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local queue, the OnTimer method gets called automatically through the functionality of the ServiceBrokerInterface managed assembly. Listing 10-19 shows the implementation of the OnTimer method. Listing 10-19. Implementation of the OnTimer Method [BrokerMethod(Message.DialogTimerType)] public void OnTimer( Message msgReceived, SqlConnection connection, SqlTransaction transaction) { s_connection = connection; s_transaction = transaction; s_currentConversation = msgReceived.Conversation; s_msgReceived = msgReceived; httpRequestType pendingRequest = GetPendingRequest(); if (pendingRequest == null) { ErrorConversation(6, "Your pending request was mysteriously lost."); return; } SqlContext.Pipe.Send("retrieved: " + pendingRequest.url); SqlContext.Pipe.Send("num used: " + m_numRetriesUsed); ServiceRequest(pendingRequest); } As you can see, the OnTimer method uses the GetPendingRequest method to retrieve the pending web service request from the PendingRequest table. When the web service request is retrieved, it is handed over to the ServiceRequest method (see Listing 10-9 for reference), which tries to execute the web service request. Listing 10-20 shows the implementation of the GetPendingRequest method. Listing 10-20. Implementation of the GetPendingRequest Method private httpRequestType GetPendingRequest() { SqlCommand cmd = s_connection.CreateCommand(); cmd.CommandText = @"SELECT RequestBody, RetriesUsed FROM PendingRequest WHERE " + "ConversationHandle = @ConversationHandle"; cmd.Transaction = s_transaction; cmd.Parameters.AddWithValue("@ConversationHandle", s_currentConversation.Handle); SqlDataReader reader = cmd.ExecuteReader();

@frequency_subday = 0, @frequency_subday_interval = 0, @active_start_time_of_day = 0, @active_end_time_of_day = 235959, @active_start_date = 20060108, @active_end_date = 99991231, @enabled_for_syncmgr = 'False' go /* Add the sp_link_publication since the subscription has the @update_mode parameter Set to 'queued failover' */ /* Execute this on the subscription database on the Subscriber server */ use mysalescopy_qud_remotepush go exec sp_link_publication @publisher = 'BIOREPL\BIOREPL_PEER', @publisher_db = 'mysales_copy', @publication ='pub_updsub_mysales_copy', @distributor = 'BIOREPL\BIOREPL_PEER', @security_mode = 0, @login = 'sa', @password = null go The @update_mode parameter in the preceding script has been set to queued failover in the sp_addsubscription stored procedure. This enables support for queued updating, with immediate updating as a failover option. Because I have set the parameter to this value, I have to execute the sp_link_publication stored procedure to configure the security settings of the triggers. Now that you know how to set up the push subscription for queued updating, it s time to learn how to configure pull subscriptions.

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if (!reader.Read()) { reader.Close(); return null; } SqlBytes requestBytes = reader.GetSqlBytes(0); XmlSerializer xs = new XmlSerializer(typeof(httpRequestType)); httpRequestType pendingRequest = xs.Deserialize(requestBytes.Stream) as httpRequestType; m_numRetriesUsed = (int) reader.GetByte(1); reader.Close(); return pendingRequest; } In Listing 10-20, the retry mechanism retrieves the pending web service from the PendingRequest table. As soon as the web service request is retrieved, the request is deserialized to an object of the httpRequestType type. The newly created object instance is finally returned to the caller that hands the pending request over to the ServiceRequest method for further execution. Listing 10-21 shows how to register the managed service program inside the database. Be sure to load the ServiceBrokerInterface.dll assembly from the correct path in your file system. Listing 10-21. Registration of the Managed Service Program CREATE ASSEMBLY [ServiceBrokerInterface] FROM 'c:\ServiceBrokerInterface.dll' WITH PERMISSION_SET = EXTERNAL_ACCESS GO CREATE ASSEMBLY [WebProxy] FROM 'c:\WebProxy.dll' WITH PERMISSION_SET = EXTERNAL_ACCESS; GO CREATE ASSEMBLY [WebProxy.XmlSerializers] FROM 'c:\WebProxy.XmlSerializers.dll' WITH PERMISSION_SET = EXTERNAL_ACCESS; GO CREATE PROCEDURE sp_WebProxyService AS EXTERNAL NAME [WebProxy].[Microsoft.Samples.SqlServer.WebProxyService].Run GO

The steps in configuring the pull subscription for queued updating are as follows: 1. Verify that the publication supports queued updating subscriptions. 2. Verify that the publication supports pull subscriptions. 3. Add the pull subscription on the Subscriber server. 4. Add the pull subscription agent on the Subscriber server. 5. Add the subscription on the Publisher server.

Dyno Technologie s combined sales and marketing departments total 65 employees. There is a clear recognition that, for this project to work, all the staff must be committed to capturing the data required for the dashboard but not every team member needs to be a part of defining the KPIs. As a result, Dyno has established a team made up of an executive sponsor (the chief financial officer), the sales vice president, one key sales manager, one leading sales representative, the marketing manager, and the IT director. This team of seven is small enough to meet regularly but includes relevant resources from each key department that must sign off that the KPIs established are the right metrics to measure and that the end scorecard is technically feasible. The key takeaway here is that, in order for the team to get off the ground, it must have executive support; have representative support from sales, marketing, and IT; and be nimble enough to actually hold multiple working sessions within a relatively short period of time (e.g., four to six weeks).

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