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Public Event OnS3() Sub FireS3() RaiseEvent OnS3() End Sub End Class Public Class C2 Private _w2 As New W2 Public Sub HandleEvent(ByVal theEvent As EventDispatcher.Event) _w2.HandleEvent(theEvent) FireS3() End Sub Public Event OnS3() Sub FireS3() RaiseEvent OnS3() End Sub End Class Public Class C3 Private _w3 As New W3 Public Sub HandleEvent(ByVal theEvent As EventDispatcher.Event) _w3.HandleEvent(theEvent) FireS1() End Sub Public Event OnS1() Sub FireS1() RaiseEvent OnS1() End Sub End Class Note that the Fire method in EventHandler uses a local copy of the delegate variable to fire events. The copy protects the subscriber list during event firing, because the coordinators change the subscriber list while handling notifications. The coordinators first call W1, W2, or W3 to handle the event, and then the coordinators fire events to the late Binder to change the switch position, putting the system into the proper next state. The three coordinators create the worker instances directly, introducing static coupling between the coordinators and the workers. To create a completely decoupled state machine infrastructure, the coordinators could be changed to interact with the workers by firing events instead of making direct method calls.
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Just as builders can be smart, so can binders, because there are situations in which a binder may need to bind objects depending on run-time conditions. Take the example given when discussing smart builders: a two-tier distributed system, in which the client is connected to the server tier via the Internet. The system has two different UIs: A rich UI, used when a fast connection to the server is available A plain UI, used when only the slower backup connection is available
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If a fast connection is available, you ll need to build and bind the constituents of a rich UI; otherwise, you ll fall back on the plain UI. Listing 10-38 and Listing 10-39 show how a smart Binder might be implemented in C# and VB .NET. Listing 10-38. A Simple C# Smart Binder public class SmartBinder { Builder builder; public SmartBinder(Builder theBuilder) { builder = theBuilder; } public void Bind(bool isFastConnectionAvailable) { if (isFastConnectionAvailable) builder.w1.OnE1 += new W1.UniversalHandler(builder.w2.DoThis); else builder.w1.OnE1 += new W1.UniversalHandler(builder. w2.DoThat); } } Listing 10-39. A Simple VB .NET Smart Binder Public Class SmartBinder Private _builder As Builder Public Sub New(ByVal theBuilder As Builder) _builder = theBuilder End Sub Public Sub Bind(ByVal isFastConnectionAvailable As Boolean) If isFastConnectionAvailable Then AddHandler _builder._w1.OnE1, AddressOf _builder._w2.DoThis Else AddHandler _builder._w1.OnE1, AddressOf _builder._w2.DoThat End If End Sub End Class In the example, binding is controlled through a Boolean parameter passed to the Bind method. The Binder wires an event E1 of a class W1 to one of two possible destinations. The logic controlling binding should be as simple as possible, because the purpose of a Binder is to bind. If there is a substantial amount of logic required to control the binding, you should put that logic elsewhere: in a worker or coordinator.
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JIT Binders are used with objects created by a JIT Builder. As with JIT Builders, JIT Binders are called into action by notifications. The typical use of JIT building and binding is with coordinators that use JIT workers, created on the fly when certain operations are requested, as shown in Figure 10-46.
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2. BuildWorker 1. DoSomething
Coordinator
3. BindWorker
JitBinder
4. M1
Worker
Figure 10-46. Using event notifications to activate a JIT Binder In this example, the Coordinator uses a Worker that is created on the fly, when the DoSomething signal is received. The Coordinator fires an event first to the JIT Builder to create the Worker, then to a JIT Binder to wire the Worker to the Coordinator. Once the two are connected, the Coordinator can fire the M1 signal to the Worker. Figure 10-47 shows the coupling diagram for the system.
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