Senaryo<\/th>\n<\/tr>\n<\/thead>\n
\nBu senaryoda basit bir Console Application \u00fczerinden Front Controller Design Pattern’\u0131n nas\u0131l uyguland\u0131\u011f\u0131n\u0131 ele al\u0131yor olaca\u011f\u0131z.<\/p>\n Senaryo mahiyet a\u00e7\u0131s\u0131ndan \u015f\u00f6yle olacakt\u0131r; bir banka uygulamas\u0131 geli\u015ftirdi\u011fimizi d\u00fc\u015f\u00fcnelim. Bu uygulamada client’lar taraf\u0131ndan yap\u0131lan t\u00fcm istekler merkezi bir s\u0131n\u0131f olan `BankaController(Front Controller)<\/span><\/code> taraf\u0131ndan kar\u015f\u0131lanacak ve yap\u0131lan iste\u011fi ya GarantiHandler(Handler)<\/span><\/code> ya da HalkbankHandler(Handler)<\/span><\/code> nesnelerinden ilgili olan\u0131na y\u00f6nlendirecek.\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n` \n\u00c7\u00f6z\u00fcm<\/strong><\/p>\n\nAd\u0131m 1<\/em> \nHer\u015feyden \u00f6nce GarantiHandler(Handler)<\/span><\/code> ve HalkbankHandler(Handler)<\/span><\/code> s\u0131n\u0131flar\u0131n\u0131 olu\u015fturarak ba\u015flayal\u0131m.<\/p>\n\r\n public class GarantiHandler\r\n {\r\n public void FaturaOde(decimal tutar)\r\n => Console.WriteLine($"{tutar} TL tutar\u0131nda fatura \u00f6denmi\u015ftir.");\r\n public void EFT(decimal tutar, string hesapNo)\r\n => Console.WriteLine($"{tutar} TL tutar\u0131nda para {hesapNo} numaral\u0131 hesaba g\u00f6nderilmi\u015ftir.");\r\n }\r\n<\/pre>\n\r\n public class HalkbankHandler\r\n {\r\n public void KrediCek(int tutar)\r\n => Console.WriteLine($"{tutar} TL tutar\u0131nda kredi \u00e7ekilmi\u015ftir.");\r\n }\r\n<\/pre>\nHandler s\u0131n\u0131flar\u0131 birbirlerinden farkl\u0131 olabilirler. Dolay\u0131s\u0131yla yukar\u0131daki tan\u0131mlanan s\u0131n\u0131flardaki memberlar\u0131n birbirlerinden farkl\u0131 oldu\u011funa dikkatinizi \u00e7ekerim.\n<\/li>\n Ad\u0131m 2<\/em> \nHandler s\u0131n\u0131flar\u0131 olu\u015fturulduktan sonra iste\u011fe g\u00f6re hangi handler’\u0131n tetiklenece\u011finin karar\u0131n\u0131 verecek ve y\u00f6nlendirme i\u015flemini \u00fcstlenecek olan BankaDispatcher(Dispatcher)<\/span><\/code> nesnesini olu\u015fturmam\u0131z gerekmektedir.<\/p>\n\r\n public class BankaDispatcher\r\n {\r\n readonly GarantiHandler _garantiHandler;\r\n readonly HalkbankHandler _halkbankHandler;\r\n\r\n public BankaDispatcher()\r\n {\r\n _garantiHandler = new();\r\n _halkbankHandler = new();\r\n }\r\n\r\n public void Dispatch(Banka banka, Islem islem, object[] values)\r\n {\r\n var process = (banka, islem) switch\r\n {\r\n (Banka.Garanti, Islem.FaturaOde) => 1,\r\n (Banka.Garanti, Islem.EFT) => 2,\r\n (Banka.Halkbank, Islem.KrediCek) => 3,\r\n };\r\n\r\n if (process == 1)\r\n _garantiHandler.FaturaOde((decimal)values[0]);\r\n else if (process == 2)\r\n _garantiHandler.EFT((decimal)values[0], (string)values[1]);\r\n else if (process == 3)\r\n _halkbankHandler.KrediCek((int)values[0]);\r\n }\r\n }\r\n<\/pre>\nYukar\u0131daki BankaDispatcher(Dispatcher)<\/span><\/code> s\u0131n\u0131f\u0131n\u0131 incelerseniz e\u011fer i\u00e7erisinde GarantiHandler(Handler)<\/span><\/code> ve HalkbankHandler(Handler)<\/span><\/code> s\u0131n\u0131flar\u0131n\u0131n referanslar\u0131n\u0131 bar\u0131nd\u0131rmakta ve constructor i\u00e7erisinde bu referanslara birer instance \u00fcretip, ba\u011flamaktad\u0131r. ‘Dispatch’ metoduna g\u00f6z atarsan\u0131z e\u011fer BankaController(Front Controller)<\/span><\/code> taraf\u0131ndan kar\u015f\u0131lanacak isteklerdeki parametrelere g\u00f6re yap\u0131lacak i\u015flemi analiz etmekte ve gerekli handler’\u0131 tetiklemektedir.