Description
1 Problem definition
The goal of this (and the next project) is to implement a Twitter-like engine and (in
part 2) pair up with Web Sockets to provide full functionality.
Specific things you have to do are:
In part I, implement the following functionalities:
1. Register account and delete account
2. Send tweet. Tweets can have hashtags (e.g. #COP5615isgreat) and mentions
(@bestuser). You can use predefines categories of messages for hashtags.
3. Subscribe to user’s tweets.
4. Re-tweets (so that your subscribers get an interesting tweet you got by other
means).
5. Allow querying tweets subscribed to, tweets with specific hashtags, tweets in
which the user is mentioned (my mentions).
6. If the user is connected, deliver the above types of tweets live (without querying).
Other considerations:
The client part (send/receive tweets) and the engine (distribute tweets) have to be
in separate processes. Preferably, you use multiple independent client processes
that simulate thousands of clients and a single-engine process.
1. You need to measure various aspects of your simulator and report performance.
2. Write test cases using the elixir’s built-in ExUnit test framework verifying the
correctness for each task. Specifically, you need to write unit tests and functional
tests (simple scenarios in which a tweet is sent, the user is mentioned or retweets). Write 2-3 tests for each functionality.
When you submit the project, make sure you include a README that explains what
functionality is implemented, how to run the tests, etc. You need to submit a report
with performance analysis.
2 Requirements
Input: The input provided (as command line to your program will be of the form:
mix run proj4 num_user num_msg
Where num_user is the number of actors you have to create and num_msg is
the number of tweets a user has to make.
We can check for project using test cases that you will make. You don’t have to
print certain output. You can print whatever you want.
Make sure your test cases run using mix test.
Actor modeling: In this project you have to use exclusively the actor facility
(GenServer) in Elixir (projects that do not use multiple actors or use any other form
of parallelism will receive no credit).
README File: In the README file you have to include the following material:
– Team members
– What is working
– Mention all Functionalities that you implemented
– Mention all the test cases that you created
3 BONUS
For bonus1. Simulate periods of live connection and disconnection for users.
2. Simulate a Zipf distribution on the number of subscribers. For accounts with a lot
of subscribers, increase the number of tweets. Make some of these messages’
re-tweets.
You can also implement some extra functionalities that you want to implement.
Write a Report-bonus.pdf to explain your functionalities and submit project4-
bonus.zip with your code.
For Project 4.2, implement a web interface using phoenix and capture various
metrics and send them via Phoenix to the browser.
More Project 4.2 details will be posted soon.
