Shey's Rebellion

Dependency Injection

My previous discussion on Inversion of Control raised some questions so I want to take a step back and discuss Dependency Injection. Dependency Injection is a pattern where software components (classes, methods or functions) are given their dependencies as parameters and these software components do not instantiate their dependencies directly. Dependency Injection is an important [...]

Moneytracking API, Ruby, Mash and HTTParty

Moneytrackin is a cool online accounting application that lets you track expenses and income, unlike other accounting applications it lets you add tags to each transactions. I love it! Tagging transactions makes it easier to track exactly where my money is going; not only can I see how much money I’ve spent on junk food [...]

Install sqlite3 for RoR on Windows Vista

SQLite is a great little embeddable database engine but the installation of the Ruby library is not obvious or straightforward on Windows XP or Vista. To install SQLite for Ruby 1.8, perform the following steps: download sqlitedll-3_6_18.zip, copy the two files that are part of the archive to your Ruby bin directory; run “gem install –version 1.2.3 sqlite3-ruby” [...]

Inversion of Control in Python

Coming from a .NET background and having applied SOLID principles to software development, I was surprised by the lack of inversion of control containers for Python. The few discussions I read online implied that Python doesn’t need an IoC framework because it is a dynamically typed language. Dynamically typed languages eliminate the need to use interfaces, [...]

Change point analysis in Python

With most of the paperwork done I’ve started to make use of my free time in Toronto. In an effort to improve my Python programming I implemented a cummulative sum estimation based change point detection algorithm in Pyton based on an article by Dr. Wayne A. Taylor. The changepoint project is available on Google code– [...]

Not so random personal update

I’m moving to Canada! By the time this post is published, I should be 40,000 ft. in the air, relaxing, reflecting upon a dream come true. Blogging and tweeting will be light as I get settled in my new home in Canada. AgilePakistan.org needs a new lead, if anyone in Karachi wants to take over AgilePakistan.org [...]

Erlang Exercise: Implementing Talk with Distributed Erlang

Here’s my solution for the Talk with Distributed Erlang exercise. You can run the program by calling the start function, but first you must generate a cookie and start two named Erlang nodes using the following commands: echo -n “dh32d8yhd8″ > erlang.cookie erl -name Node1 -cookie erl -name Node2 -cookie

AMQP Kool-Aid Part 1.5: RabbitMQ Benchmark

Introduction As stock markets open, order management systems are flooded with new orders and it’s crucial that an OMS not miss prices or drop orders during this period. The purpose of this initial benchmark is to simulate a flood of orders hitting the queue. Benchmark The benchmarking script sets up 10 queues, 10 producers and 10 consumers, each [...]

Taking a sip of the AMQP Kool-Aid Part I

Overview Performance is vital in the world of stock trading, you can easily lose hundreds of thousands of dollars if the trading platform you’re using routes orders to the stock exchanges too slowly and you miss the your target price. The order management system I work on uses IRC as the messaging middle ware– a message is [...]

Questioning ASP.NET MVC

ASP.NET MVC has always bothered me; even now I’m not sure exactly what bothers me, but it’s enough to make me question using .NET to develop web applications. No longer working at a .NET shop and having escaped from the realty distortion field I’ve pushed myself to revaluate languages and frameworks which I had ignored [...]