This session will explore four common problems, and the unique and surprising tools Datomic provides to solve them elegantly:

   HTTP caching - How to generically generate and validate Last-Modified and If-Modified-Since headers
   Audit trail - how to extend Datomic’s immutable transaction log to include arbitrary audit related metadata
   Mobile database sync - trivial implementation of an incremental update API for high latency/low bandwidth clients
   Authorization - easily determine resource ownership, and centrally isolate users from data they are not allowed to see

These problems have certainly been solved before using other databases, but Datomic provides features that make the proposed implementations concise, generic, and purely functional.

Lucas Cavalcanti is the Lead Software Engineer of Nubank, an early stage Brazilian Internet bank built as a service oriented architecture leveraging Clojure and Datomic. Lucas is a functional programming enthusiast, and proponent of best practices in software…