<\/p>\n Burada kullan\u0131lan ‘Banka’ ve ‘Islem’ enum’lar\u0131n\u0131n i\u00e7eri\u011fide a\u015fa\u011f\u0131daki gibi olacakt\u0131r.<\/p>\n \r\n public enum Banka\r\n {\r\n [Display(Name = "Garanti Bankas\u0131")]\r\n Garanti,\r\n [Display(Name = "Halk Bankas\u0131")]\r\n Halkbank\r\n }\r\n<\/pre>\n\r\n public enum Islem\r\n {\r\n [Display(Name = "Fatura \u00d6deme")]\r\n FaturaOde,\r\n [Display(Name = "EFT")]\r\n EFT,\r\n [Display(Name = "Kredi \u00c7ekme")]\r\n KrediCek\r\n }\r\n<\/pre>\n<\/li>\nAd\u0131m 3<\/em> \nArd\u0131ndan client taraf\u0131ndan gelecek olan istekleri kar\u015f\u0131layacak olan BankaController(Front Controller)<\/span><\/code> s\u0131n\u0131f\u0131n\u0131 olu\u015ftural\u0131m.<\/p>\n\r\n public class BankaController\r\n {\r\n readonly BankaDispatcher _dispatcher;\r\n public BankaController()\r\n => _dispatcher = new();\r\n\r\n bool IsAuthenticUser()\r\n {\r\n Console.WriteLine("Kullan\u0131c\u0131 ba\u015far\u0131yla do\u011frulanm\u0131\u015ft\u0131r.");\r\n return true;\r\n }\r\n void SetLog(Banka banka, Islem islem)\r\n => Console.WriteLine($"{GetDisplayName(banka.GetType(), banka.ToString())} bankas\u0131nda {GetDisplayName(islem.GetType(), islem.ToString())} yap\u0131lm\u0131\u015ft\u0131r.");\r\n\r\n string GetDisplayName(Type type, string member)\r\n => type\r\n .GetMember(member)\r\n .First()\r\n .GetCustomAttribute<DisplayAttribute>()\r\n .Name;\r\n\r\n public void DispatchBanka(Banka banka, Islem islem, object[] values)\r\n {\r\n if (IsAuthenticUser())\r\n {\r\n _dispatcher.Dispatch(banka, islem, values);\r\n SetLog(banka, islem);\r\n }\r\n }\r\n }\r\n<\/pre>\nYukar\u0131da BankaController(Front Controller)<\/span><\/code> s\u0131n\u0131f\u0131n\u0131n kodunu incelerseniz e\u011fer i\u00e7erisinde t\u00fcm isteklerdeki \u00f6ncelikli ve tekrar i\u015flemler olan kullan\u0131c\u0131 kimlik do\u011frulama, loglama vs. gibi ‘IsAuthenticUser’, ‘SetLog’ operasyonlar\u0131n\u0131 bar\u0131nd\u0131rmaktad\u0131r. Bu operasyonlar e\u015fli\u011finde referans etti\u011fi BankaDispatcher(Dispatcher)<\/span><\/code> nesnesi \u00fczerinden gerekli handler s\u0131n\u0131flar\u0131n\u0131 tetiklemektedir.\n<\/li>\n Ad\u0131m 4<\/em> \nArt\u0131k s\u0131ra in\u015fa edilen bu yap\u0131y\u0131 kullanmaya gelmi\u015ftir.