Code Base Understanding

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|'''Title''' || Code Base understanding  
 
|'''Title''' || Code Base understanding  
 
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|'''Overview''' || High level description of what the student will do  
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|'''Overview''' || High level description of what the student will do Students will navigate a complex Java code base using a number of different techniques or strategies to understand the design and architecture.
 
|-  
 
|-  
|'''Prerequisite Knowledge''' || What topics and tools does the student need to know prior to beginning this activity?
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|'''Prerequisite Knowledge''' || CS 2- Data structures in Java
|-
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|'''Learning Objectives''' || What should the student be able to do after completing this activity?  
|'''Learning Objectives''' || What should the student be able to do after completing this activity?
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The student should be able to:
 +
Follow specific strategies to understand the code
 +
Analyze the critical components of the code base
 +
Understand the importance of dependencies and coupling/decoupling
 +
Understand the importance of technical documentation in understanding the code
 +
Utilize visualization tools to navigate and understand complex codebase
 +
 
 
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=== Background: ===
 
=== Background: ===
Is there background reading material?
+
Is there background reading material?  
 +
*Josh will add*
  
Are there other activities the student should have done first?
+
Are there other activities the student should have done first?  
 +
* Read technical documentation specific to the project (project installation, tools needed, APIs) - assumption is that the environment is already installed
  
What is the rationale for this activity?
+
* Run the program, understand the behavior of it
 +
Come up with an enhancement - provides the motivation for this activity
 +
 
 +
 
 +
What is the rationale for this activity? Students cannot become contributors to HFOSS projects until they understand the code base. This activity provides a number of strategies to help students approach a new code base and make sense of it. It has starting points (such as looking at unit testing) and more advanced techniques (such as using visualization tools to understand dependencies).
  
 
Include helpful hints to faculty here.
 
Include helpful hints to faculty here.
 +
Visualization tools for Java:
 +
Code City: https://marketplace.eclipse.org/content/codecity
 +
X-Ray: https://marketplace.eclipse.org/content/x-ray-software-visualization
 +
JDeodorant https://marketplace.eclipse.org/content/jdeodorant
  
 +
This activity is designed for Eclipse.
 +
Suggestion: have students work in groups
 +
 +
Potential Problems in this activity:
 +
code base changes
 +
may not find what you are looking for - it may not contain unit tests, etc.
  
 
=== Directions: ===
 
=== Directions: ===
 
What should the student do?
 
What should the student do?
 +
Look for unit tests, data model, high level classes, find something familiar, look at imports - are there packages the code is dependent upon
 +
Run unit tests
 +
Look for superclasses
 +
From package dependencies figure out classes and package structure
 +
 +
Ordering where to look:
 +
Find any technical documentation (like JavaDoc) - keep it open to refer back to
 +
Look for a folder called testing and look for unit tests - if none exists then search junit in imports
 +
What are the methods that are tested (hopefully there is documentation)? This identifies the core clases - these are classes of high interest
 +
Run the unit tests
 +
Find the high level classes in the data model and the interfaces (in a game, the sprites, weapons, actors, etc. put another example here)
 +
Use CodeCity and then X-Ray to visualize the code - what is most of the code dependent upon? Students should look at the code at the same time as they explore the visualization. This will help understand the class dependencies. (Ruby can expand on the criteria that can be used to visualize)
 +
Look at the import list to see if it is dependent upon other libraries
 +
Find the data model, how is the data saved, what data structures are used?
 +
JDeodorant could be used to help understand potential refactoring because it looks at bad part of the code
 +
  
  
 
=== Deliverables: ===
 
=== Deliverables: ===
 
What will the student hand in?
 
What will the student hand in?
 
+
Submit answers to quesitions and screen captures
 +
Give instances of each of the bad smells from JDeodorant
 +
Ultimate Goal: Make a code contribution back to the project with the enhancement.
  
