{"id":9268,"date":"2020-11-16T17:40:43","date_gmt":"2020-11-16T08:40:43","guid":{"rendered":"https:\/\/www.gigas-jp.com\/appnews\/?p=9268"},"modified":"2020-11-16T14:42:06","modified_gmt":"2020-11-16T05:42:06","slug":"facade-design-pattern","status":"publish","type":"post","link":"https:\/\/www.gigas-jp.com\/appnews\/archives\/9268","title":{"rendered":"Facade Design Pattern"},"content":{"rendered":"\n

Facade is an structural design style that provides a simplified interface for a library, framework, or any other complex set of classes.<\/p>\n\n\n\n

Let’s say you need to make your code work with a broad set of objects belonging to a sophisticated library or framework. This typically involves initializing all of these objects, tracking dependencies, executing methods in the correct order, and so on.<\/p>\n\n\n\n

As a result, the business logic of the class is tightly coupled with the implementation details of the third-party class, making it difficult to understand and maintain.<\/p>\n\n\n\n

Facade is a class that provides a simple interface to a complex subsystem containing many moving parts. Facades can provide limited functionality compared to working directly with subsystems. However, this only includes features that the client really cares about.<\/p>\n\n\n\n

Lets look at the examples as below.<\/p>\n\n\n\n

PHP Sample Code<\/h3>\n\n\n\n
<?php\n\n\/\/ 3rd party module classes\nclass Kitchen\n{\n    public function cook()\n    {\n        echo \"cooking order\";\n    }\n}\n\nclass Cashier\n{\n    public function bill()\n    {\n        echo \"printing bill\";\n    }\n}\n\n\n\/\/Waiter facade hiding the complexity of other 3rd party classes.\n\/\/wrapper class of our all third party packages.\nclass Waiter\n{\n    public $kitchen;\n    public $cashier;\n\n    public function __construct()\n    {\n        $this->kitchen = new Kitchen();\n        $this->cashier = new Cashier();\n    }\n\n    \/\/providing a simple method called order for client\n    public function order()\n    {\n        $this->kitchen->cook();\n        $this->cashier->bill();\n    }\n}\n\n\n$waiter = new Waiter();\n$waiter->order();\n\n<\/code><\/pre>\n\n\n\n
<\/a>C# Sample Code<\/h3>\n\n\n\n
using System;\n\nnamespace HelloWorld\n{\n\n    \/\/Waiter facade hiding the complexity of other 3rd party classes.\n    \/\/wrapper class of our all third party packages.\n    public class Facade\n    {\n        protected Kitchen _kitchen;\n\n        protected Cashier _cashier;\n\n        public Facade()\n        {\n            this._kitchen = new Kitchen();\n            this._cashier = new Cashier();\n        }\n\n        \/\/providing a simple method called order for client\n        public string order()\n        {\n            string result = \"\";\n            result += this._kitchen.cook();\n            result += this._cashier.bill();\n            return result;\n        }\n    }\n\n    \/\/ 3rd party module classes\n    public class Kitchen\n    {\n        public string cook()\n        {\n            return \"cook order\";\n        }\n    }\n\n    public class Cashier\n    {\n        public string bill()\n        {\n            return \"print bill\";\n        }\n\n    }\n\n    class Program\n    {\n        static void Main(string[] args)\n        {\n            Facade facade = new Facade();\n            Console.Write(facade.order());\n        }\n    }\n\n}\n<\/code><\/pre>\n\n\n\n
By Yuuma.<\/p>\n
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