Yaz\u0131l\u0131m geli\u015ftirme s\u00fcre\u00e7leri, g\u00fcn\u00fcm\u00fcz\u00fcn karma\u015f\u0131k ve s\u00fcrekli de\u011fi\u015fen i\u015f ihtiya\u00e7lar\u0131na cevap verebilmek i\u00e7in esneklik, geni\u015fletilebilirlik ve s\u00fcrd\u00fcr\u00fclebilirlik gibi temel prensiplere odaklanmaktad\u0131r. Bu prensiplere ula\u015fmada tasar\u0131m desenleri (design patterns) kritik bir rol oynar. Tasar\u0131m desenleri, yaz\u0131l\u0131m geli\u015ftirmede kar\u015f\u0131la\u015f\u0131lan yayg\u0131n sorunlara kan\u0131tlanm\u0131\u015f, yeniden kullan\u0131labilir \u00e7\u00f6z\u00fcmler sunar. Bu desenler aras\u0131nda nesne olu\u015fturma (creational) desenleri, uygulamalar\u0131n temel yap\u0131 ta\u015flar\u0131 olan nesnelerin nas\u0131l olu\u015fturulaca\u011f\u0131 ve y\u00f6netilece\u011fi konusunda rehberlik eder. Bu makalede, nesne olu\u015fturma desenlerinin en pop\u00fcler ve yayg\u0131n kullan\u0131lanlar\u0131ndan biri olan Factory (Fabrika) tasar\u0131m desenini Java ba\u011flam\u0131nda detayl\u0131ca inceleyece\u011fiz. Factory deseni, nesne olu\u015fturma mant\u0131\u011f\u0131n\u0131 istemci koddan soyutlayarak daha temiz, daha esnek ve daha \u00f6l\u00e7eklenebilir uygulamalar geli\u015ftirilmesine olanak tan\u0131r.<\/p>\n
Tasar\u0131m desenleri, yaz\u0131l\u0131m mimarlar\u0131 Erich Gamma, Richard Helm, Ralph Johnson ve John Vlissides taraf\u0131ndan 1994 y\u0131l\u0131nda yay\u0131nlanan “Design Patterns: Elements of Reusable Object-Oriented Software” adl\u0131 kitapla pop\u00fcler hale gelmi\u015ftir. Bu yazarlara “Gang of Four” (GoF) ad\u0131 verilmi\u015ftir. GoF, desenleri \u00fc\u00e7 ana kategoriye ay\u0131rm\u0131\u015ft\u0131r:<\/p>\n
* Creational (Olu\u015fturucu) Desenler:<\/strong> Nesnelerin nas\u0131l olu\u015fturuldu\u011funu soyutlar ve bu s\u00fcreci kontrol eder. Factory, Singleton, Builder, Prototype, Abstract Factory bu kategoriye girer. Tasar\u0131m desenleri kullanmak, yaz\u0131l\u0131m projelerine bir\u00e7ok fayda sa\u011flar:<\/p>\n * Kan\u0131tlanm\u0131\u015f \u00c7\u00f6z\u00fcmler:<\/strong> Yayg\u0131n sorunlara end\u00fcstri standard\u0131 \u00e7\u00f6z\u00fcmler sunar. Factory tasar\u0131m deseni, Creational desenler kategorisine ait olup, nesne olu\u015fturma sorumlulu\u011funu istemci koddan ay\u0131rmay\u0131 hedefler. Temel prensibi, bir nesne olu\u015fturma aray\u00fcz\u00fc tan\u0131mlamak, ancak hangi somut s\u0131n\u0131f\u0131n \u00f6rneklenece\u011fine alt s\u0131n\u0131flar\u0131n karar vermesini sa\u011flamakt\u0131r. Bu, istemcinin belirli bir s\u0131n\u0131f\u0131 do\u011frudan Bu soyutlama, \u00f6zellikle a\u015fa\u011f\u0131daki durumlarda b\u00fcy\u00fck faydalar sa\u011flar:<\/p>\n * Uygulaman\u0131n, farkl\u0131 somut s\u0131n\u0131flardan nesneler olu\u015fturmas\u0131 gerekti\u011finde ve bu somut s\u0131n\u0131flar gelecekte de\u011fi\u015febilece\u011finde veya yenileri eklenebilece\u011finde. Factory deseni, “Open\/Closed Prensibi”ne (bir yaz\u0131l\u0131m varl\u0131\u011f\u0131 geni\u015fletmeye a\u00e7\u0131k olmal\u0131 ancak de\u011fi\u015ftirmeye kapal\u0131 olmal\u0131) uyum sa\u011flamaya yard\u0131mc\u0131 olur. Yeni bir \u00fcr\u00fcn tipi eklendi\u011finde, mevcut istemci kodunu de\u011fi\u015ftirmeye gerek kalmadan sadece yeni bir somut \u00fcr\u00fcn s\u0131n\u0131f\u0131 ve\/veya fabrika s\u0131n\u0131f\u0131 eklenmesi yeterli olabilir.<\/p>\n Factory deseninin farkl\u0131 t\u00fcrleri olsa da, temel olarak a\u015fa\u011f\u0131daki bile\u015fenleri i\u00e7erir:<\/p>\n * \u00dcr\u00fcn (Product) Aray\u00fcz\u00fc\/Soyut S\u0131n\u0131f\u0131:<\/strong> Fabrika taraf\u0131ndan olu\u015fturulacak t\u00fcm nesnelerin uygulayaca\u011f\u0131 ortak aray\u00fcz\u00fc veya miras alaca\u011f\u0131 soyut s\u0131n\u0131f\u0131 tan\u0131mlar. Bu, istemci kodun somut \u00fcr\u00fcn s\u0131n\u0131flar\u0131n\u0131 bilmeden \u00fcr\u00fcnlerle \u00e7al\u0131\u015fmas\u0131n\u0131 sa\u011flar. Factory deseni genellikle \u00fc\u00e7 ana varyasyonda kar\u015f\u0131m\u0131za \u00e7\u0131kar: Simple Factory, Factory Method ve Abstract Factory. Her birinin kendine \u00f6zg\u00fc kullan\u0131m senaryolar\u0131 ve karma\u015f\u0131kl\u0131k seviyeleri vard\u0131r.<\/p>\n Simple Factory, resmi bir GoF deseni olmasa da, di\u011fer factory desenlerinin temelini olu\u015fturan ve s\u0131kl\u0131kla kullan\u0131lan bir yakla\u015f\u0131md\u0131r. Tek bir s\u0131n\u0131f\u0131n, belirli parametrelere g\u00f6re farkl\u0131 t\u00fcrde nesneler olu\u015fturma sorumlulu\u011funu \u00fcstlenmesidir. Bu fabrika s\u0131n\u0131f\u0131 genellikle statik bir metot i\u00e7erir veya bir Singleton olarak uygulan\u0131r.