<\/p>\n\r\n class Program\r\n {\r\n static void Main(string[] args)\r\n {\r\n BankaController bankaController = new();\r\n bankaController.DispatchBanka(Banka.Garanti, Islem.EFT, new object[] { (decimal)1000, "8123123" });\r\n Console.WriteLine("***");\r\n bankaController.DispatchBanka(Banka.Garanti, Islem.FaturaOde, new object[] { (decimal)250 });\r\n Console.WriteLine("***");\r\n bankaController.DispatchBanka(Banka.Halkbank, Islem.KrediCek, new object[] { 25000 });\r\n }\r\n }\r\n<\/pre>\nYukar\u0131daki kod blo\u011funu incelerseniz e\u011fer Front Controller tasar\u0131m\u0131n\u0131 uygulad\u0131\u011f\u0131m\u0131z BankaController(Front Controller)<\/span><\/code> s\u0131n\u0131f\u0131ndan bir nesne olu\u015fturulmakta ve farkl\u0131 parametreler e\u015fli\u011finde \u00fc\u00e7 istek ger\u00e7ekle\u015ftirilmektedir. BankaDispatcher(Dispatcher)<\/span><\/code> nesnesinde bu istekteki parametrelerin mahiyetine uygun bir \u015fekilde hangi handler’\u0131n tetiklenece\u011fi analiz edilmekte ve sonu\u00e7 a\u015fa\u011f\u0131daki gibi olmaktad\u0131r. \n<\/a> \nG\u00f6r\u00fcld\u00fc\u011f\u00fc \u00fczere, iste\u011fin ilgilendi\u011fi handler farketmeksizin her bir istekte yap\u0131lmas\u0131 gereken t\u00fcm sabit i\u015flemleri tekrar tekrar yapmaktansa Front Controller deseni sayesinde tek bir merkezi s\u0131n\u0131fta yap\u0131p, beklenen i\u015fleri daha az maliyetle ger\u00e7ekle\u015ftirmi\u015f bulunmaktay\u0131z.\n<\/li>\n<\/ul>\n<\/div>\n Ne Zaman Kullan\u0131l\u0131r?<\/h5>\nUygulamadaki request’ler i\u015flenirken ortak i\u015flemlerin say\u0131s\u0131 haddinden fazlaysa ve anlams\u0131z boyutta kod tekrar\u0131 yapmay\u0131 elzem k\u0131l\u0131yorsa kullan\u0131lmas\u0131 tavsiye edilmektedir.<\/p>\n Faydalar\u0131<\/h3>\n\nFront Controller, uygulamaya y\u00f6nelik t\u00fcm istekleri i\u015fler. B\u00f6ylece, kullan\u0131c\u0131 izleme ve g\u00fcvenlik gibi genel politikalar\u0131n uygulanmas\u0131 i\u00e7in merkezi kontrol<\/u><\/strong><\/em> sa\u011flar.<\/li>\n Yeni bir istek geldi\u011finde Front Controller kar\u015f\u0131layaca\u011f\u0131ndan dolay\u0131 thread safety<\/u><\/strong><\/em> sa\u011flamaktad\u0131r.<\/li>\n Uygulaman\u0131n konfig\u00fcrasyonu<\/u><\/strong><\/em> b\u00fcy\u00fck \u00f6l\u00e7\u00fcde basitle\u015ftirilmi\u015ftir.<\/u><\/strong><\/em><\/li>\n<\/ul>\nFront Controller Design Pattern, handler s\u0131n\u0131flar\u0131nda ayn\u0131 kodu tekrar tekrar yazmaks\u0131z\u0131n yeniden kullanma esnekli\u011fi ve yetene\u011fi sa\u011flar. \u00c7\u00fcnk\u00fc yetki, log vs. gibi i\u015flemler Front Controller taraf\u0131ndan ger\u00e7ekle\u015ftirilir.<\/em><\/p><\/blockquote>\n MVC Modeliyle \u0130li\u015fkileri<\/h5>\nAsp.NET(Core) MVC mimarisi tam anlam\u0131yla Front Controller tasar\u0131m\u0131na uygun bir altyap\u0131yla geli\u015ftirilmi\u015ftir. \u0130lgili mimarideki Routing yap\u0131lanmas\u0131 esas\u0131nda buradaki Dispatcher nesnesiyle e\u015fde\u011fer g\u00f6r\u00fclebilir ve her ikisi de gelen iste\u011fi uygun handler(controller)lara da\u011f\u0131tma g\u00f6revi g\u00f6rmektedir.<\/p>\n Ayr\u0131ca Front Controller, MVC’de ki controller’a alternatiftir diyebiliriz. Misal; Front Controller, t\u00fcm istekleri bir controller’da i\u015fler. MVC’de ise her iste\u011fi uygun controller kar\u015f\u0131lar ve i\u015fler. Haliyle Front Controller MVC’ye nazaran daha karma\u015f\u0131kt\u0131r.