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In 5, I introduced the ServiceBrokerInterface managed assembly. With this assembly, you can write Service Broker applications with managed code. One nice thing about this managed assembly is that it also supports message processing with state handling. In this section, I will show you step by step how you can port the T-SQL processing logic from Listing 6-8 to a managed stored procedure that incorporates functionality from the ServiceBrokerInterface managed assembly. First, you have to create a new managed class library that implements the managed stored procedure. For this sample, I have called this library TargetService. Inside this class library, you create a new class called ProductOrderService that represents the server-side managed stored procedure that processes request messages from other Service Broker services. Listing 6-9 shows the skeleton of the managed stored procedure.

To create these examples as VS SQL Server projects, you ll need to deploy that DLL manually to SQL Server using a CREATE ASSEMBLY statement before you can reference it from the SQL Server assembly..

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Listing 6-9. The Skeleton of a Managed Stored Procedure public class ProductOrderService : Service { private Guid _conversationGroupId; private bool _creditCardValidationStatus; private bool _inventoryAdjustmentStatus; private bool _shippingStatus; private bool _accountingStatus; public ProductOrderService(SqlConnection Connection) : base("ProductOrderService", Connection) { WaitforTimeout = TimeSpan.FromSeconds(1); AppLoaderProcName = "LoadApplicationState"; } public static void ServiceProcedure() { Service service = null; SqlConnection cnn = null; try { cnn = new SqlConnection("context connection=true;"); cnn.Open(); service = new ProductOrderService(cnn); service.FetchSize = 1; service.Run(true, cnn, null); } catch (ServiceException ex) { if (ex.Transaction != null) ex.Transaction.Rollback(); } finally { if (cnn != null) cnn.Close(); } } } The only difference in this skeleton is that you initialize the AppLoaderProcName property with the name of another stored procedure implemented in T-SQL. This stored procedure loads the application state for the conversation group that is currently processed. For this

-- 1 = output the code without executing @Debug bit = 0 AS DECLARE @DeleteDate NVARCHAR(19), @BakDir NVARCHAR(255), @Exists INT DECLARE @FileExists TABLE (FileExists INT NOT NULL, FileIsDirectory INT NOT NULL, ParentDirectoryExists INT NOT NULL) SET NOCOUNT ON SET @DeleteDate = CONVERT(NVARCHAR(19), DATEADD(DAY, -@Retention, GETDATE()), 126) IF @DBName IS NOT NULL BEGIN IF NOT EXISTS (SELECT 1 FROM sys.databases WHERE name = @DBName) BEGIN RAISERROR ('The specified database [%s] does not exist. Please check the name entered or do not supply a database name if you want to delete the log backups for all databases.', 16, 1, @DBName); RETURN; END END IF @LogBackupLocation IS NULL BEGIN EXEC xp_instance_regread N'HKEY_LOCAL_MACHINE', N'Software\Microsoft\MSSQLServer\MSSQLServer', N'BackupDirectory', @BakDir output, 'no_output'; IF @BakDir IS NOT NULL BEGIN INSERT INTO @FileExists EXEC sys.xp_fileexist @BakDir;

reason, the managed assembly provides the virtual LoadState method that you can override in your derived service class. The LoadState method is called inside the private FetchNextMessageBatch method in the Service base class when the managed stored procedure wants to retrieve new messages from the service queue. Listing 6-10 shows the implementation of the FetchNextMessageBatch method, which also calls the overridden LoadState method. Listing 6-10. The FetchNextMessageBatch Method private void FetchNextMessageBatch( Conversation conversation, SqlConnection connection, SqlTransaction transaction) { SqlCommand cmd; if (conversation != null || m_appLoaderProcName == null) { cmd = BuildReceiveCommand(conversation, connection, transaction); SqlDataReader dataReader = cmd.ExecuteReader(); m_reader.Open(dataReader); } else if (m_appLoaderProcName != null) { cmd = BuildGcgrCommand(connection, transaction); SqlDataReader dataReader = cmd.ExecuteReader(); if (!LoadState(dataReader, connection, transaction)) { dataReader.Close(); return; } m_reader.Open(dataReader); } } As you can see in Listing 6-10, the LoadState method is called automatically when the AppLoaderProcName property is set accordingly. The interesting thing about this is that your specified stored procedure was already executed when your implementation of the LoadState method was called in the derived class. Therefore, you only get as a parameter an instance of a SqlDataReader class that contains the application state that your specified stored procedure has returned as a result. Before I show you the actual implementation of the LoadState method, I ll show you (in Listing 6-11) the T-SQL statements that the BuildGcgrCommand method creates for SqlCommand execution.

Summary

Listing 6-11. Message Receiving and State Handling in One T-SQL Batch DECLARE @cgid UNIQUEIDENTIFIER; WAITFOR ( GET CONVERSATION GROUP @cgid FROM ProductOrderQueue ), TIMEOUT @to;

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