Skip to main content

Identifying interactions











[Time 5:50 mins]


In this section we will identify collaborations among the classes as they enact each use case. In this phase we may discover new classes that we had not thought of earlier, as well as new responsibilities for existing classes. We may also discard some initial classes. The process of determining the collaborations as each use case is enacted helps in refining and validating the design.


CUSTOMER DETERMINES THE PRICE OF A GROUP OF ITEMS:

  1. Customer enters item codes at the UserTerminal
  2. UserTerminal creates Item objects for each item and finds out their individual prices
  3. The UserTerminal finds out all the schemes these items belong to
  4. The UserTerminal determines the Scheme price of all items belonging to a Scheme and adds the individual price of the remaining items
  5. The UserTerminal displays all the above information to the Customer

 

CUSTOMER CHECKS OUT ITEMS:

  1. Customer takes items to the checkout system
  2. Checkout assistant adds item codes in the CheckoutSystem
  3. Checkout system determines the price of all the items, taking into account discounts and schemes
  4. Checkout system generates a bill for the customer
  5. Checkout system accepts the customers payment

 

STOREMANAGER DETERMINES THE SHOP INVENTORY VALUATION

  1. The StoreManager uses the ControlPanel to get inventory vauation
  2. The ControlPanel uses the CurrentStock to get the valuation
  3. The CurrentStock object determines the price of every individual item and the price of items and represents it as the maximum price in the PriceRange
  4. The CurrentStock determines the minimum price by associating items into schemes and assuming that they are sold such
  5. The CurrentStock returns the PriceRange object back to the ControlPanel which displays the details to the StoreManager

New classes identified:

  • UserTerminal
  • CheckoutSystem
  • PriceCalculator
  • ControlPanel
  • PriceRange


Note: This post was originally posted on my blog at http://www.adaptivelearningonline.net
Labels:

Comments

Post a Comment

Popular posts from this blog

Running your own one person company

Recently there was a post on PuneTech on mom's re-entering the IT work force after a break. Two of the biggest concerns mentioned were : Coping with vast advances (changes) in the IT landscape Balancing work and family responsibilities Since I have been running a one person company for a good amount of time, I suggested that as an option. In this post I will discuss various aspects of running a one person company. Advantages: You have full control of your time. You can choose to spend as much or as little time as you would like. There is also a good chance that you will be able to decide when you want to spend that time. You get to work on something that you enjoy doing. Tremendous work satisfaction. You have the option of working from home. Disadvantages: It can take a little while for the work to get set, so you may not be able to see revenues for some time. It takes a huge amount of discipline to work without a boss, and without deadlines. You will not get the benefits (insuranc...
10 comments
Read more

Testing Groovy domain classes

If you are trying to test Grails domain class constraints by putting your unit test cases in the 'test/unit' directory, then your tests will fail because the domain objects will not have the 'valdate' method. This can be resolved in two ways: Place the test cases inside test/integration (which will slow things down) Use the method 'mockForConstraintsTests(Trail)' to create mock method in your domain class and continue writing your test cases in 'test/unit' What follows is some example code around this finding. I am working on a Groovy on Grails project for a website to help programmers keep up and refresh their skills. I started with some domain classes and then moved on to write some unit tests. When we create a Grails project using grails create-app , it creates several directories, one of which is a directory called 'test' for holding unit tests. This directory contains two directories, 'unit', and 'integration' for unit and ...
11 comments
Read more

My first impressions of Python for the second time

I had worked a bit in Python many years back. Since then I have forgotten almost everything I learned back then. I think the phrase "Out of sight out of mind" applies perfectly to my mind. Since the last few days, I have started relearning Python, and this time I am recording my impressions of Python after having come to it from a Java background. Indentation: Python uses indentation to specify blocks of code, instead of curly braces. I like this, because we anyways indent code to increase readability, so why not achieve two tasks together. Code looks much cleaner without the curly braces. However there may be a little downside. Everyone in the team will have to set up their IDE's in the same way. Things might fall apart if some people use tabs and others use spaces for indentation. Access modifiers: Python does not have public, private, and protected keywords. Everything is public. However, private members can be specified with a leading single underscore. If we use do...
6 comments
Read more