<\/p>\n Avantajlar\u0131:<\/strong> Dezavantajlar\u0131:<\/strong> Ne Zaman Kullan\u0131l\u0131r:<\/strong> Factory Method, GoF’un Creational desenlerinden biridir. Bu desende, bir s\u00fcper s\u0131n\u0131f (creator), nesne olu\u015fturmak i\u00e7in bir aray\u00fcz tan\u0131mlar, ancak hangi somut s\u0131n\u0131f\u0131n \u00f6rne\u011fini olu\u015fturaca\u011f\u0131na alt s\u0131n\u0131flar (concrete creators) karar verir. S\u00fcper s\u0131n\u0131f, alt s\u0131n\u0131flar\u0131n \u00f6rneklenece\u011fi s\u0131n\u0131f\u0131 ertelemi\u015f olur. Bu, istemcinin bir nesneyi do\u011frudan \u00f6rneklendirmek yerine, bir fabrika metodunu \u00e7a\u011f\u0131rmas\u0131 anlam\u0131na gelir.<\/p>\n Yap\u0131sal Bile\u015fenler:<\/strong> Avantajlar\u0131:<\/strong> Dezavantajlar\u0131:<\/strong> Ne Zaman Kullan\u0131l\u0131r:<\/strong> Abstract Factory, GoF’un bir di\u011fer Creational desenidir ve “fabrikalar\u0131n fabrikas\u0131” olarak da bilinir. Bu desen, birbiriyle ili\u015fkili veya ba\u011f\u0131ml\u0131 nesne ailelerini, somut s\u0131n\u0131flar\u0131n\u0131 belirtmeksizin olu\u015fturmak i\u00e7in bir aray\u00fcz sa\u011flar. Yani, bir Abstract Factory, birden fazla Factory Method’u i\u00e7erebilir ve bu factory method’lar, birbiriyle tutarl\u0131 bir \u00fcr\u00fcn ailesi olu\u015fturur.<\/p>\n Yap\u0131sal Bile\u015fenler:<\/strong> Avantajlar\u0131:<\/strong> Dezavantajlar\u0131:<\/strong> Ne Zaman Kullan\u0131l\u0131r:<\/strong> \u015eimdi bu \u00fc\u00e7 Factory deseni t\u00fcr\u00fcn\u00fc, bir “Pizza Sipari\u015f Sistemi” senaryosu \u00fczerinden Java kod \u00f6rnekleriyle inceleyelim.<\/p>\n Bu \u00f6rnekte, Bu \u00f6rnekte, farkl\u0131 pizza d\u00fckkanlar\u0131 (New York, Chicago) kendi pizza t\u00fcrlerini olu\u015fturmak i\u00e7in kendi fabrika metotlar\u0131n\u0131 uygular.<\/p>\n Bu \u00f6rnekte, farkl\u0131 pizza d\u00fckkanlar\u0131 (NY, Chicago) farkl\u0131 i\u00e7erik fabrikalar\u0131n\u0131 (ingredient factories) kullanarak kendi tarzlar\u0131na uygun pizza bile\u015fenlerini (hamur, sos, peynir) \u00fcretir.<\/p>\n Factory tasar\u0131m deseni, yaz\u0131l\u0131m geli\u015ftirmede bir\u00e7ok \u00f6nemli avantaj sunar:<\/p>\n * Gev\u015fek Ba\u011fl\u0131l\u0131k (Loose Coupling):<\/strong> En \u00f6nemli avantajlar\u0131ndan biridir. \u0130stemci kodu, somut \u00fcr\u00fcn s\u0131n\u0131flar\u0131n\u0131 do\u011frudan \u00f6rneklendirmek yerine bir fabrika arac\u0131l\u0131\u011f\u0131yla nesne talep eder. Bu, istemcinin somut s\u0131n\u0131flar hakk\u0131nda bilgi sahibi olmas\u0131n\u0131 engeller ve bile\u015fenler aras\u0131ndaki ba\u011f\u0131ml\u0131l\u0131\u011f\u0131 azalt\u0131r. Ba\u011f\u0131ml\u0131l\u0131k azald\u0131k\u00e7a, sistemin bir par\u00e7as\u0131 de\u011fi\u015fti\u011finde di\u011fer par\u00e7alar\u0131n etkilenme olas\u0131l\u0131\u011f\u0131 azal\u0131r. Factory deseni bir\u00e7ok fayda sa\u011flasa da, baz\u0131 dezavantajlar\u0131 da bulunmaktad\u0131r:<\/p>\n * Karma\u015f\u0131kl\u0131k:<\/strong> \u00d6zellikle Simple Factory d\u0131\u015f\u0131ndaki Factory Method ve Abstract Factory desenleri, daha fazla s\u0131n\u0131f ve aray\u00fcz gerektirir. Basit senaryolarda bu durum, gereksiz “a\u015f\u0131r\u0131 m\u00fchendislik” (over-engineering) olarak alg\u0131lanabilir ve kod taban\u0131n\u0131 gereksiz yere karma\u015f\u0131k hale getirebilir. Factory tasar\u0131m desenini ne zaman kullanaca\u011f\u0131n\u0131za karar vermek, projenizin ihtiya\u00e7lar\u0131na ve karma\u015f\u0131kl\u0131\u011f\u0131na ba\u011fl\u0131d\u0131r:<\/p>\n * Bir s\u0131n\u0131f\u0131n hangi alt s\u0131n\u0131flar\u0131n \u00f6rne\u011fini olu\u015fturmas\u0131 gerekti\u011fini \u00f6nceden bilemedi\u011finizde:<\/strong> Program\u0131n \u00e7al\u0131\u015fma zaman\u0131nda hangi somut s\u0131n\u0131f\u0131n \u00f6rne\u011fini olu\u015fturaca\u011f\u0131na karar vermesi gerekti\u011fi durumlarda (\u00f6rne\u011fin, kullan\u0131c\u0131 girdisine, konfig\u00fcrasyon ayarlar\u0131na veya ortam de\u011fi\u015fkenlerine g\u00f6re). Factory deseni, di\u011fer GoF desenleriyle birlikte veya onlar\u0131n bir par\u00e7as\u0131 olarak da kullan\u0131labilir:<\/p>\n * Singleton:<\/strong> Bir fabrika s\u0131n\u0131f\u0131n\u0131n kendisi, sistemde yaln\u0131zca bir \u00f6rne\u011finin bulunmas\u0131 gereken durumlarda Singleton deseni ile uygulanabilir. Bu, fabrika nesnesinin global bir eri\u015fim noktas\u0131 olmas\u0131n\u0131 sa\u011flar. Factory tasar\u0131m deseni, modern Java uygulamalar\u0131nda esneklik, geni\u015fletilebilirlik ve s\u00fcrd\u00fcr\u00fclebilirlik sa\u011flamak i\u00e7in vazge\u00e7ilmez bir ara\u00e7t\u0131r. Simple Factory, Factory Method ve Abstract Factory olmak \u00fczere farkl\u0131 varyasyonlar\u0131, nesne olu\u015fturma sorumlulu\u011funu istemci koddan soyutlayarak, uygulamalar\u0131n daha gev\u015fek ba\u011fl\u0131 ve y\u00f6netilebilir olmas\u0131na olanak tan\u0131r.