Kỳ 3: Factory Pattern và Singleton Pattern
Ở bài viết trước chúng ta đã làm quen với khái niệm Design Pattern – Mẫu thiết kế trong lập trình PHP, giúp cho việc tổ chức code logic hơn, dễ bảo trì và mở rộng hơn. Adaptor Pattern được lựa chọn để giới thiệu đầu tiên, không vì lý do gì cả. Đơn giản chỉ là vì nó phù hợp nhất với tình huống mẫu trong chủ đề này – xây dựng một Gian hàng trực tuyến, và rõ ràng module Thanh toán chính là chức năng quan trọng nhất của một gian hàng.
1 – Factory Pattern
OK! Chúng ta đã có rất nhiều module thanh toán, mỗi module cài đặt cho một loại phương thức giao dịch khác nhau: Paypal, 2Checkout, Authorize.net, LR… Người dùng có thể tùy ý lựa chọn một loại phương thức giao dịch và ứng dụng phải dễ dàng chấp nhận nó cho thao tác thanh toán. Với mỗi phương thức thanh toán, tiến trình khởi tạo của các đối tượng PaymentGateway (như Paypal, Twoco…) hoàn toàn khác nhau, trong khi chúng ta mong muốn có một handler để nắm giữ một phương thức thanh toán người dùng lựa chọn để sử dụng cho tiến trình thanh toán giao dịch:
Sử dụng Factory Pattern, tức là chúng ta sẽ tạo ra 1 lớp (hoặc một phương thức) dùng để sinh ra các đối tượng khác nhau phụ thuộc vào tham số đầu vào. Điều này là cần thiết khi chúng ta cần tạo ra một đối tượng mà quá tiến trình khởi tạo phải có những bước thiết đặt khác nhau (thực hiện một chuỗi lệnh, hoặc load các objects hỗ trợ khác, hoặc thiết đặt giá trị cho một số biến…).
function getPaymentGateway($type)
{
switch($type) {
case ‘Paypal’:
return new Palpay();
case ‘Twoco’:
return new Twoco();
…
}
}
Hoặc nếu tên class đã được “chuẩn hóa”, thì đơn giản chỉ là:
function getPaymentGateway($type)
{
return new $type();
}
Và khi người dùng lựa chọn một phương thức thanh toán của họ, chúng ta chỉ cần gọi hàm getPaymentGateway() để tạo ra một đối tượng nắm giữ module thanh toán của phương thức đó.
$paymentHandler = getPaymentGateway(‘Paypal’);
Chúng ta có thể sử dụng $paymentHandler này cho các chức năng giao dịch khác mà không cần phải quan tâm lựa chọn của người dùng là gì.
$paymentHandler->submitPayment();
3 – Singleton Pattern và Giỏ hàng
Một chức năng quan trọng khác của một gian hàng, đó là bạn cần tạo ra một Giỏ hàng cho người mua. Giỏ hàng phải có các đặc tính:
- Thêm, loại bỏ, thay đổi số lượng… sản phẩm.
- Tính toán giá thành và thanh toán giỏ hàng.
- Mỗi người mua chỉ có một giỏ hàng.
Giỏ hàng sẽ được lưu lại trên session hoặc lưu trực tiếp vào database, và chúng ta chú ý ở đặc điểm thứ 3 – mỗi người dùng chỉ được cung cấp một Giỏ hàng cho việc lưu giữ các sản phẩm đã lựa chọn. Như vậy trong quá trình khởi tạo Giỏ hàng, chúng ta sẽ phải chuẩn bị các thiết đặt về cấp phát như: thiết đặt các giá trị lên session hoặc khởi tạo kết nối database. Nếu ta định nghĩa Giỏ hàng dưới một class thông thường: Cart, thì mỗi lần sử dụng Giỏ hàng sẽ phải tạo ra một đối tượng Cart khác nhau:
$cart1 = new Cart(); $cart2 = new Cart();
Trong chương trình, $cart1 và $cart2 là hai đối tượng hoàn toàn khác nhau, mặc dù chúng có thể sử dụng cùng một session hoặc database để lưu/đọc thông tin về sản phẩm. Và mỗi lần sử dụng toán tử new, chúng lại phải thực hiện các bước khởi tạo, cấp phát. Chúng ta cũng có thể nghĩ đến chuyện sử dụng biến toàn cục – global variables cho các handler mà không cần phải khởi tạo nhiều lần, tuy nhiên global variables là giải pháp nghèo nàn của PHP4 và nó có những nhược điểm sẽ được nói tới ở cuối bài.
