Service Broker in .NET

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16 Service Broker
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Broker Instance
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In some cases, you might need to route a dialog to a particular database in a SQL Server instance . For example, the instance might have both a production and test version of the service in two different databases . The route to the service must be able to route the dialog to the correct database in the instance . This is done by specifying the BROKER_INSTANCE parameter in the CREATE ROUTE command . The BROKER_INSTANCE is the service_broker_guid column of the sys .databases table for the destination database . The following example shows a route with the BROKER_INSTANCE parameter specified:
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CREATE ROUTE ManufacturingRoute WITH SERVICE_NAME = '//microsoft.com/ManufacturingService', BROKER_INSTANCE = 'A29EEDD3-27E3-4591-94D9-B97BAFBDB936', ADDRESS = 'TCP://mypc11:4423';
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Service Broker uses routes in the database where the services are located to determine which remote instance messages should be sent to which service . When the message arrives at the remote instance, Service Broker must determine what to do with the incoming message . Service Broker uses the routes stored in the msdb database to decide what to do with incoming messages . For example, if there are three or four copies of the InventoryService in an instance, a route with the BROKER_INSTANCE specified can be used to route incoming messages for the InventoryService to the correct database . This can also lead to problems if the msdb database is attached or restored without the BROKER_ENABLED flag, so that Service Broker is disabled in msdb .
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Wildcards and Special Addresses
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Establishing a Service Broker conversation will fail if there is no route available for the target service . This might seem unlikely to you because if you have been following along with the examples, you have created several conversations without creating a route for the services involved . The reason this works is that there is a route called AutoCreatedLocal that is created when a database is created . If you look at this route in the sys.routes view, you will see that the remote_service_name and broker_instance columns are both NULL and the address column is LOCAL . The NULL columns are what Service Broker uses as wildcards . The wildcards mean that this route will match any service name and any broker instance . A wildcard is used as the last matching criteria so that if another route matches the service name or broker instance the more specific match will always be used . You can create your own wildcard routes by not specifying one or both of the matching parameters . The LOCAL value for the address is one of two special addresses used in Service Broker . LOCAL means that Service Broker will look for a service in the local SQL Server instance that matches the name . If the database where the route is located has a copy of the service, that copy will be used . If that database doesn t have a copy of the service, Service Broker will look in other databases in the SQL Server instance for a matching service . If more than one copy
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Inside Microsoft SQL Server 2008: T-SQL Programming
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of the service is found, a random one will be chosen . Because the AutoCreatedLocal route is a wildcard route with an address of LOCAL, Service Broker will check for a local service if there is no matching remote_service_name in the sys.routes view . The other special address is TRANSPORT . If no other match is found and there is a matching route with the TRANSPORT address, Service Broker will attempt to use the name of the service as a route . For example, if the service name is TCP://mypc11:4040/Manufacturing, Service Broker will send the message to TCP://mypc11:4040 . Although this might seem like a strange feature, think of an application that involves several thousand initiators connecting to a target service . Maintaining return routes for all the initiators on the target instance would be very painful . On the other hand, if each initiator uses its network address and port as the initiator service name, the target only needs to have a single wildcard route with the TRANSPORT address to route responses to all the initiators .
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