<\/p>\n Do\u011fru Factory desenini se\u00e7mek, projenin karma\u015f\u0131kl\u0131\u011f\u0131na, \u00fcr\u00fcn t\u00fcrlerinin say\u0131s\u0131na ve gelecekteki de\u011fi\u015fiklik beklentilerine ba\u011fl\u0131d\u0131r. Basit senaryolar i\u00e7in Simple Factory yeterli olabilirken, daha dinamik ve geni\u015fletilebilir sistemler i\u00e7in Factory Method veya Abstract Factory daha uygun olacakt\u0131r. Ancak, desenleri a\u015f\u0131r\u0131 kullanmaktan ka\u00e7\u0131nmak ve her zaman en basit \u00e7\u00f6z\u00fcm\u00fc tercih etmek \u00f6nemlidir.<\/p>\n Factory deseni, nesne y\u00f6nelimli programlaman\u0131n temel prensiplerini (soyutlama, kaps\u00fclleme, Open\/Closed Prensibi) uygulamam\u0131za yard\u0131mc\u0131 olarak, daha robust, bak\u0131m\u0131 kolay ve \u00f6l\u00e7eklenebilir yaz\u0131l\u0131m sistemleri geli\u015ftirmemizin \u00f6n\u00fcn\u00fc a\u00e7ar. Bu deseni ustal\u0131kla kullanmak, yaz\u0131l\u0131m mimarinizi \u00f6nemli \u00f6l\u00e7\u00fcde g\u00fc\u00e7lendirecek ve geli\u015ftirme s\u00fcre\u00e7lerinizi daha verimli hale getirecektir.<\/body><\/p>\n","protected":false},"excerpt":{"rendered":"Java’da Factory Tasar\u0131m Deseni: Esnek ve \u00d6l\u00e7eklenebilir Uygulamalar Geli\u015ftirmek\nGiri\u015f\nYaz\u0131l\u0131m geli\u015ftirme s\u00fcre\u00e7leri, g\u00fcn\u00fcm\u00fcz\u00fcn karma\u015f\u0131","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"csco_page_header_type":"","csco_page_load_nextpost":"","csco_page_subscribe_form":"","csco_page_contact_form":"","footnotes":""},"categories":[1408],"tags":[],"class_list":{"0":"post-33432","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-java","7":"cs-entry","8":"cs-video-wrap"},"yoast_head":"\n
\n* Structural (Yap\u0131sal) Desenler:<\/strong> S\u0131n\u0131flar\u0131n ve nesnelerin daha b\u00fcy\u00fck yap\u0131lar olu\u015fturmak i\u00e7in nas\u0131l bir araya getirilece\u011fini ele al\u0131r. Adapter, Bridge, Composite, Decorator, Facade, Flyweight, Proxy bu kategoriye girer.
\n* Behavioral (Davran\u0131\u015fsal) Desenler:<\/strong> Nesneler aras\u0131ndaki ileti\u015fimi ve sorumluluk da\u011f\u0131l\u0131m\u0131n\u0131 y\u00f6netir. Chain of Responsibility, Command, Iterator, Mediator, Memento, Observer, State, Strategy, Template Method, Visitor bu kategoriye girer.<\/p>\n
\n* Kodun Anla\u015f\u0131l\u0131rl\u0131\u011f\u0131 ve Okunabilirli\u011fi:<\/strong> Desenler, geli\u015ftiriciler aras\u0131nda ortak bir dil ve yap\u0131 sa\u011flar.
\n* S\u00fcrd\u00fcr\u00fclebilirlik ve Geni\u015fletilebilirlik:<\/strong> Kodun gelecekteki de\u011fi\u015fikliklere daha az diren\u00e7 g\u00f6stermesini sa\u011flar.
\n* Gev\u015fek Ba\u011fl\u0131l\u0131k (Loose Coupling):<\/strong> Bile\u015fenler aras\u0131ndaki ba\u011f\u0131ml\u0131l\u0131klar\u0131 azaltarak sistemin daha esnek olmas\u0131n\u0131 sa\u011flar.
\n* Yeniden Kullan\u0131labilirlik:<\/strong> Desenler, kodun farkl\u0131 projelerde veya farkl\u0131 ba\u011flamlarda yeniden kullan\u0131lmas\u0131na olanak tan\u0131r.<\/p>\nFactory Tasar\u0131m Deseni Nedir?<\/h3>\n
new<\/code> anahtar kelimesiyle \u00f6rneklendirme ihtiyac\u0131n\u0131 ortadan kald\u0131r\u0131r. Bunun yerine, istemci bir fabrika (factory) nesnesiyle etkile\u015fime girer ve bu fabrika, istemcinin gereksinimlerine g\u00f6re do\u011fru nesneyi olu\u015fturur ve d\u00f6nd\u00fcr\u00fcr.<\/p>\n
\n* Nesne olu\u015fturma s\u00fcrecinin karma\u015f\u0131k oldu\u011fu, birden fazla ad\u0131mdan olu\u015ftu\u011fu veya belirli parametrelere ba\u011fl\u0131 oldu\u011fu durumlarda.
\n* \u0130stemci kodun, olu\u015fturulan nesnelerin somut t\u00fcrleri hakk\u0131nda bilgi sahibi olmas\u0131n\u0131 istemedi\u011fimizde, sadece ortak bir aray\u00fcz veya soyut s\u0131n\u0131f \u00fczerinden onlarla etkile\u015fim kurmas\u0131n\u0131 istedi\u011fimizde.<\/p>\nFactory Deseni’nin Bile\u015fenleri<\/h3>\n
\n* Somut \u00dcr\u00fcnler (Concrete Products):<\/strong> \u00dcr\u00fcn aray\u00fcz\u00fcn\u00fc uygulayan veya soyut s\u0131n\u0131f\u0131 geni\u015fleten ger\u00e7ek nesne s\u0131n\u0131flar\u0131d\u0131r. Fabrika bu s\u0131n\u0131flar\u0131n \u00f6rneklerini olu\u015fturur.
\n* Fabrika (Factory) Aray\u00fcz\u00fc\/Soyut S\u0131n\u0131f\u0131 (Opsiyonel):<\/strong> E\u011fer birden fazla fabrika t\u00fcr\u00fc olacaksa, fabrikalar i\u00e7in ortak bir aray\u00fcz veya soyut s\u0131n\u0131f tan\u0131mlanabilir. Bu, fabrika olu\u015fturma mant\u0131\u011f\u0131n\u0131n kendisini soyutlamak i\u00e7in kullan\u0131l\u0131r.
\n* Somut Fabrika (Concrete Factory):<\/strong> \u00dcr\u00fcn aray\u00fcz\u00fcn\u00fc uygulayan somut \u00fcr\u00fcnleri olu\u015fturan s\u0131n\u0131ft\u0131r. \u0130stemci genellikle bu fabrika ile etkile\u015fime girer.
\n* \u0130stemci (Client):<\/strong> Fabrika nesnesini kullanarak gerekli \u00fcr\u00fcn nesnesini talep eden ve onunla \u00e7al\u0131\u015fan koddur. \u0130stemci, somut \u00fcr\u00fcn s\u0131n\u0131flar\u0131n\u0131 do\u011frudan bilmez, sadece \u00fcr\u00fcn aray\u00fcz\u00fc \u00fczerinden \u00e7al\u0131\u015f\u0131r.<\/p>\nFactory Deseni’nin T\u00fcrleri<\/h3>\n
Simple Factory (Basit Fabrika)<\/h4>\n
\n* Uygulamas\u0131 olduk\u00e7a basittir.
