barcode generator source code in c#.net IMPLEMENTING THE ORDER PIPELINE: PART I in C#

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CHAPTER 13 IMPLEMENTING THE ORDER PIPELINE: PART I
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$tax_amount = round((float)$total_cost * (float)$this->mOrderInfo['tax_percentage'], 2) / 100.00; $order_details .= 'Tax: ' . $this->mOrderInfo['tax_type'] . ', $' . number_format($tax_amount, 2, '.', '') . $new_line; $total_cost += $tax_amount; } $order_details .= $new_line . 'Total order cost: $' . number_format($total_cost, 2, '.', ''); return $order_details; }
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You ve begun to build the backbone of the application, and prepared it for the lion s share of the order pipeline processing functionality, which you ll implement in the next chapter. Specifically, we ve covered Modifications to the HatShop application to enable your own pipeline processing The basic framework for your order pipeline The database additions for auditing data and storing additional required data in the orders table In the next chapter, you ll go on to fully implement the order pipeline.
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Implementing the Order Pipeline: Part II
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n the previous chapter, you completed the basic functionality of the OrderProcessor class, which is responsible for moving orders through the pipeline stages. You ve seen a quick demonstration of this using a dummy pipeline section, but you haven t yet implemented the pipeline discussed at the beginning of the previous chapter. In this chapter, you ll add the required pipeline sections so that you can process orders from start to finish, although you won t be adding full credit card transaction functionality until the next chapter. We ll also look at the web administration of orders by modifying the order admin pages added earlier in the book to take into account the new order-processing system.
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Implementing the Pipeline Sections
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In the previous chapter, you completed the OrderProcessor class, except for one important section the pipeline stage selection. Rather than forcing the processor to use PsDummy (the class you used instead of the real pipeline section classes that you ll build in this chapter), you actually want to select one of the pipeline stages outlined in 13, depending on the status of the order. Let s run through the code for each of the pipeline sections in turn, which will take you to the point where the order pipeline will be complete, apart from actual credit card authorization that you ll implement in 15. You ll implement eight new classes with the following names: PsInitialNotification PsCheckFunds PsCheckStock PsStockOk PsTakePayment PsShipGoods PsShipOk PsFinalNotification
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CHAPTER 14 IIMPLEMENTING THE ORDER PIPELINE: PART II
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We ll discuss the classes you re creating as we go. Before moving on, remember that this code is available in the Source Code/Download section of the Apress web site (http://www. apress.com).
PsInitialNotification
This is the first pipeline stage, which is responsible for sending an email to the customer confirming that the order has been placed. Create a new file named ps_initial_notification.php in the business folder, and start adding code to it as shown here. This class starts off in what will soon become a very familiar fashion: < php class PsInitialNotification implements IPipelineSection { private $_mProcessor; public function Process($processor) { // Set processor reference $this->_mProcessor = $processor; // Audit $processor->CreateAudit('PsInitialNotification started.', 20000); The class implements the IPipelineSection interface, then a private field for storing a reference to OrderProcessor that invoked the PsInitialNotification, and finally the Process method implementation. This method starts by storing the reference to OrderProcessor, which some of your pipeline sections will do because using the methods it exposes (either in the Process method or in other methods) is essential. We also add an audit entry using the numbering scheme introduced in 13 (the initial 2 indicates it s coming from a pipeline section, the next 00 shows that it s the first pipeline section, and the final 00 means that it s the start message for the pipeline section). The remainder of the Process method sends the notification email. This requires information from the customer, which you have easy access to. You also use a private method to build a message body, which we ll look at shortly: // Send mail to customer $processor->MailCustomer('HatShop order received.', $this->GetMailBody()); The mail is sent, you add an audit message and change the status of the order, and tell the order processor that it s okay to move straight on to the next pipeline section: // Audit $processor->CreateAudit('Notification e-mail sent to customer.', 20002); // Update order status $processor->UpdateOrderStatus(1); // Continue processing
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