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<Serializable()> _ Public Class CustomPrincipal Inherits Csla.Security.BusinessPrincipalBase Private Sub New(ByVal identity As IIdentity) MyBase.New(identity) End Sub Public Shared Function Login( _ ByVal username As String, ByVal password As String) As Boolean Dim identity As CustomIdentity = _ CustomIdentity.GetIdentity(username, password) If identity.IsAuthenticated Then CustomPrincipal principal = new CustomPrincipal(identity) Csla.ApplicationContext.User = principal End If Return identity.IsAuthenticated End Function Public Shared Sub Logout() Dim identity As CustomIdentity = _ CustomIdentity.UnauthenticatedIdentity() Dim principal As New CustomPrincipal(identity) Csla.ApplicationContext.User = principal End Sub Public Overrides Function IsInRole(ByVal role As String) As Boolean Dim identity As CustomIdentity = CType(Me.Identity, CustomIdentity) Return identity.IsInRole(role) End Function End Class The BusinessPrincipalBase class implements System.Security.Principal.IPrincipal, which is the requirement for any .NET principal object. Notice that a CustomPrincipal object doesn t really do much work all the hard work is handled by the identity object: <Serializable()> _ Public Class CustomIdentity Inherits ReadOnlyBase(Of CustomIdentity) Implements IIdentity Private mRoles As New List(Of String) Private mIsAuthenticated As Boolean Private mName As String = "" Public ReadOnly Property AuthenticationType() As String _ Implements System.Security.Principal.IIdentity.AuthenticationType Get Return "Csla" End Get End Property

A connection is typically between a client process and either a dedicated server or a dispatcher However, using Oracle s Connection Manager (CMAN), a connection may be between a client and CMAN, and CMAN and the database Coverage of CMAN is beyond the scope of this book, but Oracle Net Services Administrator s Guide (freely available from http://otnoraclecom) covers it in some detail Session: A session is a logical entity that exists in the instance It is your session state, or a collection of data structures in memory that represents your unique session It is what would come first to most people s minds when thinking of a database connection It is your session in the server, where you execute SQL, commit transactions, and run stored procedures.

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The performance cost of reflection is typically negligible within the data portal. This is because the overhead of network communication and data access is so high that any overhead due to reflection usually becomes inconsequential.

We can use SQL*Plus to see connections and sessions in action, and also to recognize that it could be a very common thing indeed for a connection to have more than one session We ll simply use the AUTOTRACE command and discover that we have two sessions Over a single connection, using a single process, we ll establish two sessions Here is the first: ops$tkyte@ORA10G> select username, sid, serial#, server, paddr, status 2 from v$session 3 where username = USER 4 / USERNAME SID SERIAL# SERVER PADDR STATUS --------- ---- -------- --------- -------- -------OPS$TKYTE 153 3196 DEDICATED AE4CF614 ACTIVE Now, that shows right now that we have one session: a single dedicated server connected session The PADDR column is the address of our sole dedicated server process.

configuration file. You will learn more about configuring an emulator in 13, which covers hardware emulator components.

Now, we simply turn on AUTOTRACE to see the statistics of statements we execute in SQL*Plus: ops$tkyte@ORA10G> set autotrace on statistics ops$tkyte@ORA10G> select username, sid, serial#, server, paddr, status 2 from v$session 3 where username = USER 4 /.

Remember that the message router pattern implies that CSLA .NET has no reference to any business assembly. Business assemblies are loaded dynamically based on the request coming from the client. Reflection is used to dynamically load the assemblies and to create instances of business objects based on the classes built by the business developer. Using reflection to also invoke the DataPortal_XYZ methods on the objects means that the business developer can write strongly typed versions of those methods. After all, the business developer knows the exact type of the parameters she is sending from the client to the server, and can write data access methods to accept those types. For instance, a DataPortal_Fetch() method may look like this: Private Sub DataPortal_Fetch(ByVal criteria As MyCriteria) ' load data into object from database End Sub

USERNAME SID SERIAL# SERVER PADDR --------- ---- -------- --------- -------OPS$TKYTE 151 1511 DEDICATED AE4CF614 OPS$TKYTE 153 3196 DEDICATED AE4CF614

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