多租户设计

目录

一、多租户是什么？

二、多租户数据隔离方案

三、实现步骤

1.引入库

2.配置文件 META-INF/spring.factories

3.TenantConfiguration

4.TenantProperties

5.TenantHandler

6.TenantInterceptor

7.MybatisPlusProperties

8.MybatisAutoConfiguration

9.引用租户模块

总结

---

一、多租户是什么？

• 多租户技术是一种软件架构技术，是实现如何在多用户（一般是面向企业用户）的环境下共用相同的系统或程序组件，并且可确保各用户间数据的隔离性。

• 多租户技术可以实现多个租户之间共享系统实例，同时又可以实现租户的系统实例的个性化定制。

• 通过在多个租户之间的资源复用，有效节省开发应用的成本。在租户之间共享应用程序的单个实例，可以实现当应用程序升级时，所有租户可以同时升级。

二、多租户数据隔离方案

• 独立数据库

• 共享数据库，隔离数据架构

• 共享数据库，共享数据架构

 采用方案：共享数据库，共享数据架构（租户ID隔离）

三、实现步骤

1.引入库

<!--mybatis-->
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
</dependency>

<!--数据库-->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
</dependency>

<!--dynamic-datasource-->
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>dynamic-datasource-spring-boot-starter</artifactId>
</dependency>

2.配置文件 META-INF/spring.factories

org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
    com.ronshi.common.tenant.config.TenantConfiguration

3.TenantConfiguration

@Configuration(proxyBeanMethods = false)
@AutoConfigureBefore({MybatisAutoConfiguration.class})
@EnableConfigurationProperties({TenantProperties.class})
public class TenantConfiguration {
 
    @Bean
    @ConditionalOnMissingBean({TenantLineHandler.class})
    public TenantLineHandler tenantHandler(TenantProperties tenantProperties) {
        return new TenantHandler(tenantProperties);
    }
 
    @Bean
    @ConditionalOnMissingBean({TenantLineInnerInterceptor.class})
    public TenantLineInnerInterceptor tenantLineInnerInterceptor(TenantLineHandler tenantHandler, TenantProperties tenantProperties) {
        TenantInterceptor tenantInterceptor = new TenantInterceptor();
        tenantInterceptor.setTenantLineHandler(tenantHandler);
        tenantInterceptor.setTenantProperties(tenantProperties);
        return tenantInterceptor;
    }
}

4.TenantProperties

@Data
@ConfigurationProperties(prefix = "ronshi.tenant")
public class TenantProperties {
    private Boolean enhance;
    private String column;
    private List<String> excludeTables;
    private List<String> matchUrls;
    private List<String> excludeUrls;
 
    public TenantProperties() {
        this.enhance = Boolean.FALSE;
        this.column = "tenant_id";
        this.excludeTables = new ArrayList<>();
        this.matchUrls = new ArrayList<>();
        matchUrls.add("/**");
        this.excludeUrls = new ArrayList<>();
    }
}

5.TenantHandler

public class TenantHandler implements TenantLineHandler, SmartInitializingSingleton {
    private final TenantProperties tenantProperties;
 
 
    @Override
    public Expression getTenantId() {
        Long tenantId = TenantUtil.getTenantId();
        if (tenantId == null) {
            throw new RuntimeException("请设置租户ID");
        }
        return new LongValue(tenantId);
    }
 
    @Override
    public String getTenantIdColumn() {
        return this.tenantProperties.getColumn();
    }
 
    @Override
    public boolean ignoreTable(String tableName) {
        return this.tenantProperties.getExcludeTables().contains(tableName);
    }
 
    @Override
    public void afterSingletonsInstantiated() {
        // 实例化后执行
    }
 
 
    public TenantHandler(final TenantProperties tenantProperties) {
        this.tenantProperties = tenantProperties;
    }
}

6.TenantInterceptor

@Data
public class TenantInterceptor extends TenantLineInnerInterceptor {
    private TenantProperties tenantProperties;
 
}

7.MybatisPlusProperties

@ConfigurationProperties(prefix = "ronshi.mybatis-plus")
@Data
public class MybatisPlusProperties {
    private Boolean tenantMode = false;
}

8.MybatisAutoConfiguration

@Configuration(proxyBeanMethods = false)
@EnableConfigurationProperties({MybatisPlusProperties.class})
public class MybatisAutoConfiguration {
 
    @Bean
    @ConditionalOnMissingBean({TenantLineHandler.class})
    public TenantLineHandler tenantLineHandler() {
        return new TenantLineHandler() {
            @Override
            public Expression getTenantId() {
                return new LongValue(0L);
            }
 
            @Override
            public boolean ignoreTable(String tableName) {
                return true;
            }
        };
    }
 
    @Bean
    @ConditionalOnMissingBean({TenantLineInnerInterceptor.class})
    public TenantLineInnerInterceptor tenantLineInnerInterceptor(TenantLineHandler tenantHandler) {
        return new TenantLineInnerInterceptor(tenantHandler);
    }
 
 
    /**
     * 插件主体
     *
     * @return MybatisPlusInterceptor
     */
    @Bean
    public MybatisPlusInterceptor mybatisPlusInterceptor(TenantLineInnerInterceptor tenantLineInnerInterceptor, MybatisPlusProperties mybatisPlusProperties) {
        MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
        //判断是否为租户模式
        if (Boolean.TRUE.equals(mybatisPlusProperties.getTenantMode())) {
            interceptor.addInnerInterceptor(tenantLineInnerInterceptor);
        }
        interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));
        return interceptor;
    }
 
}

9.引用租户模块

<!--多租户数据隔离 模块-->
<dependency>
     <groupId>com.ronshi</groupId>
     <artifactId>tenant-starter</artifactId>
</dependency>

ronshi:
  mybatis-plus:
    tenant-mode: true
  tenant:
    exclude-tables:
      - tenant

---

总结

租户模块分包，可根据服务是否为多租户模式，来选择是否加载租户模块。租户字段名称和拦截的表名动态配置。采用了配置属性类、配置类、拦截类、处理类分离的模式，可以灵活扩展。