Java Fundamentals - Homework 13

Description

Implement a simple chat client-server application.

Run the tests to verify your solution.

Requirements

1. The client has been written for you, you need to write the server
2. The server must be able to handle multiple connected clients
3. Whenever a client connects to the server, it first sends its name, the server must keep track of the names
4. Whenever the server receives a message from a client, it must prefix the message with the name of the client and send this prefixed message to all other connected clients
5. The server must also send X has joined and X has left messages to all clients
   • a client joins when he connects, and leaves when he disconnects
6. The server must have an HTTP endpoint (on port 8080) that returns the names of all currently connected clients
   • just a basic list, one name per line
   • return an empty line ("\n") if there are 0 clients
   • use Jetty
7. The server must be thread-safe
8. Resources must be properly closed and released (i.e. nothing should be referencing them so that they could be garbage collected)
9. Tests must pass
10. You are allowed to use only the standard Java library + Jetty

Various tips

If you still want to build the application without fixing the tests, then you can do that by skipping them in the build by adding -DskipTests to the command:

./mvnw clean package -DskipTests

Client sample output

Enter name:
chip
Connecting...
Connected, you can type your messages now
dale has joined
hey dale
dale: hi
let's go get some apples
dale: sure, why not
dale: let's meet at your place, I'll be there in 10
dale has left
/q

Submitting your assignment

For your convenience, we have set up the Maven project to ZIP up all files in your project folder so it is easy for you to attach it to an e-mail and send it our way. All you need to do is to execute the following command in your project folder:

./mvnw clean deploy

It will ask you for your full name, Student Book Number (also known as matrikli number) and a comment (optional).

Example:

./mvnw clean deploy

#...skipping building, testing and packaging output from Maven...

[INFO] --- maven-antrun-plugin:1.8:run (package homework ZIP) @ homework13 ---
[INFO] Executing tasks

main:
Your full name (e.g. John Smith):
Jane Smith
Your Student Book Number (matrikli number, e.g. B12345):
B12345
Comment:
Java IO
      [zip] Building zip: /Users/jane/workspace/jf-hw-net/target/jf-homework13-B12345.zip
   [delete] Deleting: /Users/jane/workspace/jf-hw-net/homework.properties
[INFO] Executed tasks
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 20.041 s
[INFO] Finished at: 2017-02-03T11:35:11+02:00
[INFO] Final Memory: 21M/283M
[INFO] ------------------------------------------------------------------------

After Maven has finished, you can find the generated ZIP file in target folder with name such as jf-homework13-B12345.zip (it contains your Student Book Number/matrikli number and homework number).

The only thing left to do now is to send the ZIP file as an attachment to an e-mail with subject "Homework 13 - your Student Book Number/maktrikli number" to [email protected].