Question

Objective Practice creating use-case and sequence diagrams. . Mini case study: a computer email system Consider a computer email system with the following actors: user, server, and virus checker A. (3 points) Explain the relevance of each actor, in brief. B. (4 points) The computer email system has some use-cases; one of them is to “get an email.” List four additional use cases at a comparable level of abstraction. Summarize the purpose of each use case with a sentence. C. (5 points) Prepare a use case diagram for a computer email system using Violet. Save you diagram as <COE528_Lab_4.ucase.violet>. (Do not export the diagram to an image file.) D. (3 points) Prepare a scenario for the use case, “get an email.” Remember that a scenario is an example and need not exercise all functionality of the use case. You can use bullet points. E. (5 points) Prepare a sequence diagram corresponding to the scenario in (d). Save you diagram as <COE528_Lab_4.seq.violet>. (Do not export the diagram to an image file.) For this lab, you will create a text file named COE528_Lab_4.txt and add your answer for A, B, and D into it.

Answer 1

Computer Email System:

A.)Relevance of Each Actor:

USER:

1. Logs in to the email account with email-id and password.
2. Checks the emails.
3. Responds to the email.
4. Sends New Email.
5. Sends the unsent emails in draft.
6. Manages the account profile.
7. Deletes emails.
8. Searches Old emails.
9. Changes account password.
10. Logs out of email account.
11. Organizes email.
12. Customizes settings such as the backgroud,theme.

SERVER:

1. Computerized mailman.
2. Receives email from client computers .
3. Delivers email over the network.
4. Comprises a Database of user accounts.
5. Sends e-mail using SMTP.
6. Receives e-mail using POP,IMAP.

VIRUS CHECKER:

1. Protectes against viruses,malware,spam and other cyber threats.
2. Helps blocking email-borne threats.
3. Prevents malicious items from downloading.
4. Detects and fix viruses.
5. Enhances easy-to-use interface.
6. Enhances Detection and Cleanup

B.)Additional Four use cases and their purpose with a sentence.

Additional Four Actors for the computer email system with their usecases.

1. Administrator: Manages Mail accounts.
2. Sender : Sends an Email.
3. Receiver : Receives an Email/Gets an email
4. New User : Creates an Email account.

​​​​​​​D.)Use Case Diagram for a scenario "Get an email".

Logs in with email ed and password Composes a User1, Message with an Sender) attachment Countory A Sends the message (email Server Receres the emait to deliver to the corresponding (Country A) server. Sends the client computease (email to the corresponding) soewen. Usor 2 (Reciver Server ccountry. Country ß) Receines the email from seriver e Country A) Bends the email to the eeruesponding receipient Receives the email (Reply the email of required Varus checker Enhances Detection and cleanup

E.)Sequence Diagram .
Sequence Usera Csepetar) Receiver ser 1 (Sender) Diagram Serveri C Country AY Server 2 Virus checker q (Country B) or I hogins and Compose a message client computers email recured by senve 1 Sends the chentcomputers email to Seavera from email recited corresponding Server and sent to the receiven Tusen 2. Replys to User a Received ail the enhances detection and cleanup.