Component-Based Software Engineering: The Bank Example

Implement a simple banking application that allows customers of the bank to open and close accounts and deposit and withdraw a certain amount of money. Additionally, the bank should allow customers to buy and sell stock and to obtain price quotes of the stock to buy. It is only necessary to give customers the option to buy stock at the current price.

The data used by the application

• The customers that are clients at the bank. The bean has to store at least a customer id, it's name and address.
• The accounts that have been opened by customers. The record has to provide at least the following information: (account-id, account-name, balance)
• The ticker symbols of the companies whose stock can be bought and sold (e.g., IBM for IBM, MSFT for Microsoft or SUNW for Sun Microsystems) as well as the current price per share. The stock quote record has to provide at least the following information: (symbol, company-name, price)
• A portfolio table that indicates how many shares of a given company are owned by a specific account (customer). The record has to provide at least the following information: (account-id, symbol, quantity). Basically, this table has one relationship to the accounts and another one to the stock quote records.

The data above has the following relations:

• 1:n between customer and accounts. One customer may have several accounts. It is not necessary to implement the option that an account can be shared by multiple customers.
• 1:n between account and portfolio item. One account has multiple portfolio items.
• 1:n between ticker symbol and portfolio item. Different portfolio items may refer to the same company.

Ensure that you use at least one BMP and one CMP entity bean in the above implementations. Relationships should be handled using the mechanisms provided by EJB. Again use at least one container-managed relation and one bean-managed relation.

Accessing your bank application

For the communication between the entity beans use a session bean that provides all the banks functionality to customers. Make use of local interfaces and ejb references where appropriate. Ensure that only bank clearks can invoke the deposit and withdraw methods. Buying and selling stock may be performed by the respective account holders.

Any transaction management necessary may be handled using container managed transactions.

Updating stock prices

Implement a mechanism to update the stock-price bean implemented. This should be accomplished using a message driven bean that accepts messages containing a company tocker symbol and the current price quote. In order to generate JMS messages that are sent to your message driven bean, implement a small client that periodically checks a web service that publishes stock quote information over the JMS channel to which your bean is subscribed.

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More requirements will follow...

Thomas Gschwind