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As discussed earlier, if there are common business rules or logic for properties exposed in such read-only objects, the common behaviors should be normalized into another object.
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Figure 6-8 shows the two collection objects with their corresponding read-only child objects.
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Figure 6-8. The read-only collection objects, ProjectList and ResourceList
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CHAPTER 6 s OBJECT-ORIENTED APPLICATION DESIGN
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The ProjectInfo object is responsible for providing read-only information about a project, while the ResourceInfo object provides read-only information about a resource. By loading the minimum amount of data required to meet these responsibilities, these objects provide a high performance solution and follow good behavioral object design.
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Inter-Object Collaboration
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The object model has a RoleList object, responsible for providing a read-only list of role data. It also has a Roles object, responsible for editing the list of roles in the application. While these two objects have very distinct responsibilities, they do have a point of interaction that should be addressed. Though not required by any use case from a user, the RoleList object can, and probably should, be cached. The list of roles won t change terribly often, and yet the RoleList object will be used frequently to populate UI controls and to validate data from the user. There s no sense hitting the database every time to get the same data over and over. You ll see how to easily implement the caching in 8, but first, there s a design issue to consider: what happens when the user edits the list of roles using the Roles object In such a case, the RoleList object will be inaccurate.
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There s a related issue too, which is when another user edits the list of roles. That issue is harder to solve, and requires either periodic cache expiration or some mechanism by which the database can notify the client that the roles have changed. Solving this problem is outside the scope of this discussion.
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It is relatively trivial to have the Roles object notify RoleList to tell it that the data has changed. In such a case, RoleList can simply invalidate its cache so the data is reloaded on the next request. Again, the implementation of this behavior is shown in 8. From an object model perspective, however, this means that there is interaction between Roles and RoleList. From a CRC perspective, this means that Roles collaborates with RoleList to expire the cache when appropriate.
Reviewing the Design
The final step in the object design process is to compare the new class diagram with the original use case descriptions in order 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. The complete object model is shown in Figure 6-9, with the updated CRC information shown in Table 6-3. The solid-lined arrows in Figure 6-9 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.
CHAPTER 6 s OBJECT-ORIENTED APPLICATION DESIGN
Figure 6-9. Final project tracker object model
Table 6-3. Final List of Objects and Their Responsibilities
Potential Class
Project ProjectResources ProjectResource Resource ResourceAssignments ResourceAssignment Assignment ProjectList ProjectInfo ResourceList ResourceInfo RoleList Roles Role
Responsibility
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 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
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