Val on Programming: Datomic: Event Sourcing without the hassle
Why Event Sourcing?How Event Sourcing is usually doneDifficulties of conventional Event SourcingDesigning Event Types and Event Handlers is hard workDetecting indirect changes is still hardTransactionality is difficult to achieveConflating Commands and EventsHow Datomic does itDatomic's modelProcessing Events with DatomicCost-benefit analysisConclusionSee also When I got started using the Datomic
Datomic - Datomic is Free
Nubank is excited to announce today that we are making all editions of Datomic available free of licensing fees. The Datomic binaries are being released under the Apache 2.0 license and will be readily available for direct download and use via Maven Central - no signup required. Datomic Cloud will be available on AWS Marketplace with no additional software cost. We are doing this to make Datomic m
Unofficial guide to Datomic internals
Unofficial guide to Datomic internals Disclaimer: I do not work for Cognitect and, unfortunately, haven’t seen any source code of Datomic. I just made it through a lot of public talks, docs and google group answers about Datomic. This post is a compilation thereof. Intention is to help others use Datomic more efficiently by understanding what they are doing. Persistence Datomic models all data as
Using Datomic as a Graph Database
by Andrew Dennis on April 10, 2014 Datomic is a database that changes the way that you think about databases. It also happens to be effective at modeling graph data and was a great fit for performing graph traversal in a recent project I built. I started out building a six degrees of Kevin Bacon project using [Neo4j][], a popular open-source graph database. It worked very well for actors that were
rkn.io - Datomic Antipatterns: Conn as a Value
One of the most common faux pas I see in the Datomic-wilds is creating functions that eschew the database as a value (e.g. accepting db as an argument). Instead, they treat the connection as a value. Their functions accept conn as an argument, or worse, retrieve the connection from some global state. The Trouble with Conn At best, this practice can save you a bit of typing. At worst, it’ll cost yo
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Learn Datalog Today!
Learn Datalog Today is an interactive tutorial designed to teach you the Datomic dialect of Datalog. Datalog is a declarative database query language with roots in logic programming. Datalog has similar expressive power as SQL. Datomic is a database with an interesting and novel architecture, giving its users a unique set of features. You can read more about Datomic at https://datomic.com and the
Building a Forum with Clojure, Datomic, Angular, and Ansible
Building a Forum with Clojure, Datomic, Angular, and Ansible After many long months I've finished re-writing Grateful Place. The site now uses Clojure as an API server, with Datomic for the database, Angular for the front end, and Vagrant and Ansible for provisioning and deployment. This setup is awesome, the best of every world, and I love it. Below we'll dive into the code base, covering the mos
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