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cs100-F2019-lab2-starter

Table of Contents

Introduction

Designed for use with GitHub Classroom and GatorGrader, this repository contains the starter for a laboratory assignment in an introductory computer science class that uses the Java programming language. The Travis CI builds for this repository will not pass, as evidenced by a red ✗ instead of a green ✔ appearing in the commit logs. An instructor would use this repository to create a "starter" repository with purposefully omitted features that a student would then need to add in order to achieve the stated learning objectives. Please bear in mind that much of the content in this document is written in its current form under the assumption that it will also accompany the "starter" repository that an instructor shares with a student through the use of GitHub Classroom.

This assignment requires a programmer to implement and test a Java program, called ComputeMoonDistance, that will produce four lines of output. The first line of output will contain the name of the programmer and the date at which the program was run. The next three lines will feature the output of numerical values, with the final line outputting the result of a computation with variables. As verified by Checkstyle, the source code for the ComputeMoonDistance.java file must adhere to all of the requirements given in the Google Java Style Guide.

The programmer completing this assignment is also responsible for writing a multiple-paragraph reflection, stored in the file writing/reflection.md, that explains the challenges that you faced and the solutions you developed. This is a Markdown file that should adhere to the standards described in the Markdown Syntax Guide. Remember, an individual completing this assignment can preview the contents of a comitted Markdown file by clicking on the name of the file in your GitHub repository. Don't forget that your writing/reflection.md file should adhere to the Markdown standards established by the Markdown linting tool and, optionally, the writing standards set by the Proselint tool.

The source code in the ComputeMoonDistance.java file must also pass additional tests set by the GatorGrader tool. For instance, GatorGrader will check to ensure that ComputeMoonDistance produces exactly four lines of output and that you correctly use the new Date() construct in the Java code. When you use the git commit command to transfer your source code to your GitHub repository, Travis CI will initialize a build of your assignment, checking to see if it meets all of the requirements. If both your source code and writing meet all of the established requirements, then you will see a green ✔ in the listing of commits in GitHub. If your submission does not meet the requirements, a red ✗ will appear instead. Please note that, at the option of the course instructor, some checks may be run in Travis CI that are not run locally by the GatorGrader tool. Finally, the instructor will reduce a programmer's grade for this assignment if the red ✗ appears on the last commit in GitHub immediately before the assignment's due date.

A carefully formatted assignment sheet for this project provides more details about the steps that a computer scientist should take to complete this assignment. You can view this assignment sheet by visiting the listing of laboratories on the course web site created by the course instructor. Please pay attention to the icons in the left-hand margin of the assignment sheet as they will help you to understand and remember what steps you should take at key parts of the assignment.

Continuous Learning

If you have not done so already, please read all of the relevant GitHub Guides that explain how to use many of the features that GitHub provides. In particular, please make sure that you have read the following GitHub guides: Mastering Markdown, Hello World, and Documenting Your Projects on GitHub. Each of these guides will help you to understand how to use both GitHub and GitHub Classroom.

Students who want to learn more about how to use Docker should review the Docker Documentation. Students are also encouraged to review the documentation for their text editor, which is available for text editors like Atom and VS Code. You should also review the Git documentation to learn more about how to use the Git command-line client. In addition to talking with the instructor and technical leader for your course, students are encouraged to search StackOverflow for answers to their technical questions.

To do well on this assignment, you should also read Chapters 1 and 2 in the course textbook, paying particularly close attention to Sections 1.4 and 1.5 and Sections 2.2 through 2.6. Please see the course instructor or one of the student technical leaders if you have questions about any of these reading assignments.

System Commands

This project invites students to enter system commands into a terminal window. This assignment uses Docker to deliver programs, such as gradle and the source code and packages needed to run GatorGrader, to a students' computer, thereby eliminating the need for a programmer to install them on their development workstation. Individuals who do not want to install Docker can optionally install of the programs mentioned in the Project Requirements section of this document.

Using Docker

Once you have installed Docker Desktop, you can use the following docker run command to start gradle grade as a containerized application, using the DockaGator Docker image available on DockerHub.

docker run --rm --name dockagator \
  -v "$(pwd)":/project \
  -v "$HOME/.dockagator":/root/.local/share \
  gatoreducator/dockagator

The aforementioned command will use "$(pwd)" (i.e., the current directory) as the project directory and "$HOME/.dockagator" as the cached GatorGrader directory. Please note that both of these directories must exist, although only the project directory must contain something. Generally, the project directory should contain the source code and technical writing of this assignment, as provided to a student through GitHub. Additionally, the cache directory should not contain anything other than directories and programs created by DockaGator, thus ensuring that they are not otherwise overwritten during the completion of the assignment. To ensure that the previous command will work correctly, you should create the cache directory by running the command mkdir $HOME/.dockagator. If the above docker run command does not work correctly on the Windows operating system, you may need to instead run the following command to work around limitations in the terminal window:

docker run --rm --name dockagator \
  -v "$(pwd):/project" \
  -v "$HOME/.dockagator:/root/.local/share" \
  gatoreducator/dockagator

Please bear in mind that certain terminal emulators on the Windows operating system may require you to substitute $(pwd) for the directory that contains the source code for this assignment and $HOME for the home directory in which you keep all of your files. Students who cannot get these Docker commands to work on their laptop should talk with the course instructor or a student technical leader.

