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After defining the starting and ending point of the class code block, the next step is to define the instance variables contained in the class. These variables hold the data that an instance of your class will manipulate. The Private keyword ensures that these instance variables can be manipulated only by the code inside the class. Here are the instance variable definitions: Private Private Private Private Private _empID As Integer _loginName As String _password As String _department As String _fullName As String

exit; } else $this->mLoginMessage = 'Login failed. Please try again:'; } The logout link in admin_menu.tpl simply unsets the admin_logged session variable in admin.php and redirects the administrator to index.php. This way, on the next attempt to access the admin page, the administrator will be redirected to the login page. // If loggin out ... if (isset ($_GET['Page']) && ($_GET['Page'] == 'Logout')) { unset($_SESSION['admin_logged']); header('Location: admin.php'); exit; }

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A major security concern comes into play when we first consider the design of our server. We have many options, as discussed earlier in our text, but we always have to decide which of the three methods of processing we will use: single process, forking, or multithreading. While the first method poses little more risk than we have already discussed, the latter two introduce another level of concern. Anytime we decide to delegate processing to multiple tasks, whether they be forked or threaded, we must also consider what, if any, communication or data needs to be shared between them. For instance, do we need to collect statistics in our child processes or threads Do we need information that only sibling processes or threads will have Do we need to modify our parent process or master thread s state at all

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The department administration section allows the client to add, remove, or change department information To implement this functionality, you ll need to write the necessary code for the presentation, business, and data layers One fundamental truth regarding n-Tiered applications (which also applies to this particular case) is that the business and data tiers are ultimately created to support the presentation tier Drawing on paper and establishing exactly how you want the site to look (in other words, what functionality needs to be supported by the UI) is a good indication of what the database and business tier will contain With the proper design work, you can know exactly what to place in each tier, so the order of writing the code doesn t matter.

If the answer to any of these questions is yes, then we need to deal with some method of sharing data between processes and threads. While it is beyond the scope of this humble text to describe all the available methods, we should examine a very important aspect of a shared data situation. Consider a forking process that uses a shared memory segment. A shared memory segment is a single address in memory shared by more than one process, usually created with a system call similar to shmget(). Now, if we intended the use of this shared data segment as a method of updating some common statistical information say, the number of connections we had serviced then we can look at some pseudo-code to see where a race condition may exist:

When the design is clearly established, a team of programmers can work at the same time and implement the three tiers concurrently, which is one of the benefits of having a tiered architecture However, this rarely happens in practice, except for the largest projects that really need very careful design and planning In our case, usually the best way is to start with the lower levels (the database and data object) to have the basics established before creating the UI For this to happen, first you need to analyze what functionality you ll need for the UI; otherwise, you won t know what to write in the data and business tiers In this chapter, we will always start with the presentation tier You can do this because now you have a good overview of the architecture and know beforehand how you ll implement the other two tiers.

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