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This system has the advantage of not needing manual maintenance Because at this point HatShop retains what products were sold, you will implement a customers who bought this product also bought feature in this chapter..

With the ability to determine whether or not we have a key for the current host, we also need to read that key from disk. We do this through the

The ability to overload methods is a useful feature of OOP languages. You overload methods in a class by defining multiple methods that have the same name but contain different signatures. A method signature is a combination of the name of the method and its parameter type list. If you change the parameter type list, you create a different method signature. For example, the parameter type lists can contain a different number of parameters or different parameter types. The compiler will determine which method to execute by examining the parameter type list passed in by the client.

In HatShop, you ll implement the dynamic recommendations system in the visitor s shopping cart and in the product details page. After adding the new bits to your shop, the product details page will contain the product recommendations list at the bottom of the page, as shown in Figure 10-1.

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RSA *getServerKey(const char *host, const char *username) { char *file_path = NULL; const char *user_home = NULL; RSA *my_key = NULL; if((user_home = getUsersHome(username)) == NULL) { report_error_q("Unable to find user's home directory",__FILE__,__LINE__,0); } file_path = (char *)w_malloc(strlen(host) + strlen(user_home) + 15); strncpy(file_path,user_home,strlen(user_home)); strncat(file_path,"/.",2); strncat(file_path,host,strlen(host)); strncat(file_path,".priv",strlen(".priv")); my_key = key_read_priv(file_path); w_free(file_path); return my_key; }

The last bit of functionality we want to encapsulate before we begin implementing the main() function is the ability to prompt the user for a password. Prompting a user for input can be relatively easy; however, when a user types a password, we should turn off the echo in his terminal (or at least attempt to), so that his password is not shown on the screen for any passing eyes to see. Therefore, we combine turning off the terminal echo and the prompt into a single function, getUserPassword(), which returns the password the user enters.

Figure 10-1. The product details page with the dynamic recommendations system implemented The shopping cart page gets a similar addition, as shown in Figure 10-2.

const char *getUserPassword(void) { struct termios terminal_setup, old_terminal_setup; static char *password_buffer[2048]; char *newline = NULL; memset(password_buffer,'\0',2048); tcgetattr(STDIN_FILENO, &terminal_setup); old_terminal_setup = terminal_setup; terminal_setup.c_lflag &= ~ECHO; terminal_setup.c_lflag |= ECHONL; tcsetattr(STDIN_FILENO, TCSAFLUSH, &terminal_setup);

Before writing any code, you first need to understand the logic you ll implement for making product recommendations. We ll focus here on the logic of recommending products that were ordered together with another specific product. Afterward, the recommendations for the shopping cart page will function in a similar way but will take more products into consideration. So, you need to find out what other products were bought by customers who also bought the product for which you re calculating the recommendations (in other words, determine the customer who bought this product also bought information). Let s develop the SQL logic to achieve the list of product recommendations step by step.

10

Note Changing how a parameter is passed (in other words, from byVal to byRef) does not change the method signature. Altering the return type of the method also does not create a unique method signature. For a more detailed discussion of method signatures and passing arguments, refer to Appendix A.

Because SQL is very powerful, you can actually implement the same functionality in several ways. Tip

The required callbacks include a set each for static and dynamic thread allocation. The choice of which to use is highly dependent on the library itself and how it was compiled. It is recommended that callbacks for both methods be provided to produce code that is compatible with both older and newer versions of the OpenSSL library.

A callback is a function defined in our program that is provided for use by a library. The library can then call our function to perform tasks that only we know how to do.

Here, we ll cover just one of the options, but when implementing the actual database functions, you ll be shown other options as well.

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