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In most cases, there is no single best way to implement the three-tier architecture, and you ll need to make a compromise or a choice based on personal preference or external constraints Furthermore, there are occasions in which even though you know the right way (in respect to the architecture) to implement something, you might choose to break the rules to get a performance gain As a general rule, if performance can be improved this way, it is okay to break the strict limits between tiers just a little bit (for example, add some of the business rules to the data tier or vice versa), if these rules are not likely to change in time Otherwise, keeping all the business rules in the middle tier is preferable because it generates a cleaner application that is easier to maintain.

/* Retrieve socket passed to thread_proc */ sock = (int) arg; /* Turn off Nagle's algorithm*/ setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (char *) &flag, sizeof(int)); /* Set socket to nonblocking */ ioctl(sock, FIONBIO, (char *) &flag);

NOTE Nagle s algorithm is enabled by default in Linux. It attempts to group undersized outgoing packets in order to send them out at once. This can introduce delays by forcing outgoing packets to wait, and it can really cause problems with a client-server application. Since our chat application will send many small packets, we turn off Nagle s algorithm to prevent those delays.

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Finally, don t be tempted to access the data tier directly from the presentation tier This is a common mistake that is the shortest path to a complicated, hard-to-maintain, and inflexible system In many data access tutorials or introductory materials, you ll be shown how to perform simple database operations using a simple user interface application In these kinds of programs, all the logic is probably written in a short, single file, instead of separate tiers Although the materials might be very good, keep in mind that most of these texts are meant to teach you how to do different individual tasks (for example, access a database), and not how to correctly create a flexible and scalable application..

The following scenario was developed for the Purchase Request use case: 1. A purchaser has logged in and has been verified as an employee. 2. The purchaser selects items from the product catalog and adds them to the order request (shopping cart), indicating the number of each item requested. 3. After completing the item selections for the order, the purchaser submits the order. 4. Order request information is updated, and an order ID is generated and returned to the purchaser. From the scenario, you can identify an AddItem method of the Order class that needs to be created. This method will accept a product ID and a quantity and then return the subtotal of the order. The Order class will need to call a method of the OrderItem class, which will create an instance of an order item. You also need a SubmitOrder method of the Order class that will submit the request and the return order ID of the generated order. Figure 4-13 shows the associated sequence diagram for this scenario.

This is our main thread loop. We basically check for commands from the client and then relay any waiting server commands back. We start by calling our readLine() function, which we describe later. It returns a negative value if an error occurred on the socket. If this happens, then we want to remove the client from the room.

{ // Build SQL query $sql = 'SELECT * FROM catalog_get_departments_list();'; // Prepare the statement with PDO-specific functionality $result = DatabaseHandler::Prepare($sql); // Execute the query and return the results return DatabaseHandler::GetAll($result); } } Because it relies on the functionality you ve already included in the DatabaseHandler class and in the database functions in place, the code in Catalog is very simple and straightforward. The GetDepartments method will be called from the presentation tier, which will display the returned data to the visitor. It starts by preparing the SQL query (you learned earlier about the advantages of preparing SQL statements), and then calling the appropriate DatabaseHandler method to execute the query. In this case, we re calling GetAll to retrieve the list of departments. Right now, the database connection is opened when index.php starts processing and is closed at the end. All database operations that happen in one iteration of this file will be done through this connection.

while (!quit) { /* Get any commands that the client has sent */ status = readLine(sock, buffer, MAX_LINE_BUFF); if (status < 0) { /* If we've lost the client then process it as a QUIT. */ if (joined) { quit_command(nickname, return_msg); } return arg;

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