c# code 39 barcode IMPLEMENTING THE ORDER PIPELINE: PART I in C#

Generating Code39 in C# IMPLEMENTING THE ORDER PIPELINE: PART I

CHAPTER 13 IMPLEMENTING THE ORDER PIPELINE: PART I
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10000 is the message number to store for the audit entry. We'll look at these codes in more detail
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Next you come to the order processing itself. The model used here is to check the Boolean $mContinueNow 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 $mContinueNow to true) or that processing should pause (by setting $mContinueNow to false). This is necessary because you need to wait for external input at certain points along the pipeline when checking whether the products are in stock and whether the funds are available on the customer s credit card. The pipeline section to process is selected by the private GetCurrentPipelineSection method, which eventually returns a pipeline section class (you ll build these classes in the next chapter) corresponding to the current status of the order. However, at this moment, the GetCurrentPipelineSection has the job of setting the process stage and returning an instance of PsDummy. In the next chapter, you ll implement classes representing each pipeline section, and you ll return one of those classes instead of PsDummy. // Gets current pipeline section private function GetCurrentPipelineSection() { $this->_mOrderProcessStage = 100; $this->_mCurrentPipelineSection = new PsDummy(); } Back to Process(), you see this method being called in a try block: // Process pipeline section try { while ($this->mContinueNow) { $this->mContinueNow = false; $this->GetCurrentPipelineSection(); $this->_mCurrentPipelineSection->Process($this); } } Note that $mContinueNow is set to false in the while loop the default behavior is to stop after each pipeline section. However, the call to the Process method of the current pipeline section class (which receives a parameter of the current OrderProcessor instance, thus having access to the $mContinueNow member) changes the value of $mContinueNow back to true, in case processing should go to the next pipeline section without waiting for user interaction. Note that in the previous code snippet, the Process method is called without knowing what kind of object $this->_mCurrentPipelineSection references. Each pipeline section is represented by a different class, but all these classes need to expose a method named Process. When such behavior is needed, the standard technique is to create an interface that defines the common behavior you need in that set of classes.
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CHAPTER 13 IMPLEMENTING THE ORDER PIPELINE: PART I
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All order pipeline section classes support the simple IPipelineSection interface, defined as follows: < php interface IPipelineSection { public function Process($processor); } >
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Note An interface is a set of method signatures that serves as a contract for classes that implement that
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interface. When a class implements an interface, the class guarantees that it will implement every signature defined in that interface. An interface cannot be instantiated like a normal class because it doesn t contain any method implementations, only their signatures. By implementing IPipelineSection in all order pipeline section classes (you ll write them in the next chapter), you guarantee that they all will export a public method named Process. This way, you can safely call the Process method on any pipeline section class from your OrderProcessor class without the risk of generating an error.
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All pipeline sections use a Process method to perform their work. This method requires an OrderProcessor reference as a parameter because the pipeline sections need access to the public fields and methods exposed by the OrderProcessor class. The last part of the Process method in OrderProcessor involves catching exceptions. Here, you catch any exceptions that may be thrown by the order pipeline section classes and react to them by sending an email to the administrator using the MailAdmin method, adding an audit entry, and throwing a new exception that can be caught by PHP pages that use the OrderProcessor class: catch(Exception $e) { $this->MailAdmin('Order Processing error occurred.', 'Exception: "' . $e->getMessage() . '" on ' . $e->getFile() . ' line ' . $e->getLine(), $this->_mOrderProcessStage); $this->CreateAudit('Order Processing error occurred.', 10002); throw new Exception('Error occurred, order aborted. ' . 'Details mailed to administrator.'); } Regardless of whether processing is successful, you add a final audit entry saying that the processing has completed: $this->CreateAudit('Order Processor finished.', 10001); }
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