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YunaiV
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增加 seata 服务
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‎lab-52/lab-52-multiple-datasource/src/main/java/cn/iocoder/springboot/lab52/seatademo/service/impl/OrderServiceImpl.java

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@@ -27,9 +27,9 @@ public class OrderServiceImpl implements OrderService {
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@Autowired
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private ProductService productService;
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@GlobalTransactional
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@Override
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@DS(value = "order-ds")
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@GlobalTransactional
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public Integer createOrder(Long userId, Long productId, Integer price) throws Exception {
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Integer amount = 1; // 购买数量，暂时设置为 1。
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‎lab-52/lab-52-seata-at-httpclient-demo/lab-52-seata-at-httpclient-demo-account-service/pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>2.2.2.RELEASE</version>
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<relativePath/> <!-- lookup parent from repository -->
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<artifactId>lab-52-seata-at-httpclient-demo-account-service</artifactId>
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<dependencies>
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<!-- 实现对 Spring MVC 的自动化配置 -->
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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<!-- 实现对数据库连接池的自动化配置 -->
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-jdbc</artifactId>
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</dependency>
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<dependency> <!-- 本示例，我们使用 MySQL -->
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<groupId>mysql</groupId>
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<artifactId>mysql-connector-java</artifactId>
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<version>5.1.48</version>
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</dependency>
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<!-- 实现对 MyBatis 的自动化配置 -->
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<dependency>
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<groupId>org.mybatis.spring.boot</groupId>
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<artifactId>mybatis-spring-boot-starter</artifactId>
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<version>2.1.2</version>
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</dependency>
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<!-- 实现对 Seata 的自动化配置 -->
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<dependency>
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<groupId>io.seata</groupId>
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<artifactId>seata-spring-boot-starter</artifactId>
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<version>1.1.0</version>
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</dependency>
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<!-- 实现 Seata 对 HttpClient 的集成支持 -->
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<dependency>
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<groupId>io.seata</groupId>
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<artifactId>seata-http</artifactId>
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<version>1.1.0</version>
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</dependency>
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<!-- Apache HttpClient 依赖 -->
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<dependency>
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<groupId>org.apache.httpcomponents</groupId>
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<artifactId>httpclient</artifactId>
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<version>4.5.8</version>
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</dependency>
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</dependencies>
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</project>

‎lab-52/lab-52-seata-at-httpclient-demo/lab-52-seata-at-httpclient-demo-account-service/src/main/java/cn/iocoder/springboot/lab52/accountservice/AccountServiceApplication.java

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package cn.iocoder.springboot.lab52.accountservice;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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@SpringBootApplication
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public class AccountServiceApplication {
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public static void main(String[] args) {
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SpringApplication.run(AccountServiceApplication.class, args);
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}
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}

‎lab-52/lab-52-seata-at-httpclient-demo/lab-52-seata-at-httpclient-demo-account-service/src/main/java/cn/iocoder/springboot/lab52/accountservice/controller/AccountController.java

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package cn.iocoder.springboot.lab52.accountservice.controller;
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import cn.iocoder.springboot.lab52.accountservice.dto.AccountReduceBalanceDTO;
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import cn.iocoder.springboot.lab52.accountservice.service.AccountService;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.web.bind.annotation.PostMapping;
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import org.springframework.web.bind.annotation.RequestBody;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RestController;
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@RestController
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@RequestMapping("/account")
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public class AccountController {
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private Logger logger = LoggerFactory.getLogger(AccountController.class);
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@Autowired
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private AccountService accountService;
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@PostMapping("/reduce-balance")
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public Boolean reduceBalance(@RequestBody AccountReduceBalanceDTO accountReduceBalanceDTO) {
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logger.info("[reduceBalance] 收到减少余额请求, 用户:{}, 金额:{}", accountReduceBalanceDTO.getUserId(),
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accountReduceBalanceDTO.getPrice());
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try {
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accountService.reduceBalance(accountReduceBalanceDTO.getUserId(), accountReduceBalanceDTO.getPrice());
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// 正常扣除余额，返回 true
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return true;
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} catch (Exception e) {
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// 失败扣除余额，返回 false
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return false;
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}
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}
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}

‎lab-52/lab-52-seata-at-httpclient-demo/lab-52-seata-at-httpclient-demo-account-service/src/main/java/cn/iocoder/springboot/lab52/accountservice/dao/AccountDao.java

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package cn.iocoder.springboot.lab52.accountservice.dao;
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import org.apache.ibatis.annotations.Mapper;
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import org.apache.ibatis.annotations.Param;
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import org.apache.ibatis.annotations.Select;
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import org.apache.ibatis.annotations.Update;
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import org.springframework.stereotype.Repository;
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@Mapper
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@Repository
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public interface AccountDao {
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/**
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* 获取账户余额
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*
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* @param userId 用户 ID
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* @return 账户余额
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*/
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@Select("SELECT balance FROM account WHERE id = #{userId}")
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Integer getBalance(@Param("userId") Long userId);
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/**
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* 扣减余额
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*
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* @param price 需要扣减的数目
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* @return 影响记录行数
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*/
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@Update("UPDATE account SET balance = balance - #{price} WHERE id = 1 AND balance >= ${price}")
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int reduceBalance(@Param("price") Integer price);
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}

‎lab-52/lab-52-seata-at-httpclient-demo/lab-52-seata-at-httpclient-demo-account-service/src/main/java/cn/iocoder/springboot/lab52/accountservice/dto/AccountReduceBalanceDTO.java

