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Messages are encrypted only if they are exchanged between SQL Server instances. If messages are sent and received within the same instance of SQL Server, they are never encrypted.
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What are the elements required to create a conversation A conversation requires you to specify two services and a contract. One service defines the initiator of the dialog; the other service defines the target of the dialog. The specified contract has to be accepted by the target service.
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Routing Messages to a Service
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When a service sends a message over a conversation, Service Broker uses routes to locate the service to receive the message. When that service responds, Service Broker then uses routes to locate the initiator service. To determine the route for a conversation, SQL Server matches the service name and the broker instance identifier that you specified in the BEGIN DIALOG CONVERSATION statement against the service name and broker instance identifier that are specified in the route. If a route does not provide a service name or broker instance identifier, any service name or broker instance identifier can be a match. For services that do not have a route defined, each database has a default route called AutoCreatedLocal that ensures that messages are delivered within the current SQL Server instance.
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MORE INFO
Selecting a route
When more than one route matches a conversation, SQL Server uses a complex process to select a route. For information about this process, see the SQL Server 2005 Books Online topic Service Broker Routing. SQL Server 2005 Books Online is installed as part of SQL Server 2005. Updates for SQL Server 2005 Books Online are available for download at www.microsoft.com/technet/prodtechnol/ sql/2005/downloads/books.mspx.
When the initiator receives an acknowledgment message from the target, the initiator uses the broker instance identifier in the acknowledgment message to route subsequent messages to the same target. For each database that contains a service, you can specify a route for the external services that the service communicates with. You use the CREATE ROUTE statement to add a new route to the routing table for the current database. You should specify three key components for the CREATE ROUTE statement: the name of the service for the
Lesson 4: Creating Conversations
route, the broker instance identifier of the database to send the messages to, and the network address of the broker that hosts the service. For messages on conversations within the local instance, Service Broker determines routing by checking the routing table, sys.routes, in the local database. For messages on conversations that originate in another instance, Service Broker checks the routes in msdb.sys.routes.
PRACTICE
Create a Conversation
In this practice, you create a conversation that will use your previously created services and contracts. 1. If necessary, launch SSMS, connect to your instance, and open a new query window. 2. Execute the following batch to begin a conversation between the BOMRequestService and the BOMResponseService:
DECLARE @dialoghandle uniqueidentifier BEGIN DIALOG CONVERSATION @dialoghandle FROM SERVICE BOMRequestService TO SERVICE 'BOMResponseService' ON CONTRACT BillOfMaterialsContract SELECT @dialoghandle
NOTE
Using the conversation
Please leave the query window open for the next exercise, which uses the conversation you just created.
Lesson Summary
Conversations provide a mechanism for reliable and ordered processing of messages, even across transactions, server restarts, or disasters. Conversations define that all messages are exchanged between an initiator service and a target service that is constrained by a particular contract.
20
Working with Service Broker
Lesson Review
The following questions are intended to reinforce key information presented in this lesson. The questions are also available on the companion CD if you prefer to review them in electronic form.
NOTE
Answers
Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.
1. How does a conversation ensure a message order A. Message ID B. Sequence number C. Conversation ID D. Contract ID
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