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Category Archives: Clojure
vectormap and pvectormap
So after attending Brian Goetz’ talk and Rich Hickey’s talk at JAOO Aarhus (eer, I mean Goto Aarhus), I was thinking about how to construct Clojure data structures in parallel. To start with something that wasn’t too complex, I decided … Continue reading
Assoc and Clojure’s PersistentHashMap: part ii
Some time ago I wrote introductory posts that gave high-level overviews of how Clojure’s PersistentVector and PersistentHashMap work. In the PersistentHashMap post I promised that “In part 2 we look at how assoc works…” – it seems I never got … Continue reading
clj-ds: Clojure’s persistent data structures for Java
One of the appealing features of Clojure is the pervasive use of (efficient!) persistent data structures. (In previous posts I’ve shed some light on how PersistentHashMap and PersistentVector are implemented, although some of that information is slightly dated now). There … Continue reading
Circuit Breaker: a small but real-life example of Clojure protocols and datatype
(Update July 2nd 2010: I’ve cleaned up the code and git repo. Inlined the protocol function definitions in the state records for native-platform speed. The policy can now specify which exceptions should be considered errors: this is really useful in … Continue reading
The Joy of Clojure
In case you haven’t noticed there is a very interesting Clojure book coming out, titled “The Joy of Clojure,” written by two very interesting authors that anyone hanging out in the Clojure community should know: Chris Houser and Michael Fogus. … Continue reading
Understanding Clojure’s PersistentHashMap (deftwice…)
[sept. 8th, 21:22: fixed a +/- 1 error] In a previous post, I gave a high-level description of how Clojure’s PersistentVector is implemented. While the code has changed, the description was high-level enough that the explanations still hold (although some … Continue reading
Clojure talks in Copenhagen and Aarhus – now with Azul Systems Clojure demo
Upcoming events: I am giving a talk on Clojure in Copenhagen and Aarhus – this is the first chance for a dcug meetup (though also non-dcug members are invited). The events are after work and free – there will even … Continue reading
JAOO 2009 discount (for Clojure users ;-)
I suggested to the JAOO program committee that the JAOO Aarhus 2009 conference should have a concurrency track. Their reply was “that’s a good idea – you are hosting it!” – this is how Trifork works The good thing is … Continue reading
One aspect of lazy computation
I’ve often needed to do a combination of filtering and mapping on arrays. E.g. in a Ruby on Rails app, I might have a list of “RecurringActivation” model objects which have a product_id and an integer period. Now I would … Continue reading
Clojure event sourcing
Event sourcing: Event Sourcing ensures that all changes to application state are stored as a sequence of events. Not just can we query these events, we can also use the event log to reconstruct past states, and as a foundation … Continue reading
Posted in Clojure, General, instanceof
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