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package cn.iocoder.springboot.lab52.accountservice.dto;
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/**
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* 账户减少余额 DTO
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*/
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public class AccountReduceBalanceDTO {
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/**
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* 用户编号
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*/
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private Long userId;
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/**
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* 扣减金额
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*/
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private Integer price;
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public Long getUserId() {
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return userId;
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}
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public AccountReduceBalanceDTO setUserId(Long userId) {
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this.userId = userId;
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return this;
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}
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public Integer getPrice() {
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return price;
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}
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public AccountReduceBalanceDTO setPrice(Integer price) {
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this.price = price;
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return this;
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}
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}

‎lab-52/lab-52-seata-at-httpclient-demo/lab-52-seata-at-httpclient-demo-account-service/src/main/java/cn/iocoder/springboot/lab52/accountservice/service/AccountService.java

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package cn.iocoder.springboot.lab52.accountservice.service;
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/**
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* 账户 Service
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*/
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public interface AccountService {
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/**
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* 扣除余额
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*
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* @param userId 用户编号
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* @param price 扣减金额
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* @throws Exception 失败时抛出异常
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*/
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void reduceBalance(Long userId, Integer price) throws Exception;
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}

‎lab-52/lab-52-seata-at-httpclient-demo/lab-52-seata-at-httpclient-demo-account-service/src/main/java/cn/iocoder/springboot/lab52/accountservice/service/AccountServiceImpl.java

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package cn.iocoder.springboot.lab52.accountservice.service;
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import cn.iocoder.springboot.lab52.accountservice.dao.AccountDao;
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import io.seata.core.context.RootContext;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.stereotype.Service;
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import org.springframework.transaction.annotation.Transactional;
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@Service
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public class AccountServiceImpl implements AccountService {
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private Logger logger = LoggerFactory.getLogger(getClass());
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@Autowired
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private AccountDao accountDao;
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@Override
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@Transactional // 开启新事物
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public void reduceBalance(Long userId, Integer price) throws Exception {
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logger.info("[reduceBalance] 当前 XID: {}", RootContext.getXID());
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// 检查余额
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checkBalance(userId, price);
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logger.info("[reduceBalance] 开始扣减用户 {} 余额", userId);
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// 扣除余额
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int updateCount = accountDao.reduceBalance(price);
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// 扣除成功
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if (updateCount == 0) {
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logger.warn("[reduceBalance] 扣除用户 {} 余额失败", userId);
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throw new Exception("余额不足");
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}
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logger.info("[reduceBalance] 扣除用户 {} 余额成功", userId);
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}
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private void checkBalance(Long userId, Integer price) throws Exception {
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logger.info("[checkBalance] 检查用户 {} 余额", userId);
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Integer balance = accountDao.getBalance(userId);
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if (balance < price) {
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logger.warn("[checkBalance] 用户 {} 余额不足，当前余额:{}", userId, balance);
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throw new Exception("余额不足");
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}
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}
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}

‎lab-52/lab-52-seata-at-httpclient-demo/lab-52-seata-at-httpclient-demo-account-service/src/main/resources/application.yaml

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server:
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port: 8083
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spring:
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application:
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name: account-service
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datasource:
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url: jdbc:mysql://127.0.0.1:3306/seata_account?useSSL=false&useUnicode=true&characterEncoding=UTF-8
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driver-class-name: com.mysql.jdbc.Driver
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username: root
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password:
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# Seata 配置项，对应 SeataProperties 类
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seata:
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application-id: ${spring.application.name} # Seata 应用编号，默认为 ${spring.application.name}
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tx-service-group: ${spring.application.name}-group # Seata 事务组编号，用于 TC 集群名
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# 服务配置项，对应 ServiceProperties 类
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service:
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# 虚拟组和分组的映射
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vgroup-mapping:
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account-service-group: default
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# 分组和 Seata 服务的映射
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grouplist:
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default: 127.0.0.1:8091

‎lab-52/lab-52-seata-at-httpclient-demo/lab-52-seata-at-httpclient-demo-order-service/pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>2.2.2.RELEASE</version>
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<relativePath/> <!-- lookup parent from repository -->
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<artifactId>lab-52-seata-at-httpclient-demo-order-service</artifactId>
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<dependencies>
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<!-- 实现对 Spring MVC 的自动化配置 -->
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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<!-- 实现对数据库连接池的自动化配置 -->
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-jdbc</artifactId>
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</dependency>
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<dependency> <!-- 本示例，我们使用 MySQL -->
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<groupId>mysql</groupId>
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<artifactId>mysql-connector-java</artifactId>
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<version>5.1.48</version>
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</dependency>
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<!-- 实现对 MyBatis 的自动化配置 -->
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<dependency>
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<groupId>org.mybatis.spring.boot</groupId>
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<artifactId>mybatis-spring-boot-starter</artifactId>
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<version>2.1.2</version>
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</dependency>
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<!-- 实现对 Seata 的自动化配置 -->
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<dependency>
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<groupId>io.seata</groupId>
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<artifactId>seata-spring-boot-starter</artifactId>
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<version>1.1.0</version>
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</dependency>
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<!-- 实现 Seata 对 HttpClient 的集成支持 -->
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<dependency>
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<groupId>io.seata</groupId>
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<artifactId>seata-http</artifactId>
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<version>1.1.0</version>
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</dependency>
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<!-- Apache HttpClient 依赖 -->
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<dependency>
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<groupId>org.apache.httpcomponents</groupId>
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<artifactId>httpclient</artifactId>
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<version>4.5.8</version>
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</dependency>
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</dependencies>
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</project>

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