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C HAPTE R 6 BUSINES S FRAM EWORK IMPLEMENTA TION
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Table 6-2. Primary Classes in the Csla Namespace
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Type
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ApplicationContext BusinessBase BusinessListBase CommandBase CriteriaBase DataPortal EditableRootListBase NameValueListBase PropertyInfo ReadOnlyBase ReadOnlyListBase SingleCriteria SmartDate Utilities
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Description
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Class that provides access to important application context information; used by the framework, business classes, and UI code Base class from which editable root, child, and switchable objects inherit Base class from which editable root and child list objects inherit Base class from which command objects inherit Base class from which custom criteria objects inherit Class that exposes the data portal functionality to the client Base class from which dynamic list objects inherit Base class from which name/value list objects inherit Class that defines metadata for each business object property Base class from which read-only root and child objects inherit Base class from which read-only root and child list objects inherit Class that provides a single value criteria for any object Type that extends DateTime to add the concept of an empty date and other features Type that includes utility methods used by other classes
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I ll discuss each of these types at a high level.
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ApplicationContext
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The ApplicationContext class is a central location from which application context information can be accessed. Some of this context comes from the application s configuration file, some from inmemory settings, and some from ambient environmental values in .NET. Table 6-3 lists the context information available through ApplicationContext.
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Table 6-3. Context Data Contained Within ApplicationContext
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Context Data
GlobalContext
Description
Collection of context data that flows from client to server and then from server back to client; changes on either end are carried across the network Collection of context data that flows from client to server; changes on the server are not carried back to the client Collection of context data that exists only in the current location (client or server) Current .NET security (principal) object; safely accesses this value independent of runtime (ASP.NET, WPF, and so on)
ClientContext LocalContext User
CHAPTER 6 BUS INE SS FRA MEWORK I MPLEME NTA T ION
Table 6-3. Context Data Contained Within ApplicationContext (Continued)
Context Data
AuthenticationType DataPortalProxy DataPortalUrl IsInRoleProvider AutoCloneOnUpdate
Description
Authentication setting from the CslaAuthentication config value Data portal proxy provider setting from the CslaDataPortalProxy config value Data portal URL value for Remoting proxy from the CslaDataPortalUrl config value IsInRole provider type name from the CslaIsInRoleProvider config value Setting indicating whether objects are cloned before update through the local data portal, setting from the CslaAutoCloneOnUpdate config value Serialization provider type name from the CslaSerializationFormatter config value Setting indicating how the PropertyChanged event should be raised (different for Windows Forms or WPF), setting from the CslaPropertyChangedMode config value Value indicating whether the code is currently executing on the client or server side of the data portal
SerializationFormatter PropertyChangedMode
ExecutionLocation
These context values can be grouped into three areas: configuration settings, ambient values, and context dictionaries.
Configuration Settings
The configuration settings include items read from the config file. This is done using the standard .NET System.Configuration.ConfigurationManager class. In this case, ApplicationContext is simply wrapping existing functionality to provide a more abstract way to access the config values.
Ambient Values
The ambient values include the User and ExecutionLocation properties. Each one is different and is worth discussing.
User Property
When code is running outside ASP.NET, it relies on System.Threading.Thread.CurrentPrincipal to maintain the user s principal object. On the other hand, when code is running inside ASP.NET, the only reliable way to find the user s principal object is through HttpContext.Current.User. Normally, this would mean that you would have to write code to detect whether HttpContext.Current is Nothing and use System.Threading only if HttpContext isn t available. The User property automates this process on your behalf: Public Shared Property User() As IPrincipal Get If HttpContext.Current Is Nothing Then Return Thread.CurrentPrincipal
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Else Return HttpContext.Current.User End If End Get Set(ByVal value As IPrincipal) If HttpContext.Current IsNot Nothing Then HttpContext.Current.User = value End If Thread.CurrentPrincipal = value End Set End Property In general, Csla.ApplicationContext.User should be used in favor of either System.Threading or HttpContext directly because it automatically adjusts to the environment in which your code is running. With CSLA .NET based applications, this is particularly important because your client code could be a Windows Forms application but your server code could be running within ASP.NET. Remember that your business objects run in both locations and so must behave properly both inside and outside ASP.NET.
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