As part of homework assignment you will gain experience with creating and managing your Git repository, obtaining an open-source cloud simulation infrastructure Java project from a public Git repo, creating JUnit tests, and creating your SBT build and run

computer science


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Homework 1





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Homework 1

Description: create cloud simulators for evaluating executions of applications in cloud datacenters with different characteristics and deployment models.

Grade: 7% + bonus up to 3%

You can obtain this Git repo using the command git clone git clone You can clone Cloud2Sim or ingest it directly into IntelliJ from


As part of homework assignment you will gain experience with creating and managing your Git repository, obtaining an open-source cloud simulation infrastructure Java project from a public Git repo, creating JUnit tests, and creating your SBT build and run scripts for your simulation application. Doing this homework is essential for successful completion of the rest of this course, since all other homeworks and the course project will share the same features of this homework: branching, merging, committing, pushing your code into your Git repo, creating test cases and build scripts, and using various tools for diagnosing problems with virtual machines and your applications.

First things first, you must create your account at BitBucket, a Git repo management system. It is imperative that you use your UIC email account that has the extension Once you create an account with your UIC address, BibBucket will assign you an academic status that allows you to create private repos. Bitbucket users with free accounts cannot create private repos, which are essential for submitting your homeworks and the course project. Your instructor created a team for this class named cs441_Fall2019. Please contact your TA, Mr. Mohammed Siddiq using your UIC.EDU email account and he will add you to the team repo as developers, since Mr.Siddiq already has the admin privileges. Please use your emails from the class registration roster to add you to the team and you will receive an invitation from BitBucket to join the team. Since it is a large class, please use your UIC email address for communications or Piazza and avoid emails from other accounts like If you don't receive a response within 12 hours, please contact us via Piazza, it may be a case that your direct emails went to the spam folder.

Next, if you haven't done so, you will install IntelliJ with your academic license, the JDK, the Scala runtime and the IntelliJ Scala plugin, the Simple Build Toolkit (SBT) or the Gradle build tool and make sure that you can create, compile, and run Java and Scala programs. Please make sure that you can run various Java tools from your chosen JDK.

In this and all consecutive homeworks and in the course project you will use logging and configuration management frameworks. You will comment your code extensively and supply logging statements at different logging levels (e.g., TRACE, INFO, ERROR) to record information at some salient points in the executions of your programs. All input and configuration variables must be supplied through configuration files -- hardcoding these values in the source code is prohibited and will be punished by taking a large percentage of points from your total grade! You are expected to use Logback and SLFL4J for logging and Typesafe Conguration Library for managing configuration files. These and other libraries should be imported into your project using your script build.sbt or gradle script. These libraries and frameworks are widely used in the industry, so learning them is the time well spent to improve your resumes.

Even though Cloud2Sim is written in Java, you can create your simulations using Scala, for which you will receive an additional bonus of up to 3% for fully pure functional (not imperative) implementation. Since being proficient in Java is a prerequisite for this course, you will be expected to learn Scala as you go. As you see from the StackOverflow survey, knowledge of Scala is highly paid and in great demand, and it is expected that you pick it relatively fast, especially since it is tightly integrated with Java. I recommend using the book on Programming in Scala: Updated for Scala 2.12 published on May 10, 2016 by Martin Odersky and Lex Spoon. You can obtain this book using the academic subscription on Safari Books Online. There are many other books and resources available on the Internet to learn Scala. Those who know more about functional programming can use the book on Functional Programming in Scala published on Sep 14, 2014 by Paul Chiusano and Runar Bjarnason.

To receive your bonus for writing your cloud simulation program code in Scala, you should avoid using vars and while/for loops that iterate over collections using induction variables. Instead, you should learn to use collection methods map, flatMap, foreach, filter and many others with lambda functions, which make your code linear and easy to understand. Also, avoid mutable variables at all cost. Points will be deducted for having many vars and inductive variable loops without explanation why mutation is needed in your code - you can always do without it.

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