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<Assembly: AssemblyVersion( 1.0.0.0 )>
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Replace the .snk filename as necessary.
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<Assembly: AssemblyKeyFile( c:\codearchitects.snk )>
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(See 13 for details about creating a .snk file with the SN utility.) Serviced components also require additional attributes that affect how the component is registered in the COM+ catalog the first time you instantiate them:
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<Assembly: <Assembly: <Assembly: <Assembly: ApplicationName( BankMoneyMover )>
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Description( Components for moving money between accounts )>
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ApplicationActivation(ActivationOption.Library)>
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The ApplicationName attribute is the name that identifies the application in the Com ponent Services administration snap-in; the Description attribute is used to better describe the application itself. The ApplicationID attribute assigns an explicit ID to the application. (If omitted, this ID is generated automatically when the component is reg istered.). An explicit ApplicationID value is especially useful to have multiple assem blies share the same COM+ application (and therefore the same server-side process), which in turn dramatically optimizes cross-component communication and marshaling. The ApplicationName and ApplicationID attributes affect what you see on the General tab of the application s Properties window, shown in the left portion of Figure 31-2. The ApplicationActivation attribute is crucial, as it determines whether the COM+ compo nent runs as a library application (in the creator s process) or as a server application (in a distinct process hosted in the DllHost.exe executable). In this first example, we ll create a
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31:
Serviced Components
library application, but you ll later learn that you need server applications to enable a few important features, such as the ability to run on a remote system or as an NT service, or to implement more robust security checks. (See right portion of Figure 31-2.)
Figure 31-2 The General and Activation tabs of the Properties window of a COM+ component; you can display this window by choosing the Properties command from the component s context menu.
Note The Disable Deletion and Disable Changes check boxes on the Advanced tab of the component s Properties window must be deselected for you to be allowed to change any application setting or delete the application from the COM+ catalog.
Defining a Transactional Class
You can now turn your attention to the MoneyMover class, which contains a public method named TransferMoney and a private method named UpdateAccount. The latter method adds or takes money from a given account but throws an exception if the account ID isn t valid or if the new balance for that account would be negative.
<Transaction(TransactionOption.Required), JustInTimeActivation()> _ Public Class MoneyMover Inherits ServicedComponent Sub TransferMoney(ByVal senderID As Integer, ByVal receiverID As Integer, _ ByVal amount As Decimal) Open the connection. Dim cn As New SqlConnection( Data Source=.; _ & Initial Catalog=BankAccounts;Integrated Security=SSPI; ) Try cn.Open() UpdateAccount(cn, senderID, -amount) UpdateAccount(cn, receiverID, amount) Tell COM+ that transaction can be committed. ContextUtil.SetComplete() Catch ex As Exception Tell COM+ that the transaction must be aborted, then rethrow.
Part VII:
Advanced Topics
ContextUtil.SetAbort() Throw ex Finally Close the connection in all cases. cn.Close() End Try End Sub Add or take money from an account. Private Sub UpdateAccount(ByVal cn As SqlConnection, ByVal id As Integer, _ ByVal amount As Decimal) Create a command that adds or takes money in a safe manner. Dim sql As String = UPDATE Accounts SET Balance = Balance + @amount _ & WHERE ID = @id AND Balance + @amount >= 0" Dim cmd As New SqlCommand(sql, cn) cmd.Parameters.Add( @id", id) cmd.Parameters.Add( @amount", amount) Execute the command, throw if no row matched the WHERE condition If cmd.ExecuteNonQuery() = 0 Then Throw New Exception( Unable to update account# & id.ToString) End If End Sub End Class
The Transaction attribute is what makes or can make, at least the MoneyMover class a transactional class. This attribute takes a TransactionOption enumerated value, which can be one of the following:
NotSupported COM+ ignores the transactional attributes when determining the transactional context for the object. Disabled The object isn t a transactional object and never participates in a transaction, even if the caller has one. Supported The object can participate in a transaction, if the caller has one, but doesn t require a transaction if no transaction exists. Required The object will participate in a transaction, and a new transaction will be created for it if the caller has no transaction. RequiresNew The object always runs in a new transaction, even if the caller already has a transaction.
All transactional objects that is, objects marked with the Required or RequiresNew value for the Transaction attribute must vote for the outcome of the transaction they live in. If something goes wrong, they should tell COM+ to abort the transaction they live in, which they do by invoking the ContextUtil.SetAbort method. If everything is OK, they should tell COM+ to commit the transaction, which they do by invoking the ContextUtil.SetComplete method. (See boldface statements in previous code snippet.) Notice that the SetComplete and SetAbort methods aren t symmetrical. All the components that live in the transaction must vote with SetComplete for a transaction to be committed successfully, whereas just a single SetAbort method is enough to doom the transaction.
31:
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