[Solved] CS3700 Homework1-a client and a server programs

Part I: Write a client program and a server program to implement the following protocol on top of UDP.

• Client Program:
  1. Display a message to ask the User to input the DNS or IP of the machine on which the Server Program runs.
  2. Display the following table on the standard output:

Item ID Item Description

00001 New Inspiron 15

00002 New Inspiron 17

00003 New Inspiron 15R

00004 New Inspiron 15z Ultrabook

00005 XPS 14 Ultrabook

00006 New XPS 12 UltrabookXPS

3. Display a message on the standard output to ask the User to input an Item ID, and validate the user input. If the input is not a valid Item ID, ask the User to re-type it.
4. Once getting a valid item ID from the User, send a request including this Item ID (e.g., 00005 or 00005) to the Server program to ask for a quote, and record the local time right before sending such request.
5. Receive and interpret the response from the Server program, get the local time right after such response is received, and display the following information on the standard output, (e.g., if 00005 were provided by the User earlier on)

Item ID Item Description Unit Price Inventory RTT of Query

00005 XPS 14 Ultrabook $999.99 261 ms where RTT of Query is the difference between the time in Steps 5 and 4 in millisecond.

6. Display a message on the standard output to ask the User whether to continue. If yes, repeat steps 2 through 5. Otherwise, close the socket and terminate the Client program.

• Server Program:
  1. Maintain the following information using an appropriate data structure of your choice (i.e., an array of a Class you defined).

You do not have to place it in a file although you certainly can if you like.

Item ID Item Description Unit Price Inventory

00001 New Inspiron 15 $379.99 157

00002 New Inspiron 17 $449.99 128

00003 New Inspiron 15R $549.99 202

00004 New Inspiron 15z Ultrabook $749.99 315

00005 XPS 14 Ultrabook $999.99 261

00006 New XPS 12 UltrabookXPS $1199.99 178

2. Wait for receiving a packet from a Client.
3. Once a packet is received from a Client, retrieve the information relevant to the requested Item ID from the data structure you used in Step 1 and send back such information to the Client.
4. Repeat Steps 2 and 3 infinitely until an exception is caught.
5. Close the datagram socket.

Part II : Test your programs on the Virtual Servers in the cloud and your laptop/home computer.

Warning: to complete this part, especially when you work at home, you must first (1) connect to GlobalProtect using your NetID account (please read how to connect to GlobalProtect at https://msudenver.edu/vpn/); then (2) connect to the virtual servers cs3700a and cs3700b using sftp and ssh command on MAC/Linux or PUTTY and PSFTP on Windows.

1. MAKE a directory HW02 under your home directory on cs3700a.msdenver.edu and cs3700b.msudenver.edu, a subdirectory server under HW02 on msudenver.edu, and a subdirectory client under HW02 on cs3700b.msudenver.edu.
2. UPLOAD and COMPILE the server program under HW02/server and the client program under HW02/client on the VMs.
3. TEST the server program running on cs3700a.msudenver.edu together with a client program running on your laptop or lab computer and another client program, simultaneously, running on cs3700b.msudenver.edu to test all the possible cases.
4. SAVE a file named txt under HW02/client on cs3700b.msudenver.edu, which captures the outputs of your client program when you test it. You can use the following command to redirect the standard output (stdout) and the standard error

(stderr) to a file on UNIX, Linux, or Mac, and view the contents of the file

java prog_name_args | tee testResultsClient.txt //copy stdout to the .txt file cat file-name //display the files contents.