{"id":27906,"date":"2025-08-20T16:05:57","date_gmt":"2025-08-20T13:05:57","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/?p=27906"},"modified":"2025-08-20T16:05:57","modified_gmt":"2025-08-20T13:05:57","slug":"yazilim-gelistirmede-solid-prensipleri-saglam-ve-esnek-kodlama-icin-rehber","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/yazilim-gelistirmede-solid-prensipleri-saglam-ve-esnek-kodlama-icin-rehber\/","title":{"rendered":"Yaz\u0131l\u0131m Geli\u015ftirmede SOLID Prensipleri: Sa\u011flam ve Esnek Kodlama \u0130\u00e7in Rehber"},"content":{"rendered":"<p class=\"ds-markdown-paragraph\">Yaz\u0131l\u0131m d\u00fcnyas\u0131nda, projeler b\u00fcy\u00fcd\u00fck\u00e7e kod tabanlar\u0131n\u0131n karma\u015f\u0131kl\u0131\u011f\u0131 da artar. Bu karma\u015f\u0131kl\u0131kla ba\u015f etmenin, kodunuzu esnek, anla\u015f\u0131l\u0131r, s\u00fcrd\u00fcr\u00fclebilir ve test edilebilir k\u0131lman\u0131n anahtar\u0131, kan\u0131tlanm\u0131\u015f tasar\u0131m prensiplerini uygulamaktan ge\u00e7er. \u0130\u015fte\u00a0<strong>SOLID prensipleri<\/strong>\u00a0tam olarak bu noktada devreye girer.<\/p>\n<p class=\"ds-markdown-paragraph\">Robert C. Martin (nam-\u0131 di\u011fer &#8220;Uncle Bob&#8221;) taraf\u0131ndan ortaya konan SOLID, Nesne Y\u00f6nelimli Programlama (OOP) i\u00e7in be\u015f alt\u0131n kural\u0131 temsil eden bir akronimdir. Bu makalede, her bir prensibi detayl\u0131ca inceleyecek, neden \u00f6nemli olduklar\u0131n\u0131 anlayacak ve PHP dilinden \u00f6rneklerle nas\u0131l uyguland\u0131klar\u0131n\u0131 g\u00f6rece\u011fiz.<\/p>\n<p data-start=\"641\" data-end=\"720\">SOLID, be\u015f temel nesne y\u00f6nelimli tasar\u0131m prensibinin ba\u015f harflerinden olu\u015fur:<\/p>\n<ul data-start=\"722\" data-end=\"1076\">\n<li data-start=\"722\" data-end=\"791\">\n<p data-start=\"724\" data-end=\"791\"><strong data-start=\"724\" data-end=\"729\">S<\/strong> \u2013 Single Responsibility Principle (Tek Sorumluluk Prensibi)<\/p>\n<\/li>\n<li data-start=\"792\" data-end=\"848\">\n<p data-start=\"794\" data-end=\"848\"><strong data-start=\"794\" data-end=\"799\">O<\/strong> \u2013 Open-Closed Principle (A\u00e7\u0131k-Kapal\u0131 Prensibi)<\/p>\n<\/li>\n<li data-start=\"849\" data-end=\"921\">\n<p data-start=\"851\" data-end=\"921\"><strong data-start=\"851\" data-end=\"856\">L<\/strong> \u2013 Liskov Substitution Principle (Liskov Yerine Ge\u00e7me Prensibi)<\/p>\n<\/li>\n<li data-start=\"922\" data-end=\"990\">\n<p data-start=\"924\" data-end=\"990\"><strong data-start=\"924\" data-end=\"929\">I<\/strong> \u2013 Interface Segregation Principle (Aray\u00fcz Ayr\u0131m\u0131 Prensibi)<\/p>\n<\/li>\n<li data-start=\"991\" data-end=\"1076\">\n<p data-start=\"993\" data-end=\"1076\"><strong data-start=\"993\" data-end=\"998\">D<\/strong> \u2013 Dependency Inversion Principle (Ba\u011f\u0131ml\u0131l\u0131klar\u0131n Ters \u00c7evrilmesi Prensibi)<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"1078\" data-end=\"1241\">Bu prensipler yaln\u0131zca teorik kavramlar de\u011fil; uyguland\u0131klar\u0131nda yaz\u0131l\u0131mc\u0131ya daha <strong data-start=\"1160\" data-end=\"1207\">temiz, okunabilir, test edilebilir ve esnek<\/strong> yaz\u0131l\u0131m geli\u015ftirme imk\u00e2n\u0131 sa\u011flar.<\/p>\n<h3><strong>SOLID Neden \u00d6nemlidir?