java - 在使用 Spring Data MongoDB 的事务中调用两个不同 ReactiveMongoRepository 中的方法？

Question

当使用 Spring Data MongoDB 的响应式(Reactive)编程模型时，可以执行如下事务:

Mono<DeleteResult> result = template.inTransaction()                                      
    .execute(action -> action.remove(query(where("id").is("step-1")), Step.class)); 

但是 Spring Data MongoDB 也支持“响应式(Reactive)存储库”，例如:

public interface PersonRepository extends ReactiveMongoRepository<Person, String>

  Flux<Person> findByLocationNear(Point location, Distance distance);
}

和

public interface CarRepository extends ReactiveMongoRepository<Car, String>

  Flux<Car> findByYear(int year);
}

我的问题是，鉴于您有 ReactiveMongoRepository的，你能以某种方式利用 MongoDB 事务吗？插入两个 Person和 Car在同一事务中(使用 PersonRepository 和 CarRepository 在这种情况下)？如果是这样，你如何做到这一点？

Answer 1

我也一直在努力寻找 的解决方案交易 支持响应式 Mongo DB 和 Spring Boot
但幸运的是我自己想通了。虽然谷歌的一些东西也有帮助，但那些都是非 react 性的。
重要提示 - 对于 Spring Boot 2.2.x，它运行良好，但对于 Spring Boot 2.3.x，它还有一些其他问题，它有内部重写和更改一起

您需要使用 ReactiveMongoTransactionManager 连同 ReactiveMongoDatabaseFactory ，最后的大部分细节，也共享相同的代码仓库

为了让 mongo 数据库支持事务，我们需要确保数据库应该在副本模式下运行 .
为什么我们需要那个？因为否则你会得到一些这样的错误:-
此客户端连接到的 MongoDB 集群不支持 session

相同的说明如下: -

使用 docker-compose.yml 运行基于 docker-compose 的 mongo db 服务器，如下共享:-

version: "3"
services:
    mongo:
        hostname: mongo
        container_name: localmongo_docker
        image: mongo
        expose:
          - 27017
        ports:
          - 27017:27017
        restart: always
        entrypoint: [ "/usr/bin/mongod", "--bind_ip_all", "--replSet", "rs0" ]
        volumes:
          - ./mongodata:/data/db # need to create a docker volume named as mongodata first

镜像出来后，执行命令(这里 localmongo_docker 是容器的名字):-

docker exec -it localmongo_docker mongo

复制并粘贴下面的命令并执行

rs.initiate(
   {
     _id : 'rs0',
     members: [
       { _id : 0, host : "mongo:27017" }
     ]
   }
 )

然后输入 退出执行退出

重要 - 代码库可以在我的 github 上找到 - https://github.com/krnbr/mongo-spring-boot-template
代码的重要说明如下:-

Mongo配置 中的类配置包是使交易工作的重要部分，配置类的链接是here

主要部分是 bean

 @Bean
 ReactiveMongoTransactionManager transactionManager(ReactiveMongoDatabaseFactory dbFactory) {
     return new ReactiveMongoTransactionManager(dbFactory);
 }

要检查代码的事务要求的工作，您可以通过服务包中的类 UserService here

如果链接对某人不起作用，则共享代码:-
配置和 Beans 内部

@Configuration
public class MongoConfiguration extends AbstractMongoClientConfiguration {

    @Autowired
    private MongoProperties mongoProperties;

    @Bean
    ReactiveMongoTransactionManager transactionManager(ReactiveMongoDatabaseFactory dbFactory) {
        return new ReactiveMongoTransactionManager(dbFactory);
    }

    @Override
    protected String getDatabaseName() {
        return mongoProperties.getDatabase();
    }

    @Override
    public MongoClient mongoClient() {
        return MongoClients.create(mongoProperties.getUri());
    }
}

应用程序属性 (与 mongo db 有关)

spring.data.mongodb.database=mongo
spring.data.mongodb.uri=mongodb://localhost:27017/mongo?replicaSet=rs0

文档类
角色类

@Getter
@Setter
@Accessors(chain = true)
@Document(collection = "roles")
@TypeAlias("role")
public class Role implements Persistable<String> {

    @Id
    private String id;

    @Field("role_name")
    @Indexed(unique = true)
    private String role;

    @CreatedDate
    private ZonedDateTime created;

    @LastModifiedDate
    private ZonedDateTime updated;

    private Boolean deleted;

    private Boolean enabled;

    @Override
    @JsonIgnore
    public boolean isNew() {
        if(getCreated() == null)
            return true;
        else
            return false;
    }
}

用户类

@Getter
@Setter
@Accessors(chain = true)
@Document(collection = "users")
@JsonInclude(JsonInclude.Include.NON_NULL)
@TypeAlias("user")
public class User implements Persistable<String> {

    @Id()
    private String id;