\n* Nesne olu\u015fturma mant\u0131\u011f\u0131n\u0131 merkezile\u015ftirir.
\n* \u0130stemci kodunu somut \u00fcr\u00fcn s\u0131n\u0131flar\u0131ndan ay\u0131r\u0131r.<\/p>\n
\n* Yeni bir \u00fcr\u00fcn t\u00fcr\u00fc eklendi\u011finde fabrika s\u0131n\u0131f\u0131n\u0131n de\u011fi\u015ftirilmesi gerekir (if\/else<\/code> veya switch<\/code> blo\u011funa yeni bir durum eklenmesi), bu da Open\/Closed Prensibini ihlal eder.
\n* Fabrika s\u0131n\u0131f\u0131, t\u00fcm \u00fcr\u00fcn t\u00fcrleri hakk\u0131nda bilgi sahibi olmak zorunda kal\u0131r ve bu da “God Object” (Tanr\u0131 Nesnesi) riskini art\u0131r\u0131r.
\n* B\u00fcy\u00fck sistemlerde bak\u0131m\u0131 zorla\u015fabilir.<\/p>\n
\n* \u00dcr\u00fcn t\u00fcrlerinin say\u0131s\u0131 az ve de\u011fi\u015fme olas\u0131l\u0131\u011f\u0131 d\u00fc\u015f\u00fck oldu\u011funda.
\n* Nesne olu\u015fturma mant\u0131\u011f\u0131n\u0131n \u00e7ok karma\u015f\u0131k olmad\u0131\u011f\u0131 durumlarda.<\/p>\nFactory Method Deseni (Fabrika Metodu)<\/h4>\n
\n* Product (\u00dcr\u00fcn):<\/strong> Fabrika metodunun olu\u015fturdu\u011fu nesnelerin aray\u00fcz\u00fc veya soyut s\u0131n\u0131f\u0131.
\n* ConcreteProduct (Somut \u00dcr\u00fcn):<\/strong> Product aray\u00fcz\u00fcn\u00fc uygulayan somut s\u0131n\u0131flar.
\n* Creator (Olu\u015fturucu):<\/strong> Fabrika metodunu (nesne olu\u015fturma metodu) tan\u0131mlayan soyut s\u0131n\u0131f veya aray\u00fcz. Bu metodun d\u00f6n\u00fc\u015f tipi Product’t\u0131r. Creator s\u0131n\u0131f\u0131, genellikle fabrika metodunu \u00e7a\u011f\u0131ran di\u011fer metotlar\u0131 da i\u00e7erir.
\n* ConcreteCreator (Somut Olu\u015fturucu):<\/strong> Creator s\u0131n\u0131f\u0131n\u0131 geni\u015fleten ve fabrika metodunu uygulayarak belirli bir ConcreteProduct \u00f6rne\u011fi d\u00f6nd\u00fcren s\u0131n\u0131ft\u0131r.<\/p>\n
\n* Open\/Closed Prensibi’ne Uyum:<\/strong> Yeni bir \u00fcr\u00fcn t\u00fcr\u00fc eklendi\u011finde, mevcut fabrika metodunu i\u00e7eren s\u0131n\u0131flar\u0131 de\u011fi\u015ftirmeye gerek kalmaz; sadece yeni bir ConcreteProduct<\/code> ve ona kar\u015f\u0131l\u0131k gelen yeni bir ConcreteCreator<\/code> s\u0131n\u0131f\u0131 eklenir.
\n* Gev\u015fek Ba\u011fl\u0131l\u0131k:<\/strong> \u0130stemci kodu, somut \u00fcr\u00fcn s\u0131n\u0131flar\u0131ndan tamamen ayr\u0131l\u0131r.
\n* Esneklik:<\/strong> Alt s\u0131n\u0131flara, olu\u015fturulacak nesnenin t\u00fcr\u00fc \u00fczerinde kontrol sa\u011flar.
\n* Tek Sorumluluk Prensibi:<\/strong> Nesne olu\u015fturma sorumlulu\u011funu, nesnenin kendisinden ay\u0131r\u0131r.<\/p>\n
\n* Karma\u015f\u0131kl\u0131k:<\/strong> Simple Factory’ye g\u00f6re daha fazla s\u0131n\u0131f ve aray\u00fcz gerektirir, bu da kod taban\u0131n\u0131 daha karma\u015f\u0131k hale getirebilir.
\n* \u00d6\u011frenme E\u011frisi:<\/strong> Yeni ba\u015flayanlar i\u00e7in kavramas\u0131 ve uygulamas\u0131 daha zor olabilir.<\/p>\n
\n* Bir s\u0131n\u0131f\u0131n, hangi alt s\u0131n\u0131flar\u0131n \u00f6rne\u011fini olu\u015fturmas\u0131 gerekti\u011fini \u00f6nceden bilmedi\u011fi durumlarda.
\n* Bir k\u00fct\u00fcphane veya framework geli\u015ftirirken, kullan\u0131c\u0131lar\u0131n kendi bile\u015fenlerini geni\u015fletmesini ve kendi \u00f6zel \u00fcr\u00fcnlerini olu\u015fturmas\u0131n\u0131 istedi\u011finizde.
\n* Nesne olu\u015fturma s\u00fcrecini alt s\u0131n\u0131flara devretmek istedi\u011finizde.<\/p>\nAbstract Factory Deseni (Soyut Fabrika)<\/h4>\n
\n* AbstractProduct (Soyut \u00dcr\u00fcn):<\/strong> Her \u00fcr\u00fcn ailesindeki \u00fcr\u00fcnler i\u00e7in soyut aray\u00fczler (\u00f6rne\u011fin, Button<\/code>, Checkbox<\/code>).
\n* ConcreteProduct (Somut \u00dcr\u00fcn):<\/strong> AbstractProduct aray\u00fczlerini uygulayan somut \u00fcr\u00fcn s\u0131n\u0131flar\u0131 (\u00f6rne\u011fin, WindowsButton<\/code>, MacButton<\/code>).
\n* AbstractFactory (Soyut Fabrika):<\/strong> Her \u00fcr\u00fcn ailesi i\u00e7in bir Factory Method tan\u0131mlayan soyut aray\u00fcz. Bu metotlar, AbstractProduct t\u00fcr\u00fcnde nesneler d\u00f6nd\u00fcr\u00fcr.
\n* ConcreteFactory (Somut Fabrika):<\/strong> AbstractFactory aray\u00fcz\u00fcn\u00fc uygulayan ve belirli bir \u00fcr\u00fcn ailesine ait ConcreteProduct’lar\u0131 olu\u015fturan s\u0131n\u0131flar (\u00f6rne\u011fin, WindowsFactory<\/code>, MacFactory<\/code>).
