Advanced Topics in .NET framework

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Advanced Topics
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You can read and set the two bits individually by means of the MyTransactionVote property (the consistent bit) and the DeactivateOnReturn property (the done bit):
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Sub MyMethod() The object will be deactivated at the end of this method (unless the DeactivateOnReturn is set to False later in this code). ContextUtil.DeactivateOnReturn = True End Sub
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Notice, however, that you can t prevent a JIT object from being deactivated on return from a method that has been flagged with the AutoComplete attribute.
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The SecurityCallContext Class
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The ContextUtil class exposes only a couple of methods that are related to COM+ secu rity; for more serious work, you must use the methods of the SecurityCallContext class. First you need to get a reference to an object of this class by means of the CurrentCall shared property:
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Dim scc As SecurityCallContext = SecurityCallContext.CurrentCall
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You are already familiar with two members of this class, the IsCallerInRole method and the IsSecurityEnabled property, which return the same values as the ContextUtil class s members with same name:
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If scc.IsSecurityEnabled And scc.IsCallerInRole( Managers ) Then End If
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You can check whether a specific user is in a role with the IsUserInRole method:
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If scc.IsUserInRole( HPP4\Francesco", Managers ) Then ...
Three properties return information about callers of the current method: OriginalCaller, DirectCaller, and the Callers collection. The caller identity is returned as a SecurityIden tity object, which has properties such as AccountName, AuthenticationLevel, and ImpersonationLevel:
Display information about all callers of this method. For Each si As SecurityIdentity In scc.Callers Debug.WriteLine(String.Format( AccountName={0}, _ & AuthenticationLevel={1}, ImpersonationLevel={2}", _ si.AccountName, si.AuthenticationLevel, si.ImpersonationLevel)) Next
The BYOT (Bring Your Own Transaction) Class
The preferred way to perform transactional works in COM+ is by leveraging the auto matic transactions enforced by the Transaction attribute. In some circumstances,
31:
Serviced Components
however, your application might receive a reference to an object that is already run ning inside an MS DTC transaction, and you might need to enroll one of your compo nents in the same transaction. You can enroll a component in a preexisting transaction if you can obtain a reference to the ITransaction object that represents the transaction itself. If the object is a serviced component that you have authored, you can implement a public function that returns the value of the ContextUtil.Transaction property:
Public Class TxComponent Return the current transaction object. Public Function GetTransaction() As ITransaction Return ContextUtil.Transaction End Function Commit or abort the current transaction. Sub CompleteTransaction(ByVal vote As TransactionVote) ContextUtil.MyTransactionVote = vote ContextUtil.DeactivateOnReturn = True End Sub Plus all the usual transactional methods. End Class
You can then instantiate an object and have it run in the same transaction by means of the CreateWithTransaction shared method of the BYOT class, as in this code:
Dim c1 As New TxComponent Try This method keeps the transaction open. c1.UpdateAccount(1) Get a reference to the transaction. Dim tx As ITransaction = c1.GetTransaction() Create another object in the same transaction. Dim c2 As TxComponent = DirectCast(BYOT.CreateWithTransaction(tx, _ GetType(TxComponent)), TxComponent) Run method from the new object in the same transaction. c2.UpdateAccount(2) If no exception, commit the transaction. c1.CompleteTransaction(TransactionVote.Commit) Catch ex As Exception Else, rollback the transaction. c1.CompleteTransaction(TransactionVote.Abort) MsgBox(ex.Message, MsgBoxStyle.Critical, Error ) End Try
In this example, the TxComponent exposes two methods for retrieving the current transaction and for committing (or aborting) it. The latter method isn t strictly required, however, because the client can control the transaction directly through the reference to the ITransaction object.
Part VII:
Advanced Topics
The BYOT class exposes another method, named CreateWithTipTransaction, which lets you enlist an object in a Transaction Internet Protocol (TIP) transaction.
The Connection.EnlistDistributedTransaction Method
Another way to leverage the ContextUtil.Transaction property is to pass its value to the EnlistDistributedTransaction method exposed by Connection objects in all the ADO.NET managed providers that come with version 1.1 of .NET Framework. This method forces the Connection object to take part in a specific MS DTC transaction:
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