Service Broker in .NET framework

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messages arrive on a conversation . This checking is specified with the VALIDATION clause of the CREATE MESSAGE TYPE command:
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CREATE MESSAGE TYPE [ VALIDATION = { | | | message_type_name NONE EMPTY WELL_FORMED_XML VALID_XML WITH SCHEMA COLLECTION schema_collection_name } ]
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The NONE option, as the name implies, performs no validation, and it is the default . The EMPTY option ensures that the message body is NULL . Messages with a type but no body are useful as flags . For example, a message that reports that an action has completed successfully might not have any data to convey, so a message with a type of Success with no body might be appropriate . The WELL_FORMED_XML option loads the message body into an XML parser and rejects the message if parsing fails . The VALID_XML option loads the message body into the XML parser and validates the XML with the specified SCHEMA COLLECTION . (See SQL Server Books Online for a more complete explanation of what a schema collection is and how to create one .) For purposes of this chapter, it s enough to know that the message contents must be valid based on the schemas in the schema collection . Because a schema collection can contain many schemas, it is possible to use a single schema collection to validate a number of message types . Although using one of the XML validations will ensure that your application can handle the incoming message, Service Broker loads the message body into an XML parser to validate it and then, in most cases, the application will load it into a different parser to process it . This process can be a significant resource drain if message volumes and message sizes are large, so unless you are receiving messages from an untrusted source, it might make sense to just use validation until you have your application working correctly and then turn it off when you go into production . Because validation is configured per message type, it s possible to validate only a few message types that have a higher potential to be invalid . All Service Broker metadata can be seen in SQL Server catalog views . The view for message types is sys.service_message_types . If you look at that view in a user database, you will find several system-defined message types . The message types that begin with http://schemas.microsoft.com/SQL/ServiceBroker/ are used by the Service Broker features . The other system-defined message types are used by other features such as Query Notifications and Events, which use Service Broker to deliver messages .
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Contracts
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Just as message types constrain the names and contents of conversation messages, a Service Broker contract constrains which message types are allowed in a conversation . A contract, as its name implies, is an agreement between the endpoints in a Service Broker conversation as to which message types can be sent and who can send them . Because the Service Broker
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Inside Microsoft SQL Server 2008: T-SQL Programming
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enforces the contract, applications that process the conversation can be assured that they won t receive any message types that they aren t equipped to handle . To further ensure this agreement, once a Service Broker contract is created, the list of message types can t be changed . A contract, like a message type, is a piece of Service Broker metadata that is used by Service Broker to enforce constraints on conversations . Each contract has a name, a list of what message types can be sent on the contract, and information that specifies which endpoint can send the approved message type . Because the endpoints of a conversation are peers once the conversation is established, the only real differentiator among endpoints is which one started the conversation . The endpoint that started the conversation is called the INITIATOR, and the opposite endpoint is called the TARGET . These labels are used to specify which endpoint can send a message type . The contract must specify the allowed sender or senders of each message type in the conversation by specifying INITIATOR, TARGET, or ANY for the message type . Put this all together and you get the following CREATE CONTRACT statement:
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CREATE CONTRACT [//microsoft.com/Inventory/AddItemContract] ([//microsoft.com/Inventory/AddItem] SENT BY INITIATOR, [//microsoft.com/Inventory/ItemAdded] SENT BY TARGET);
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Notice that the contract also uses a URL-like name format because it too is sent as part of the message header . The contract name uses a binary collation also, so be careful of the case when typing the name . There s no ALTER CONTRACT statement for adding or removing message types, so you have to get the CREATE CONTRACT right . The only way to change the message type list is to drop the contract and create a new one . The catalog view for listing contracts is sys.service_contracts . The view that describes how messages are related to contracts is sys.service_contract_message_usages . The following query generates a list of all the message types in the database, what contracts they are used in, and which endpoints send them:
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SELECT C.name AS Contract, M.name AS MessageType, CASE WHEN is_sent_by_initiator = 1 AND is_sent_by_target = 1 THEN 'ANY' WHEN is_sent_by_initiator = 1 THEN 'INITIATOR' WHEN is_sent_by_target = 1 THEN 'TARGET' END AS SentBy FROM sys.service_message_types AS M JOIN sys.service_contract_message_usages AS U ON M.message_type_id = U.message_type_id JOIN sys.service_contracts AS C ON C.service_contract_id = U.service_contract_id ORDER BY C.name, M.name;
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