 
=== Assessment: ===
 
=== Assessment: ===
Line 77: Line 117:
 
|'''Materials/Environment''' || What does the student need?  Internet access, IRC client, Git Hub account, LINUX machine, etc.?
 
|'''Materials/Environment''' || What does the student need?  Internet access, IRC client, Git Hub account, LINUX machine, etc.?
 
|-
 
|-
|'''Author''' || Who wrote this activity?  
+
|'''Author''' || Who wrote this activity? Ruby ElKharboutly, Josh Dehlinger, Ed Gehringer, Moshen Doroodchi, Lori Postner
 
|-
 
|-
 
|'''Source''' || Is there another activity on which this activity is based?  If so, please provide a link to the original resource.
 
|'''Source''' || Is there another activity on which this activity is based?  If so, please provide a link to the original resource.

Revision as of 22:19, 2 March 2016

Title Code Base understanding
Overview High level description of what the student will do Students will navigate a complex Java code base using a number of different techniques or strategies to understand the design and architecture.
Prerequisite Knowledge CS 2- Data structures in Java Learning Objectives What should the student be able to do after completing this activity?

The student should be able to: Follow specific strategies to understand the code Analyze the critical components of the code base Understand the importance of dependencies and coupling/decoupling Understand the importance of technical documentation in understanding the code Utilize visualization tools to navigate and understand complex codebase

Background:

Is there background reading material?

  • Josh will add*

Are there other activities the student should have done first?

  • Read technical documentation specific to the project (project installation, tools needed, APIs) - assumption is that the environment is already installed
  • Run the program, understand the behavior of it

Come up with an enhancement - provides the motivation for this activity


What is the rationale for this activity? Students cannot become contributors to HFOSS projects until they understand the code base. This activity provides a number of strategies to help students approach a new code base and make sense of it. It has starting points (such as looking at unit testing) and more advanced techniques (such as using visualization tools to understand dependencies).

Include helpful hints to faculty here. Visualization tools for Java: Code City: https://marketplace.eclipse.org/content/codecity X-Ray: https://marketplace.eclipse.org/content/x-ray-software-visualization JDeodorant https://marketplace.eclipse.org/content/jdeodorant

This activity is designed for Eclipse. Suggestion: have students work in groups

Potential Problems in this activity: code base changes may not find what you are looking for - it may not contain unit tests, etc.

Directions:

What should the student do? Look for unit tests, data model, high level classes, find something familiar, look at imports - are there packages the code is dependent upon Run unit tests Look for superclasses From package dependencies figure out classes and package structure

Ordering where to look: Find any technical documentation (like JavaDoc) - keep it open to refer back to Look for a folder called testing and look for unit tests - if none exists then search junit in imports What are the methods that are tested (hopefully there is documentation)? This identifies the core clases - these are classes of high interest Run the unit tests Find the high level classes in the data model and the interfaces (in a game, the sprites, weapons, actors, etc. put another example here) Use CodeCity and then X-Ray to visualize the code - what is most of the code dependent upon? Students should look at the code at the same time as they explore the visualization. This will help understand the class dependencies. (Ruby can expand on the criteria that can be used to visualize) Look at the import list to see if it is dependent upon other librariew Find the data model, how is the data saved, what data structures are used? JDeodorant could be used to help understand potential refactoring because it looks at bad part of the code


Deliverables:

What will the student hand in? Submit answers to quesitions and screen captures Give instances of each of the bad smells from JDeodorant Ultimate Goal: Make a code contribution back to the project with the enhancement.

Assessment:

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

Comments:

What should the instructor know before using this activity?

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 - https://www.acm.org/education/CS2013-final-report.pdf
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 Who wrote this activity? Ruby ElKharboutly, Josh Dehlinger, Ed Gehringer, Moshen Doroodchi, Lori Postner
Source Is there another activity on which this activity is based? If so, please provide a link to the original resource.
License Under which license is this material made available? (http://creativecommons.org/licenses/)

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-ShareAlike 4.0 International License

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