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LifecycleCoordinator
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4. 7. BuildBasicUi 11. BuildRemainderOfApp BuildInfrastructure
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builderBinder_OnProgressChanged builderBinder_OnProgressTextChanged
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5, 12 ProgressChanged 14. ProgressTextChanged
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Show Update Hide UpdateProgress
3. 10. 6.
FormMain
FormMain
Show Update UpdateProgress StatusBarMessage
9. 13. 15.
RunCoordinator
RunCoordinator
16. Run formMain_Closing 18. Exiting 17. Closing
ShutDownSystem
ShutdownCoordinator
ShutdownCoordinator
19. Run
Figure 10-24. The wiring diagram of the system The wiring diagram shows numbered signals, but given the number of signals involved, a sequence diagram is more suited for describing the signal chronology, as shown in Figure 10-25.
CHAPTER 10 FUNCTIONAL ROLES
LifecycleCoordinator Run()
StartupCoordinator Show() Update()
FormSplash
FormMain
BuilderBinder
BuildInfrastructure() ProgressChanged() UpdateProgress()
BuildBasicUi() Show() Update() Hide()
BuildRemainderOfApp() ProgressChanged() UpdateProgress() ProgressTextChanged() StatusBarMessage()
RunCoordinator Run() Exiting() Closing()
ShutdownCoordinator Run() Hide()
Figure 10-25. The system s sequence diagram StartupCoordinator controls the BuilderBinder using transparent interactions with pushed feedback. The call to BuilderBinder.BuildInfrastructure results in one or more ProgressChanged feedback notifications. The call to BuilderBinder.BuildRemainderOfApp is similar, but results in two kinds of feedback notifications: one with a completion percentage value (ProgressChanged) and one with an update message (ProgressTextChanged). The two forms FormMain and FormSplash can be considered workers, whose mission during the initialization phase is to display text and progress feedback. FormMain has the additional task of hosting the main UI elements, such as a menu, a toolbar, and a content area. The example uses a BuilderBinder to create instances of all the top-level objects. The purpose of a builder is to centralize
CHAPTER 10 FUNCTIONAL ROLES
the instantiation of important objects, keeping references to all the objects they build in order to prevent them from being garbage-collected. I cover builders and binders in more detail in the next sections. In many systems, you can load the infrastructure in a background thread. The infrastructure includes the non-UI-related plumbing. When threading is involved, it is StartupCoordinator s job to spawn the background thread and call BuilderBinder.BuildInfrastructure on it. When the Builder fires progress updates, it is again StartupCoordinator s job to switch to the UI thread before sending the updates to the splash or main forms. In my sample code, StartupCoordinator uses Control. Invoke in builderBinder_OnProgressChanged and builderBinder_OnProgressTextChanged to achieve the proper thread switching before invoking methods of FormSplash and FormMain. The RunCoordinator class shown doesn t do much, but in a real application it might contain a significant amount of code to handle events from Worker objects. In my code, RunCoordinator just handles FormMain s Closing event by notifying the LifecycleCoordinator to initiate the shutdown sequence. I kept this sequence to a minimum, but in many systems you might need to clean up and dispose of resources or update persistent settings for the next run.
Builders
Before introducing builders, let me digress slightly and look again at the life cycle of an EBS. No matter what the system s size and domain are, you must perform the following tasks at run time. Create a series of objects. Wire the objects together. Use the objects. Destroy the objects. You generally can t use an EBS until you ve instantiated and wired together at least some of its objects in some fashion. These first two steps are problematic from the coupling perspective, because an object containing the creation and wiring logic is coupled to the classes it instantiates and wires. If the instantiation relies on constructor calls (e.g., the new keyword in languages such as C# and Java), type coupling will occur, which is static in nature. If the instantiation and wiring rely on reflection, logic coupling will occur, which is dynamic in nature. As an example, assume a system has two components C1 and C2, and that C1 contains a Worker class T1 that instantiates, using a constructor call, a Worker class T2 contained in C2. The system will have the coupling diagram shown in Figure 10-26.
C1 T1
Instantiates Using a Constructor Call
static
Figure 10-26. Instantiation through constructor calls introduces type coupling. As shown in the diagram, C1 has unambiguous type coupling to C2. You can t compile, link, test, or deploy C1 without C2. To remove the coupling between C1 and C2, you need to remove the requirement
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