This is the first part of a series of articles on a small experiment I’m building. The intent is to crawl TVTropes, to find possible relationships between tropes and the material they appear in, as well as shared concepts.
I want to be able to not only visualize a concept and the tropes that it links to, but also how they relate to each other. A bonus would be being able to query how far away a concept is from another - for instance, how many steps we need to take before we can go from Cowboy Bebop to Macross Missile Massacre.
This one bit me a bit hard and, seeing as I could find only one reference for it in the context of Clojure and Leiningen, I thought a small write-up would help.
After including some ClojureScript code on my project, lein started barfing when I attempted to build an uberjar with any optimization settings other than none.
Exception in thread “main” java.lang.NoSuchMethodError: com.google.common.io.ByteStreams.limit(Ljava/io/InputStream;J)Ljava/io/InputStream;, compiling:(/private/var/folders/64/ckdtdxm14059n9wh8rhf1mvw0000gn/T/form-init527739448955044836.clj:1:123)
There was only one obscure reference I found, from an IRC chat now a couple of years old. My first thought was that something in the ClojureScript code was throwing off the compiler, but it seemed odd that this would trigger a call to a specific non-existent method.
Other searches - outside of the lein context - made me realize it was actually a dependency conflict, and only triggered on uberjar because since there wasn’t any ClojureScript code deployed before the compiler hadn’t had to be invoked.
lein deps :tree
showed there were multiple versions of com.google.guava being referenced, with the one used by ClojureScript being 18.0 but a much older 11.0.1 being referenced by urly. Seems like lein either doesn’t realize there’s a conflict or defaults to the older library, which was causing the error when ClojureScript attempted to build.
The set up
This whole thing started not as a performance test, but as me experimenting with ClojureScript and Quil while reading Matt Pearson’s Generative Art. As such, it is not the most scientific of comparisons, and instead born out of my notes when exploring how to do sketches with ClojureScript for the web.
Consider the following example:
On the datatypes chapter of Programming Clojure 2nd edition (page 155) there’s the following bit where the CryptoVault is extended to support the default input streams:
The calls to spit/slurp didn’t work on my tests at first, even reloading the namespace.