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ALTER PROCEDURE dbo.InventoryProc AS Declare @message_body AS xml; Declare @response AS xml; Declare @message_type AS sysname; Declare @dialog AS uniqueidentifier ; Declare @hDoc AS int; -- This procedure will process event messages from -- the queue until the queue is empty WHILE (1 = 1) BEGIN BEGIN TRANSACTION -- Receive the next available message WAITFOR ( RECEIVE top(1) -- just handle one message at a time @message_type = message_type_name, @message_body = message_body, @dialog = conversation_handle FROM dbo.InventoryQueue ), TIMEOUT 2000 -- If we didn't get anything, break out of the loop IF (@@ROWCOUNT = 0) BEGIN ROLLBACK TRANSACTION BREAK; END /*--------------------------------------------------------------------- Message handling logic based on the message type received --------------------------------------------------------------------*/ -- Handle End Conversation messages by ending our conversation also IF (@message_type = 'http://schemas.microsoft.com/SQL/ServiceBroker/EndDialog') BEGIN PRINT 'End Dialog for dialog # ' + cast(@dialog as nvarchar(40)); END CONVERSATION @dialog; END -- For error messages, just end the conversation. In a real app, we -- would log the error and do any required cleanup. ELSE IF (@message_type = 'http://schemas.microsoft.com/SQL/ServiceBroker/Error')

BEGIN PRINT 'Dialog ERROR dialog # ' + cast(@dialog as nvarchar(40)); END CONVERSATION @dialog; END -- Handle an AddItem message ELSE IF (@message_type = '//microsoft.com/Inventory/AddItem') BEGIN SET @response = N'Item added successfully' -- Parse the message body and add to the inventory BEGIN TRY INSERT INTO dbo.Inventory (PartNumber, Description, Quantity, ReorderLevel, Location) select itm.itm. value ('(PartNumber/text())[1]', 'nvarchar(50)') as PartNumber, itm.itm.value('(Description/text())[1]', 'nvarchar(2000)') as Description, itm.itm.value('(Quantity/text())[1]', 'int') as Quantity, itm.itm.value('(ReorderLevel/text())[1]', 'int') as ReorderLevel, itm.itm.value('(Location/text())[1]', 'nvarchar(50)') as Location from @message_body.nodes('/Item[1]') as itm(itm); END TRY BEGIN CATCH ROLLBACK TRANSACTION -- Create a new transaction to send the response BEGIN TRANSACTION SET @response = ERROR_MESSAGE(); -- ToDo - log the error -- ToDo - poison message handling END CATCH; -- Send a response message confirming the add was done SEND ON CONVERSATION @dialog MESSAGE TYPE [//microsoft.com/Inventory/ItemAdded] (@response); -- We handle one message at a time so we're done with this dialog END CONVERSATION @dialog; END -- If message type COMMIT TRANSACTION END -- while GO

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The process flow of this procedure demonstrates the flow of almost all Service Broker services . The procedure is a continuous loop that receives a message at the top, processes the message with conditional logic based on the message type received, and then goes back to the top and receives another message . The loop continues until the @@ROWCOUNT after RECEIVE is 0, which indicates the queue is empty . Each loop iteration is a separate transaction, which means there is only one message per transaction . This is not optimal, but it makes the logic easier to follow, so I usually do this for samples . A high-performance Service Broker application would

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read all the messages available for a conversation group in a single RECEIVE statement and then process them all at once If the message volume is high, you might also consider going through the loop a few times before committing the transaction This approach makes the logic more efficient, but it also makes the processing logic much more complex The message processing logic is the T-SQL equivalent of a C# switch statement with separate sections for the three message types that might be found on the queue It s important to remember that because a RECEIVE statement specifies a queue, any message type allowed on the queue might be received This means that if two or more services are associated with the queue, the logic in the queue reader must be able to process any message allowed on any of the services .

The first two message types are Error and EndDialog These two message types can be received by any service, so all service logic must have logic to handle them At a minimum, the message-handling logic must contain an END CONVERSATION to close out this end of the dialog If some cleanup is required before ending the conversation, handling these messages will include the cleanup logic in addition to ending the conversation The last message type is the AddItem message The message body is an XML document that contains the data required to add a row to the Inventory table The sample code processes the message with an XML Nodes query that inserts the XML data into the Inventory table The error-handling logic is not robust, and it s there only to illustrate where real error-handling would go .

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