ramsrib / Multi Tenant App Demo
Demonstrates the discriminator field (shared schema) based multi-tenant application using Spring Boot & Hibernate 5.
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README
Sample Application to demonstrate Multi-tenancy based on discriminator field using Spring Boot & Hibernate.
Since hibernate (5.x) has some issues (refer the link below) in supporting the 'Discriminator' based multi-tenancy strategy. This following workaround will help to achieve the same.
Approach:
- 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.
Explanation:
- Each request goes thru a custom servlet filter which checks for
X-TenantIDhttp header and set's it in the ThreadLocal variable usingTenantContextclass. If http header is not present in request, it'll be rejected. - Controller routes the request to Service class and the Spring AOP (
UserServiceAspectclass) intercepts the service call and set's the hibernate tenant filter. - All the service method has to be annotated with
@TransactionalforUserServiceAspectto 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
TenantSupportinterface for the Entity interceptor to work.
Refer:
- https://hibernate.atlassian.net/browse/HHH-6054
- https://docs.jboss.org/hibernate/orm/5.2/userguide/html_single/Hibernate_User_Guide.html#multitenacy
- https://docs.jboss.org/hibernate/orm/5.2/userguide/html_single/Hibernate_User_Guide.html#mapping-column-filter
- https://docs.jboss.org/hibernate/orm/5.2/userguide/html_single/Hibernate_User_Guide.html#events
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