spring-data-jpa-rest：如何在使用之前访问EntityManager但在OpenEntityManagerInViewInterceptor绑定之后

Question

在非HAL / REST世界中，这非常简单：

1. 注册servlet过滤器;
2. 在TransactionSynchronizationManager
中查找em holder
3. 拥有它。

似乎JPA / REST模块的作者已经“不知道如何在Spring中完成任务。”似乎没有办法以有意义的方式挂钩处理链。

我希望我只是缺少一些东西而且有人可以解决问题，但是在看了几天的例子并检查代码并尝试使用RestResource处理程序调用我自己的代码之后，我'我没有看到框架的设计是为了实际允许它。

指针欢迎。

Answer 1

首先，我创建了自己的OpenEntityManagerInViewFilter自定义子类。这有助于系统多租户支持。

然后我使用Spring配置连接自定义子类：

@Configuration
public class WebFilterConfig {

    private final Collection<String> urlPatterns;

    @Autowired
    @SuppressWarnings("SpringJavaAutowiringInspection")
    public WebFilterConfig(@Nonnull RepositoryRestConfiguration rrconfig) {
        String basePath = rrconfig.getBasePath().toString();
        if (!basePath.endsWith("/")) {
            basePath = basePath + "/";
        }
        urlPatterns = Collections.singletonList(basePath + "*");
    }

    @Bean
    public FilterRegistrationBean openEntityManagerInViewFilterRegistration() {
        FilterRegistrationBean filterRegistration = new FilterRegistrationBean(new OpenEntityManagerInViewFilter());
        // Consider leaving this unset and having this filter active on all requests
        filterRegistration.setUrlPatterns(urlPatterns);

        // Sometimes good to have this ordered before security...
        filterRegistration.setOrder(-1);
        return filterRegistration;
    }

    // Now add out custom filter to add multi-tenant support  
    @Bean
    public FilterRegistrationBean tenancyFilterRegistration() {
        FilterRegistrationBean filterRegistration = new FilterRegistrationBean(new MultiTenantFilter());
        filterRegistration.setName("tenancyDatabaseFilter");
        filterRegistration.setUrlPatterns(urlPatterns);
//        filterRegistration.setDispatcherTypes(EnumSet.allOf(DispatcherType.class));

        // This MUST be ordered after the OpenEntityManagerInViewFilter
        filterRegistration.setOrder(Ordered.LOWEST_PRECEDENCE);
//        filterRegistration.setOrder(100);

        return filterRegistration;
    }

}