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增加 spring boot x seata

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YunaiV
2020-04-01 19:25:13 +08:00
parent 48522b14e6
commit 644ef85f4b
16 changed files with 517 additions and 0 deletions
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55
lab-52/lab-52-multiple-datasource/pom.xml Normal file
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<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.2.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>lab-52-multiple-datasource</artifactId>
<dependencies>
<!-- TODO web -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- 实现对数据库连接池的自动化配置 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency> <!-- 本示例，我们使用 MySQL -->
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.48</version>
</dependency>
<!-- TODO mybatis -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.2</version>
</dependency>
<!-- 实现对 dynamic-datasource 的自动化配置 -->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>dynamic-datasource-spring-boot-starter</artifactId>
<version>3.0.0</version>
</dependency>
<!-- TODO 分布式事务 -->
<dependency>
<groupId>io.seata</groupId>
<artifactId>seata-spring-boot-starter</artifactId>
<version>1.1.0</version>
</dependency>
</dependencies>
</project>

13
lab-52/lab-52-multiple-datasource/src/main/java/cn/iocoder/springboot/lab52/seatademo/MultipleDatasourceApplication.java Normal file
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package cn.iocoder.springboot.lab52.seatademo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class MultipleDatasourceApplication {
public static void main(String[] args) {
SpringApplication.run(MultipleDatasourceApplication.class, args);
}
}

29
lab-52/lab-52-multiple-datasource/src/main/java/cn/iocoder/springboot/lab52/seatademo/controller/OrderController.java Normal file
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package cn.iocoder.springboot.lab52.seatademo.controller;
import cn.iocoder.springboot.lab52.seatademo.service.OrderService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/order")
public class OrderController {
private Logger logger = LoggerFactory.getLogger(OrderController.class);
@Autowired
private OrderService orderService;
@PostMapping("/create")
public Integer createOrder(@RequestParam("userId") Long userId,
@RequestParam("productId") Long productId,
@RequestParam("price") Integer price) throws Exception {
logger.info("收到下单请求,用户:{}, 商品:{}, 价格:{}", userId, productId, price);
return orderService.createOrder(userId, productId, price);
}
}

32
lab-52/lab-52-multiple-datasource/src/main/java/cn/iocoder/springboot/lab52/seatademo/dao/AccountDao.java Normal file
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package cn.iocoder.springboot.lab52.seatademo.dao;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;
import org.springframework.stereotype.Repository;
@Mapper
@Repository
public interface AccountDao {
/**
* 获取账户余额
*
* @param userId 用户 ID
* @return 账户余额
*/
@Select("SELECT balance FROM account WHERE id = #{userId}")
Integer getBalance(@Param("userId") Long userId);
/**
* 扣减余额
*
* @param price 需要扣减的数目
* @return 影响记录行数
*/
@Update("UPDATE account SET balance = balance - #{price} WHERE id = 1 AND balance >= ${price}")
int reduceBalance(@Param("price") Integer price);
}

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lab-52/lab-52-multiple-datasource/src/main/java/cn/iocoder/springboot/lab52/seatademo/dao/OrderDao.java Normal file
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package cn.iocoder.springboot.lab52.seatademo.dao;
import cn.iocoder.springboot.lab52.seatademo.entity.OrderDO;
import org.apache.ibatis.annotations.*;
import org.springframework.stereotype.Repository;
@Mapper
@Repository
public interface OrderDao {
/**
* 插入订单记录
*
* @param order 订单
* @return 影响记录数量
*/
@Insert("INSERT INTO orders (user_id, product_id, pay_amount) VALUES (#{userId}, #{productId}, #{payAmount})")
@Options(useGeneratedKeys = true, keyColumn = "id", keyProperty = "id")
int saveOrder(OrderDO order);
}

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lab-52/lab-52-multiple-datasource/src/main/java/cn/iocoder/springboot/lab52/seatademo/dao/ProductDao.java Normal file
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package cn.iocoder.springboot.lab52.seatademo.dao;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;
import org.springframework.stereotype.Repository;
@Mapper
@Repository
public interface ProductDao {
/**
* 获取库存
*
* @param productId 商品编号
* @return 库存
*/
@Select("SELECT stock FROM product WHERE id = #{productId}")
Integer getStock(@Param("productId") Long productId);
/**
* 扣减库存
*
* @param productId 商品编号
* @param amount 扣减数量
* @return 影响记录行数
*/
@Update("UPDATE product SET stock = stock - #{amount} WHERE id = #{productId} AND stock >= #{amount}")
int reduceStock(@Param("productId") Long productId, @Param("amount") Integer amount);
}

