Spring Cloud的分布式事务组件

今天我学习了Spring Cloud的分布式事务组件：Spring Cloud Alibaba Seata。Spring Cloud Alibaba Seata是一种分布式事务管理框架，能够实现分布式事务的ACID特性。下面是一个使用Spring Cloud Alibaba Seata的示例：

@SpringBootApplication

@EnableDiscoveryClient

@MapperScan("com.example.demo.dao")

@EnableAutoDataSourceProxy

@EnableFeignClients(basePackages = "com.example.demo.service.feign")

public class Application {

 

    public static void main(String[] args) {

        SpringApplication.run(Application.class, args);

    }

}

 

@RestController

class HelloController {

 

    @Autowired

    private HelloService helloService;

 

    @GetMapping("/hello")

    public String hello() {

        return helloService.hello();

    }

}

 

@Service

@FeignClient("demo-service-provider")

interface HelloService {

 

    @GetMapping("/hello")

    String hello();

}

 

@Service

public class HelloServiceImpl implements HelloService {

 

    @Autowired

    private HelloMapper helloMapper;

 

    @Override

    @GlobalTransactional

    public String hello() {

        helloMapper.insert(new Hello(1L, "Hello, world!"));

        return "Hello, world!";

    }

}

 

@Mapper

public interface HelloMapper {

 

    @Insert("insert into hello(id, message) values(#{id}, #{message})")

    int insert(Hello hello);

}

 

@Data

@AllArgsConstructor

@NoArgsConstructor

public class Hello {

 

    private Long id;

    private String message;

}

 

这个示例中，我们使用@EnableAutoDataSourceProxy注解将数据源代理给Seata，使用@EnableFeignClients注解创建一个FeignClient实例，使用@GlobalTransactional注解标记服务的入口方法，从而实现分布式事务的ACID特性。