173 posts tagged with "technology"

A common challenge for development teams is remembering the names for all of the different servers in an enterprise environment when the server naming convention is either not descriptive ("Deathstar", "Falcon", "XWing") or obscure ("abcDBS001", "abcDBS002", "abcWEB01"). The Star Wars names suffer from an obvious problem of mapping description to purpose. Those obscure names are commonly used to help distinguish between dozens to hundreds of different servers in an enterprise. Arguably they are helpful to the infrastructure team as they manage this motley collection. But for a developer, remembering if "abcWEB01" is the test web server or prod can be challenging; even when remembered, it would be simple enough to overlook or accidentally type "abcWEB04".

Historically I've advocated naming test methods after the method under test, in order to help find the tests when you need to modify them. Growing Object-Oriented Software, Guided by Tests has shown me that this is a relic of a code-first mentality rather than good application of test driven development, primarily in the section "Test Names Describe Features" (ch 21). "Test driven" development implies that we do not know the name of the method we're going to test. But we do know the functionality (feature) that we are going after, and that knowledge should be used when writing out a test name. For example:

For years I've had problems with SSIS deployments to production. In fact, I completely abandoned SSIS packages because it was so difficult to deploy to production (in SQL Server 2005): I always ended up with errors that would require me to hand-edit the file and hard-code paths. That, despite the fact that my config files have the database connection strings and file paths in them. And despite the fact that my packages usually work fine on the test server but fail in production. After years of this problem, it suddenly occurred to me that one piece in particular is probably at fault. But given that I do not have access to production such that I can investigate, it will always be a hypothesis: using a template that sets various properties with the help of variable expressions.

Assuming that you are already sold on the notion of automated testing, it can be useful to put a little thought into how projects will be setup. There are many approaches to this; my approach is based on experience, the wisdom in xUnit Test Patterns, and standard coding best practices. I will try to keep this language agnostic, though my examples will be in C#.

"The best way to attack the essence of building software," Dr. Brooks writes, "is not to build it at all." (p222). With this he introduces a brief discussion of the importance of code reuse, and of its challenges.

Recently I began carving out some time for using CruiseControl.Net in earnest. The book Continuous Integration in .Net was, and I'm sure will continue to be, of great help. Nevertheless, I think it will behoove my own memory, and perhaps help a few others, to record some notes on a few practical details.

I've started a new project on CodePlex, called Reggie, and posted the initial working source code. Reggie's goal is to be a simple developer tool for writing and testing Regular Expressions. It is inspired by the venerable Regulator tool and will be created in WPF using the MVVM pattern.

In the chapter titled "Plan the System for Change," Dr. Brooks again lays out the foundations for Agile software development. His was an era of dumb-terminals and highly scheduled availability. And yet, here he is saying, "plan to throw one away; you will, anyhow." When RAM wasn't cheap, and good programmers even more rare than today, how does a project manager or architect justify throwing out the first design on purpose? By recognizing that "[t]he only question is whether to plan in advance to build a throwaway, or to promise to deliver the throwaway to customers."

Many of the recommendations Dr. Brooks makes in this work can seem outdated at first glance; however, it does not take much to bring them into today's software development environments. Take the telephone log for example:

"One useful mechanism is a telephone log kept by the architect. In it he records every question and every answer. Each week the logs of the several architects are concatenated, reproduced, and distributed to the users and implementers. While this mechanism is quite informal, it is both quick and comprehensive." (p69)

Aside from being a fascinating inside-look at some of the challenges faced by the mainframe programmers of the sixties, The Mythical Man-Month presents many lessons-learned that are no less applicable today. This is the second article in a series exploring some of these lessons, in particular: conceptual integrity.