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Learning about bitmaps

A few weeks ago Alistair and I were working on the code used to model the labels that a node has attached to it in a Neo4j database. The way this works is that chunks of 32 nodes ids ...

RxJava: From Future to Observable

I first came across Reactive Extensions about 4 years ago on Matthew Podwysocki’s blog but then haven’t heard much about it until I saw Matthew give a talk at Code Mesh a few weeks ...

Java: Schedule a job to run on a time interval

Recently I’ve spent some time building a set of tests around rolling upgrades between Neo4j versions and as part of that I wanted to log the state of the cluster as the upgrade was ...

Neo4j: Making implicit relationships explicit & bidirectional relationships

I recently read Michal Bachman’s post about bidirectional relationships in Neo4j in which he suggests that for some relationship types we’re not that interested in the relationship’s ...

Neo4j: Exploring new data sets with help from Neo4j browser

One of the things that I’ve found difficult when looking at a new Neo4j database is working out the structure of the data it contains. I’m used to relational databases where you ...

Java: Incrementally read/stream a CSV file

I’ve been doing some work which involves reading in CSV files, for which I’ve been using OpenCSV, and my initial approach was to read through the file line by line, parse the contents ...

Elo Rating System: Ranking Champions League teams using Clojure

As I mentioned in an earlier blog post I’ve been learning about ranking systems and one of the first ones I came across was the Elo rating system which is most famously used to rank ...

Clojure: All things regex

I’ve been doing some scrapping of web pages recently using Clojure and Enlive and as part of that I’ve had to write regular expressions to extract the data I’m interested in. On ...

Jersey Client: Testing external calls

  Jim and I have been doing a bit of work over the last week which involved calling neo4j’s HA status URI to check whether or not an instance was a master/slave and we’ve been ...

neo4j/cypher: Getting the hang of query parameters

For as long as I’ve been using neo4j‘s cypher query language Michael has been telling me to use parameters in my queries but the performance of the queries was always acceptable ...
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