<\/p>\n Bu durumu daha net \u015f\u00f6yle yorumlayabiliriz. MVC genel bir kal\u0131pt\u0131r. Yani MVC’de fikir, bir uygulaman\u0131n i\u015fleyi\u015fini Model<\/em> – View<\/em> – Controller<\/em> olarak ay\u0131rmakt\u0131r. Bu fikir bir uygulaman\u0131n \u00f6zelliklerine g\u00f6re iki farkl\u0131 \u015fekilde ger\u00e7ekle\u015ftirilebilir. Birincisi, her bir iste\u011fe yan\u0131t veren ayr\u0131 controller s\u0131n\u0131f\u0131 olu\u015fturmakt\u0131r. Yani klasik MVC pattern’\u0131 uygulamakt\u0131r. \u0130kicisi ise t\u00fcm istekleri kar\u015f\u0131layan ve ard\u0131ndan bunlar\u0131 farkl\u0131 handler’lara y\u00f6nlendiren tek bir ana controller’a sahip olmak. Yani Front Controller tasar\u0131m\u0131n\u0131 uygulamak. Haliyle Front Controller tasar\u0131m\u0131 MVC kal\u0131b\u0131n\u0131n bir alt takti\u011fi olarak kar\u015f\u0131m\u0131za \u00e7\u0131kmaktad\u0131r.<\/p>\n Nihai olarak; \nB\u00f6ylece yerine g\u00f6re merkezi yap\u0131lanman\u0131n gerekti\u011fi durumlarda kullan\u0131labilecek bir tasar\u0131m olan Front Controller’\u0131 incelemi\u015f ve tasar\u0131msal kavramlar\u0131 e\u015fli\u011finde me\u015fhur MVC pattern ile olabilecek ili\u015fkilerini de\u011ferlendirmi\u015f bulunmaktay\u0131z.<\/p>\n \u0130lgilenenlerin faydalanmas\u0131 dile\u011fiyle… \nSonraki yaz\u0131lar\u0131mda g\u00f6r\u00fc\u015fmek \u00fczere… \n\u0130yi \u00e7al\u0131\u015fmalar…<\/p>\n","protected":false},"excerpt":{"rendered":" Merhaba, Bu i\u00e7eri\u011fimizde yap\u0131sal desenler(structural patterns) kategorisiyle birlikte bir yandan da web aray\u00fcz desenleri kategorisinde de ad\u0131ndan bahsettiren Front Controller Design Pattern \u00fczerine konu\u015fuyor olaca\u011f\u0131z. \u0130\u00e7eri\u011fimiz s\u00fcresince Front Controller Design Pattern nedir? ne ama\u00e7la...<\/p>\n","protected":false},"author":1,"featured_media":23163,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2739,153],"tags":[750,4408,4409,4407],"class_list":["post-23158","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-net-core","category-design-pattern","tag-design-pattern","tag-front-controller","tag-front-controller-d-p","tag-front-controller-design-pattern"],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/posts\/23158","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/comments?post=23158"}],"version-history":[{"count":47,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/posts\/23158\/revisions"}],"predecessor-version":[{"id":23207,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/posts\/23158\/revisions\/23207"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/media\/23163"}],"wp:attachment":[{"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/media?parent=23158"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/categories?post=23158"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/tags?post=23158"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}

Senaryo mahiyet a\u00e7\u0131s\u0131ndan \u015f\u00f6yle olacakt\u0131r; bir banka uygulamas\u0131 geli\u015ftirdi\u011fimizi d\u00fc\u015f\u00fcnelim. Bu uygulamada client’lar taraf\u0131ndan yap\u0131lan t\u00fcm istekler merkezi bir s\u0131n\u0131f olan

