Seata 分佈式事務系列二: Dubbo分佈式事務
在前面一篇咱們介紹了Seata 分佈式事務系列一: Seata 服務端搭建.html
這一篇咱們使用Seata 進行一個 Dubbo 微服務分佈式事務的示例. 本示例包含 4 個項目:java
- API Rest服務, 統一對外的業務模塊, 這裏示例一個購物服務 purchase(). 其 Dubbo 身份爲服務消費者.
- Account 帳戶微服務, 下單前需扣除帳戶餘額. 其 Dubbo 身份爲服務提供者.
- Order 訂單微服務, 建立訂單. 其 Dubbo 身份爲服務消費者 + 提供者.
- Inventory 庫存微服務, 建立訂單前需扣除商品庫存. 其 Dubbo 身份爲服務提供者.
四者之間的調用關係以下圖所示:
mysql
一. API 服務
API 模塊爲一個普通的 SpringBoot Web Restful API服務, 爲 Dubbo 服務消費者. 在 purchase() 中, 啓動全局事務.web
1.1 maven依賴
<?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">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.5.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>fun.faceless.dubboshop.api</groupId>
<artifactId>parent</artifactId>
<packaging>pom</packaging>
<version>1.0.0-SNAPSHOT</version>
<name>api-center</name>
<description>dubboshop api center</description>
<properties>
<java.version>1.8</java.version>
<spring-boot.version>2.1.5.RELEASE</spring-boot.version>
<spring.version>5.1.7.RELEASE</spring.version>
<dubbo.version>2.7.7</dubbo.version>
</properties>
<dependencyManagement>
<dependencies>
<!-- springboot related -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>${spring-boot.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<version>${spring-boot.version}</version>
<scope>runtime</scope>
</dependency>
<!-- db data -->
<!-- 對應 mybatis 3.5.5，從3.5.0開始支持mapper返回Optional -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.3</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.mybatis.dynamic-sql/mybatis-dynamic-sql -->
<dependency>
<groupId>org.mybatis.dynamic-sql</groupId>
<artifactId>mybatis-dynamic-sql</artifactId>
<version>1.1.4</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.16</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.0.29</version>
</dependency>
<!-- Redis -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
<version>${spring-boot.version}</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-pool2</artifactId>
<version>2.6.2</version>
</dependency>
<!--jackson依賴-->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.9.5</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.5</version>
</dependency>
<!-- rocketmq -->
<!--<dependency>
<groupId>org.apache.rocketmq</groupId>
<artifactId>rocketmq-client</artifactId>
<version>4.7.0</version>
</dependency>-->
<dependency>
<groupId>org.apache.rocketmq</groupId>
<artifactId>rocketmq-spring-boot-starter</artifactId>
<version>2.1.0</version>
</dependency>
<!-- caching -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-cache</artifactId>
<version>${spring-boot.version}</version>
</dependency>
<dependency>
<groupId>org.ehcache</groupId>
<version>3.6.3</version>
<artifactId>ehcache</artifactId>
</dependency>
<dependency>
<groupId>javax.cache</groupId>
<artifactId>cache-api</artifactId>
<version>1.1.0</version>
</dependency>
<!-- Seata -->
<dependency>
<groupId>io.seata</groupId>
<artifactId>seata-spring-boot-starter</artifactId>
<version>1.3.0</version>
</dependency>
<!-- Dubbo dependencies -->
<dependency>
<groupId>org.apache.dubbo</groupId>
<artifactId>dubbo-bom</artifactId>
<version>${dubbo.version}</version>
<type>pom</type>
</dependency>
<dependency>
<groupId>org.apache.dubbo</groupId>
<artifactId>dubbo</artifactId>
<version>${dubbo.version}</version>
<exclusions>
<exclusion>
