Develop a class diagram for the system

Assignment Help Computer Engineering

Reference no: EM131390067

PROBLEM 1:

A system keeps track of prices of machine parts in a warehouse. Prices of machine parts in the warehouse may change. Interested users may register with the system to watch price changes of a specific machine part in the warehouse. Each machine part is uniquely identified by its name and ID number. At any time different types of users may register or un-register to watch the price of a specific machine part in the warehouse. Each time when the price of a machine part changes, the system notifies all users registered to watch the price change of this machine part.

a. Develop a class diagram for the system using the Observer design pattern. For each class list all operations with parameters and briefly specify them using pseudo-code. In addition, for each class provide its attributes. Make the necessary assumptions for your design. Notice that the components in your design should be de-coupled as much as possible. In addition, components should have high cohesion.

b. Provide two sequence diagrams showing:

How the user registers to observe a price change of a selected machine part.
How the system notifies users about price change of a specific machine part.

PROBLEM 2:

The ACCOUNT component supports the following operations:

OPEN (int p, int y, int a) // open an account where p is a pin, y is an user's identification #, and a is a balance

PIN (int x) // provides pin #

DEPOSIT (int d); // deposit amount d

WITHDRAW (int w); // withdraw amount w

BALANCE (); // display the current balance

LOGOUT() // logout from the account

suspend() // suspends an account

activate() // activates a suspended account

close() // an account is closed

The ACCOUNT component is a state-based component and supports three types of transactions: withdrawal, deposit, and balance inquiry. Before any transaction can be performed, operation OPEN(p, y, a) must be issued, where y is a client's identification #, p is a pin used to get permission to perform transactions and a is an initial balance in the account. It is assumed that OPEN() operation is issued only once for a given account. Before any transaction can be performed, operation LOGIN(y) must be issued (where y is a client's identification #) followed by PIN(x) operation. The PIN(x) operation must contain the valid pin # that must be the same as the pin # provided in OPEN(p, y, a) operation. There is a limit on the number of attempts with an invalid pin. The account can be overdrawn. If the account is overdrawn then the withdrawal transaction cannot be performed. The account may become suspended by suspend() operation. If the account is suspended, withdrawal, deposit, and logout transactions cannot be performed. A suspended account can be activated by activate() operation. In addition, a suspended account can be closed by close() operation. The detailed behavior of the ACCOUNT component is specified using EFSM. The EFSM of Figure 1 shows the detail behavior of the ACCOUNT component.

Design the system using the State design pattern. Provide two solutions:

de-centralized version of the State pattern
centralized version of the State pattern

Notice that the components in your design should be de-coupled as much as possible. In addition, components should have high cohesion.

For each solution:

a. Provide a class diagram for the system. For each class list all operations with parameters and specify them using pseudo-code. In addition, for each class provide its attributes and data structures. Make the necessary assumptions for your design.

b. Provide a sequence diagram for the following operation sequence: OPEN(123,111,1000), LOGIN(111), PIN(123), DEPOSIT(200), BALANCE(), suspend(), close()

Attachment:- Assignment Files.rar

Reference no: EM131390067

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Reviews

len1390067

2/10/2017 5:50:35 AM

This is the Software Systems Architectures homework. We need to write the pseudo-code and draw some diagrams such as class diagram and several design patterns. I will provide the HW deatil pdf that you can see what we need to do for the HW. Also, I will provide the last year HW pdf and solutions from my other classmate that you can reference to know how to write this time HW. I will upload two rar files. One is last year HW, and the other is this year HW, the one we need to do this year which detail and request is on the pdf. The problem you need to do is that write this year hw only for #problem 2. You should use state pattern to provide two solutions: de-centralized version of the State pattern and centralized version of the State pattern. For each solution you should provide class diagrams and pseudo-code. And provide the sequence diagrams for the hw requirements. You can see this year homework 1.pdf for more detail.

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