Working with Service Broker in .NET

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Working with Service Broker
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that the applications can continue with other tasks, knowing that the submitted messages will be processed as soon as possible. This storage mechanism is called a queue, which is simply a table. When an application submits a message, it is appended to the bottom of the table. And other applications read messages off the top of the table. After an application retrieves a message, that message is removed from the queue. You can move queues between databases and between servers because they are, after all, just tables. Larger applications might also need multiple copies of a queue spread across many machines to handle the volume of messages being sent. So Service Broker provides an abstraction layer to isolate applications from the physical storage that contains the messages that need to be processed. This abstraction layer is called a service. Services in a Service Broker application provide a little more than a simple abstraction layer. A service is attached to a single queue to abstract the physical storage. And the service also serves as a constraint on the conversations that are allowed, providing a well-defined interface for applications that describes the processing that the service can perform. A service constrains the types of conversations that are allowed by specifying the objects, or contracts, that can be used. The purpose of a contract is to define the list of messages that can be sent or received. Service Broker messages are further constrained by a formatting mechanism called a message type. The message type ensures that only messages that contain proper formatting are accepted. For example, you can use the message type to ensure that an endpoint that understands only English receives only English messages.
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With Service Broker s infrastructure defined, the question of how to use it with your applications still remains. The interface for an application is straightforward. Instead of inserting a row of data into a table, Service Broker applications push messages onto a queue, and the messages are picked up at a later time and processed. To accomplish this, an application starts a conversation, sends the message to a service, and then closes the conversation. Because the service is linked to a queue, this action
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Lesson 1: Exploring the Service Broker Architecture
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places a message onto the queue, and the message can then be processed later without requiring the application to wait for a response. Figure 20-1 illustrates a basic Service Broker application.
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Message Type Message Type Message Type Message Type Message Type
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Contract
Service
Service
Service
Service
Queue
Queue
Figure 20-1 Defining the relationship between Service Broker objects
Enabling Service Broker
Like all SQL Server 2005 services that are not required to run the core engine, Service Broker is disabled by default. To use the Service Broker infrastructure, you must enable it. You first need to create a database master key that will be used as the session key for all conversations. To enable Service Broker, execute the following command:
ALTER DATABASE <database_name> SET ENABLE_BROKER
CAUTION
Case-sensitive naming conventions
All identifiers in Service Broker use a binary collation and are, therefore, case sensitive, regardless of the collation settings in a particular database or instance.
Quick Check
What are the components involved in a Service Broker application, and what function does each provide A message type provides a name for a message that is allowed to be sent to an endpoint.
Quick Check Answer
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Working with Service Broker
A contract provides a list of message types that are allowed to be used. A queue is the storage structure used to store messages that need to be processed. A service provides an abstraction layer for an application; it is tied to a queue and restricts the types of messages that are allowed based on contracts it is defined to use. A conversation is the means by which messages are sent to a queue for processing.
PRACTICE
Enable Service Broker
In this practice, you will enable Service Broker and create a database master key to be used as a session key for the Service Broker conversations. 1. Launch SQL Server Management Studio (SSMS), connect to your instance, and open a new query window. 2. Execute the following batch to enable Service Broker and create the master key:
ALTER DATABASE AdventureWorks SET ENABLE_BROKER GO USE AdventureWorks GO CREATE MASTER KEY ENCRYPTION BY PASSWORD = 'fgU6*%japTwS^3L!#n' GO
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