<groupId>org.apache.thrift</groupId>
<artifactId>libthrift</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.dubbo</groupId>
<artifactId>dubbo-spring-boot-starter</artifactId>
<version>${dubbo.version}</version>
</dependency>
<dependency>
<groupId>org.apache.dubbo</groupId>
<artifactId>dubbo-metadata-report-zookeeper</artifactId>
<version>${dubbo.version}</version>
</dependency>
<!-- dubbo REST protocal -->
<dependency>
<groupId>org.apache.dubbo</groupId>
<artifactId>dubbo-rpc-rest</artifactId>
<version>${dubbo.version}</version>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-core</artifactId>
<version>8.5.32</version>
</dependency>
<!-- Zookeeper dependencies-->
<dependency>
<groupId>org.apache.dubbo</groupId>
<artifactId>dubbo-dependencies-zookeeper</artifactId>
<version>2.7.1</version>
<type>pom</type>
<exclusions>
<exclusion>
<artifactId>log4j</artifactId>
<groupId>log4j</groupId>
</exclusion>
<exclusion>
<artifactId>slf4j-log4j12</artifactId>
<groupId>org.slf4j</groupId>
</exclusion>
</exclusions>
</dependency>
<!-- inter-project modules -->
<dependency>
<groupId>fun.faceless.dubboshop</groupId>
<artifactId>comms</artifactId>
<version>1.0.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>fun.faceless.dubboshop.inventory</groupId>
<artifactId>dubboapi</artifactId>
<version>1.0.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>fun.faceless.dubboshop.account</groupId>
<artifactId>dubboapi</artifactId>
<version>1.0.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>fun.faceless.dubboshop.order</groupId>
<artifactId>dubboapi</artifactId>
<version>1.0.0-SNAPSHOT</version>
</dependency>
<!-- other dependencies -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.8</version>
<optional>true</optional>
</dependency>
<!-- testing related -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<version>${spring-boot.version}</version>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<!-- 將上面經過 dependencyManagement 指定版本號的依賴根據須要放到這裏... -->
</dependencies>
1.2 項目配置文件
在 application.yaml中配置 seata:redis
spring:
# 這裏省略spring相關的常規配置...
dubbo:
# 註冊中心配置
registry:
id: dubboshop-registry
address: zookeeper://<your_zk_host>:2181
group: dubbo
simplified: true
metadata-report:
address: zookeeper://<your_zk_host>:2181
group: dubbo
application:
name: dubboshop-api
id: dubboshop-api
logger: slf4j
# 這裏 seata 未使用註冊中心. 若是使用過
seata:
application-id: dubboshop-api # Seata 應用編號，
tx-service-group: dubboshop-api-group # Seata 事務組編號，用於 TC 集羣名
# Seata 服務配置項，對應 ServiceProperties 類
service:
# 虛擬組和分組的映射
vgroup-mapping:
dubboshop-api-group: default # 這裏 dubboshop-api-group 對應上面 tx-service-group 的值.
# 分組和 Seata 服務的映射. 不適用 Nacos 註冊中心時, 配置grouplist, 不然不須要該項.
grouplist:
default: <your_seata_server_host>:8091
1.3 業務代碼
項目啓動WebApplication:spring
@SpringBootApplication
@RestController
@ComponentScan("fun.faceless.dubboshop.api")
public class WebApplication {
public static void main(String[] args) {
SpringApplication.run(WebApplication.class, args);
}
@GetMapping("/")
public String home() {
return String.format("<html>Welcome to %s</html>", "DubboShopApiCenter");
}
}
業務代碼, 這裏爲了方便, 事務直接放在了OrderController中, 沒有單獨去寫一個Service了.sql
@RestController
@RequestMapping("/api")
@Slf4j
public class OrderController {
// 在 dubbo 2.7.x 中, cluster="failfast" 存在bug, 沒法正常生效, 因此須要設置 retries=0.
