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The context dictionaries I discuss here do not replace Session in ASP.NET. These context values are available only for the lifetime of a single server call. If you want to store values across pages or server calls, you should use Session.
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I ll use the ClientContext to illustrate the solution. The context dictionary will be stored in either HttpContext or thread-local storage, based on the environment within which the code is running.
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C HAPTE R 6 BUSINES S FRAM EWORK IMPLEMENTA TION
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And because this code may run in a multithreaded environment, it must employ locking to ensure thread safety. First, there s the Public property that exposes the value: Private Shared _syncClientContext As New Object() Private Const _clientContextName As String = "Csla.ClientContext" Public Shared ReadOnly Property ClientContext() As ContextDictionary Get SyncLock _syncClientContext Dim ctx As ContextDictionary = GetClientContext() If ctx Is Nothing Then ctx = New ContextDictionary() SetClientContext(ctx) End If Return ctx End SyncLock End Get End Property When ClientContext is accessed, a lock is used to ensure thread safety. Within that lock, the GetClientContext() method is called to retrieve the context dictionary from its storage location: Friend Shared Function GetClientContext() As ContextDictionary If HttpContext.Current Is Nothing Then If ApplicationContext.ExecutionLocation = ExecutionLocations.Client Then SyncLock _syncClientContext Return DirectCast(AppDomain.CurrentDomain.GetData(_clientContextName), _ ContextDictionary) End SyncLock Else Dim slot As LocalDataStoreSlot = Thread.GetNamedDataSlot(_clientContextName) Return DirectCast(Thread.GetData(slot), ContextDictionary) End If Else Return DirectCast(HttpContext.Current.Items(_clientContextName), _ ContextDictionary) End If End Function This method detects whether the code is running in ASP.NET and retrieves the dictionary from HttpContext or thread-local storage as appropriate. If the dictionary does not yet exist, it is created and then stored using the SetClientContext() method: Private Shared Sub SetClientContext(ByVal clientContext As ContextDictionary) If HttpContext.Current Is Nothing Then If ApplicationContext.ExecutionLocation = ExecutionLocations.Client Then SyncLock _syncClientContext AppDomain.CurrentDomain.SetData(_clientContextName, clientContext) End SyncLock Else Dim slot As LocalDataStoreSlot = Thread.GetNamedDataSlot(_clientContextName) Thread.SetData(slot, clientContext) End If
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CHAPTER 6 BUS INE SS FRA MEWORK I MPLEME NTA T ION
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Else HttpContext.Current.Items(_clientContextName) = clientContext End If End Sub This method works much the same way, checking to see whether the code is running in ASP.NET and storing the value in the correct location. Notice that GetClientContext() uses Friend scope. This is because it is invoked not only from the LocalContext property but also from the data portal. The ClientContext and GlobalContext values flow to and from the client and server through the data portal. 15 provides more details about the data portal. At this point, you should have an understanding about how the ApplicationContext class provides access to application context values to the rest of the application.
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The BusinessBase(Of T) class exposes most of the functionality for a single editable object and combines support for data binding, validation rules, authorization rules, and n-level undo. I discuss each of these feature areas in s 7 through 16. Like all base classes, this class must be Serializable and MustInherit. Much of its behavior flows from its base classes or from other objects it contains. Here is the declaration of the class: Namespace Csla <Serializable()> _ Public MustInherit Class BusinessBase(Of T As BusinessBase(Of T)) Inherits Core.BusinessBase Implements Core.ISavable End Class End Namespace The generic type T is constrained to be the type of business object being created, so a business class is declared like this: <Serializable()> _ Public Class CustomerEdit Inherits BusinessBase(Of CustomerEdit) End Class The BusinessBase(Of T) class inherits from Csla.Core.BusinessBase, where most of the implementation resides. The reason for this is that BusinessBase(Of T) is generic and thus doesn t support polymorphism. The BusinessBase base class is not generic and so provides a common base class for all editable objects that is polymorphic: <Serializable()> _ Public MustInherit Class BusinessBase Inherits Csla.Core.UndoableBase Implements IEditableBusinessObject Implements System.ComponentModel.IEditableObject Implements System.ComponentModel.IDataErrorInfo Implements ICloneable Implements Csla.Security.IAuthorizeReadWrite Implements IParent Implements Server.IDataPortalTarget Implements IManageProperties End Class
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