BankaController(Front Controller)<\/span><\/code> taraf\u0131ndan kar\u015f\u0131lanacak ve yap\u0131lan iste\u011fi ya GarantiHandler(Handler)<\/span><\/code> ya da HalkbankHandler(Handler)<\/span><\/code> nesnelerinden ilgili olan\u0131na y\u00f6nlendirecek.\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\n\u00c7\u00f6z\u00fcm<\/strong><\/p>\n\nAd\u0131m 1<\/em>
\nHer\u015feyden \u00f6nce GarantiHandler(Handler)<\/span><\/code> ve HalkbankHandler(Handler)<\/span><\/code> s\u0131n\u0131flar\u0131n\u0131 olu\u015fturarak ba\u015flayal\u0131m.<\/p>\n\r\n    public class GarantiHandler\r\n    {\r\n        public void FaturaOde(decimal tutar)\r\n            => Console.WriteLine($"{tutar} TL tutar\u0131nda fatura \u00f6denmi\u015ftir.");\r\n        public void EFT(decimal tutar, string hesapNo)\r\n            => Console.WriteLine($"{tutar} TL tutar\u0131nda para {hesapNo} numaral\u0131 hesaba g\u00f6nderilmi\u015ftir.");\r\n    }\r\n<\/pre>\n\r\n    public class HalkbankHandler\r\n    {\r\n        public void KrediCek(int tutar)\r\n            => Console.WriteLine($"{tutar} TL tutar\u0131nda kredi \u00e7ekilmi\u015ftir.");\r\n    }\r\n<\/pre>\nHandler s\u0131n\u0131flar\u0131 birbirlerinden farkl\u0131 olabilirler. Dolay\u0131s\u0131yla yukar\u0131daki tan\u0131mlanan s\u0131n\u0131flardaki memberlar\u0131n birbirlerinden farkl\u0131 oldu\u011funa dikkatinizi \u00e7ekerim.\n<\/li>\n
Ad\u0131m 2<\/em>
\nHandler s\u0131n\u0131flar\u0131 olu\u015fturulduktan sonra iste\u011fe g\u00f6re hangi handler’\u0131n tetiklenece\u011finin karar\u0131n\u0131 verecek ve y\u00f6nlendirme i\u015flemini \u00fcstlenecek olan BankaDispatcher(Dispatcher)<\/span><\/code> nesnesini olu\u015fturmam\u0131z gerekmektedir.<\/p>\n\r\n    public class BankaDispatcher\r\n    {\r\n        readonly GarantiHandler _garantiHandler;\r\n        readonly HalkbankHandler _halkbankHandler;\r\n\r\n        public BankaDispatcher()\r\n        {\r\n            _garantiHandler = new();\r\n            _halkbankHandler = new();\r\n        }\r\n\r\n        public void Dispatch(Banka banka, Islem islem, object[] values)\r\n        {\r\n            var process = (banka, islem) switch\r\n            {\r\n                (Banka.Garanti, Islem.FaturaOde) => 1,\r\n                (Banka.Garanti, Islem.EFT) => 2,\r\n                (Banka.Halkbank, Islem.KrediCek) => 3,\r\n            };\r\n\r\n            if (process == 1)\r\n                _garantiHandler.FaturaOde((decimal)values[0]);\r\n            else if (process == 2)\r\n                _garantiHandler.EFT((decimal)values[0], (string)values[1]);\r\n            else if (process == 3)\r\n                _halkbankHandler.KrediCek((int)values[0]);\r\n        }\r\n    }\r\n<\/pre>\nYukar\u0131daki BankaDispatcher(Dispatcher)<\/span><\/code> s\u0131n\u0131f\u0131n\u0131 incelerseniz e\u011fer i\u00e7erisinde GarantiHandler(Handler)<\/span><\/code> ve HalkbankHandler(Handler)<\/span><\/code> s\u0131n\u0131flar\u0131n\u0131n referanslar\u0131n\u0131 bar\u0131nd\u0131rmakta ve constructor i\u00e7erisinde bu referanslara birer instance \u00fcretip, ba\u011flamaktad\u0131r. ‘Dispatch’ metoduna g\u00f6z atarsan\u0131z e\u011fer BankaController(Front Controller)<\/span><\/code> taraf\u0131ndan kar\u015f\u0131lanacak isteklerdeki parametrelere g\u00f6re yap\u0131lacak i\u015flemi analiz etmekte ve gerekli handler’\u0131 tetiklemektedir.<\/p>\n
