qr code crystal reports 2008 FUNCTIONAL ROLES in Font

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CHAPTER 10 FUNCTIONAL ROLES
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2. DoSomething 1. Run
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3. DoSomething
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7. NowDoThis
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9. Method2
8. Method1
Worker1
Worker2
Figure 10-57. An example of a system using a router The system consists of two major components, SubSystem1 and SubSystem2, with a router sitting between them. The Run command on SubSystem1 causes a flurry of activity, as shown in the diagram. Note that some of the objects, like C1, must be reentrant. When C1 fires the DoSomething event, the calls blocks until the event notification is processed. To process it, the Router forwards the notification to C2, which calls back through the Router into C1. To remove the reentrancy requirement, some of the events would have to be fired asynchronously. Listing 10-53 and Listing 10-54 show a C# and VB .NET implementation of the system. Listing 10-53. A C# Implementation of a System Using a Router public delegate void UniversalHandler(); public class Router { public void DoSomething() { FireDoSomething(); } public void NowDoThis() { FireNowDoThis(); } public event UniversalHandler OnDoSomething; void FireDoSomething() { if (OnDoSomething != null) OnDoSomething(); }
5. Method2
4. Method1
CHAPTER 10 FUNCTIONAL ROLES
public event UniversalHandler OnNowDoThis; void FireNowDoThis() { if (OnNowDoThis != null) OnNowDoThis(); } public event UniversalHandler OnMethod1; void FireMethod1() { if (OnMethod1 != null) OnMethod1(); } public event UniversalHandler OnMethod2; void FireMethod2() { if (OnMethod2 != null) OnMethod2(); } } public class Coordinator1 { public void Run() { FireDoSomething(); } public void NowDoThis() { FireMethod1(); FireMethod2(); } public event UniversalHandler OnDoSomething; void FireDoSomething() { if (OnDoSomething != null) OnDoSomething(); } public event UniversalHandler OnMethod1; void FireMethod1() { if (OnMethod1 != null) OnMethod1(); }
CHAPTER 10 FUNCTIONAL ROLES
public event UniversalHandler OnMethod2; void FireMethod2() { if (OnMethod2 != null) OnMethod2(); } } public class Coordinator2 { public void DoSomething() { FireMethod1(); FireMethod2(); FireNowDoThis(); } public event UniversalHandler OnNowDoThis; void FireNowDoThis() { if (OnNowDoThis != null) OnNowDoThis(); } public event UniversalHandler OnMethod1; void FireMethod1() { if (OnMethod1 != null) OnMethod1(); } public event UniversalHandler OnMethod2; void FireMethod2() { if (OnMethod2 != null) OnMethod2(); } } public class BuilderBinder { public Coordinator1 coordinator1; public Worker1 worker1; public Router router; public Coordinator2 coordinator2; public Worker2 worker2; public void Build() { coordinator1 = new Coordinator1(); worker1 = new Worker1(); router = new Router(); coordinator2 = new Coordinator2(); worker2 = new Worker2(); }
CHAPTER 10 FUNCTIONAL ROLES
public void Bind() { coordinator1.OnDoSomething += new UniversalHandler(router.DoSomething); coordinator1.OnMethod1 += new UniversalHandler(worker1.Method1); coordinator1.OnMethod2 += new UniversalHandler(worker1.Method2); router.OnDoSomething += new UniversalHandler(coordinator2.DoSomething); router.OnNowDoThis += new UniversalHandler(coordinator1.NowDoThis); coordinator2.OnNowDoThis += new UniversalHandler(router.NowDoThis); coordinator2.OnMethod1 += new UniversalHandler(worker2.Method1); coordinator2.OnMethod2 += new UniversalHandler(worker2.Method2); } } public class Worker1 { public void Method1() {/*..*/} public void Method2() {/*..*/} } public class Worker2 { public void Method1() {/*..*/} public void Method2() {/*..*/} } Listing 10-54. A VB .NET Implementation of a System Using a Router Public Delegate Sub UniversalHandler() Public Class Router Public Sub DoSomething() FireDoSomething() End Sub Public Sub NowDoThis() FireNowDoThis() End Sub Public Event OnDoSomething As UniversalHandler Sub FireDoSomething() RaiseEvent OnDoSomething() End Sub Public Event OnNowDoThis As UniversalHandler Sub FireNowDoThis() RaiseEvent OnNowDoThis() End Sub Public Event OnMethod1 As UniversalHandler Sub FireMethod1() RaiseEvent OnMethod1() End Sub
CHAPTER 10 FUNCTIONAL ROLES
Public Event OnMethod2 As UniversalHandler Sub FireMethod2() RaiseEvent OnMethod2() End Sub End Class Public Class Coordinator1 Public Sub Run() FireDoSomething() End Sub Public Sub NowDoThis() FireMethod1() FireMethod2() End Sub Public Event OnDoSomething As UniversalHandler Sub FireDoSomething() RaiseEvent OnDoSomething() End Sub Public Event OnMethod1 As UniversalHandler Sub FireMethod1() RaiseEvent OnMethod1() End Sub Public Event OnMethod2 As UniversalHandler Sub FireMethod2() RaiseEvent OnMethod2() End Sub End Class Public Class Coordinator2 Public Sub DoSomething() FireMethod1() FireMethod2() FireNowDoThis() End Sub Public Event OnNowDoThis As UniversalHandler Sub FireNowDoThis() RaiseEvent OnNowDoThis() End Sub Public Event OnMethod1 As UniversalHandler Sub FireMethod1() RaiseEvent OnMethod1() End Sub Public Event OnMethod2 As UniversalHandler Sub FireMethod2() RaiseEvent OnMethod2() End Sub End Class
CHAPTER 10 FUNCTIONAL ROLES
Public Class BuilderBinder Public _coordinator1 As Coordinator1 Public _worker1 As Worker1 Public _router As Router Public _coordinator2 As Coordinator2 Public _worker2 As Worker2 Public Sub Build() _coordinator1 = New Coordinator1 _worker1 = New Worker1 _router = New Router _coordinator2 = New Coordinator2 _worker2 = New Worker2 End Sub Public Sub Bind() AddHandler _coordinator1.OnDoSomething, AddressOf _router.DoSomething AddHandler _coordinator1.OnMethod1, AddressOf _worker1.Method1 AddHandler _coordinator1.OnMethod2, AddressOf _worker1.Method2 AddHandler _router.OnDoSomething, AddressOf _coordinator2.DoSomething AddHandler _router.OnNowDoThis, AddressOf _coordinator1.NowDoThis AddHandler _coordinator2.OnNowDoThis, AddressOf _router.NowDoThis AddHandler _coordinator2.OnMethod1, AddressOf _worker2.Method1 AddHandler _coordinator2.OnMethod2, AddressOf _worker2.Method2 End Sub End Class Public Class Worker1 Public Sub Method1() End Sub Public Sub Method2() End Sub End Class Public Class Worker2 Public Sub Method1() End Sub Public Sub Method2() End Sub End Class The Router implementation contains only inputs that are wired directly to outputs. Routers often have no other logic. If you opt to add logic to a Router, the logic should only be related to notification routing. For example, a Router serving as a bridge across a remote connection may use a high-speed connection by default, but fall back on an alternate and slower connection if problems arise with the fast connection.
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