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Next we come to the order processing itself. The model used here checks the Boolean ContinueNow field before processing a pipeline section. This allows sections to specify either that processing should continue when they re finished with the current task (by setting ContinueNow to true) or that processing should pause (by setting ContinueNow to false). This is necessary because you need to wait for external input at certain points along the pipeline, such as checking whether stock is available. The pipeline section to process is selected by the private GetCurrentPipelineSection method, which eventually selects a section based on the status of the order, but currently just has the job of setting the CurrentPipelineSection field to an instance of PSDummy: private void GetCurrentPipelineSection() { // select pipeline section to execute based on order status // for now just provide a dummy CurrentPipelineSection = new PSDummy(); } Back to Process, you see this method being called in a try block: // process pipeline section try { while (ContinueNow) { ContinueNow = false; GetCurrentPipelineSection(); Note that ContinueNow is set to false in the while loop the default behavior is to stop after each pipeline section.





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In the section about disconnected data access, you learned that ADO.NET offers a way to work with disconnected data via the DataSet class. The DataSet needs to be populated from the data residing in the data source. Similarly, after you are finished with the data modifications, the data needs to be updated in the underlying data source, and the DataAdapter class is designed just for that. Note that the DataSet class is the same for any kind of data provider (SQL or OLEDB), but DataAdapter has separate implementations (SqlDataAdapter and OleDbDataAdapter). This is because, unlike DataSet, which is totally unaware of the underlying data source, DataAdapter needs to communicate with the underlying data source.





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After you have a pipeline section, you need to process it. All sections support the simple IPipelineSection interface, defined as follows: public interface IPipelineSection { void Process(OrderProcessor processor); } All pipeline sections use a Process method to perform their work, and this method requires an OrderProcessor reference because the pipeline sections need access to the order and customer details exposed by the order processor. The last part of the while loop (and try block) in OrderProcessor calls this method: CurrentPipelineSection.Process(this); } } This calls the Process method in PSDummy, which we ll come back to shortly. The last part of the Process method in OrderProcessor involves catching exceptions, which might be OrderProcessorException instances or other exception types. In either case, you send an email to the administrator using the MailAdmin method (we ll cover this in a little while), add an audit entry, and throw a new OrderProcessorException that can be caught by users of the OrderProcessor class: catch (OrderProcessorException ex) { MailAdmin("Order Processing error occurred.", ex.Message, ex.SourceStage); CreateAudit("Order Processing error occurred.", 10002); throw new OrderProcessorException( "Error occurred, order aborted. " + "Details mailed to administrator.", 100); } catch (Exception ex) { MailAdmin("Order Processing error occurred.", ex.Message, 100); CreateAudit("Order Processing error occurred.", 10002); throw new OrderProcessorException( "Unknown error, order aborted. " + "Details mailed to administrator.", 100); } Regardless of whether processing is successful, you add a final audit entry saying that the processing has completed: finally { CommerceLibAccess.CreateAudit(Order.OrderID, "Order Processor finished.", 10001); } }

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Toward the end of this book, we ll review the most common mistakes and how they should be addressed. In addition, you will find many references to helpful Blogger and blogging sites including how to improve your blog, search engine optimization tips, HTML help, and more.

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