<\/strong><\/h3>\n<p class=\"ds-markdown-paragraph\">SOLID prensipleri, yaz\u0131l\u0131m geli\u015ftirmede kar\u015f\u0131la\u015f\u0131lan \u015fu d\u00f6rt temel soruna \u00e7\u00f6z\u00fcm sunar:<\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Rijitlik (Rigidity):<\/strong>\u00a0Bir de\u011fi\u015fiklik yapman\u0131n, bir dizi ba\u015fka ili\u015fkili de\u011fi\u015fikli\u011fi zorunlu k\u0131lmas\u0131.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>K\u0131r\u0131lganl\u0131k (Fragility):<\/strong>\u00a0Yap\u0131lan bir de\u011fi\u015fikli\u011fin, g\u00f6r\u00fcn\u00fc\u015fte ilgisiz ba\u015fka yerlerde beklenmedik hatalara neden olmas\u0131.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Hareketsizlik (Immobility):<\/strong>\u00a0Kod par\u00e7alar\u0131n\u0131 ba\u015fka projelerde yeniden kullanman\u0131n zor olmas\u0131 \u00e7\u00fcnk\u00fc sistem i\u00e7inde s\u0131k\u0131 s\u0131k\u0131ya ba\u011fl\u0131d\u0131rlar.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>A\u011f\u0131rl\u0131k (Viscosity):<\/strong>\u00a0Do\u011fru olan\u0131 yapman\u0131n (prensiplere uygun), &#8216;h\u0131zl\u0131 ve kirli&#8217; \u00e7\u00f6z\u00fcmden daha zor ve zahmetli hale gelmesi.<\/p>\n<\/li>\n<\/ul>\n<p class=\"ds-markdown-paragraph\">SOLID, bu sorunlar\u0131 azaltarak daha\u00a0<strong>Agile<\/strong>\u00a0(\u00e7evik) ve\u00a0<strong>Adaptive<\/strong>\u00a0(uyum sa\u011flayabilir) yaz\u0131l\u0131m geli\u015ftirmenin \u00f6n\u00fcn\u00fc a\u00e7ar.<\/p>\n<hr \/>\n<h3><strong>1. S &#8211; Single-Responsibility Principle (Tek Sorumluluk Prensibi)<\/strong><\/h3>\n<p class=\"ds-markdown-paragraph\"><strong>Tan\u0131m:<\/strong>\u00a0&#8220;Bir s\u0131n\u0131f\u0131n de\u011fi\u015fmesi i\u00e7in yaln\u0131zca bir sebebi olmal\u0131d\u0131r.&#8221; Ba\u015fka bir deyi\u015fle, bir s\u0131n\u0131f yaln\u0131zca bir i\u015fi yapmal\u0131 ve o i\u015fi \u00e7ok iyi yapmal\u0131d\u0131r.<\/p>\n<p class=\"ds-markdown-paragraph\"><strong>Sorun:<\/strong>\u00a0A\u015fa\u011f\u0131daki\u00a0<code>AreaCalculator<\/code>\u00a0s\u0131n\u0131f\u0131, hem \u015fekillerin alanlar\u0131n\u0131 toplama\u00a0<em>hem de<\/em>\u00a0bu sonucu HTML format\u0131nda \u00e7\u0131kt\u0131lama sorumlulu\u011funu \u00fcstlenmi\u015ftir. Bu, iki farkl\u0131 de\u011fi\u015fim sebebi do\u011furur: hesaplama mant\u0131\u011f\u0131 de\u011fi\u015febilir veya \u00e7\u0131kt\u0131 format\u0131 (JSON, XML vs. istenebilir) de\u011fi\u015febilir.<\/p>\n<pre class=\"lang:php decode:true \">\/\/ SRP'yi \u0130hlal Eden S\u0131n\u0131f\r\nclass AreaCalculator {\r\n    protected $shapes;\r\n\r\n    public function __construct($shapes = []) {\r\n        $this-&gt;shapes = $shapes;\r\n    }\r\n\r\n    public function sum() {\r\n        \/\/ ... Alanlar\u0131 hesapla ...\r\n    }\r\n\r\n    public function output() { \/\/ \u00c7\u0131kt\u0131 sorumlulu\u011fu burada -&gt; Problem!\r\n        return implode('', [\r\n            '',\r\n            'Sum of the areas of provided shapes: ',\r\n            $this-&gt;sum(),\r\n            '',\r\n        ]);\r\n    }\r\n}<\/pre>\n<p class=\"ds-markdown-paragraph\"><strong>\u00c7\u00f6z\u00fcm:<\/strong>\u00a0Sorumluluklar\u0131 ay\u0131r. Hesaplama ve \u00e7\u0131kt\u0131lama i\u015flemleri i\u00e7in iki ayr\u0131 s\u0131n\u0131f olu\u015ftur.