Homework 4 – Bulletin Board System: Pub/Sub system Solution

Command format

Description

Result

subscribe –board <board-name>

Subscribe the board with a keyword,

Success

Subscribe successfully

–keyword <keyword>

notify the client whenever the event be

(The notify message should

(command and arguments are in the

raised.

at least include board, title,

same line)

Note [1]: Can subscribe the same

and author)

board multiple times with different

Fail (1)

Please login first

keywords. Notify user once someone

Fail (2)

[Invalid option] usage:

creates a new post with a specified

subscribe –board <board-

board and the title contains one of the

name> –keyword

keywords

<keyword>

Note [2]: Subscribe objective (board)

Fail (3)

Already subscribed

can be nonexistent

subscribe –author <author-name>

Subscribe the author with a keyword,

Success

same as the previous one

–keyword <keyword>

notify the client whenever the event be

Fail (1)

same as the previous one

(command and arguments are in the

raised.

Fail (2)

[Invalid option] usage:

same line)

subscribe –author <author-

Both notes [1] and [2] are same as the

name> –keyword

previous one (change objective to

<keyword>

author) ↑

Fail (3)

same as the previous one

unsubscribe –board <board-name>

Unsubscribe the board from the server

Success

Unsubscribe successfully

(or middleware server) and remove all

Fail (1)

Please login first

the keywords associated with a specified

Fail (2)

You haven’t subscribed

board.

<board-name>

unsubscribe –author <author-name>

Unsubscribe the author from the server

Success

Unsubscribe successfully

(or middleware server) and remove all

Fail (1)

Please login first

the keywords associated with a

Fail (2)

You haven’t subscribed

specified author.

<author-name>

list-sub

List the information about the

Success

List all the subscribed info

subscribed board(s) and author(s).

Fail (1)

Please login first

Client 1

Client 2

Client 3

bash$ ./client 127.0.0.1 7777

bash$ ./client 127.0.0.1 7777

bash$ ./client 127.0.0.1 7777

********************************

********************************

********************************

** Welcome to the BBS server. **

** Welcome to the BBS server. **

** Welcome to the BBS server. **

********************************

********************************

********************************

% register Paul paul@cs.nctu.edu.tw 12345

% register Brad brad@cs.nctu.edu.tw 12345

% register Gary gary@cs.nctu.edu.tw 12345

Register successfully.

Register successfully.

Register successfully.

% login Paul 12345

% login Brad 12345

% login Gary 12345

Welcome, Paul.

Welcome, Brad.

Welcome, Gary.

% subscribe –board HW4_Board

% subscribe –author Jason –keyword hw4

–keyword Project

Subscribe successfully

Subscribe successfully

% create-board HW4_Board

Create board successfully.

% subscribe –board HW4_Board

% subscribe –author Paul –keyword HW

–keyword Project

Subscribe successfully

Already subscribed

% subscribe –author Paul –keyword post

% subscribe –author Bryant

Subscribe successfully

–keyword exam

% unsubscribe –author Brad

Subscribe successfully

You haven’t subscribed Brad

% create-post HW4_Board

–title About Project –content HW4…

Create post successfully.

% *[HW4_Board] About Project – by Paul*

% list-board ##HW

Index

Name

Moderator

1

HW4_Board

Paul

% create-post HW4_Board

% unsubscribe –author Bryant

–title About HW and Exam –content

Unsubscribe successfully

blablabla

Create post successfully.

% list-sub

% *[HW4_Board] About HW and Exam –

Board: HW4_Board: Project

by Paul*

% list-sub

Author: Jason: hw4; Paul: HW, post