Software Design Architecture Comparison

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Title Software Design and Architecture Comparison (Eclipse vs Openstack)
Overview Students will research existing software design documents and resources for both projects and then write a report detailing their differences and helpfulness to various levels of developers.
Prerequisite Knowledge Students should have:
  • Taken a CS1 course (Introduction to Programming).
    • Already learned syntax and the basics of a programming language.
    • Already learned simple data structures.
  • Rudimentary software design knowledge
    • Could be delivered along-with this activity
    • Ex: Design Patterns knowledge
Learning Objectives Upon completion, students should:
  • Understand how thoughtful software design is encouraged, or not, in open source communities.
  • Be able to give examples of software design artifacts, and how to go about finding them.
  • Realize what they consider good software design, and be able to back it up with reason.
  • Realize why software design is important, and how it will effect them in their future careers.


Is there background reading material?

What is the rational for this activity?

For students, who are often novice and beginner developers, it is critical to understand the big-picture when jumping into a new software project. A proper view of the system-wide architecture can bring context on how the entire system works, instead of focus on a particular component. When you can have knowledge of other pieces of the puzzle, you tend to implement better code because it is thoughtful of how your current focus interacts with functionality around it and even to functionality seemingly far-removed. Students need to be aware of why this helps them and their career, how to find this kind of documentation, and that it might shape their opinions and focus when choosing projects to interact with.

Are there any similar activities?

See OpenMRS_Design_Reverse_Engineering_Activity_(Android_App) for an activity that has students reverse engineer a design / architecture from an existing open source Android applications codebase.


Part 1: Eclipse and OpenStack Designs and Architectures

In this activity, we will focus on the Eclipse IDE (Platform) project and the OpenStack cloud project. Below, you will learn about these projects and their open communities. After this, you will compare and contrast the design and architecture artifacts available in these communities.

Both projects are open source and very large, with many hundreds of participants. Be aware that you will not be able to immediately jump into the code of these projects. We will take a process below where we progress our knowledge bit by bit. You can easily use this process again for future projects.

Eclipse is an Integrated Development Environment (IDE) that runs on desktop computers. An IDE is basically a fancy code-editor for developers who are creating software. A developer needs not only edit code in text files, but also to run the code, debug the code (possibly stepping through the code one-line at a time, looking for a bug), they need to see hierarchical views of the classes, and have ease-of-use functions like code completion (you can't remember which function you want to use, and the IDE gives you a list of choices while you are typing). Eclipse centers on Java development, though it is also usable for dozens of other languages. Do not confuse the 'Eclipse IDE' with the 'Eclipse Foundation', which was created after the successful IDE and now encompasses hundreds of open source project.

OpenStack is a cloud infrastructure platform. Bacon ipsum dolor amet venison short loin porchetta, cow picanha swine corned beef tri-tip fatback pork belly sirloin landjaeger leberkas. Capicola ball tip ham fatback hamburger alcatra short ribs shoulder meatloaf corned beef tri-tip pancetta brisket. Salami biltong kielbasa swine porchetta cupim. Hamburger tongue sirloin drumstick boudin corned beef ham shoulder ground round meatloaf ribeye alcatra tri-tip landjaeger kielbasa. Chicken strip steak kevin turkey drumstick bresaola salami bacon ground round. Kevin picanha sirloin tri-tip jerky.

Read the following fully:

Additional readings and design/architecture documents:

Because these are projects that you may know little or nothing about, first delve into the basics. Gather a quick understanding of each project from a user's point of view. What functionality does each project provide its users? Next, gather some technical statistics. Use tools such as Ohloh (now OpenHub) to get general technical stats and background. What programming languages are used? What percentage of the code are comments? Mention other general statistics or information that might be helpful when reading into a projects design and architecture.

Next step is delve into the high-level design or architecture of each project. How do high-level modules and packages work together? Does the project have a data layer or store? How does each system handle


  • What functionality does each project provide its users?
  • What programming languages are used?
  • What percentage of the code are comments? Other?

Part 2: Comparison

Eclipse-specific questions: Explain the plugin concept and why it is centrally important to Eclipse. Which component model did Eclipse switch to and why? Explain Eclipse's decision to refactor and generalize their bundles for RCP applications. These design decisions opened their software up to uses they had not dreamt of, such as monitoring the Mars rover. How is this a perfect example of software reuse and modularization?


What will the student hand in?


How will the activity be graded?

How will learning will be measured?

Include sample assessment questions/rubrics.

Criteria Level 1 (fail) Level 2 (pass) Level 3 (good) Level 4 (exceptional)
The purpose of the project
Why the project is open source


What should the instructor know before using this activity?

Encourage students to find new design and architecture information. They should be scouring the sites wiki's, code, documentation, etc. Because these communities are large, their resources will grow and change over time. What was there one semester, may not be there another semester. Or, they may add design documentation that formerly was not there. The links given to students should be a guide - they are not exhaustive.

What are some likely difficulties that an instructor may encounter using this activity?

Additional Information:

ACM Knowledge Area/Knowledge Unit What ACM Computing Curricula 2013 knowledge area and units does this activity cover? ACM_Body_of_Knowledge
ACM Topic What specific topics are addressed? The Computing Curriucula 2013 provides a list of topics -
Level of Difficulty Is this activity easy, medium or challenging?
Estimated Time to Completion How long should it take for the student to complete the activity?
Materials/Environment What does the student need? Internet access, IRC client, Git Hub account, LINUX machine, etc.?
Author Nick Yeates
Source Is there another activity on which this activity is based? If so, please provide a link to the original resource.
License Creative Commons CC-BY

Suggestions for Open Source Community:

Suggestions for an open source community member who is working in conjunction with the instructor.

This work is licensed under a Creative Commons Attribution 4.0 International License


Note: Can be removed later, or kept as a resource to teaches looking into other communities.

Potential communities to look into:

Background Readings

Personal tools
Learning Resources
HFOSS Projects