Getting started with ArangoDB and Symfony 2 – part 4

02API, PHPTags:
This is part 4 (of 4) of an introduction to the use of ArangoDB together with Symfony 2. You’ll find the links to the other parts of this tutorial at the end of this text.
You can download the completed demo at Github.

Extending Arangodb\Document

The next thing we want to improve are all those noisy set calls in the controller:

More info

Feature Preview: Using CoffeeScript in ArangoDB

02General, JavascriptTags: ,

In my blog post about npm packages, I tried to use underscore for ArangoDB. I found that the easiest way to archive this, is using the nodes package manager NPM. Node packages and modules follow the Common.JS specification, so they can be used by ArangoDB.

Why not try to use the package coffee-script as well? Install it using

and that’s it. Unfortunately, CoffeeScript use a module “path”, which is not a CommonJS module. I assume that most of the functionality is part or will be part of the module “fs”. The “path.js” from node.js is simple JavaScript code with some references like

Being brave, I simply copied the file into my module path and tried again. The next obstacle is node’s global variable “process”. Luckily, this is only used to check for Windows in the module “path”. Also ignoring the module “vm” used to execute JavaScript code, this allows one to actually load CoffeScript into ArangoDB.

So, I can now use CoffeeScript definition within ArangoDB. Some of the loaders must be adjusted to check for both “.js” and “.coffee” files. Afterwards it should be possible, to define an action in CoffeeScript as well as JavaScript.

Feature Preview: Using NPM packages for ArangoDB

04Javascript, nodejsTags:

ArangoDB follows the Common.JS specification for modules. However, it would be very convenient, if there was an easy way to install a package like “underscore.js”. These package are, for instance, available using NPM. There is a draft for packages on Common.JS which seems to be compatible with NPM.

NPM has a neat way of dealing with version conflicts. Basically, it allows multiple versions to exists simultaneously. For example, assume you have 4 packages A, B, C, D. A requires B and C and D, B requires C. Then directory layout might be as follows.

Package B will see package C in version 1.0.0, while package A sees package C in version 2.0.0.

This behaviour is easy to implement in ArangoDB. In addition to “Module” there is now a “Package”. Each package has it own module cache. When a package requires a module, the package hierarchy is traversed from the current package to the root (or global) package, until the module is found.

In order to use underscore, switch into the package directory and use NPM to install it

Now start arangosh with the new “–javascript.package-path” option and enjoy underscore.

MRuby, JIT, and ArangoDB at RuPy 2012

00API, Presentation, RubyTags: ,

@moonbeamlabs and I hold a workshop about ArangoDB and the Ruby driver Ashikawa, which will hopefully become one of the first DataMapper 2 NoSQL drivers. Currently, we are using the aequitas and virtus components of DataMapper 2.

Slides of the workshop can be found on slideshare:

I also gave a short talk about the possibilities of using MRuby in ArangoDB. In preparation for this talk, Achim did some experiments using JIT compilation of the RiteVM bytecode using LLVM. The results are consistent with result for other byte-compiled languages. You can expect a speed-up of 2 using LLVM. In order to gain larger improvements one needs type inference and optimizations to the method selection. Luckily within a context like ArangoDB one can expects to be dealing a lot with primitives types (floats and strings) and a fixed environment. So it seems plausible that one can eventually get near the performace of V8.

MRuby Links

01Application Server, RubyTags:

I’ve started the following collection of links, example code, projects, and articles about mruby. This list is most likely not complete, if you have other interesting articles please let me know. Especially sample code and mruby projects.

Article

Examples & Projects

FAQ