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Subject Code: P8MCAE1. Elective – I – 1- OOAD and UML Ali Bahrami, “Object Oriented Systems Development” Irwin-McGraw Hill,. New Delhi, International. Object oriented systems development / Ali Bahrami. This book provides a comprehensive treatment of the entire system life cycle using object-oriented. Methodologies Discussion on few Examples of OOAD Application Scenarios Ali Bahrami, Object Oriented System Development, Tata McGraw-Hill, 2.
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Collaboration diagrams represent a combination of information taken from class, sequence, and use case diagrams describing both the static structure and dynamic behavior of a system. An Activity diagram generally does not model ooad ali bahrami exact internal behaviour of a software ooad ali bahrami like a sequence diagram does but ooad ali bahrami it shows the general processes and pathways at a high level.
Often it is used to model business activities such as Selling Books or Manage Inventoryand may be at a very high level. Standard UML notation uses a rectangle with rounded corners to depict an Activity. Activities may be joined by process flows or events. In addition, a Decision node can model divergent behaviour based on a condition.
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Typically a Start and End node are defined to complete the full Activity representation. Synchronization points may also ooad ali bahrami defined to illustrate how processing may be carried out in parallel, then synchronized at a point before further activity is undertaken.
The rounded rectangles are Activities, the diamonds are Decision points and the horizontal black bars ooad ali bahrami synchronization points.
A class is a specification - an object an instance of ooad ali bahrami class. Classes may be inherited from other classes that is they inherit all the behaviour and state of their parent and add new functionality of their ownhave other classes as attributes, delegate responsibilities to other classes and implement abstract interfaces.
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The Class Model is at the core of object-oriented development and design - it expresses both the persistent state of the system and the behaviour of the system. A class encapsulates state attributes and offers services to manipulate that state behaviour.
Good object-oriented design limits direct access to class attributes and offers services, which manipulate attributes on behalf of the caller. This hiding of data and exposing of services ensures data ooad ali bahrami are only done ooad ali bahrami one place and according to specific rules - for large systems the maintenance burden of code which has direct access to data elements in many places is extremely high.
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The class is represented as Figure 3. Example of a class diagram 3. In a two-layered system, user interface screens are tied to the data through routines that ooad ali bahrami directly behind the screens; for example, a routine that executes when you click on a button.
With every interface you create, you must re-create the business logic needed to ooad ali bahrami the screen. The routines required to access the data must exist within every screen. Any change to the business logic must be accomplished in every screen that deals with that portion of the business.
This approach results in objects that are very specialized and cannot be reused easily in other projects. A better approach to systems architecture is one ooad ali bahrami isolates the functions of the interface from the functions of the business. This approach also isolates the business from the details of the data access.
Using the three layered approach, you are able to create objects that represent tangible elements of your business yet are completely independent of how they are represented to the user through an interface or how they are physically stored in a database.
Object Oriented Systems Development
The three-layered approach consists of a view or user-interface layer, a business layer, and an access layer. Most modern object-oriented analysis and design ooad ali bahrami are generated toward identifying these kinds of objects.
The responsibilities of the business layers are very straightforward: