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System::Console::WriteLine("Global target"); return true; } ref class SampleTargetType { internal: bool TargetMethod(int i) { System::Console::WriteLine("Non-static target "); return false; } }; int main() { SampleDelegate^ d1 = gcnew SampleDelegate(&GlobalTargetFunction); SampleTargetType^ targetObj = gcnew SampleTargetType(); SampleDelegate^ d2 = gcnew SampleDelegate(targetObj, &SampleTargetType::TargetMethod); // } Depending on the target function, the syntax for the delegate creation is different. For the global function, there is no object to invoke. Therefore, only the function pointer is passed as a constructor argument. For a non-static method, you have to pass a handle to the target object as well as a pointer the target function. For the invocation of a delegate, a special syntax is used, too. As Figure 5-8 shows, the delegate type SampleDelegate has a method called Invoke with the same signature as the delegate itself. This method actually calls the delegate target. Instead of calling Invoke directly on the delegate, an alternative language syntax adapted from the syntax for function pointer invocations is preferred: bool res = d1(10); bool res2 = d2->Invoke(10); // possible in VC2005, but not recommended ... delegate invocation discussed next ...

Sometimes, an application may need an object that provides data in a read-only fashion. For a readonly list of data, there s ReadOnlyListBase; however, if the requirement is for a single object containing read-only data, it should inherit from ReadOnlyBase. This is one of the simplest types of objects to create, since it does nothing more than retrieve and return data, as shown here: <Serializable()> _ Public Class ReadOnlyRoot Inherits ReadOnlyBase(Of ReadOnlyRoot) #Region "Business Methods" ' TODO: add your own fields, properties and methods ' example with managed backing field Private Shared IdProperty As PropertyInfo(Of Integer) = _ RegisterProperty(New PropertyInfo(Of Integer)("Id", "Id")) Public ReadOnly Property Id() As Integer Get Return GetProperty(IdProperty) End Get End Property ' example with private backing field Private Shared NameProperty As PropertyInfo(Of String) = _ RegisterProperty(New PropertyInfo(Of String)("Name", "Name"))

With this arrangement, you can lose a web server with minimal impact. Obviously, users in the middle of having a page processed on that particular server will be affected, but all other users should be redirected to the remaining live servers transparently. All the users Session data will remain available. As with the out-of-process option discussed previously, the Session object is serialized so that it can be transferred to the state server machine efficiently. This means that all objects referenced by Session are also serialized which isn t a problem for CSLA .NET style business objects, since they re marked as <Serializable()>.

Private _name As String = NameProperty.DefaultValue Public ReadOnly Property Name() As String Get Return GetProperty(NameProperty, _name) End Get End Property #End Region #Region "Authorization Rules" Protected Overrides Sub AddAuthorizationRules() ' TODO: add authorization rules 'AuthorizationRules.AllowRead("Name", "Role") End Sub Private Shared Sub AddObjectAuthorizationRules() ' TODO: add authorization rules 'AuthorizationRules.AllowGet(GetType(ReadOnlyRoot), "Role") End Sub #End Region #Region "Factory Methods" Public Shared Function GetReadOnlyRoot(ByVal id As Integer) As ReadOnlyRoot Return DataPortal.Fetch(Of ReadOnlyRoot)( _ New SingleCriteria(Of ReadOnlyRoot, Integer)(id)) End Function Private Sub New() ' require use of factory methods End Sub #End Region #Region "Data Access" Private Sub DataPortal_Fetch(ByVal criteria _ As SingleCriteria(Of ReadOnlyRoot, Integer)) ' TODO: load values End Sub #End Region End Class Like other business objects, a read-only object will have either managed or private fields that contain its data. Typically, it will also have read-only properties or methods that allow client code to retrieve values. As long as they don t change the state of the object, these may even be calculated values. The AddAuthorizationRules() method only needs to add roles for read access, since no properties should be implemented to allow altering of data. Similarly, the AddObjectAuthorizationRules() method only needs to define the roles allowed to get the object. In the Factory Methods region, there s just one factory method that retrieves the object by calling DataPortal.Fetch(). The Data Access region just contains DataPortal_Fetch(). Of course, there s no need to support updating or deleting a read-only object. As with the editable root stereotype, you can use the ObjectFactory attribute to have the data portal invoke a Fetch() method from an object factory rather than invoke the DataPortal_Fetch() method in the business class directly.

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