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Modeling skills, in particular class modeling and physical data modeling System System classes provide operating-system-specific functionality for your applications, isolating your software from the operating system OS by wrapping OS-specific features, increasing the portability of your application.
Analysis skills to identify what needs to be built Architectural and design skills to determine how to implement the classes Modeling skills, in particular class modelingsequence diagrammingand state modeling Collaboration within a layer is allowed.
Collaboration can also occur between layers connected by arrows. As you see in Figure 1interface classes may send messages to domain classes but not to persistence classes. Domain classes may send messages to persistence classes, but not to interface classes.
By restricting the flow of messages to only one direction, you dramatically increase the portability of your system by reducing the coupling between classes.
All types of classes may interact with system classes. This is because your system layer implements fundamental software features such as inter-process communication IPCa service classes use to collaborate with classes on other computers, and audit logging, which classes use to record critical actions taken by the software.
For example, if your user interface classes are running on a personal computer PC and your domain classes are running on an EJB application server on another machine, and then your interface classes will send messages to the domain classes via the IPC service in the system layer.
This service is often implemented via the use of middleware. The important thing is that you identify the layers that are pertinent to your environment and then act accordingly.
Source I originally wrote about the class type architecture in Building Object Applications That Worka Jolt-productivity award winner, but have updated the concept since.
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