qr code crystal reports 2008 FUNCTIONAL ROLES in Font

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CHAPTER 10 FUNCTIONAL ROLES
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Late Binder
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SW1 Position Signal Pin
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Figure 10-40. Showing the Binder that operates a switch The signals that control the switch can come from any objects in the system. The switch table in Figure 10-40 shows that when the Binder receives the signal N1, the switch position is set to pin 1, so the signal entering the switch through pin A exits through pin 1. When the Binder receives signal N2, the switch position is set to pin 2. Figure 10-41 shows a diagram that includes two objects (C4 and C5) that fire events that control the late Binder.
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Late Binder
Figure 10-41. A complete diagram, showing a switch, a late Binder, and its control signals The notification signals N1 and N2 control the late-binding process. The Binder would use the following statements to initially wire C1 to C2: C# c1.OnX += new C1.EventX(c2.DoThis); VB .NET AddHandler c1.OnX, AddressOf c2.DoThis In order for a late Binder to remove old wiring, the Binder sometimes must know about that wiring. How wiring is represented at the implementation level is language-specific. In C# and VB .NET, wires are just references to methods and are implemented using .NET delegates. In Java, wires are Method objects that reference a method. Note that .NET delegates support multicasting. To remove an old binding, you can t simply use the = operator to overwrite the old delegate with a new one, because doing so would remove all the
CHAPTER 10 FUNCTIONAL ROLES
handlers installed for that event, while the intention was only to remove one of the handlers. To remove a specific handler, you must know which delegate you want to remove and use the -= operator to remove it, like this: C# c1.OnX -= delegateToRemove VB .NET RemoveHandler c1.OnX, delegateToRemove Getting back to the example in Figure 10-41, to switch signal X from C2 to C3, the Binder must first remove the wiring between C1 and C2, and then add new wiring between C1 and C3. Listing 10-30 and Listing 10-31 show how the Binder might be implemented in C# and VB .NET. Listing 10-30. A C# Implementation of the Late Binder public class LateBinder { Builder builder; C1.UniversalHandler c2Wiring, c3Wiring; public LateBinder(Builder theBuilder) { builder = theBuilder; } private void RemoveOldWiring() { if (c2Wiring != null) builder.c1.OnX -= c2Wiring; if (c3Wiring != null) builder.c1.OnX -= c3Wiring; } public void SwitchXToC2() { RemoveOldWiring(); // add new path if (c2Wiring == null) c2Wiring = new C1.UniversalHandler(builder.c2.DoThis); builder.c1.OnX += c2Wiring; } public void SwitchXToC3() { RemoveOldWiring(); // add new path if (c3Wiring == null) c3Wiring = new C1.UniversalHandler(builder.c3.DoThat); builder.c1.OnX += c3Wiring; } }
CHAPTER 10 FUNCTIONAL ROLES
Listing 10-31. A VB .NET Implementation of the Late Binder Public Class LateBinder Private _builder As Builder Private c2Wiring, c3Wiring As C1.UniversalHandler Public Sub New(ByVal theBuilder As Builder) _builder = theBuilder End Sub Private Sub RemoveOldWiring() If Not c2Wiring Is Nothing Then RemoveHandler _builder._c1.OnX, c2Wiring End If If Not c3Wiring Is Nothing Then RemoveHandler _builder._c1.OnX, c3Wiring End If End Sub Public Sub SwitchXToC2() RemoveOldWiring() ' add new path If c2Wiring Is Nothing Then c2Wiring = AddressOf _builder._c2.DoThis End If AddHandler _builder._c1.OnX, c2Wiring End Sub Public Sub SwitchXToC3() RemoveOldWiring() ' add new path If c3Wiring Is Nothing Then c3Wiring = AddressOf _builder._c3.DoThat End If AddHandler _builder._c1.OnX, c3Wiring End Sub End Class The code assumes that C1.UniversalHandler is a delegate defined in C1 like this: C# public delegate void UniversalHandler(); VB .NET Public Delegate Sub UniversalHandler() This Binder example uses a break before make (BBM) algorithm to switch the X signal: It breaks the old connection between c1 and c2 before making a new one from c1 to c3. The alternative to BBM is make before break (MBB), in which the new connection is made before removing the old one. The difference between BBM and MBB may seem academic, but it can be very important in asynchronous systems, if C1 can fire event X while the Binder is in the process of changing the binding.
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