Lesson 3: Creating Queues and Services in Visual Studio .NET

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Lesson 3: Creating Queues and Services
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Creating a Service
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A service defines the endpoint, or queue, that a conversation will use as well as the types of conversations, or contracts, that are allowed on a queue. The general format of the command to create a new service is as follows:
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CREATE SERVICE service_name [ AUTHORIZATION owner_name ] ON QUEUE [ schema_name. ]queue_name [ ( contract_name | [DEFAULT] [ ,...n ] ) ]
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As with all Service Broker objects previously discussed, the AUTHORIZATION clause defines the owner of the service. You specify a single queue name in the ON QUEUE clause. So for effective communication to occur, you need to create two services: one for the initiator and one for the target. In the body of the CREATE SERVICE command, you then specify one or more contracts for the specified queue.
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You might be wondering why you can t have an application reference a queue directly instead of having to create yet another object that essentially provides a pointer to the queue. Service Broker applications are designed to be distributed as well as to provide load-balancing capability. A particular service could reference multiple queues on multiple machines to provide scalability and load balancing. It is also possible to back up a queue and move it to another machine in case of a disaster or when you need to increase processing capacity. If applications directly accessed queues, any infrastructure changes would require you to rewrite the applications. The service provides an interface abstraction for applications. An administrator can then manage the infrastructure as needed to provide the capacity and recoverability required without affecting the application. A basic example of a statement to create a service is as follows:
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CREATE SERVICE BOMRequestService ON QUEUE BOMProductIDQueue (BillOfMaterialsContract)
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Working with Service Broker
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Quick Check
What capability does a service enable for a Service Broker application A service defines the endpoint (queue) that is used for requests and the types of conversations (contracts) that are allowed on the queue, providing an abstraction layer for applications to interact with Service Broker so that changes in infrastructure do not require changes to an application.
Quick Check Answer
PRACTICE
Creating Queues and Services
In these practices, you create the message storage system as well as the abstraction interface for a Service Broker application.
Practice 1: Create a Queue
In this practice, you create two basic queues to work with the message types and contracts you created in Lesson 2. Because the processing you use these for is manual in nature, you do not need to specify any activation. 1. If necessary, launch SSMS, connect to your SQL Server instance, and open a new query window. 2. Execute the following batch to create two queues named BOMProductIDQueue and BOMResultQueue:
CREATE QUEUE BOMProductIDQueue CREATE QUEUE BOMResultQueue
Practice 2: Create a Service
In this practice, you create the two services that will be used in our ongoing example to enable a product ID to be sent to a database and have a Bill of Materials returned. 1. If necessary, launch SSMS, connect to your instance, and open a new query window. 2. Type in and execute the following batch to create two services BOMRequestService and BOMResponseService on the queues you just created and to allow the contract called BillOfMaterialsContract.
CREATE SERVICE BOMRequestService ON QUEUE BOMProductIDQueue (BillOfMaterialsContract) CREATE SERVICE BOMResponseService ON QUEUE BOMResultQueue (BillOfMaterialsContract)
Lesson 3: Creating Queues and Services
Lesson Summary
Queues store messages until they can be processed. Because queues are hidden tables within the storage engine, they can be backed up and even restored to another server in the event of failure, ensuring the reliability of messages that are sent for processing. By using the activation capability of queues, you can create automated systems that begin processing messages as soon as they arrive on the queue. A Service Broker service defines the main communication path for a conversation, including the endpoint (queue) to use and the types of conversations (contracts) that are allowed on the queue.
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