\n* Client (\u0130stemci):<\/strong> AbstractFactory aray\u00fcz\u00fc \u00fczerinden fabrika ile etkile\u015fime girer ve \u00fcr\u00fcnleri olu\u015fturur. \u0130stemci, somut fabrika veya somut \u00fcr\u00fcn s\u0131n\u0131flar\u0131n\u0131 bilmez.<\/p>\n
\n* \u00dcr\u00fcn Ailelerinin Tutarl\u0131l\u0131\u011f\u0131:<\/strong> \u0130stemcinin her zaman birbiriyle uyumlu \u00fcr\u00fcnler ailesi kullanmas\u0131n\u0131 garanti eder.
\n* \u0130stemciyi Somut S\u0131n\u0131flardan Tamamen Ay\u0131rma:<\/strong> \u0130stemci, olu\u015fturulan \u00fcr\u00fcnlerin somut t\u00fcrleri hakk\u0131nda hi\u00e7bir bilgiye sahip de\u011fildir.
\n* Yeni \u00dcr\u00fcn Aileleri Ekleme Kolayl\u0131\u011f\u0131:<\/strong> Yeni bir \u00fcr\u00fcn ailesi eklemek, mevcut istemci kodunu etkilemez; sadece yeni bir ConcreteFactory<\/code> ve ConcreteProduct<\/code> s\u0131n\u0131flar\u0131 eklenir.<\/p>\n
\n* Yeni \u00dcr\u00fcn T\u00fcrleri Ekleme Zorlu\u011fu:<\/strong> Mevcut bir \u00fcr\u00fcn ailesine yeni bir \u00fcr\u00fcn t\u00fcr\u00fc (\u00f6rne\u011fin, Radio Button<\/code> eklemek) eklemek, AbstractFactory<\/code> aray\u00fcz\u00fcn\u00fc ve t\u00fcm ConcreteFactory<\/code> uygulamalar\u0131n\u0131 de\u011fi\u015ftirmeyi gerektirir. Bu, Open\/Closed Prensibi’ne ayk\u0131r\u0131 olabilir.
\n* Karma\u015f\u0131kl\u0131k:<\/strong> En karma\u015f\u0131k Factory desenidir ve \u00e7ok say\u0131da s\u0131n\u0131f ve aray\u00fcz gerektirebilir.<\/p>\n
\n* Bir sistemin, birbiriyle ili\u015fkili veya ba\u011f\u0131ml\u0131 nesne ailelerinden birini se\u00e7mesi gerekti\u011finde.
\n* Bir \u00fcr\u00fcn ailesinin, somut s\u0131n\u0131flar\u0131n\u0131 belirtmeden olu\u015fturulmas\u0131 gerekti\u011finde.
\n* Bir sistemin, farkl\u0131 platformlar veya konfig\u00fcrasyonlar i\u00e7in farkl\u0131 davran\u0131\u015flar sergileyen \u00fcr\u00fcnler ailesi kullanmas\u0131 gerekti\u011finde (\u00f6rne\u011fin, farkl\u0131 i\u015fletim sistemleri i\u00e7in UI bile\u015fenleri).<\/p>\nKod \u00d6rnekleri<\/h3>\n
Simple Factory \u00d6rne\u011fi<\/h4>\n
SimplePizzaFactory<\/code> s\u0131n\u0131f\u0131, farkl\u0131 pizza t\u00fcrlerini olu\u015fturma sorumlulu\u011funu \u00fcstlenir.<\/p>\n\/\/ 1. \u00dcr\u00fcn Aray\u00fcz\u00fc\ninterface Pizza {\n void prepare();\n void bake();\n void cut();\n void box();\n}\n\n\/\/ 2. Somut \u00dcr\u00fcnler\nclass CheesePizza implements Pizza {\n @Override\n public void prepare() {\n System.out.println(\"Peynirli Pizza haz\u0131rlan\u0131yor...\");\n }\n @Override\n public void bake() {\n System.out.println(\"Peynirli Pizza pi\u015firiliyor...\");\n }\n @Override\n public void cut() {\n System.out.println(\"Peynirli Pizza kesiliyor...\");\n }\n @Override\n public void box() {\n System.out.println(\"Peynirli Pizza kutulan\u0131yor...\");\n }\n}\n\nclass VeggiePizza implements Pizza {\n @Override\n public void prepare() {\n System.out.println(\"Vejetaryen Pizza haz\u0131rlan\u0131yor...\");\n }\n @Override\n public void bake() {\n System.out.println(\"Vejetaryen Pizza pi\u015firiliyor...\");\n }\n @Override\n public void cut() {\n System.out.println(\"Vejetaryen Pizza kesiliyor...\");\n }\n @Override\n public void box() {\n System.out.println(\"Vejetaryen Pizza kutulan\u0131yor...\");\n }\n}\n\n\/\/ 3. Basit Fabrika\nclass SimplePizzaFactory {\n public Pizza createPizza(String type) {\n Pizza pizza = null;\n if (type.equals(\"cheese\")) {\n pizza = new CheesePizza();\n } else if (type.equals(\"veggie\")) {\n pizza = new VeggiePizza();\n }\n \/\/ Yeni pizza t\u00fcrleri eklendi\u011finde bu metodun de\u011fi\u015ftirilmesi gerekir.\n return pizza;\n }\n}\n\n\/\/ 4. \u0130stemci\nclass PizzaStore {\n SimplePizzaFactory factory;\n\n public PizzaStore(SimplePizzaFactory factory) {\n this.factory = factory;\n }\n\n public Pizza orderPizza(String type) {\n Pizza pizza;\n pizza = factory.createPizza(type); \/\/ Fabrika kullanarak pizza olu\u015fturulur\n\n pizza.prepare();\n pizza.bake();\n pizza.cut();\n pizza.box();\n\n return pizza;\n }\n}\n\n\/\/ Kullan\u0131m\npublic class SimpleFactoryDemo {\n public static void main(String[] args) {\n SimplePizzaFactory factory = new SimplePizzaFactory();\n PizzaStore store = new PizzaStore(factory);\n\n System.out.println(\"--- Peynirli Pizza Sipari\u015fi ---\");\n Pizza cheesePizza = store.orderPizza(\"cheese\");\n System.out.println(\"Sipari\u015f edilen: \" + cheesePizza.getClass().getSimpleName() + \"\\n\");\n\n System.out.println(\"--- Vejetaryen Pizza Sipari\u015fi ---\");\n Pizza veggiePizza = store.orderPizza(\"veggie\");\n System.out.println(\"Sipari\u015f edilen: \" + veggiePizza.getClass().getSimpleName() + \"\\n\");\n }\n}<\/code><\/pre>\nFactory Method \u00d6rne\u011fi<\/h4>\n