@Reference(protocol = "dubbo", cluster="failfast", retries=0)
OrderProvider orderProvider;
@Reference(protocol = "dubbo", cluster="failfast", retries=0)
AccountCreditProvider accountCreditProvider;
private String dubboConfigCenterAddr = "yyadmin:2181";
@PostMapping(value = "purchase")
@GlobalTransactional // 注意這裏啓動全局事務
public Result purchase(@RequestParam int userId, @RequestParam int goodsId, @RequestParam int goodsNum) {
log.info("當前 XID: {}", RootContext.getXID());
int unitCredit = 10;
int creditAmount = goodsNum * unitCredit;
accountCreditProvider.debit(userId, creditAmount);
orderProvider.createOrder(userId, goodsId, goodsNum);
return Result.succ("Order created successfully.");
}
}
二. 其餘微服務
其餘微服務指 Account, Inventory, Order 3 個微服務項目. 三者的配置和方式都基本同樣, 核心就是在相關 Service 上使用 @Transactional 進行本地事務管理. 此外, 能夠經過 RootContext獲取全局事務ID: xid.數據庫
2.1 Maven依賴
微服務項目的 dubbo 和 seata 有關依賴跟 api項目的依賴基本一致. 能夠直接參考上面.apache
2.2 項目配置
各微服務項目 dubbo 和 seata 有關的配置也基本一致. 只不過這三者做爲微服務提供者, dubbo 相關的會多一些 protocol 配置. 這裏以 Order 項目爲例:segmentfault
# ========= Dubbo Provider ==============
dubbo:
# 配置中心, see: http://dubbo.apache.org/zh-cn/docs/user/configuration/config-center.html
config-center:
address: zookeeper://<your_zk_host>:2181
group: dubbo
# 註冊中心配置
registry:
id: dubboshop-registry
address: zookeeper://<your_zk_host>:2181
group: dubbo
simplified: true
check: true
metadata-report:
address: zookeeper://<your_zk_host>:2181
group: dubbo
application:
name: dubboshop-order
id: dubboshop-order
logger: slf4j
# 示例多 Protocol, 這裏支持 dubbo 和 rest 兩種 Protocols.
protocols:
dubbo:
name: dubbo
server: netty4
port: 20884
accesslog: true
rest:
name: rest
server: tomcat
port: 8084
accesslog: true
scan:
# dubbo 服務提供者實現類所在包
base-packages: fun.faceless.dubboshop.order.dubboprovider
# Seata 配置項，對應 SeataProperties 類
seata:
application-id: dubboshop-order # Seata 應用編號，默認爲 ${spring.application.name}
tx-service-group: dubboshop-order-group # Seata 事務組編號，用於 TC 集羣名
# Seata 服務配置項，對應 ServiceProperties 類
service:
# 虛擬組和分組的映射
vgroup-mapping:
dubboshop-order-group: default # 這裏 dubboshop-order-group 對應 上面 tx-service-group 的值.
# 分組和 Seata 服務的映射. 不適用 Nacos 註冊中心時, 配置grouplist, 不然不須要該項.
grouplist:
default: <your_seata_server_host>:8091
# 本來純dubbo服務不須要配置 server.port, 不過 Seata 會自動啓動 SpringBoot Web, 須要配置一個端口. 注意若是是同一主機上啓動這幾個服務, 這個端口取不一樣的值. 不然會報端口占用異常.
server:
port: 28084
2.3 業務代碼
@Slf4j
@Service(cluster="failfast", retries=0, timeout = 2000)
public class OrderProviderImpl implements OrderProvider {
// 本地持久化 DAO
@Autowired
private OrderDao orderDao;
// Dubbo調用 InventoryProvider
@Reference(protocol="dubbo", cluster="failfast", retries=0, timeout = 1500)
private InventoryProvider inventoryProvider;
/**
* 調用Dubbo服務, 扣除庫存. 而後提交數據庫, 建立一個新訂單.
*
* @param userId
* @param goodsId
* @param orderCount
* @return 返回受影響的記錄行數
*/
@Override
@Transactional // <- 注意這裏須要本地事務
public int createOrder(int userId, int goodsId, int orderCount) {
log.info("當前 XID: {}", RootContext.getXID());
Result debitResult = inventoryProvider.deduce(goodsId, orderCount);
return this.saveOrder(userId, goodsId, orderCount);
}
private int saveOrder(int userId, int goodsId, int orderCount) {
Order order = new Order();
order.setUserId(userId);
order.setState((short) 10);
order.setGoodsInfo(prepareNewGoodsInfo(goodsId, orderCount));
int recordsAffected = orderDao.createOrder(order);
return recordsAffected;
}
// 省略其餘業務代碼
}
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