    public void create(Order order) {
        // TODO: 2021/11/25 远程调用订单发号器 生产订单ID
        //先临时随机产生一个ID 完成发号器后此行代码可删除
        Long orderId=Math.abs(new Random().nextLong());
        orderMapper.create(order);
        // TODO: 2021/11/25 远程调用库存，减少库存
        // TODO: 2021/11/25 远程调用账户，扣减金额
    }
}

8. controller

package cn.tedu.order.controller;

import cn.tedu.order.entity.Order;
import cn.tedu.order.service.OrderService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class OrderController {
    @Autowired
    private OrderService orderService;
    @GetMapping("/create")
    public String create(Order order){
        orderService.create(order);
        return "订单增加成功";
    }
}

实现效果

全局唯一id发号器

1.下载网址：https://github.com/lookingatstarts/easyIdGenerator

2…导入：

3.添加eureka依赖

<dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>

4.添加bootstrap.yml

spring:
  cloud:
    inetutils:
      preferred-networks:
        - 192\.168\.1\..+

5.配置application.yml

server:
  port: 9090

easy-id-generator:
  snowflake:  #雪花算法
    enable: false
    zk:
      connection-string: 127.0.0.1:2181,127.0.0.1:2182,127.0.0.1:2183
    load-worker-id-from-file-when-zk-down: true  # 当zk不可访问时，从本地文件中读取之前备份的workerId
  segment: # 有数据库就可以运算
    enable: true
    db-list: ["db1","db2"]
    fetch-segment-retry-times: 3 # 从数据库获取号段失败重试次数
eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka
  instance:
    prefer-ip-address: true
spring:
  application:
    name: easy-id

6.seata_order.properties

jdbcUrl=jdbc:mysql:///seata_order?serverTimezone=GMT%2B8&autoReconnect=true&useUnicode=true&characterEncoding=UTF-8
driverClassName=com.mysql.cj.jdbc.Driver
dataSource.user=root
dataSource.password=root
dataSource.cachePrepStmts=true
dataSource.prepStmtCacheSize=250
dataSource.prepStmtCacheSqlLimit=2048

实现效果

访问http://localhost:9090/segment/ids/next_id?businessType=order_business

订单远程调用库存、账户和发号器

1.feign依赖

2.启动类注解

@EnableFeignClients

package cn.tedu.order;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.openfeign.EnableFeignClients;

@SpringBootApplication
@MapperScan("cn.tedu.order.mapper")
@EnableFeignClients
public class OrderApplication {
    public static void main(String[] args) {
        SpringApplication.run(OrderApplication.class, args);
    }
}

3.添加远程调用接口

storageclient

package cn.tedu.order.feign;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.RequestParam;

@FeignClient(name = "storage")
public interface StorageClient {
    String decrease(@RequestParam("productId") Long productId,
                    @RequestParam("count")Integer count);
}

accountclient

package cn.tedu.order.feign;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;

import java.math.BigDecimal;

@FeignClient(name = "account")
public interface AccountClient {
    @GetMapping("/decrease")
    String decrease(@RequestParam("userId") Long userId,
                    @RequestParam("money")BigDecimal money);
}

easy-idclient

package cn.tedu.order.feign;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;

@FeignClient(name = "easy-id")
public interface EasyIdClient {
    @GetMapping("/segment/ids/next_id")
    String getId(@RequestParam("businessType") String businessType);
}

4.修改orderserviceimpl完成远程调用

注入依赖

@Autowired
    private EasyIdClient easyIdClient;
    @Autowired
    private AccountClient accountClient;
    @Autowired
    private StorageClient storageClient;

测试：http://localhost:8083/create?userId=1&productId=1&count=10&money=100

调整

order-parent的pom.xml

<modules>
        <module>account</module>
        <module>storage</module>
        <module>order</module>
    </modules>

order的application.yml禁用重试

ribbon:
  MaxAutoRetriesNextServer: 0

Seata–AT模型

概念

  • Seata 的 AT 模式（Automatic Transaction）是一种无侵入的分布式事务解决方案。
  • 订单系统开始执行保存订单之前，首先启动 TM（Transaction Manager，事务管理器），由 TM 向 TC 申请开启一个全局事务，这时TC会产生一个全局事务ID，称为 XID，并将 XID 传回 TM
  • TC（Transaction Coordinator），事务协调器，协调各个模块执行，各个模块执行结束后需要向TC协调器上报状态，再由TC通知各个模块整体事务成功/失败，一个模块失败，TC通知执行回滚操作
  • 原理+机制： https://wanght.blog.csdn.net/article/details/107583229

步骤：

1.启动TC事务协调器：Seata Server

解压缩

2.修改三个配置文件

  • registry.conf
    向eureka注册

  • file.conf
    seata-server运行过程中产生的日志数据存储到什么位置

全局事务、分支事务、全局锁

  • seata.server.bat
    修改虚拟机使用的内存大小

3.运行seata.server.bat

  • 前提：
    JAVA_HOME、PATH
    JDK1.8
    命令行窗口不可关闭，内容不可以选中

4.添加Seata AT事务

1.添加seata依赖

<dependency>
          <groupId>com.alibaba.cloud</groupId>
          <artifactId>spring-cloud-alibaba-seata</artifactId>
          <version>${spring-cloud-alibaba-seata.version}</version>
          <exclusions>
            <exclusion>
              <artifactId>seata-all</artifactId>
              <groupId>io.seata</groupId>
            </exclusion>
          </exclusions>
        </dependency>
        <dependency>
          <groupId>io.seata</groupId>
          <artifactId>seata-all</artifactId>
          <version>${seata.version}</version>
        </dependency>

