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Spring Boot 2 Multi-Tenant Example

This application demonstrates multi-tenancy in a Spring-Boot 2 app using a discriminator field with Hibernate.

Usage

Run the app:

$ createdb spring-multi-tenancy
$ ./mvnw clean spring-boot:run

From another terminal:

$ curl localhost:8080/employees -H "X-TenantID: tenant1" 
[{"userId":"16b5308b-6bb8-4a75-ae93-66dc71a0b981","firstName":"John","lastName":"Doe","tenantId":"tenant1"}]

$ curl localhost:8080/employees -H "X-TenantID: tenant3" 
[]

$ curl localhost:8080/employees -H "X-TenantID: tenant3" -H "Content-Type: application/json" -X POST -d '{"firstName":"joe"}'
{"userId":"c77ad6bb-b2ad-47f7-b21c-3e50deb6a574","firstName":"joe","lastName":null,"tenantId":"tenant3"}

$ curl localhost:8080/employees -H "X-TenantID: tenant3" 
[{"userId":"c77ad6bb-b2ad-47f7-b21c-3e50deb6a574","firstName":"joe","lastName":null,"tenantId":"joe"}]

Detailed Description

  • Uses hibernate filter to limit the query results based on tenant.
  • Uses hibernate interceptors to enforce tenant details during creating/updating entities.
  • Uses Spring AOP (AspectJ) to set the filter parameters.
  • Each request goes thru a custom servlet filter which checks for X-TenantID http header and set's it in the ThreadLocal variable using TenantContext class. If http header is not present in request, it'll be rejected.
  • Controller routes the request to Service class and the Spring AOP (EmployeeServiceAspect class) intercepts the service call and set's the hibernate tenant filter.
  • All the service method has to be annotated with @Transactional for EmployeeServiceAspect to work.
  • Above method works only for read queries, for write queries, we have to use hibernate interceptors.
  • Custom Entity interceptor (using EmptyInterceptor) class which sets the tenantId value during the save/delete/flush-dirty entity events.
  • Entity class should implement TenantSupport interface for the Entity interceptor to work.

More Info

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License

MIT

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