Burada kullan\u0131lan ‘Banka’ ve ‘Islem’ enum’lar\u0131n\u0131n i\u00e7eri\u011fide a\u015fa\u011f\u0131daki gibi olacakt\u0131r.<\/p>\n
\r\n    public enum Banka\r\n    {\r\n        [Display(Name = "Garanti Bankas\u0131")]\r\n        Garanti,\r\n        [Display(Name = "Halk Bankas\u0131")]\r\n        Halkbank\r\n    }\r\n<\/pre>\n\r\n    public enum Islem\r\n    {\r\n        [Display(Name = "Fatura \u00d6deme")]\r\n        FaturaOde,\r\n        [Display(Name = "EFT")]\r\n        EFT,\r\n        [Display(Name = "Kredi \u00c7ekme")]\r\n        KrediCek\r\n    }\r\n<\/pre>\n<\/li>\nAd\u0131m 3<\/em>
\nArd\u0131ndan client taraf\u0131ndan gelecek olan istekleri kar\u015f\u0131layacak olan BankaController(Front Controller)<\/span><\/code> s\u0131n\u0131f\u0131n\u0131 olu\u015ftural\u0131m.<\/p>\n\r\n    public class BankaController\r\n    {\r\n        readonly BankaDispatcher _dispatcher;\r\n        public BankaController()\r\n            => _dispatcher = new();\r\n\r\n        bool IsAuthenticUser()\r\n        {\r\n            Console.WriteLine("Kullan\u0131c\u0131 ba\u015far\u0131yla do\u011frulanm\u0131\u015ft\u0131r.");\r\n            return true;\r\n        }\r\n        void SetLog(Banka banka, Islem islem)\r\n            => Console.WriteLine($"{GetDisplayName(banka.GetType(), banka.ToString())} bankas\u0131nda {GetDisplayName(islem.GetType(), islem.ToString())} yap\u0131lm\u0131\u015ft\u0131r.");\r\n\r\n        string GetDisplayName(Type type, string member)\r\n            => type\r\n            .GetMember(member)\r\n            .First()\r\n            .GetCustomAttribute<DisplayAttribute>()\r\n            .Name;\r\n\r\n        public void DispatchBanka(Banka banka, Islem islem, object[] values)\r\n        {\r\n            if (IsAuthenticUser())\r\n            {\r\n                _dispatcher.Dispatch(banka, islem, values);\r\n                SetLog(banka, islem);\r\n            }\r\n        }\r\n    }\r\n<\/pre>\nYukar\u0131da BankaController(Front Controller)<\/span><\/code> s\u0131n\u0131f\u0131n\u0131n kodunu incelerseniz e\u011fer i\u00e7erisinde t\u00fcm isteklerdeki \u00f6ncelikli ve tekrar i\u015flemler olan kullan\u0131c\u0131 kimlik do\u011frulama, loglama vs. gibi ‘IsAuthenticUser’, ‘SetLog’ operasyonlar\u0131n\u0131 bar\u0131nd\u0131rmaktad\u0131r. Bu operasyonlar e\u015fli\u011finde referans etti\u011fi BankaDispatcher(Dispatcher)<\/span><\/code> nesnesi \u00fczerinden gerekli handler s\u0131n\u0131flar\u0131n\u0131 tetiklemektedir.\n<\/li>\n
Ad\u0131m 4<\/em>
