Design for my HTTP Server

I recently started working on building an HTTP server using Java. I thought it might be a good idea to come up with a design, based on what I thought needed to happen in the program. This post outlines the initial designs I came up with, the approach I took to evolving the design, and some takeaways from the experience.

The first design I came up with is shown in the following diagram:

At this point I had a better idea of what a server does, as well as how to structure my program. I drew another diagram that I thought would better represent what my design should look like:

The flow I adopted was to select the next test to get to pass, decide what functionality I needed to add, and slowly add it to my application. Since I was following TDD, I would focus on writing small tests, getting them to pass, and refactoring when I was done. After finishing a feature, I would see if I could do a larger refactor to improve the structure of the code. For the most part, this worked out well, and I ended up with the design I have now.

When trying to draw out the design of the current state of my application, I tried following the same pattern as in the previous two diagrams, but ultimately it didn’t work. I believe using some sort of UML diagram might be more effective. For now, I will list out the classes that I have, along with short descriptions of what they do (and maybe write a follow up post with more detailed UML diagrams after my design has evolved further).

Classes:

Here are some of my main takeaways from trying to design most of my application from the get go, and from my experiences in slowly evolving it afterwards:

Overall it has been a great process seeing how classes have been added and removed, and I look forward to seeing what design I finally end up with.

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