Những điều trên dẫn đến ý tưởng sử dụng Singleton Pattern, cho phép tạo ra và duy trì một instance duy nhất của một class trong chương trình.
class Cart
{
private static $instance = false;
private $items = array();
private db_connection;
public $total = 0;
private function __construct()
{
// Initilizing a database connection
}
private function __clone() {}
public static function getInstance()
{
if(self::$instance === false)
{
self::$instance = new Cart;
}
return self::$instance;
}
public function add($item)
{
$this->items[] = $item;
// Sync to database use db_connection
}
public function total()
{
foreach ($this->items as $item)
{
$this->total += $item['price'];
}
return $this->total;
}
}
Và một đoạn mã nhỏ để test Giỏ hàng của chúng ta:
$cart1 = Cart::getInstance();
$cart2 = Cart::getInstance();
$item = array(
'id' => 'sku_123ABC',
'qty' => 1,
'price' => 39.95,
'name' => 'T-Shirt',
'options' => array('Size' => 'L', 'Color' => 'Red')
);
$cart1->items[] = $item;
print_r($cart2->items);
echo "Total: ".$cart2->total();
Kết quả sẽ là:
Array ( [id] => sku_123ABC [qty] => 1 [price] => 39.95 [name] => T-Shirt [options] => Array ( [Size] => L [Color] => Red ) )
Total: 39.95
Với output như trên chúng ta có thể hiểu là $cart1 và $cart2 trong chương trình là một, chúng sử dụng chung một thuộc tính db_connection để giữ kết nối tới database, và cập nhật thông tin sản phẩm khi người dùng thêm/sửa/xóa giỏ hàng. Ở ví dụ này chú ý rằng các phương thức __construct(), __clone được đặt private, để ngăn chặn việc tạo ra một instance của Cart trực tiếp thông qua toán tử new, hoặc clone thông qua toán tử clone (sinh ra lỗi Fatal Error).
{!} Thay thế biến toàn cục – Global Variables
Trong PHP5, Singleton thường được dùng để thay thế cho việc sử dụng biến toàn cục, bởi vì biến toàn cục có những nhược điểm sau:
- Nó có thể bị thay đổi ở bất cứ chỗ nào trong chương trình, rất khó cho quá trình debug.
- Nó hủy hoại các namespace, bởi vì nếu bạn sử dụng một biến toàn cục trùng tên với biến toàn cục của một namespace nào đó sử dụng trong chương trình, chúng được coi là một và dễ dàng bị xung đột – conflict (sự thay đổi của biến này được áp dụng cho biến kia).
Và rất nhiều tội lỗi khác của Global Variables được kể ra ở đây. Sử dụng Singleton có thể giúp thay thế việc sử dụng biến toàn cục trong chương trình và khắc phục các nhược điểm kể trên:
class Globals {
private static $vars = array();
public function __construct() {}
public static function __get($name)
{
if(array_key_exists($name, self::$vars)) {
return self::$vars[$name];
}
}
public static function __set($name, $value)
{
self::$vars[$name] = $value;
}
}
Như vậy khi ở trong chương trình chúng ta muốn có sự xuất hiện của một biến toàn cục, có thể sử dụng cách sau để thay thế:
// Tạo ra một đối tượng Globals $globals = new Globals; // Khai báo một biến toàn cục $globals->store_name = "Killer Shop"; // Gọi biến toàn cục echo $globals->store_name; // Kiểm tra tính toàn cục bằng một instance khác $another = new Globals; // Output vẫn là “Killer Shop” echo $another->store_name;
Tags: cart, design pattern, oop, php5, shopping
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