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Unlike an on-demand process, a polling data process (PDP) just keeps running It follows three high-level steps: 1 Check a queue for commands 2 Process the next command 3 Sleep for a predetermined period of time, then go back to step 1 I ll give you three common examples here of using divide and conquer to offload a portion of data processing to the database rather than the presentation or application layer Doing so makes the presentation or application layer appear to be fast and efficient And, since the best place to perform data processing is in the database, the offloaded portion of the larger process is fast and efficient First, let s look at an example with the application layer Let s say you have web or message services that, in turn, update your database whenever there is a transaction on an external system.

require_once BUSINESS_DIR . 'symmetric_crypt.php'; $string = $_GET['my_string']; echo 'The string is:<br />' . $string . '<br /><br />'; $encrypted_string = SymmetricCrypt::Encrypt($string); echo 'Encrypted string: <br />' . $encrypted_string . '<br /><br />'; $decrypted_string = SymmetricCrypt::Decrypt($encrypted_string); echo 'Decrypted string:<br />' . $decrypted_string; } > <br /><br /> <form action="test_encryption.php"> Enter string to encrypt: <input type="text" name="my_string" /><br /> <input type="submit" value="Encrypt" /> </form> 3. Load the newly created test_encryption.php file in your favorite browser and give a string to encrypt/decrypt (see Figure 11-2).

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Rather than tie up the services with the entire business process, you can have your services update a set of staging tables in your database, and then have a polling process on your database wake up every so often and finish processing the staged data A second example is one where you have a long-running process in the presentation layer Let s say you have a security system where an administrator can assign access to worker data based on business organization, location, and so on Rather than tie up the administrator s computer while the mass assignments take place, you can have the presentation layer submit the processing request to your polling process s queue Then, when your polling process wakes up from its sleep period, it will process your long-running request in the background.

Note If the mcrypt library wasn t installed or configured correctly, you ll receive a fatal error about the

Two views are left to create for the Tasks list: Completed Issues and High Priority Issues. These views will be accessed from the Tasks list, not the home page. After creating the views, there are two more tasks to complete before launch: have Brian add an announcement about the purpose of the site, and add the stakeholders as read-only users. The completed SharePoint site shown in Figure 7-10 provides a complete issue tracking solution for Brian and the COS team.

What s the result To the end user using the presentation layer, the application appears easy, fast, and efficient A third example is along the same line of thinking This time, however, you set up your end user s reporting subsystem to submit long-running reports to your polling process s queue, and then have your polling process email the end user with a link (URL) to a completed report when it finishes executing the report in the background Once again, the end user s experience is one where submitting the report is easy, fast, and efficient Using a polling process requires a different design than an on-demand process Instead of logging each time a process executes (which you can still do), you need to create a queue for process and processing-related commands, and possibly a table to hold the current status of the polling process.

Caution As you might have noticed after running the test page, the decrypted string always has a length that is a multiple of 32 bytes. If the original string is less than 32 bytes, null characters are appended until the string s length becomes a multiple of 32 bytes. You need to be careful with this detail because it means the decrypted value of the string may not be identical to the encrypted value. For our HatShop project, because we ll encrypt XML data and the values of interest are between XML tags, we won t need to worry about having additional void characters at the end of the string.

I ll start out by showing you an example of the process method, and then follow up with discussions on each of the supporting methods..

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