Here are some additional commands that you may need to run when using Docker:

  • docker info: display information about how Docker runs on your workstation
  • docker images: show the Docker images installed on your workstation
  • docker container list: list the active images running on your workstation
  • docker system prune: remove many types of "dangling" components from your workstation
  • docker image prune: remove all "dangling" docker images from your workstation
  • docker stop: stop a specified docker container from your workstation
  • docker container prune: remove all stopped docker containers from your workstation
  • docker rmi $(docker images -q) --force: remove all docker images from your workstation

Using Gradle

Since the above docker run command uses a Docker images that, by default, runs gradle grade and then exits the Docker container, you may want to instead run the following command so that you enter an "interactive terminal" that will allow you to repeatedly run commands within the Docker container.

docker run -it --rm --name dockagator \
  -v "$(pwd)":/project \
  -v "$HOME/.dockagator":/root/.local/share \
  gatoreducator/dockagator /bin/bash

Once you have typed this command, you can use the GatorGrader tool in the Docker container by typing the command gradle grade in your terminal. Running this command will produce a lot of output that you should carefully inspect. If GatorGrader's output shows that there are no mistakes in the assignment, then your source code and writing are passing all of the automated baseline checks. However, if the output indicates that there are mistakes, then you will need to understand what they are and then try to fix them.

You can also complete several important Java programming tasks by using the gradle tool. For instance, you can compile (i.e., create bytecode from the program's source code if it is correct) the program using the command gradle build. Here are some other commands that you can type:

  • gradle grade: run the GatorGrader tool to check your work
  • gradle clean: clean the project of all the derived files
  • gradle check: check the quality of the code using Checkstyle
  • gradle build: create the bytecode from the Java source code
  • gradle run: run the Java program in the command-line
  • gradle tasks: display details about the Gradle system

To run one of these commands, you must be in the main (i.e., "home base") directory for this assignment where the build.gradle file is located.

Expected Program Output

Typing the command gradle run in the terminal window should produce the following output for the completed version of ComputeMoonDistance. As long as your program adheres to all of the requirements for the assignment and passes all of the verification checks, your version should produce similar output. With that said, program output may vary according to, for instance, the name of the programmer and the date on which you ran the program.

> Configure project :
Configured GatorGradle 0.4.4

> Task :run
Gregory M. Kapfhammer Tue Sep 17 10:14:21 EDT 2019
Distance to the moon in miles: 238855
Number of miles in a yard: 1760
Number of yards to the moon is: 420384800

BUILD SUCCESSFUL in 891ms
2 actionable tasks: 1 executed, 1 up-to-date

Running the command gradle -q --console plain run will suppress the display of Gradle's diagnostic information and produce output like the following.

Gregory M. Kapfhammer Tue Sep 17 10:14:56 EDT 2019
Distance to the moon in miles: 238855
Number of miles in a yard: 1760
Number of yards to the moon is: 420384800

Automated Checks with GatorGrader

In addition to meeting all of the requirements outlined in the assignment sheet, your submission must pass the following checks that GatorGrader automatically assesses:

  • Repository has at least 5 commit(s)
  • The ComputeMoonDistance.java in src/main/java/labtwo has at least 2 multiple-line Java comment(s)
  • The ComputeMoonDistance.java in src/main/java/labtwo has at least 2 single-line Java comment(s)
  • The ComputeMoonDistance.java in src/main/java/labtwo has exactly 0 of the Add Your Name Here fragment
  • The ComputeMoonDistance.java in src/main/java/labtwo has exactly 0 of the TODO fragment
  • The ComputeMoonDistance.java in src/main/java/labtwo has exactly 1 of the import java.util.Date fragment
  • The ComputeMoonDistance.java in src/main/java/labtwo has exactly 1 of the new Date() fragment
  • The ComputeMoonDistance.java in src/main/java/labtwo has exactly 1 of the package labtwo; fragment
  • The ComputeMoonDistance.java in src/main/java/labtwo has exactly 3 match(es) of the int (\\w)+ regular expression
  • The ComputeMoonDistance.java in src/main/java/labtwo has exactly 4 of the println( fragment
  • The command gradle -q --console plain run executes correctly
  • The command gradle build executes correctly
  • The command output has exactly 1 of the 1760 fragment
  • The command output has exactly 1 of the 238855 fragment
  • The command output has exactly 1 of the 420384800 fragment
  • The command output has exactly 4 lines
  • The file ComputeMoonDistance.java exists in the src/main/java/labtwo directory
  • The file reflection.md exists in the writing directory
  • The reflection.md in writing has at least 300 word(s) in total
  • The reflection.md in writing has exactly 0 of the Add Your Name Here fragment
  • The reflection.md in writing has exactly 1 of the code_block tag
  • The reflection.md in writing has exactly 1 of the list tag
  • The reflection.md in writing has exactly 6 of the heading tag
  • The reflection.md in writing has exactly 7 of the code tag

If GatorGrader's automated checks pass correctly, the tool will produce the output like the following in addition to returning a zero exit code (which you can access by typing the command echo $?).

        ┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
        ┃ Passed 24/24 (100%) of checks for cs100-F2019-lab2! ┃
        ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛

Downloading Project Updates

If GatorGrader's maintainers push updates to this assignment and you received it through GitHub Classroom and you would like to also receive these updates, then you can type this command in the main directory for this assignment:

git remote add download [email protected]:Allegheny-Computer-Science-100-F2019/cs100-F2019-lab2-starter/

You should only need to type this command once; running the command additional times may yield an error message but will not negatively influence the state of your Git repository. Now, you are ready to download the updates provided by the assignment's maintainers by typing this command:

git pull download master

This second command can be run whenever the maintainers needs to provide you with new source code for this assignment. However, please note that, if you have edited the files that we updated, running the previous command may lead to Git merge conflicts. If this happens, you may need to manually resolve them with the help of the instructor or a student technical leader. Finally, please note that the Gradle plugin for GatorGrader will automatically download the newest version of GatorGrader.

Using Travis CI

This assignment uses Travis CI to automatically run GatorGrader and additional checking programs every time you commit to your GitHub repository. The checking will start as soon as you have accepted the assignment — thus creating your own private repository — and the course instructor and/or GitHub enables Travis for it. If you are using Travis for the first time, you will need to authorize Travis CI to access the private repositories that you created on GitHub. If you do not see either a yellow ● or a green ✔ or a red ✗ in your listing of commits, then please ask the instructor to see whether or not Travis CI was correctly enabled.

System Requirements

We developed this assignment to work with the following software and versions:

  • Docker Desktop
  • Operating Systems
    • Linux
    • MacOS
    • Windows 10 Pro
    • Windows 10 Enterprise
  • Programming Language Tools
    • Gradle 5.4
    • MDL 0.5.0
    • OpenJDK 11.0.4
    • Proselint 0.10.2
    • Python 3.6 or 3.7

Reporting Problems

If you have found a problem with this assignment's provided source code or documentation, then you can go to the Computer Science 100 Fall 2019 Lab 2 repository and raise an issue. If you have found a problem with the GatorGrader tool and the way that it checks your assignment, then you can also raise an issue in that repository. To ensure that your issue is properly resolved, please provide as many details as is possible about the problem that you experienced. If you discover a problem with the assignment sheet for this project, then please raise an issue in the GitHub repository that provides the assignment sheets for your course.

Whenever possible, individuals who find, and use the appropriate GitHub issue tracker to correctly document, a mistake in any aspect of this assignment will receive free GitHub stickers and extra credit towards their grade for the project.

Receiving Assistance

If you are having trouble completing any part of this project, then please talk with either the course instructor or a student technical leader during the course session. Alternatively, you may ask questions in the Slack workspace for this course. Finally, you can schedule a meeting during the course instructor's office hours.

Project Assessment

Taking inspiration from the principles of specification-based grading, the grade that a student receives on this assignment will have the following components:

  • Percentage of Correct GatorGrader Checks: Students are encouraged to repeatedly try to implement a Java program that passes all of GatorGrader's checks by, for instance, creating a program that produces the correct output. Students should also repeatedly revise their technical writing to ensure that it also passes all of GatorGrader's checks about, for instance, the length of its content and its appropriate use of Markdown.

  • Travis CI Build Status: Since additional checks on the source code and/or technical writing may be encoded in Travis CI's actions and, moreover, all of the GatorGrader checks are also run in Travis CI, students will receive a checkmark grade if their last before-the-deadline build passes and a green ✔ appears in their GitHub commit log instead of a red ✗. As with the previous grading component, students are encouraged to repeatedly revise their source code and technical writing in an attempt to get their Travis CI build to pass.

  • Mastery of Technical Writing: Students will also receive a checkmark grade when the responses to the technical writing questions presented in the writing/reflection.md reveal a mastery of both writing skills and technical knowledge. To receive a checkmark grade, the submitted writing should have correct spelling, grammar, and punctuation in addition to following the rules of Markdown and providing technically accurate answers. Students are encouraged to ask the course instructor or a student technical leader to use the GitHub issue tracker to provide feedback on their mastery of technical writing skills.

  • Mastery of Technical Knowledge and Skills: Students will also receive a checkmark grade when their GitHub repository reveals that they have mastered all of the technical knowledge and skills developed during the completion of this project. As a part of this grade, the instructor will assess aspects of the project including, but not limited to, the use of effective source code comments and Git commit messages. Students are encouraged to ask the course instructor or a student technical leader to use the GitHub issue tracker to provide feedback on how well their work demonstrates mastery of the assignment's technical knowledge and skills.

All grades for this project will be reported through a student's GitHub repository using either messages in the GitHub commit log or issues raised in the issue tracker. Students should ask questions about their grade for this project in GitHub so as to facilitate an effective conversation about the submitted deliverables.