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Creating a database master key
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If you already created a master key for the AdventureWorks database in a previous exercise, you can skip these steps because a database is allowed to have only one master key.
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Master keys
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For information about creating database master keys, see 2, Configuring SQL Server 2005.
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Service Broker provides the infrastructure needed to build reliable, secure, and scalable messaging applications.
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Lesson 1: Exploring the Service Broker Architecture
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Service Broker conversations enable applications to interact with Service Broker services, which are attached to each message queue. Services validate messages that are sent to the queue by enforcing contracts and message types. After a message has passed this validation, the service places the message on a queue, where it can be processed by a background task.
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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. Which of the following are valid Service Broker objects (Choose all that apply.) A. dialog B. conversation C. queue D. message
20
Working with Service Broker
Lesson 2: Creating Message Types and Contracts
For any communication to succeed, both parties must agree on the acceptable format of the information being exchanged. People accomplish this task without conscious thought. If a question is asked in Spanish, the response that provides the information requested is also in Spanish. If that same question were asked in English, the response would be returned in English. However, if the person asking the question were speaking French and the person being asked understood only German, communication would fail. In Service Broker, message types ensure reliable communication by enforcing an agreed-upon format for message content that is transmitted between two endpoints. Contracts, in turn, control the message types that are allowed within a conversation, defining both the acceptable input and the acceptable output that will be returned. In this lesson, you will see how to create message types and contracts to define appropriate communication between application components.
After this lesson, you will be able to:
Create message types. Create a contract.
Estimated lesson time: 15 minutes
Creating Message Types
A message type is composed of two key components: name and validation. The generic form of the command to create a message type is as follows:
CREATE MESSAGE TYPE message_type_name [ AUTHORIZATION owner_name ] [ VALIDATION = { NONE | EMPTY | WELL_FORMED_XML | VALID_XML WITH SCHEMA COLLECTION schema_collection_name } ]
The message_type_name clause can be any name that is valid for an identifier. However, you will want to carefully consider each name that you create. Service Broker applications communicate between two databases that are usually on different instances. You will want to ensure that each message type name is globally unique, so developers usually name them by using a URL. The AUTHORIZATION clause specifies the owner of the message type.
Lesson 2: Creating Message Types and Contracts
The VALIDATION clause specifies whether messages are validated or not when they are submitted. All Service Broker messages have a data type of VARBINARY(MAX). However, messages can be composed of up to 2 gigabytes of data that doesn t have to meet any specific requirements. Table 20-1 describes the validation options that are available for a message type.
Table 20-1 Validation Options for Message Type
Option EMPTY NONE WELL_FORMED_XML VALID_XML WITH SCHEMA COLLECTION
Description Forces the message body to contain no data. The message body can contain any data in any format. The message body is allowed to be only a wellformed XML document. The message body must be a well-formed XML document, and the document must conform to one of the schemas in the specified schema collection.
When you specify a validation method of either WELL_FORMED_XML or VALID_XML WITH SCHEMA COLLECTION, the message is loaded into an XML parser and validated when it arrives at either endpoint. This parser validation can add overhead in the processing. If your Service Broker application accepts messages from external sources that you cannot control, you usually specify one of these options. However, if you control all the applications that are creating messages, or your application includes code to handle various messages, you will want to specify NONE to eliminate the parser overhead. Here is an example message type statement specifying a URL name for the message type and the validation option VALID_XML WITH SCHEMA COLLECTION:
CREATE MESSAGE TYPE [http://broker. SolidQualityLearning.com/test/CheckClasses] VALIDATION = VALID_XML WITH SCHEMA COLLECTION [http://broker.SolidQualityLearning.com/test/CourseSchemas]
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