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ow that you ve learned the theoretical concepts about messaging and Service Broker architecture, it s time to talk about the actual implementation of Service Broker applications. In this chapter, you ll learn how to write your own Service Broker services and how these services can communicate with each other. I ll cover the following topics in detail: Defining Service Broker applications: A Service Broker application consists of several Service Broker objects, including message types, contracts, a queue, and a service. You ll learn how these objects are related to each other and how you can program them. Sending messages: Once you define your Service Broker application, you re able to send messages between your Service Broker services. You ll learn how to exchange messages successfully. Retrieving and processing messages: As soon as you send messages to another Service Broker service, you must retrieve and process the messages. You ll learn how to retrieve and process the messages and how to react to different message types. Error handling: Every robust software application needs error handling; the same is true with Service Broker. Service Broker provides error-handling possibilities that are directly integrated into the infrastructure provided by Service Broker. You ll learn how to use error handling and how to handle poison messages. Let s start with how to define a Service Broker application.

Article filtering allows overlapping partitions. Occurs when the subset of data is not unique. Article filtering allows overlapping partitions, but updates made at the Subscriber server do not alter the partition for the row. Article filtering produces nonoverlapping partitions, and multiple Subscriber servers can receive the same partition. Article filtering produces nonoverlapping partitions that are unique for each subscription.

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Because this example will use pull subscriptions and we will manually resolve conflicts using the Interactive Resolver, I have set the @allow_interactive_resolver parameter to true. The @subset_filterclause parameter is used to dynamically determine the salesperson at login time by using the SUSER_SNAME() dynamic function for the SalesPerson article. The @source_ owner parameter holds the name of the schema that contains the table, while the @destination_ owner is the owner of the object in the subscription database. For the PriceList article, I have asked the Microsoft SQL Server Maximum Conflict Resolver to calculate the maximum of the column 'Price' should any conflicts arise. The @article_resolver parameter is assigned the value of the Microsoft SQL Server Maximum Conflict Resolver. After adding the articles, the next step is to add the filters and start the Snapshot Agent, as shown in Listing 13-7.

Let s start with a simple Hello World Service Broker application in which you define both the initiator service and the target service in the same database. Because of this, you don t have to bother with security and distributed messaging complications. One limitation of SQL Server 2008 is that you can t manage Service Broker objects through SQL Server Management Studio. There are no wizards for managing message types, contracts, a queue, and a service. You can manage these objects through the T-SQL statements described in this chapter. The only things that SQL Server 2008 provides you with in this area are template scripts that you can use as a beginning point for your Service Broker applications. In addition, you can manage them through SQL Server Management Objects (SMOs), which my coauthor, Remus, will cover in 12 when he discusses administration.

Listing 13-7. Adding the Parameterized and Join Filters and Starting the Snapshot Agent /*Add the merge article join filters on the publication database*/ use [mysales_merge2] go /*Add the join filter to the article AccountsReceivable */ exec sp_addmergefilter @publication = 'pub_stdpub_mysalesmerge2', @article = 'AccountsReceivable', @filtername= 'AccountsReceivable_Customer', @join_articlename = 'Customer', @join_filterclause = '[Customer].[CustID] = [AccountsReceivable].[CustID]', @join_unique_key = 1, @filter_type = 1, @force_invalidate_snapshot = 1, @force_reinit_subscription = 1 Go use [mysales_merge2] go /*Add the join filter to the article OrderHeader */ exec sp_addmergefilter @publication = 'pub_stdpub_mysalesmerge2', @article = 'OrderHeader', @filtername ='OrderHeader_Customer', @join_articlename = 'Customer', @join_filterclause = '[Customer].[CustID] =[OrderHeader].[CustID]', @join_unique_key = 1, @filter_type = 1, @force_invalidate_snapshot = 1, @force_reinit_subscription = 1 Go use [mysales_merge2] go /*Add the join filter to the article Customer */ exec sp_addmergefilter @publication = 'pub_stdpub_mysalesmerge2', @article = 'Customer', @filtername ='Customer_CustSales',

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