Working with Service Broker in VS .NET

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Working with Service Broker
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Lesson 1: Exploring the Service Broker Architecture
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Service Broker provides a new architectural service for building asynchronous, highly scalable applications. The first step in building Service Broker applications is to understand how all the components fit together to create a solution. In this lesson, you will explore the components of a Service Broker solution, get an overview of how applications interact with Service Broker, and see how to enable Service Broker s services in SQL Server 2005.
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After this lesson, you will be able to:
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Identify the components of a Service Broker solution. Understand how Service Broker interacts with an application. Enable Service Broker.
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Estimated lesson time: 15 minutes
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Messaging Overview
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Much of the documentation related to Service Broker revolves around messages and how to process them. Unfortunately, most database developers and administrators stop as soon as they see the word message. After all, we are talking about database applications, so transactions have to be used to submit, modify, and retrieve data in a reliable manner. Messages belong in an e-mail system, not in a database, right This perspective could not be further from the truth. It is simply an unfortunate misunderstanding of what a message really is. Every computer system ever built deals with messages. It is unavoidable. Data has to be input. Code has to be executed to process the data. And the results have to be returned to something. These are all messages, meaning directives to do something. In the computing world, this concept can be a bit amorphous. An application sending a message that contains a CustomerID is pretty esoteric. What does it mean Is the application asking for the name of the customer Is the application asking for all orders that have been placed by the customer Is the application asking for the address of the customer The answer to these questions and many more like them is yes, no, and all of the above. We simply do not know. However, the application sending the message containing the CustomerID doesn t simply broadcast it to the network, it sends the CustomerID to a particular application. And a developer has coded the application that receives the CustomerID to perform a specific action.
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Lesson 1: Exploring the Service Broker Architecture
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So a message without a means to process it is of no value. And an application without any capability to accept input is equally worthless. These two components rely on each other to create value. What does any of this philosophy of messaging have to do with Service Broker or your business needs Service Broker provides the mechanisms to process messages, going several steps beyond just accepting any message that someone wants to send and then passing it on to something that processes the data. Service Broker provides the objects and infrastructure to ensure that messages are formatted correctly so that applications can understand them, and it ensures that the only messages that are accepted are those associated with applications that understand how to process the messages.
Service Broker Components
To understand all the pieces required to create a Service Broker application that enables communication to be controlled, reliable, robust, and scalable, let s look at the elements from the outside in. First, communication must occur between a source and a target. In Service Broker, they are called endpoints. The physical implementation of an endpoint is a database. This means that Service Broker sends and receives data between databases. The endpoint that starts the communication process is known as the initiator, and the endpoint that receives the initial request is known as the target. Once established, communication can flow in both directions. The initiator and target endpoints can be in the same database, in different databases on the same instance, or in databases on different instances or servers. The end result of a Service Broker application is to manage conversations exchanges of data between endpoints. Conversations in Service Broker, just like conversations between people, can be of two different types:
monolog A conversation that occurs from one endpoint to any number of target endpoints. This conversation type is not currently available in SQL Server 2005. dialog A conversation that occurs between exactly two endpoints.
Conversations manage the flow of messages between initiator and target. You would need only this mechanism if resources were always available, always had the capacity to process every message as soon as it arrived, and never failed. But because this is not possible, your applications require a structure to store messages that are submitted so
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