\nArt\u0131k s\u0131ra in\u015fa edilen bu yap\u0131y\u0131 kullanmaya gelmi\u015ftir.<\/p>\n\r\n    class Program\r\n    {\r\n        static void Main(string[] args)\r\n        {\r\n            BankaController bankaController = new();\r\n            bankaController.DispatchBanka(Banka.Garanti, Islem.EFT, new object[] { (decimal)1000, "8123123" });\r\n            Console.WriteLine("*****");\r\n            bankaController.DispatchBanka(Banka.Garanti, Islem.FaturaOde, new object[] { (decimal)250 });\r\n            Console.WriteLine("*****");\r\n            bankaController.DispatchBanka(Banka.Halkbank, Islem.KrediCek, new object[] { 25000 });\r\n        }\r\n    }\r\n<\/pre>\nYukar\u0131daki kod blo\u011funu incelerseniz e\u011fer Front Controller tasar\u0131m\u0131n\u0131 uygulad\u0131\u011f\u0131m\u0131z BankaController(Front Controller)<\/span><\/code> s\u0131n\u0131f\u0131ndan bir nesne olu\u015fturulmakta ve farkl\u0131 parametreler e\u015fli\u011finde \u00fc\u00e7 istek ger\u00e7ekle\u015ftirilmektedir. BankaDispatcher(Dispatcher)<\/span><\/code> nesnesinde bu istekteki parametrelerin mahiyetine uygun bir \u015fekilde hangi handler’\u0131n tetiklenece\u011fi analiz edilmekte ve sonu\u00e7 a\u015fa\u011f\u0131daki gibi olmaktad\u0131r.
\n<\/a>
\nG\u00f6r\u00fcld\u00fc\u011f\u00fc \u00fczere, iste\u011fin ilgilendi\u011fi handler farketmeksizin her bir istekte yap\u0131lmas\u0131 gereken t\u00fcm sabit i\u015flemleri tekrar tekrar yapmaktansa Front Controller deseni sayesinde tek bir merkezi s\u0131n\u0131fta yap\u0131p, beklenen i\u015fleri daha az maliyetle ger\u00e7ekle\u015ftirmi\u015f bulunmaktay\u0131z.\n<\/li>\n<\/ul>\n<\/div>\n
Ne Zaman Kullan\u0131l\u0131r?<\/h5>\nUygulamadaki request’ler i\u015flenirken ortak i\u015flemlerin say\u0131s\u0131 haddinden fazlaysa ve anlams\u0131z boyutta kod tekrar\u0131 yapmay\u0131 elzem k\u0131l\u0131yorsa kullan\u0131lmas\u0131 tavsiye edilmektedir.<\/p>\n
Faydalar\u0131<\/h3>\n\nFront Controller, uygulamaya y\u00f6nelik t\u00fcm istekleri i\u015fler. B\u00f6ylece, kullan\u0131c\u0131 izleme ve g\u00fcvenlik gibi genel politikalar\u0131n uygulanmas\u0131 i\u00e7in merkezi kontrol<\/u><\/strong><\/em> sa\u011flar.<\/li>\n
Yeni bir istek geldi\u011finde Front Controller kar\u015f\u0131layaca\u011f\u0131ndan dolay\u0131 thread safety<\/u><\/strong><\/em> sa\u011flamaktad\u0131r.<\/li>\n
Uygulaman\u0131n konfig\u00fcrasyonu<\/u><\/strong><\/em> b\u00fcy\u00fck \u00f6l\u00e7\u00fcde basitle\u015ftirilmi\u015ftir.<\/u><\/strong><\/em><\/li>\n<\/ul>\nFront Controller Design Pattern, handler s\u0131n\u0131flar\u0131nda ayn\u0131 kodu tekrar tekrar yazmaks\u0131z\u0131n yeniden kullanma esnekli\u011fi ve yetene\u011fi sa\u011flar. \u00c7\u00fcnk\u00fc yetki, log vs. gibi i\u015flemler Front Controller taraf\u0131ndan ger\u00e7ekle\u015ftirilir.<\/em><\/p><\/blockquote>\n
MVC Modeliyle \u0130li\u015fkileri<\/h5>\nAsp.NET(Core) MVC mimarisi tam anlam\u0131yla Front Controller tasar\u0131m\u0131na uygun bir altyap\u0131yla geli\u015ftirilmi\u015ftir. \u0130lgili mimarideki Routing yap\u0131lanmas\u0131 esas\u0131nda buradaki Dispatcher nesnesiyle e\u015fde\u011fer g\u00f6r\u00fclebilir ve her ikisi de gelen iste\u011fi uygun handler(controller)lara da\u011f\u0131tma g\u00f6revi g\u00f6rmektedir.<\/p>\n