    @Field("username")
    @Indexed(unique = true)
    @JsonProperty("username")
    private String userName;

    @JsonProperty(access = JsonProperty.Access.WRITE_ONLY)
    private String password;

    @CreatedDate
    private ZonedDateTime created;

    @LastModifiedDate
    private ZonedDateTime updated;

    private Boolean deleted;

    private Boolean enabled;

    @DBRef(lazy = true)
    @JsonProperty("roles")
    private List<Role> roles = new ArrayList();

    @Override
    @JsonIgnore
    public boolean isNew() {
        if(getCreated() == null)
            return true;
        else
            return false;
    }
}

用户配置文件类

@Getter
@Setter
@Accessors(chain = true)
@Document(collection = "user_profiles")
@JsonInclude(JsonInclude.Include.NON_NULL)
@TypeAlias("user_profile")
public class UserProfile implements Persistable<String> {

    @Id
    private String id;

    @Indexed(unique = true)
    private String mobile;

    @Indexed(unique = true)
    private String email;

    private String address;

    private String firstName;

    private String lastName;

    @DBRef
    private User user;

    @CreatedDate
    private ZonedDateTime created;

    @LastModifiedDate
    private ZonedDateTime updated;

    private Boolean deleted;

    private Boolean enabled;

    @Override
    @JsonIgnore
    public boolean isNew() {
        if(getCreated() == null)
            return true;
        else
            return false;
    }

}

ReactiveMongoRepository 接口(interface)
角色存储库

public interface RoleRepository extends ReactiveMongoRepository<Role, String> {

    Mono<Role> findByRole(String role);

    Flux<Role> findAllByRoleIn(List<String> roles);

}

用户存储库

public interface UserRepository extends ReactiveMongoRepository<User, String> {

    Mono<User> findByUserName(String userName);

}

用户配置文件存储库

public interface UserProfileRepository extends ReactiveMongoRepository<UserProfile, String> {
}

用户服务类这里需要创建自己的RuntimeException类，这里是AppRuntimeException类，我一直在用

@Slf4j
@Service
public class UserService {

    @Autowired
    private RoleRepository roleRepository;

    @Autowired
    private UserRepository userRepository;

    @Autowired
    private UserProfileRepository userProfileRepository;

    @Transactional
    public Mono<UserProfile> saveUserAndItsProfile(final UserRequest userRequest) {

        Mono<Role> roleMono = roleRepository.findByRole("USER");

        Mono<User> userMono = roleMono.flatMap(r -> {
            User user = new User()
                    .setUserName(userRequest.getUsername())
                    .setPassword(userRequest.getPassword());
            user.setRoles(Arrays.asList(r));
            return userRepository.save(user);
        }).onErrorResume(ex -> {
            log.error(ex.getMessage());
            if(ex instanceof DuplicateKeyException) {
                String errorMessage = "The user with the username '"+userRequest.getUsername()+"' already exists";
                log.error(errorMessage);
                return Mono.error(new AppRuntimeException(errorMessage, ErrorCodes.CONFLICT, ex));
            }
            return Mono.error(new AppRuntimeException(ex.getMessage(), ErrorCodes.INTERNAL_SERVER_ERROR, ex));
        });

        Mono<UserProfile> userProfileMono = userMono.flatMap(u -> {
            UserProfile userProfile = new UserProfile()
                    .setAddress(userRequest.getAddress())
                    .setEmail(userRequest.getEmail())
                    .setMobile(userRequest.getMobile())
                    .setUser(u);
            return userProfileRepository.save(userProfile);
        }).onErrorResume(ex -> {
            log.error(ex.getMessage());
            if(ex instanceof DuplicateKeyException) {
                String errorMessage = "The user with the profile mobile'"+userRequest.getMobile()+"' and/or - email '"+userRequest.getEmail()+"' already exists";
                log.error(errorMessage);
                return Mono.error(new AppRuntimeException(errorMessage, ErrorCodes.CONFLICT, ex));
            }
            return Mono.error(new AppRuntimeException(ex.getMessage(), ErrorCodes.INTERNAL_SERVER_ERROR, ex));
        });

        return userProfileMono;

    }

}

Controller 和模型类
用户请求 模型类

@Getter
@Setter
@Accessors(chain = true)
@Slf4j
@JsonInclude(JsonInclude.Include.NON_NULL)
public class UserRequest {

    private String username;
    private String password;
    private String mobile;
    private String email;
    private String address;
    private String firstName;
    private String lastName;

}

UserProfileApisController 类(class)

@Slf4j
@RestController
@RequestMapping("/apis/user/profile")
public class UserProfileApisController {

    @Autowired
    private UserService userService;

    @PostMapping
    public Mono<UserProfile> saveUserProfile(final @RequestBody UserRequest userRequest) {
        return userService.saveUserAndItsProfile(userRequest);
    }

}