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The final step in the object design process is to compare the new class diagram with the original use case descriptions to ensure that everything described in each use case can be accomplished through the use of these objects. Doing so helps to ensure that the object model covers all the user requirements. Figure 3-11 shows the complete object model, and Table 3-3 shows the updated CRC information. The solid-lined arrows in Figure 3-11 indicate collaboration between objects, illustrating how many of them work together to provide the required functionality. The dashed lines show navigation between objects. For instance, if you have a ProjectInfo object, it is possible to navigate from there to a Project, typically by calling a GetProject() method. While navigation between objects isn t strictly necessary, it is often of great benefit to UI developers. Consider that a UI developer will get access to a ProjectInfo object when the user selects a project from a control in the UI. In most cases, the next step is to load the associated Project so that the user can view or edit the data. Providing navigational support directly in the object model makes this trivial to implement within the UI.
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Figure 3-11. Final Project Tracker object model
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Table 3-3. Final List of Objects and Their Responsibilities
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Potential Class
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Project ProjectResources ProjectResource Resource ResourceAssignments ResourceAssignment Assignment ProjectList ProjectInfo ResourceList
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Responsibility
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Adds and edits a valid project Maintains a list of resources assigned to a project Manages assignment of a resource to a project Adds and edits a valid resource Maintains a list of projects to which a resource is assigned Manages a project to which a resource is assigned Manages association of a project and a resource Gets a read-only list of projects Provides read-only information for a project Gets a read-only list of resources
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Collaborators
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ProjectResources, CommonRules ProjectResource Assignment, CommonRules, Resource ResourceAssignments, CommonRules ResourceAssignment Assignment, CommonRules, Project RoleList ProjectInfo Project ResourceInfo
CH APT ER 3 O BJECT -O RIEN TED A PPLI CA TI O N D ESI GN
Table 3-3. Final List of Objects and Their Responsibilities (Continued)
Potential Class
ResourceInfo RoleList Roles Role
Responsibility
Provides read-only information for a resource Gets a read-only list of roles Maintains a list of roles in the system Adds and edits a valid role
Collaborators
Resource None Role, RoleList None
If you review the use cases, you should find that the objects can be used to accomplish all of the tasks and processes described in the following list: Users can get a list of projects. Users can add a project. Users can edit a project. Users can remove a project. Users can get a list of resources. Users can add a resource. Users can edit a resource. Users can remove a resource. Users can assign a resource to a project (and vice versa). When a resource is assigned to a project, users can specify the role the resource will play on the project.
Custom Authentication
Though the objects required to service the business problem have been designed, there s one area left to address. For this application, I want to show how to use custom authentication. Perhaps this requirement became clear due to a user requirement to support users external to our organization: users that aren t in our corporate domain or Active Directory (AD). The topic of authentication has been discussed several times in the book thus far, and you should remember that CSLA .NET supports Windows integrated (AD) authentication in fact, that s the default. But it also supports custom authentication, allowing the business developer to create custom .NET principal and identity objects that authenticate the user using credentials stored in a database, LDAP server, or other location. To this end, the object model will include two objects: PTPrincipal and PTIdentity. They are shown in Figure 3-12.
Figure 3-12. The PTPrincipal and PTIdentity objects
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PTPrincipal is a .NET principal object and acts as the primary entry point for custom authentication and role-based authorization. PTIdentity is a .NET identity object and is responsible for representing the user s identity. At this point, the object model can be considered complete.
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