使用多租户时的 Spring Boot 范围问题

Posted 2023-04-12

【中文标题】使用多租户时的 Spring Boot 范围问题

【英文标题】：Spring boot scope issue when using multitenancy

【发布时间】：2015-09-20 11:46:49

【问题描述】：

我尝试使用此答案中的代码为我的 spring boot 1.2.5 添加多租户：

Setting up a MultiTenantConnectionProvider using Hibernate 4.2 and Spring 3.1.1

我得到以下异常：

Caused by: java.lang.IllegalStateException: No thread-bound request found: Are you referring to request attributes outside of an actual web request, or processing a request outside of the originally receiving thread? If you are actually operating within a web request and still receive this message, your code is probably running outside of DispatcherServlet/DispatcherPortlet: In this case, use RequestContextListener or RequestContextFilter to expose the current request.
        at org.springframework.web.context.request.RequestContextHolder.currentRequestAttributes(RequestContextHolder.java:131)
        at org.springframework.web.context.request.AbstractRequestAttributesScope.get(AbstractRequestAttributesScope.java:41)
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:337)

上述答案的源代码是：

@Component
@Scope(value = "request", proxyMode = ScopedProxyMode.TARGET_CLASS)
public class RequestURITenantIdentifierResolver implements CurrentTenantIdentifierResolver 
    @Autowired
    private HttpServletRequest request;
    @Override
    public String resolveCurrentTenantIdentifier() 
        String[] pathElements = request.getRequestURI().split("/");
        String tenant = pathElements[1];
        return tenant;
    
    @Override
    public boolean validateExistingCurrentSessions() 
        return true;
    

我尝试将范围值更改为原型：

@Scope(value = "prototype", proxyMode = ScopedProxyMode.TARGET_CLASS)

在我尝试在我的 JpaRepository 中使用 @Query 之前效果很好，例如：

@Query("From Order where orderId = :id")
public Order joinWithPurchaseItems(@Param("id") Integer id);

它会抛出同样的异常：

Caused by: java.lang.IllegalStateException: No thread-bound request found: Are you referring to request attributes outside of an actual web request, or processing a request outside of the originally receiving thread? If you are actually operating within a web request and still receive this message, your code is probably running outside of DispatcherServlet/DispatcherPortlet: In this case, use RequestContextListener or RequestContextFilter to expose the current request.
        at org.springframework.web.context.request.RequestContextHolder.currentRequestAttributes(RequestContextHolder.java:131)
        at org.springframework.web.context.request.AbstractRequestAttributesScope.get(AbstractRequestAttributesScope.java:41)
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:337)

有趣的是，使用本机查询不会引发此异常。

我还尝试在我的 Application 类中使用 RequestContextListener，但没有成功：

@SpringBootApplication
public class Application 

    @Bean
    @ConditionalOnMissingBean(RequestContextListener.class)
    public RequestContextListener requestContextListener() 
        return new RequestContextListener();
     

    public static void main(String[] args) 
        SpringApplication.run(Application.class, args);
    

感谢任何帮助。

【问题讨论】：

请求范围不起作用。删除范围。而是使用RequestContextHolder 来获取RequestContext 并在上下文中使用getRequest。或使用Filter 将某些内容放入ThreadLocal 并让您的CurrentTenantIdentifierResolver 使用ThreadLocal。示例代码可以在here 找到。额外的优点是它更通用，您还可以将它用于主题、资源加载等。

过滤方法运行良好。谢谢！我查看了示例代码，它有一些有趣的功能，我认为如果它有更多的文档将会非常有用..

【参考方案1】：

正如评论中所建议的，我改用过滤器并从那里捕获 URL。解析器从过滤器设置的静态字段中捕获架构名称。