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CHAPTER 10 FUNCTIONAL ROLES
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Public Class Builder Private Shared _singleton As Builder Shared ReadOnly Property Singleton() As Builder Get If _singleton Is Nothing Then _singleton = New Builder End If Return _singleton End Get End Property Public _formSplash As FormSplash Public _formMain As FormMain ' some arbitrary objects to build Public _worker1 As Worker1 Public _worker2 As Worker2 ' private constructor, to force access through Singleton property Private Sub New() _formSplash = New FormSplash End Sub Public Sub BuildInfrastructure() _worker1 = New Worker1 _worker2 = New Worker2 ' simulate a lengthy process System.Threading.Thread.Sleep(5000) End Sub Public Sub BuildUi() _formMain = New FormMain End Sub End Class The splash screen just contains static text. To detect the end of the background initialization, the Coordinator waits for the Builder thread to finish, using Thread.Join. An event notification could also have been used to signal the Builder s completion, as described in the example at the end of the Coordinators section. While the background Builder is busy, the Coordinator gets the main UI built on the main thread. Once the background Builder completes, the splash screen is removed and the main UI is shown. Note that the Builder is unaware that its BuildInfrastructure method runs on a background thread. The Builder knows nothing about threads. You could easily modify the design to run the Builder on the main thread, without needing to modify the Builder. The only class in the system that knows anything about the background thread is the Coordinator. Some systems may need to include progress feedback during the background build process, perhaps to show the name of each component being loaded, the amount of memory used, the amount of time remaining, and so on. To support progress feedback, the Coordinator can invoke the Builder using a transparent asynchronous interaction with pushed feedback. It s important to remember that the event handler in the Coordinator doesn t execute on the UI thread, but rather on a background thread. The event handler therefore needs to synchronize with the UI thread before updating the user feedback window. In the .NET world, you accomplish the synchronization using the
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CHAPTER 10 FUNCTIONAL ROLES
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method System.Windows.Forms.Control.Invoke, as shown in the second example at the end of the Coordinators section.
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Just In Time (JIT) building, also known as lazy loading or late loading, is used in systems when a complete system initialization would take too long. Rather than build all the run-time objects at once, the idea is to build only those objects that are absolutely necessary to get the system up. All other objects are built just in time, when they are needed. You need to treat JIT Builders somewhat differently from ordinary builders. Unless you re careful, JIT Builders can introduce a lot of unnecessary coupling into the system. To see how coupling might creep in, assume you have a very simple system consisting of a Coordinator team with one coordinator and two subordinate workers. Since the workers are expected to take a long time to build and aren t needed immediately on startup, the system JIT-builds them. Figure 10-30 shows the Coordinator team.
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Coordinator Worker1 Worker2
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Figure 10-30. A Coordinator team that uses a JIT Builder Ideally, you want no coupling to occur between the Coordinator and workers. At initialization time, assume that only the Coordinator need be present, perhaps because it handles certain simple tasks without needing any workers. Say the Coordinator only needs the workers if you call the Coordinator.DoSomething method. To create the workers, the Coordinator needs to invoke the services of a JIT Builder. Since this Builder instantiates the two workers, it is also type-coupled to the Worker classes, as shown in the coupling diagram in Figure 10-31.
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