Design Consideration for SaaS Application

1. Asynchronous Logging
2. Asynchronous Auditing
3. Tenant level Logging
4. Tenant level Auditing
5. Tenant Aware Controller
6. Functionality Aware Controller
7. Hierarchy of Meta Data Objects
8. Tenant Aware Data Objects
9. Clear demarcation of data on the basis of where to store – RDBMS, Hierarchical data base – LDAP, File system, NOSQL, etc.
10. Usage of Virtual Database or similar technique
11. Tenant aware load balancer
12. Tenant aware data store
13. Caching to be used at every level – View, controller and data layer and must be tenant aware and policies must be well defined
14. Fault Barrier pattern for Exception Handling
15. Heart beat like mechanism
16. Do not treat business conditions as business exception