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catch (WebException we) { incomingResponse = we.Response as HttpWebResponse; m_lastError = we.Message; if (incomingResponse != null) return MatchResponseFilter(incomingResponse); return ResponseFilterAction.Retry; } catch (InvalidOperationException ioe) { incomingResponse = null; m_lastError = ioe.Message; return ResponseFilterAction.Error; } } In Listing 10-12, the MatchResponseFilter method is called when the GetResponse method of the HttpWebRequest class is called. Internally, the MatchResponseFilter method calls the sp_MatchResponseFilter stored procedure to retrieve the response filter from the ResponseFilter table. Refer to Listing 10-3 for the implementation details of this stored procedure. In the error case, the TryWebRequest method returns the ResponseFilterAction.Error enumeration value. This indicates to the caller that the web service request wasn t completed successfully. In this case, the web service request is queued for a retry. You implement the queuing mechanism for a retry in the SavePendingRequest method. You ll learn about the retry mechanism later in this section. When the web service request completes successfully, a response message with the web service result is sent to the initiator of the conversation. Finally, the conversation is ended. You use the SendResponse method to send the result, and you use the EndConversation method to end the conversation. Listing 10-13 shows the SendResponse method. Listing 10-13. Implementation of the SendResponse Method private void SendResponse(httpResponseType outgoingResponse) { MemoryStream msgBody = new MemoryStream(); XmlSerializer xs = new XmlSerializer(typeof(httpResponseType)); xs.Serialize(msgBody, outgoingResponse); Message msgResponse = new Message(x_httpResponseMessageType, msgBody); s_currentConversation.Send(msgResponse, s_connection, s_transaction); } After sending the response message and ending the conversation, the whole process of executing the web service request is complete. Let s concentrate now on the implementation details of the retry mechanism. As soon as an error is returned from the TryWebRequest method, the retry mechanism does the following two things:

The steps that you need to take for push subscriptions for immediate updating are similar to those for pull subscriptions, except for the execution of some stored procedures: 1. Verify that the publication supports immediate updating subscriptions. 2. Verify that the publication supports push subscriptions. 3. Add the push subscription on the Publisher server. 4. Add the push subscription agent on the Publisher server. 5. Configure the security information used by the synchronization triggers. We have already verified that the publication supports immediate updating subscriptions and push subscriptions in Listing 9-9. Listing 9-14 shows the remaining steps. Listing 9-14. Adding the Push Subscription and Agent, and Configuring the Triggers Security Settings /* Execute this code on the publication database on the Publisher */ use mysales_copy go /* Add the push subscription on the Publisher */ exec sp_addsubscription @publication = 'pub_updsub_mysales_copy', @subscriber = 'BIOREPL\BIOREPL_PEER', @destination_db = 'mysalescopy_upd_remotepush', @subscription_type = 'Push', @sync_type = 'automatic', @article = 'all', @update_mode = 'failover', @subscriber_type = 0 go

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Saves the request: The retry mechanism stores the failed web request in the PendingRequest table. Then it retries the pending web request until the configured maximum value is reached (which is stored in the NumberOfRetries column in the RequestFilter table). Starts a dialog timer: Finally, a Service Broker dialog timer is started. A dialog timer sends a message after a configured period of time. When the service program receives this dialog timer message, the execution of the pending web request is tried again. Let s have a look at each of these two points. The PendingRequest table stores all the web requests that weren t executed successfully. These web requests are retried again as soon as the service program receives the associated dialog timer message. Listing 10-14 shows the CREATE TABLE T-SQL statement for this table. Listing 10-14. The CREATE TABLE T-SQL Script for the PendingRequest Table CREATE TABLE PendingRequest ( ConversationHandle UNIQUEIDENTIFIER NOT NULL CONSTRAINT PkPendingRequest PRIMARY KEY, RequestBody VARBINARY(MAX) NOT NULL, RetriesUsed TINYINT NOT NULL, Status NVARCHAR(MAX) ) GO PendingRequest stores the conversation handle that is associated with the failed web service request. The table also stores the number of retries already executed. Therefore, you can easily determine how many retries are still left. You use the sp_AddOrUpdatePendingRequest stored procedure to insert the pending web service request. Listing 10-15 shows the implementation of this stored procedure. Listing 10-15. Implementation of the sp_AddOrUpdatePendingRequest Stored Procedure CREATE PROCEDURE sp_AddOrUpdatePendingRequest @ConversationHandle UNIQUEIDENTIFIER, @RequestBody VARBINARY(MAX), @RetriesUsed TINYINT, @Status NVARCHAR(256) AS BEGIN BEGIN TRANSACTION; IF (EXISTS ( SELECT * FROM PendingRequest WHERE ConversationHandle = @ConversationHandle ))

/* Add the push subscription agent on the Publisher server */ exec sp_addpushsubscription_agent @publication = 'pub_updsub_mysales_copy', @subscriber = 'BIOREPL\BIOREPL_PEER', @subscriber_db = 'mysalescopy_upd_remotepush',

@job_login = null, @job_password = null, @subscriber_security_mode = 1, @frequency_type = 64, @frequency_interval = 0, @frequency_relative_interval = 0, @frequency_recurrence_factor = 0, @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 /* Configure the security information using sp_link_publication on the Subscriber server*/ use mysalescopy_upd_remotepush go exec sp_link_publication @publisher = 'BIOREPL\BIOREPL_PEER', @publisher_db = 'mysales_copy', @publication = 'pub_updsub_mysales_copy', @distributor = 'BIOREPL\BIOREPL_PEER',

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