2.修改三个配置文件

application.yml
配置事务组的组名

registry.conf
设置注册中心的地址

registry {
  # file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
  type = "eureka"

  nacos {
    serverAddr = "localhost"
    namespace = ""
    cluster = "default"
  }
  eureka {
    serviceUrl = "http://localhost:8761/eureka"
    # application = "default"
    # weight = "1"
  }
  redis {
    serverAddr = "localhost:6379"
    db = "0"
    password = ""
    cluster = "default"
    timeout = "0"
  }
  zk {
    cluster = "default"
    serverAddr = "127.0.0.1:2181"
    session.timeout = 6000
    connect.timeout = 2000
    username = ""
    password = ""
  }
  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、springCloudConfig
  type = "file"

  nacos {
    serverAddr = "localhost"
    namespace = ""
    group = "SEATA_GROUP"
  }
  consul {
    serverAddr = "127.0.0.1:8500"
  }
  apollo {
    app.id = "seata-server"
    apollo.meta = "http://192.168.1.204:8801"
    namespace = "application"
  }
  zk {
    serverAddr = "127.0.0.1:2181"
    session.timeout = 6000
    connect.timeout = 2000
    username = ""
    password = ""
  }
  etcd3 {
    serverAddr = "http://localhost:2379"
  }
  file {
    name = "file.conf"
  }
}

file.conf
事务组对应使用的协调器

transport {
  # tcp udt unix-domain-socket
  type = "TCP"
  #NIO NATIVE
  server = "NIO"
  #enable heartbeat
  heartbeat = true
  # the client batch send request enable
  enableClientBatchSendRequest = true
  #thread factory for netty
  threadFactory {
    bossThreadPrefix = "NettyBoss"
    workerThreadPrefix = "NettyServerNIOWorker"
    serverExecutorThread-prefix = "NettyServerBizHandler"
    shareBossWorker = false
    clientSelectorThreadPrefix = "NettyClientSelector"
    clientSelectorThreadSize = 1
    clientWorkerThreadPrefix = "NettyClientWorkerThread"
    # netty boss thread size,will not be used for UDT
    bossThreadSize = 1
    #auto default pin or 8
    workerThreadSize = "default"
  }
  shutdown {
    # when destroy server, wait seconds
    wait = 3
  }
  serialization = "seata"
  compressor = "none"
}
service {
  #transaction service group mapping
  # order_tx_group 与 yml 中的 “tx-service-group: order_tx_group” 配置一致
  # “seata-server” 与 TC 服务器的注册名一致
  # 从eureka获取seata-server的地址，再向seata-server注册自己，设置group
  vgroupMapping.order_tx_group = "seata-server"
  #only support when registry.type=file, please don't set multiple addresses
  order_tx_group.grouplist = "127.0.0.1:8091"
  #degrade, current not support
  enableDegrade = false
  #disable seata
  disableGlobalTransaction = false
}

client {
  rm {
    asyncCommitBufferLimit = 10000
    lock {
      retryInterval = 10
      retryTimes = 30
      retryPolicyBranchRollbackOnConflict = true
    }
    reportRetryCount = 5
    tableMetaCheckEnable = false
    reportSuccessEnable = false
  }
  tm {
    commitRetryCount = 5
    rollbackRetryCount = 5
  }
  undo {
    dataValidation = true
    logSerialization = "jackson"
    logTable = "undo_log"
  }
  log {
    exceptionRate = 100
  }
}

3.新建自动配置类，创建数据源代理

@Primary标注首选对象

package cn.tedu.order;

import com.zaxxer.hikari.HikariDataSource;
import io.seata.rm.datasource.DataSourceProxy;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;

import javax.sql.DataSource;

@Configuration
public class DSAutoConf {
    //创建原始数据源
    @ConfigurationProperties(prefix = "spring.datasource")
    @Bean
    public DataSource getDataSource(){
        return new HikariDataSource();
    }
    //创建数据源代理
    @Primary //首选对象
    @Bean
    public DataSource getDataSourceProxy(DataSource ds){
        return new DataSourceProxy(ds);
    }
}

排除spring默认数据源配置

package cn.tedu.order;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.cloud.openfeign.EnableFeignClients;

@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)
@MapperScan("cn.tedu.order.mapper")
@EnableFeignClients
public class OrderApplication {

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

4.在业务方法上添加事务注解

@Transactional–控制本地事务
@GlobalTransactional–启动全局事务，只在第一个模块添加

版权说明 : 本文为转载文章, 版权归原作者所有 版权申明

原文链接 : https://blog.csdn.net/weixin_55740233/article/details/121530003

内容来源于网络，如有侵权，请联系作者删除！

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