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Maintaining a List of Roles
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Resources are assigned to projects to fill a specific role. The list of possible roles needs to be maintainable by end users, specifically administrators.
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During conversations with users, we discovered that a number of them are highly technical and are already skeptical of our ability to create all the UI options they desire. They indicated high interest in having programmatic access to the database, or to our business objects. In other words, we have some power users who are used to programming in Access and know a bit of VBA, and they want to write their own reports and maybe their own data entry routines.
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This same scenario would play out if there were a requirement to provide access to the application to business partners, customers, vendors, or any external application outside our immediate control.
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CH APT ER 3 O BJECT -O RIEN TED A PPLI CA TI O N D ESI GN
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Obviously, there are serious issues with giving other people access to the application s database especially read-write access. Unless all the business logic is put into stored procedures, this sort of access can t be provided safely. Likewise, there are issues with providing direct access to the business objects. This is safer in some ways, because the objects implement the business logic and validation, but it s problematic from a maintenance perspective. If other people are writing code to interact directly with the business objects, then the objects can t be changed without breaking their code. Since the other people are outside of our control, it means that the Project Tracker application can never change its object model. Of course, this is totally unrealistic. It is a virtual guarantee that there will be future enhancements and requests for changes to the system, which will undoubtedly require changes to the business objects. Fortunately, XML services offer a clean solution. If XML services are treated just like any another interface (albeit a programmatic one) to the application, they can be used to easily provide access to the application without allowing external programs to interact directly with the application s database or business objects. In 21, I ll revisit these ideas, showing how to implement a set of XML services using WCF so that external applications can safely interact with the application in a loosely coupled manner.
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At this point, the key requirements for the application have been gathered from the use cases. Based on these use cases, it is possible to create an object-oriented design. There are a variety of techniques used in object-oriented design; you may have heard of Class Responsibility Collaborator (CRC) cards and decomposition, in addition to others. In this chapter, I ll use ideas from both decomposition and CRC cards. A form of decomposition will be used to identify the nouns in the use cases and then narrow down which of these are actual business objects. These objects will be described in terms of their CRC.
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Initial Design
The first step in the process, then, is to assemble a list of the nouns in the use case write-ups. By using a bit of judgment, you can eliminate a few nouns that are obviously not objects, but still end up with a good-sized list of potential business objects or entities, as shown in Table 3-1.
Table 3-1. Potential Entities Discovered in the Initial Design Project manager Project name Administrator Resource Supervisor List of roles List of resources Project Start date List of projects Employee name List of assignments Assignment List of assigned resources Project number End date Employee Employee ID Role Date assigned
C HA PTER 3 OBJEC T-ORIE NTED APPLIC ATION DES IGN
Using your understanding of the business domain (and probably through further discussion with business users and fellow designers), you can narrow the options. Some of these entities aren t objects, but rather data elements or security roles. These include the following: Project manager Administrators Supervisor
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