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lab-52/lab-52-multiple-datasource/src/main/java/cn/iocoder/springboot/lab52/seatademo/entity/OrderDO.java Normal file
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package cn.iocoder.springboot.lab52.seatademo.entity;
/**
* 订单实体
*/
public class OrderDO {
/** 订单编号 **/
private Integer id;
/** 用户编号 **/
private Long userId;
/** 产品编号 **/
private Long productId;
/** 支付金额 **/
private Integer payAmount;
public Integer getId() {
return id;
}
public OrderDO setId(Integer id) {
this.id = id;
return this;
}
public Long getUserId() {
return userId;
}
public OrderDO setUserId(Long userId) {
this.userId = userId;
return this;
}
public Long getProductId() {
return productId;
}
public OrderDO setProductId(Long productId) {
this.productId = productId;
return this;
}
public Integer getPayAmount() {
return payAmount;
}
public OrderDO setPayAmount(Integer payAmount) {
this.payAmount = payAmount;
return this;
}
}

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lab-52/lab-52-multiple-datasource/src/main/java/cn/iocoder/springboot/lab52/seatademo/service/OrderService.java Normal file
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package cn.iocoder.springboot.lab52.seatademo.service;
/**
* 订单 Service
*/
public interface OrderService {
/**
* 创建订单
*
* @param userId 用户编号
* @param productId 产品编号
* @param price 价格
* @return 订单编号
* @throws Exception 创建订单失败，抛出异常
*/
Integer createOrder(Long userId, Long productId, Integer price) throws Exception;
}

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lab-52/lab-52-multiple-datasource/src/main/java/cn/iocoder/springboot/lab52/seatademo/service/PayService.java Normal file
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package cn.iocoder.springboot.lab52.seatademo.service;
/**
* 支付 Service
*/
public interface PayService {
/**
* 扣除余额
*
* @param userId 用户编号
* @param price 扣减金额
* @throws Exception 失败时抛出异常
*/
void reduceBalance(Long userId, Integer price) throws Exception;
}

17
lab-52/lab-52-multiple-datasource/src/main/java/cn/iocoder/springboot/lab52/seatademo/service/StorageService.java Normal file
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package cn.iocoder.springboot.lab52.seatademo.service;
/**
* 库存 Service
*/
public interface StorageService {
/**
* 扣减库存
*
* @param productId 商品 ID
* @param amount 扣减数量
* @throws Exception 扣减失败时抛出异常
*/
void reduceStock(Long productId, Integer amount) throws Exception;
}

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lab-52/lab-52-multiple-datasource/src/main/java/cn/iocoder/springboot/lab52/seatademo/service/impl/OrderServiceImpl.java Normal file
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package cn.iocoder.springboot.lab52.seatademo.service.impl;
import cn.iocoder.springboot.lab52.seatademo.dao.OrderDao;
import cn.iocoder.springboot.lab52.seatademo.entity.OrderDO;
import cn.iocoder.springboot.lab52.seatademo.service.OrderService;
import cn.iocoder.springboot.lab52.seatademo.service.PayService;
import cn.iocoder.springboot.lab52.seatademo.service.StorageService;
import com.baomidou.dynamic.datasource.annotation.DS;
import io.seata.core.context.RootContext;
import io.seata.spring.annotation.GlobalTransactional;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class OrderServiceImpl implements OrderService {
private Logger logger = LoggerFactory.getLogger(getClass());
@Autowired
private OrderDao orderDao;
@Autowired
private PayService payService;
@Autowired
private StorageService storageService;
@GlobalTransactional
@Override
@DS(value = "order-ds")
public Integer createOrder(Long userId, Long productId, Integer price) throws Exception {
Integer amount = 1; // 购买数量，暂时设置为 1。
logger.info("[createOrder] 当前 XID: {}", RootContext.getXID());
// 扣减库存
storageService.reduceStock(productId, amount);
// 扣减余额
payService.reduceBalance(userId, price);
// 保存订单
OrderDO order = new OrderDO().setUserId(userId).setProductId(productId).setPayAmount(amount * price);
orderDao.saveOrder(order);
logger.info("[createOrder] 保存订单: {}", order.getId());
// 返回订单编号
return order.getId();
}
}

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lab-52/lab-52-multiple-datasource/src/main/java/cn/iocoder/springboot/lab52/seatademo/service/impl/PayServiceImpl.java Normal file
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package cn.iocoder.springboot.lab52.seatademo.service.impl;
import cn.iocoder.springboot.lab52.seatademo.dao.AccountDao;
import cn.iocoder.springboot.lab52.seatademo.service.PayService;
import com.baomidou.dynamic.datasource.annotation.DS;
import io.seata.core.context.RootContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
@Service
public class PayServiceImpl implements PayService {
private Logger logger = LoggerFactory.getLogger(getClass());
@Autowired
private AccountDao accountDao;
@Override
@DS(value = "pay-ds")
@Transactional(propagation = Propagation.REQUIRES_NEW) // 开启新事物
public void reduceBalance(Long userId, Integer price) throws Exception {
logger.info("[reduceBalance] 当前 XID: {}", RootContext.getXID());
// 检查余额
checkBalance(userId, price);
logger.info("[reduceBalance] 开始扣减用户 {} 余额", userId);
// 扣除余额
int updateCount = accountDao.reduceBalance(price);
// 扣除成功
if (updateCount == 0) {
logger.warn("[reduceBalance] 扣除用户 {} 余额失败", userId);
throw new Exception("余额不足");
}
logger.info("[reduceBalance] 扣除用户 {} 余额成功", userId);
}
private void checkBalance(Long userId, Integer price) throws Exception {
logger.info("[checkBalance] 检查用户 {} 余额", userId);
Integer balance = accountDao.getBalance(userId);
if (balance < price) {
logger.warn("[checkBalance] 用户 {} 余额不足，当前余额:{}", userId, balance);
throw new Exception("余额不足");
}
}
}

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lab-52/lab-52-multiple-datasource/src/main/java/cn/iocoder/springboot/lab52/seatademo/service/impl/StorageServiceImpl.java Normal file
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package cn.iocoder.springboot.lab52.seatademo.service.impl;
import cn.iocoder.springboot.lab52.seatademo.dao.ProductDao;
import cn.iocoder.springboot.lab52.seatademo.service.StorageService;
import com.baomidou.dynamic.datasource.annotation.DS;
import io.seata.core.context.RootContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
@Service
public class StorageServiceImpl implements StorageService {
private Logger logger = LoggerFactory.getLogger(getClass());
@Autowired
private ProductDao productDao;
@Override
@DS(value = "storage-ds")
@Transactional(propagation = Propagation.REQUIRES_NEW) // 开启新事物
public void reduceStock(Long productId, Integer amount) throws Exception {
logger.info("[reduceStock] 当前 XID: {}", RootContext.getXID());
// 检查库存
checkStock(productId, amount);
logger.info("[reduceStock] 开始扣减 {} 库存", productId);
// 扣减库存
int updateCount = productDao.reduceStock(productId, amount);
// 扣除成功
if (updateCount == 0) {
logger.warn("[reduceStock] 扣除 {} 库存成功", productId);
throw new Exception("库存不足");
}
// 扣除失败
logger.info("[reduceStock] 扣除 {} 库存失败", productId);
}
private void checkStock(Long productId, Integer requiredAmount) throws Exception {
logger.info("[checkStock] 检查 {} 库存", productId);
Integer stock = productDao.getStock(productId);
if (stock < requiredAmount) {
logger.warn("[checkStock] {} 库存不足，当前库存: {}", productId, stock);
throw new Exception("库存不足");
}
}
}

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lab-52/lab-52-multiple-datasource/src/main/resources/application.yaml Normal file
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server:
port: 8081 # 端口
spring:
application:
name: multi-datasource-service # 应用名
# cloud:
# alibaba:
# # Seata 配置项，对应 SpringCloudAlibabaConfiguration 类
# seata:
# tx-service-group: my_test_tx_group
datasource:
# dynamic-datasource-spring-boot-starter 动态数据源的配配项，对应 DynamicDataSourceProperties 类
dynamic:
primary: order-ds # 设置默认的数据源或者数据源组，默认值即为 master
datasource:
# 订单 order 数据源配置
order-ds:
url: jdbc:mysql://127.0.0.1:3306/seata_order?useSSL=false&useUnicode=true&characterEncoding=UTF-8
driver-class-name: com.mysql.jdbc.Driver
username: root
password:
# 支付 pay 数据源配置
pay-ds:
url: jdbc:mysql://127.0.0.1:3306/seata_pay?useSSL=false&useUnicode=true&characterEncoding=UTF-8
driver-class-name: com.mysql.jdbc.Driver
username: root
password:
# 库存 storage 数据源配置
storage-ds:
url: jdbc:mysql://127.0.0.1:3306/seata_storage?useSSL=false&useUnicode=true&characterEncoding=UTF-8
driver-class-name: com.mysql.jdbc.Driver
username: root
password:
# Seata 配置项，对应 SeataProperties 类
seata:
application-id: ${spring.application.name} # Seata 应用编号，默认为 ${spring.application.name}
tx-service-group: ${spring.application.name}-group # Seata 事务组编号，用于 TC 集群名
# 服务配置项，对应 ServiceProperties 类
service:
# 虚拟组和分组的映射
vgroup-mapping:
multi-datasource-service-group: default
# 分组和 Seata 服务的映射
grouplist:
default: 127.0.0.1:8091

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lab-52/pom.xml Normal file
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<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>labs-parent</artifactId>
<groupId>cn.iocoder.springboot.labs</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>lab-52</artifactId>
<packaging>pom</packaging>
<modules>
<module>lab-52-multiple-datasource</module>
</modules>
</project>

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pom.xml
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<module>lab-51</module>
<module>labx-15</module>
<module>labx-16</module>
<module>lab-52</module>
<!-- Dubbo 示例 -->
</modules>