\/\/ 1. \u00dcr\u00fcn Aray\u00fcz\u00fc (Simple Factory'deki ile ayn\u0131 kalabilir)\n\/\/ interface Pizza { ... }\n\/\/ class CheesePizza implements Pizza { ... }\n\/\/ class VeggiePizza implements Pizza { ... }\n\/\/ Yukar\u0131daki Pizza aray\u00fcz\u00fc ve somut s\u0131n\u0131flar burada da kullan\u0131labilir.\n\/\/ Yeniden tan\u0131mlamak yerine var oldu\u011funu varsayal\u0131m.\n\n\/\/ 2. Soyut Olu\u015fturucu (Creator)\nabstract class PizzaStoreFM {\n public Pizza orderPizza(String type) {\n Pizza pizza;\n pizza = createPizza(type); \/\/ Fabrika metodu \u00e7a\u011fr\u0131l\u0131r\n\n pizza.prepare();\n pizza.bake();\n pizza.cut();\n pizza.box();\n\n return pizza;\n }\n\n \/\/ Bu, Factory Metodudur. Alt s\u0131n\u0131flar bunu uygulayarak hangi pizzay\u0131 olu\u015fturacaklar\u0131na karar verir.\n protected abstract Pizza createPizza(String type);\n}\n\n\/\/ 3. Somut Olu\u015fturucular (Concrete Creators)\nclass NYPizzaStore extends PizzaStoreFM {\n @Override\n protected Pizza createPizza(String type) {\n if (type.equals(\"cheese\")) {\n return new NYStyleCheesePizza(); \/\/ NY tarz\u0131 peynirli pizza\n } else if (type.equals(\"veggie\")) {\n return new NYStyleVeggiePizza(); \/\/ NY tarz\u0131 vejetaryen pizza\n }\n return null;\n }\n}\n\nclass ChicagoPizzaStore extends PizzaStoreFM {\n @Override\n protected Pizza createPizza(String type) {\n if (type.equals(\"cheese\")) {\n return new ChicagoStyleCheesePizza(); \/\/ Chicago tarz\u0131 peynirli pizza\n } else if (type.equals(\"veggie\")) {\n return new ChicagoStyleVeggiePizza(); \/\/ Chicago tarz\u0131 vejetaryen pizza\n }\n return null;\n }\n}\n\n\/\/ 4. Somut \u00dcr\u00fcnler (Concrete Products) - NY ve Chicago tarz\u0131 pizzalar\nclass NYStyleCheesePizza implements Pizza {\n public NYStyleCheesePizza() {\n System.out.println(\"NY Style Peynirli Pizza olu\u015fturuluyor.\");\n }\n @Override public void prepare() { System.out.println(\"NY Peynirli Pizza haz\u0131rlan\u0131yor...\"); }\n @Override public void bake() { System.out.println(\"NY Peynirli Pizza pi\u015firiliyor...\"); }\n @Override public void cut() { System.out.println(\"NY Peynirli Pizza kesiliyor...\"); }\n @Override public void box() { System.out.println(\"NY Peynirli Pizza kutulan\u0131yor...\"); }\n}\n\nclass NYStyleVeggiePizza implements Pizza {\n public NYStyleVeggiePizza() {\n System.out.println(\"NY Style Vejetaryen Pizza olu\u015fturuluyor.\");\n }\n @Override public void prepare() { System.out.println(\"NY Vejetaryen Pizza haz\u0131rlan\u0131yor...\"); }\n @Override public void bake() { System.out.println(\"NY Vejetaryen Pizza pi\u015firiliyor...\"); }\n @Override public void cut() { System.out.println(\"NY Vejetaryen Pizza kesiliyor...\"); }\n @Override public void box() { System.out.println(\"NY Vejetaryen Pizza kutulan\u0131yor...\"); }\n}\n\nclass ChicagoStyleCheesePizza implements Pizza {\n public ChicagoStyleCheesePizza() {\n System.out.println(\"Chicago Style Peynirli Pizza olu\u015fturuluyor.\");\n }\n @Override public void prepare() { System.out.println(\"Chicago Peynirli Pizza haz\u0131rlan\u0131yor...\"); }\n @Override public void bake() { System.out.println(\"Chicago Peynirli Pizza pi\u015firiliyor...\"); }\n @Override public void cut() { System.out.println(\"Chicago Peynirli Pizza kesiliyor...\"); }\n @Override public void box() { System.out.println(\"Chicago Peynirli Pizza kutulan\u0131yor...\"); }\n}\n\nclass ChicagoStyleVeggiePizza implements Pizza {\n public ChicagoStyleVeggiePizza() {\n System.out.println(\"Chicago Style Vejetaryen Pizza olu\u015fturuluyor.\");\n }\n @Override public void prepare() { System.out.println(\"Chicago Vejetaryen Pizza haz\u0131rlan\u0131yor...\"); }\n @Override public void bake() { System.out.println(\"Chicago Vejetaryen Pizza pi\u015firiliyor...\"); }\n @Override public void cut() { System.out.println(\"Chicago Vejetaryen Pizza kesiliyor...\"); }\n @Override public void box() { System.out.println(\"Chicago Vejetaryen Pizza kutulan\u0131yor...\"); }\n}\n\n\n\/\/ Kullan\u0131m\npublic class FactoryMethodDemo {\n public static void main(String[] args) {\n PizzaStoreFM nyStore = new NYPizzaStore();\n PizzaStoreFM chicagoStore = new ChicagoPizzaStore();\n\n System.out.println(\"--- NY Peynirli Pizza Sipari\u015fi ---\");\n Pizza pizza = nyStore.orderPizza(\"cheese\");\n System.out.println(\"Ethan sipari\u015f etti: \" + pizza.getClass().getSimpleName() + \"\\n\");\n\n System.out.println(\"--- Chicago Vejetaryen Pizza Sipari\u015fi ---\");\n pizza = chicagoStore.orderPizza(\"veggie\");\n System.out.println(\"Joel sipari\u015f etti: \" + pizza.getClass().getSimpleName() + \"\\n\");\n }\n}<\/code><\/pre>\nAbstract Factory \u00d6rne\u011fi<\/h4>\n
\/\/ 1. Soyut \u00dcr\u00fcnler (Pizza Bile\u015fenleri)\ninterface Dough { String toString(); }\ninterface Sauce { String toString(); }\ninterface Cheese { String toString(); }\n\n\/\/ 2. Somut \u00dcr\u00fcnler (NY ve Chicago tarz\u0131 bile\u015fenler)\nclass ThinCrustDough implements Dough { public String toString() { return \"\u0130nce Hamur\"; } }\nclass ThickCrustDough implements Dough { public String toString() { return \"Kal\u0131n Hamur\"; } }\n\nclass MarinaraSauce implements Sauce { public String toString() { return \"Marinara Sos\"; } }\nclass PlumTomatoSauce implements Sauce { public String toString() { return \"Erik Domates Sos\"; } }\n\nclass ReggianoCheese implements Cheese { public String toString() { return \"Reggiano Peyniri\"; } }\nclass MozzarellaCheese implements Cheese { public String toString() { return \"Mozzarella Peyniri\"; } }\n\n\/\/ 3. Soyut Fabrika (Pizza Malzeme Fabrikas\u0131)\ninterface PizzaIngredientFactory {\n Dough createDough();\n Sauce createSauce();\n Cheese createCheese();\n}\n\n\/\/ 4. Somut Fabrikalar (NY ve Chicago Malzeme Fabrikalar\u0131)\nclass NYPizzaIngredientFactory implements PizzaIngredientFactory {\n @Override public Dough createDough() { return new ThinCrustDough(); }\n @Override public Sauce createSauce() { return new MarinaraSauce(); }\n @Override public Cheese createCheese() { return new ReggianoCheese(); }\n}\n\nclass ChicagoPizzaIngredientFactory implements PizzaIngredientFactory {\n @Override public Dough createDough() { return new ThickCrustDough(); }\n @Override public Sauce createSauce() { return new PlumTomatoSauce(); }\n @Override public Cheese createCheese() { return new MozzarellaCheese(); }\n}\n\n\/\/ 5. Soyut Pizza S\u0131n\u0131f\u0131 (Malzeme Fabrikas\u0131n\u0131 kullanan)\nabstract class PizzaAF {\n String name;\n Dough dough;\n Sauce sauce;\n Cheese cheese;\n\n abstract void prepare(); \/\/ Bu metot, malzemelerin nas\u0131l haz\u0131rlanaca\u011f\u0131n\u0131 belirler\n\n void bake() { System.out.println(\"15 dakika 350 derecede pi\u015firiliyor.