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16 Service Broker
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dialog will be the ManufacturingService . Because the BEGIN DIALOG command uses the ManufacturingService as the target service name, the ManufacturingService is the initiator of the dialog and the InventoryService is the target . Listing 16-3 creates the queue and service for the ManufacturingService, and it creates the stored procedure to send the AddItem message .
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LiSTing 16-3 Dialog initiator procedure
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/*-------------------------------------------------------------------- Create an empty procedure for the initiator so we can use it -- in the activation parameters when we create the queue -------------------------------------------------------------------*/ CREATE PROCEDURE dbo.ManufacturingProc RETURN 0; GO AS
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/*-------------------------------------------------------------------- Create the initiator queue. Activation is configured -------------------------------------------------------------------*/ CREATE QUEUE dbo.ManufacturingQueue WITH ACTIVATION ( STATUS = ON, PROCEDURE_NAME = dbo.ManufacturingProc MAX_QUEUE_READERS = 2, EXECUTE AS SELF );
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/*-------------------------------------------------------------------- Create the Manufacturing service. Because it is the initiator, it -- doesn't require contracts. -------------------------------------------------------------------*/ CREATE SERVICE [//microsoft.com/ManufacturingService] ON QUEUE dbo.ManufacturingQueue; /*--------------------------------------------------------------------- Create a table to hold the state for our conversation -- We use the conversation handle as a key instead of the -- conversation group ID because we just have one conversation -- in our group. --------------------------------------------------------------------*/ CREATE TABLE dbo.InventoryState ( PartNumber UNIQUEIDENTIFIER Primary Key Clustered NOT NULL, Dialog UNIQUEIDENTIFIER NULL, State NVARCHAR(50) NULL ); GO
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/*-------------------------------------------------------------------- Create the initiator stored procedure -------------------------------------------------------------------*/ CREATE PROCEDURE AddItemProc AS DECLARE @message_body DECLARE @Dialog DECLARE @partno AS xml; AS uniqueidentifier; AS uniqueidentifier;
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--Set the part number to a new GUID so we can run --this an unlimited number of times SET @partno = NEWID(); -- Populate the message body SET @message_body = '<Item> <PartNumber>' + CAST (@partno as NVARCHAR(50)) + '</PartNumber> <Description>2 cm Left Threaded machine screw</Description> <Quantity>5883</Quantity> <ReorderLevel>1000</ReorderLevel> <Location>Aisle 32, Rack 7, Bin 29</Location> </Item>'; BEGIN TRANSACTION -- Begin a dialog to the Hello World Service BEGIN DIALOG @Dialog FROM SERVICE [//microsoft.com/ManufacturingService] TO SERVICE '//microsoft.com/InventoryService' ON CONTRACT [//microsoft.com/Inventory/AddItemContract] WITH ENCRYPTION = OFF, LIFETIME = 3600; -- Send message SEND ON CONVERSATION @Dialog MESSAGE TYPE [//microsoft.com/Inventory/AddItem] (@message_body); -- Put a row into the state table to track this conversation INSERT INTO dbo.InventoryState VALUES (@partno, @Dialog, 'Add Item Sent'); COMMIT TRANSACTION GO
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This service uses the message types and contract created for the InventoryService, so they don t have to be created again . If you create this service in another database, you must first create the message types and contract in that database . AddItemProc is a simple procedure . It populates the message body with an XML document, begins a dialog to the InventoryService, and sends the message . For each message sent, a row is inserted into the InventoryState table . The InventoryState table tracks the progress of the AddItem messages, so a user can see the progress of the dialog .
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16 Service Broker
To see whether this works, first run the following:
EXEC AddItemProc
If everything is working correctly, there should be a row in the Inventory table and a row in the InventoryState table . Because you haven t written the logic to handle the response yet, there should be a response message in the ManufacturingQueue . As you can see from these queries and their results, everything is indeed working correctly:
SELECT * FROM Inventory.dbo.[Inventory] PartNumber Description Quantity -------------- --------------------- -------FB0CDFF2-A7 2 cm Left Threaded 5883 SELECT * FROM [InventoryState] PartNumber Dialog State ------------------------------------ ------------------------------------ -----FB0CDFF2-A776-43BC-B7BE-52B970CD34F7 10117F26-9E74-DE11-AE90-0015B7D4AC66 Add Item Sent SELECT CAST(message_body AS NVARCHAR(MAX)) AS msg FROM ManufacturingQueue msg ---------------------Item added successfully ReorderLevel Location ------------ -------1000 Aisle 32
You have now sent a message on a dialog, processed the message, and sent a response message . All that s left to do is process the response message . To do this, run the code in Listing 16-4 to create another simple Service Broker service with a message processing loop . The process flow will be the same as that for the inventory procedure .
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