Ayr\u0131ca Front Controller, MVC’de ki controller’a alternatiftir diyebiliriz. Misal; Front Controller, t\u00fcm istekleri bir controller’da i\u015fler. MVC’de ise her iste\u011fi uygun controller kar\u015f\u0131lar ve i\u015fler. Haliyle Front Controller MVC’ye nazaran daha karma\u015f\u0131kt\u0131r.<\/p>\n
Bu durumu daha net \u015f\u00f6yle yorumlayabiliriz. MVC genel bir kal\u0131pt\u0131r. Yani MVC’de fikir, bir uygulaman\u0131n i\u015fleyi\u015fini Model<\/em> – View<\/em> – Controller<\/em> olarak ay\u0131rmakt\u0131r. Bu fikir bir uygulaman\u0131n \u00f6zelliklerine g\u00f6re iki farkl\u0131 \u015fekilde ger\u00e7ekle\u015ftirilebilir. Birincisi, her bir iste\u011fe yan\u0131t veren ayr\u0131 controller s\u0131n\u0131f\u0131 olu\u015fturmakt\u0131r. Yani klasik MVC pattern’\u0131 uygulamakt\u0131r. \u0130kicisi ise t\u00fcm istekleri kar\u015f\u0131layan ve ard\u0131ndan bunlar\u0131 farkl\u0131 handler’lara y\u00f6nlendiren tek bir ana controller’a sahip olmak. Yani Front Controller tasar\u0131m\u0131n\u0131 uygulamak. Haliyle Front Controller tasar\u0131m\u0131 MVC kal\u0131b\u0131n\u0131n bir alt takti\u011fi olarak kar\u015f\u0131m\u0131za \u00e7\u0131kmaktad\u0131r.<\/p>\n
Nihai olarak;
\nB\u00f6ylece yerine g\u00f6re merkezi yap\u0131lanman\u0131n gerekti\u011fi durumlarda kullan\u0131labilecek bir tasar\u0131m olan Front Controller’\u0131 incelemi\u015f ve tasar\u0131msal kavramlar\u0131 e\u015fli\u011finde me\u015fhur MVC pattern ile olabilecek ili\u015fkilerini de\u011ferlendirmi\u015f bulunmaktay\u0131z.<\/p>\n
\u0130lgilenenlerin faydalanmas\u0131 dile\u011fiyle…
\nSonraki yaz\u0131lar\u0131mda g\u00f6r\u00fc\u015fmek \u00fczere…
\n\u0130yi \u00e7al\u0131\u015fmalar…<\/p>\n","protected":false},"excerpt":{"rendered":"
Merhaba, Bu i\u00e7eri\u011fimizde yap\u0131sal desenler(structural patterns) kategorisiyle birlikte bir yandan da web aray\u00fcz desenleri kategorisinde de ad\u0131ndan bahsettiren Front Controller Design Pattern \u00fczerine konu\u015fuyor olaca\u011f\u0131z. \u0130\u00e7eri\u011fimiz s\u00fcresince Front Controller Design Pattern nedir? ne ama\u00e7la...<\/p>\n","protected":false},"author":1,"featured_media":23163,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2739,153],"tags":[750,4408,4409,4407],"class_list":["post-23158","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-net-core","category-design-pattern","tag-design-pattern","tag-front-controller","tag-front-controller-d-p","tag-front-controller-design-pattern"],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/posts\/23158","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/comments?post=23158"}],"version-history":[{"count":47,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/posts\/23158\/revisions"}],"predecessor-version":[{"id":23207,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/posts\/23158\/revisions\/23207"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/media\/23163"}],"wp:attachment":[{"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/media?parent=23158"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/categories?post=23158"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/tags?post=23158"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}