\"); }\n void cut() { System.out.println(\"Pizzay\u0131 dilimlere ay\u0131r\u0131n.\"); }\n void box() { System.out.println(\"Pizzay\u0131 resmi PizzaStore kutusuna koyun.\"); }\n\n public void setName(String name) { this.name = name; }\n public String getName() { return name; }\n public String toString() {\n return \"---- \" + name + \" ----\\n\" +\n dough + \"\\n\" +\n sauce + \"\\n\" +\n cheese + \"\\n\";\n }\n}\n\n\/\/ 6. Somut Pizzalar (Malzeme Fabrikas\u0131 kullanarak kendi malzemelerini belirler)\nclass CheesePizzaAF extends PizzaAF {\n PizzaIngredientFactory ingredientFactory;\n\n public CheesePizzaAF(PizzaIngredientFactory ingredientFactory) {\n this.ingredientFactory = ingredientFactory;\n }\n\n @Override\n void prepare() {\n System.out.println(\"Haz\u0131rlan\u0131yor: \" + name);\n dough = ingredientFactory.createDough();\n sauce = ingredientFactory.createSauce();\n cheese = ingredientFactory.createCheese();\n }\n}\n\nclass VeggiePizzaAF extends PizzaAF {\n PizzaIngredientFactory ingredientFactory;\n\n public VeggiePizzaAF(PizzaIngredientFactory ingredientFactory) {\n this.ingredientFactory = ingredientFactory;\n }\n\n @Override\n void prepare() {\n System.out.println(\"Haz\u0131rlan\u0131yor: \" + name);\n dough = ingredientFactory.createDough();\n sauce = ingredientFactory.createSauce();\n cheese = ingredientFactory.createCheese();\n \/\/ Ekstra sebzeler eklenebilir\n }\n}\n\n\/\/ 7. Soyut Pizza D\u00fckkan\u0131 (Abstract Factory'yi kullanan istemci)\nabstract class PizzaStoreAF {\n public PizzaAF orderPizza(String type) {\n PizzaAF pizza = createPizza(type); \/\/ Alt s\u0131n\u0131flar pizzay\u0131 olu\u015fturur\n pizza.prepare();\n pizza.bake();\n pizza.cut();\n pizza.box();\n return pizza;\n }\n\n protected abstract PizzaAF createPizza(String type); \/\/ Fabrika metodu\n}\n\n\/\/ 8. Somut Pizza D\u00fckkanlar\u0131\nclass NYPizzaStoreAF extends PizzaStoreAF {\n @Override\n protected PizzaAF createPizza(String item) {\n PizzaAF pizza = null;\n PizzaIngredientFactory ingredientFactory = new NYPizzaIngredientFactory(); \/\/ NY tarz\u0131 malzeme fabrikas\u0131\n\n if (item.equals(\"cheese\")) {\n pizza = new CheesePizzaAF(ingredientFactory);\n pizza.setName(\"New York Tarz\u0131 Peynirli Pizza\");\n } else if (item.equals(\"veggie\")) {\n pizza = new VeggiePizzaAF(ingredientFactory);\n pizza.setName(\"New York Tarz\u0131 Vejetaryen Pizza\");\n }\n return pizza;\n }\n}\n\nclass ChicagoPizzaStoreAF extends PizzaStoreAF {\n @Override\n protected PizzaAF createPizza(String item) {\n PizzaAF pizza = null;\n PizzaIngredientFactory ingredientFactory = new ChicagoPizzaIngredientFactory(); \/\/ Chicago tarz\u0131 malzeme fabrikas\u0131\n\n if (item.equals(\"cheese\")) {\n pizza = new CheesePizzaAF(ingredientFactory);\n pizza.setName(\"Chicago Tarz\u0131 Peynirli Pizza\");\n } else if (item.equals(\"veggie\")) {\n pizza = new VeggiePizzaAF(ingredientFactory);\n pizza.setName(\"Chicago Tarz\u0131 Vejetaryen Pizza\");\n }\n return pizza;\n }\n}\n\n\/\/ Kullan\u0131m\npublic class AbstractFactoryDemo {\n public static void main(String[] args) {\n PizzaStoreAF nyStore = new NYPizzaStoreAF();\n PizzaStoreAF chicagoStore = new ChicagoPizzaStoreAF();\n\n System.out.println(\"--- NY Peynirli Pizza Sipari\u015fi ---\");\n PizzaAF pizza = nyStore.orderPizza(\"cheese\");\n System.out.println(\"Ethan sipari\u015f etti: \" + pizza.getName() + \"\\n\" + pizza);\n\n System.out.println(\"--- Chicago Vejetaryen Pizza Sipari\u015fi ---\");\n pizza = chicagoStore.orderPizza(\"veggie\");\n System.out.println(\"Joel sipari\u015f etti: \" + pizza.getName() + \"\\n\" + pizza);\n }\n}<\/code><\/pre>\nFactory Deseni’nin Avantajlar\u0131<\/h3>\n
\n* Esneklik ve Geni\u015fletilebilirlik:<\/strong> Yeni \u00fcr\u00fcn t\u00fcrleri veya \u00fcr\u00fcn aileleri eklendi\u011finde, mevcut istemci kodunu de\u011fi\u015ftirmeye gerek kalmaz. \u00d6zellikle Factory Method ve Abstract Factory desenlerinde, sadece yeni bir somut \u00fcr\u00fcn s\u0131n\u0131f\u0131 ve\/veya fabrika s\u0131n\u0131f\u0131 eklenmesi yeterlidir. Bu, uygulaman\u0131n gelecekteki de\u011fi\u015fikliklere daha kolay adapte olmas\u0131n\u0131 sa\u011flar.
\n* Open\/Closed Prensibi’ne Uyum:<\/strong> Yaz\u0131l\u0131m varl\u0131klar\u0131n\u0131n geni\u015fletmeye a\u00e7\u0131k, de\u011fi\u015ftirmeye kapal\u0131 olmas\u0131 gerekti\u011fini belirten bu prensibe uyum sa\u011flar. Yeni bir \u00fcr\u00fcn tipi eklemek, mevcut fabrika veya istemci kodunu de\u011fi\u015ftirmeyi gerektirmez, sadece yeni s\u0131n\u0131flar eklenir.
\n* Kodun Okunabilirli\u011fi ve Bak\u0131m\u0131:<\/strong> Nesne olu\u015fturma mant\u0131\u011f\u0131n\u0131 tek bir yerde (fabrika s\u0131n\u0131f\u0131nda) merkezile\u015ftirir. Bu, kodun daha d\u00fczenli ve anla\u015f\u0131l\u0131r olmas\u0131n\u0131 sa\u011flar. Karma\u015f\u0131k nesne olu\u015fturma s\u00fcre\u00e7leri, fabrika i\u00e7inde kaps\u00fcllendi\u011fi i\u00e7in istemci kod daha temiz kal\u0131r.
\n* Test Edilebilirlik:<\/strong> Gev\u015fek ba\u011fl\u0131l\u0131k sayesinde, test yazarken ger\u00e7ek nesneler yerine mock veya stub nesneler kullan\u0131labilir. Bu, birim testlerini daha kolay ve izole hale getirir. \u00d6rne\u011fin, bir fabrika aray\u00fcz\u00fcn\u00fc taklit ederek, istemci kodun do\u011fru nesneleri olu\u015fturup olu\u015fturmad\u0131\u011f\u0131n\u0131 test edebilirsiniz.
\n* Sorumluluklar\u0131n Ayr\u0131lmas\u0131 (Separation of Concerns):<\/strong> Nesne olu\u015fturma sorumlulu\u011funu, nesnelerin i\u015f mant\u0131\u011f\u0131 sorumlulu\u011fundan ay\u0131r\u0131r. Her s\u0131n\u0131f\u0131n tek bir sorumlulu\u011fu olmas\u0131 gerekti\u011fini belirten Tek Sorumluluk Prensibi’ne (Single Responsibility Principle) uyumu art\u0131r\u0131r.<\/p>\nFactory Deseni’nin Dezavantajlar\u0131<\/h3>\n
\n* \u00d6\u011frenme E\u011frisi:<\/strong> Tasar\u0131m desenlerine yeni ba\u015flayan geli\u015ftiriciler i\u00e7in, \u00f6zellikle Abstract Factory gibi daha soyut desenleri kavramak ve do\u011fru bir \u015fekilde uygulamak zor olabilir.
\n* Soyutlama Maliyeti:<\/strong> Ek soyutlama katmanlar\u0131, kodun takip edilmesini ve hata ay\u0131klamas\u0131n\u0131 bazen daha zor hale getirebilir. Her zaman bir fabrika kullanmak yerine, basit durumlarda do\u011frudan new<\/code> anahtar kelimesini kullanmak daha pratik olabilir.
\n* Abstract Factory’de Yeni \u00dcr\u00fcn T\u00fcr\u00fc Ekleme Zorlu\u011fu:<\/strong> Abstract Factory deseninin temel dezavantajlar\u0131ndan biri, mevcut bir \u00fcr\u00fcn ailesine yeni bir \u00fcr\u00fcn t\u00fcr\u00fc eklendi\u011finde ortaya \u00e7\u0131kar. Bu durumda, AbstractFactory<\/code> aray\u00fcz\u00fcn\u00fcn ve t\u00fcm ConcreteFactory<\/code> uygulamalar\u0131n\u0131n de\u011fi\u015ftirilmesi gerekir. Bu, Open\/Closed Prensibi’ne ayk\u0131r\u0131 bir durum olu\u015fturur ve ciddi bak\u0131m maliyetlerine yol a\u00e7abilir.<\/p>\nNe Zaman Kullanmal\u0131?<\/h3>\n
\n* Bir k\u00fct\u00fcphane veya framework geli\u015ftirirken:<\/strong> Kullan\u0131c\u0131lar\u0131n kendi bile\u015fenlerini (\u00fcr\u00fcnlerini) geni\u015fletmesini ve sizin kodunuzun bu bile\u015fenleri standart bir aray\u00fcz \u00fczerinden kullanmas\u0131n\u0131 istedi\u011finizde.
\n* Birbiriyle ili\u015fkili nesne aileleri olu\u015fturman\u0131z gerekti\u011finde (Abstract Factory):<\/strong> Birbirine ba\u011f\u0131ml\u0131 birden fazla \u00fcr\u00fcn t\u00fcr\u00fcn\u00fc bir arada olu\u015fturman\u0131z ve bu \u00fcr\u00fcnlerin her zaman tutarl\u0131 bir aileye ait olmas\u0131n\u0131 garanti etmeniz gerekti\u011finde.
\n* Nesne olu\u015fturma s\u00fcrecini istemci koddan ay\u0131rmak istedi\u011finizde:<\/strong> \u0130stemci kodun, olu\u015fturulan nesnelerin somut t\u00fcrleri hakk\u0131nda bilgi sahibi olmas\u0131n\u0131 istemedi\u011finizde ve sadece ortak bir aray\u00fcz \u00fczerinden onlarla etkile\u015fim kurmas\u0131n\u0131 istedi\u011finizde.
\n* Tek bir s\u0131n\u0131f\u0131n birden fazla alt s\u0131n\u0131f\u0131ndan sorumlu olmas\u0131n\u0131 istemedi\u011finizde:<\/strong> new<\/code> operat\u00f6r\u00fcn\u00fcn yayg\u0131n kullan\u0131m\u0131n\u0131 azaltarak, bir s\u0131n\u0131f\u0131n \u00e7ok fazla ba\u011f\u0131ml\u0131l\u0131\u011fa sahip olmas\u0131n\u0131 engellemek istedi\u011finizde.<\/p>\nDi\u011fer Tasar\u0131m Desenleriyle \u0130li\u015fkisi<\/h3>\n
\n* Prototype:<\/strong> Factory Method deseni, bazen Prototype deseni ile birlikte kullan\u0131labilir. Fabrika metodu, yeni nesneler olu\u015fturmak yerine, mevcut prototip nesneleri kopyalayarak (clone) d\u00f6nd\u00fcrebilir. Bu, \u00f6zellikle nesne olu\u015fturma maliyetinin y\u00fcksek oldu\u011fu durumlarda faydal\u0131d\u0131r.
\n* Builder:<\/strong> Hem Factory hem de Builder desenleri nesne olu\u015fturma desenleridir. Factory deseni, genellikle tek bir ad\u0131mda veya basit bir parametreye g\u00f6re bir nesne olu\u015ftururken, Builder deseni karma\u015f\u0131k nesnelerin ad\u0131m ad\u0131m, farkl\u0131 konfig\u00fcrasyonlarla olu\u015fturulmas\u0131n\u0131 sa\u011flar. Karma\u015f\u0131k bir nesne olu\u015fturma s\u00fcreci varsa Builder daha uygun olabilir; basit nesneler i\u00e7in Factory daha iyidir.
\n* Strategy:<\/strong> Fabrika, istemcinin bir strateji se\u00e7mesine izin verebilir ve bu stratejiyi uygulayan bir nesneyi d\u00f6nd\u00fcrebilir. \u00d6rne\u011fin, bir \u00f6deme fabrika, farkl\u0131 \u00f6deme y\u00f6ntemleri (kredi kart\u0131, PayPal) i\u00e7in strateji nesneleri olu\u015fturabilir.<\/p>\nSonu\u00e7<\/h3>\n