<\/p>\n<div class=\"md-code-block md-code-block-dark\">\n<div class=\"md-code-block-banner-wrap\">\n<div class=\"md-code-block-banner md-code-block-banner-lite\">\n<div class=\"_121d384\">\n<pre class=\"lang:php decode:true \">\/\/ Sadece hesaplama sorumlulu\u011fu\r\nclass AreaCalculator {\r\n    protected $shapes;\r\n\r\n    public function __construct($shapes = []) {\r\n        $this-&gt;shapes = $shapes;\r\n    }\r\n\r\n    public function sum() {\r\n        foreach ($this-&gt;shapes as $shape) {\r\n            $area[] = $shape-&gt;area(); \/\/ Her \u015fekil kendi alan\u0131n\u0131 hesaplar\r\n        }\r\n        return array_sum($area);\r\n    }\r\n}\r\n\r\n\/\/ Sadece \u00e7\u0131kt\u0131lama sorumlulu\u011fu\r\nclass SumCalculatorOutputter {\r\n    protected $calculator;\r\n\r\n    public function __construct(AreaCalculator $calculator) {\r\n        $this-&gt;calculator = $calculator;\r\n    }\r\n\r\n    public function HTML() {\r\n        return implode('', [\r\n            '',\r\n            'Sum of the areas of provided shapes: ',\r\n            $this-&gt;calculator-&gt;sum(),\r\n            '',\r\n        ]);\r\n    }\r\n\r\n    public function JSON() {\r\n        return json_encode(['sum' =&gt; $this-&gt;calculator-&gt;sum()]);\r\n    }\r\n}\r\n\r\n\/\/ Kullan\u0131m\r\n$shapes = [new Circle(2), new Square(5)];\r\n$areaCalculator = new AreaCalculator($shapes);\r\n$outputter = new SumCalculatorOutputter($areaCalculator);\r\n\r\necho $outputter-&gt;HTML();\r\necho $outputter-&gt;JSON();<\/pre>\n<p class=\"ds-markdown-paragraph\"><strong>Faydas\u0131:<\/strong>\u00a0Kod daha d\u00fczenli hale gelir. Hesaplama mant\u0131\u011f\u0131 de\u011fi\u015firse yaln\u0131zca\u00a0<code>AreaCalculator<\/code>, \u00e7\u0131kt\u0131 format\u0131 de\u011fi\u015firse yaln\u0131zca\u00a0<code>SumCalculatorOutputter<\/code>\u00a0s\u0131n\u0131f\u0131 de\u011fi\u015ftirilir. De\u011fi\u015fimler izole edilmi\u015ftir.<\/p>\n<hr \/>\n<h3><strong>2. O &#8211; Open-Closed Principle (A\u00e7\u0131k\/Kapal\u0131 Prensibi)<\/strong><\/h3>\n<p class=\"ds-markdown-paragraph\"><strong>Tan\u0131m:<\/strong>\u00a0&#8220;Yaz\u0131l\u0131m varl\u0131klar\u0131 (s\u0131n\u0131flar, mod\u00fcller, fonksiyonlar vb.) geni\u015fletmeye\u00a0<strong>a\u00e7\u0131k<\/strong>, ancak de\u011fi\u015fikli\u011fe\u00a0<strong>kapal\u0131<\/strong>\u00a0olmal\u0131d\u0131r.&#8221; Mevcut, \u00e7al\u0131\u015fan kodu de\u011fi\u015ftirmeden yeni \u00f6zellikler ekleyebilmeliyiz.<\/p>\n<p class=\"ds-markdown-paragraph\"><strong>Sorun:<\/strong>\u00a0A\u015fa\u011f\u0131daki\u00a0<code>sum<\/code>\u00a0metoduna her yeni \u015fekil eklendi\u011finde (\u00fc\u00e7gen, be\u015fgen), mevcut koda\u00a0<code>elseif<\/code>\u00a0blo\u011fu eklemek\u00a0<em>zorunda kal\u0131r\u0131z<\/em>. Bu, prensibi ihlal eder \u00e7\u00fcnk\u00fc temel s\u0131n\u0131f\u0131\u00a0<strong>de\u011fi\u015ftirmi\u015f<\/strong>\u00a0oluruz.<\/p>\n<pre class=\"lang:php decode:true \">class AreaCalculator {\r\n    \/\/ ...\r\n    public function sum() {\r\n        $area = [];\r\n        foreach ($this-&gt;shapes as $shape) {\r\n            if (is_a($shape, 'Square')) {\r\n                $area[] = pow($shape-&gt;length, 2);\r\n            } elseif (is_a($shape, 'Circle')) { \/\/ Yeni bir \u015fekil? Yeni bir 'elseif'!\r\n                $area[] = pi() * pow($shape-&gt;radius, 2);\r\n            }\r\n            \/\/ Yeni bir \u015fekil i\u00e7in buray\u0131 DE\u011e\u0130\u015eT\u0130RMEK zorunday\u0131z.\r\n        }\r\n        return array_sum($area);\r\n    }\r\n}<\/pre>\n<p class=\"ds-markdown-paragraph\"><strong>\u00c7\u00f6z\u00fcm:<\/strong>\u00a0<strong>Soyutlamalara<\/strong>\u00a0(interface&#8217;ler veya abstract s\u0131n\u0131flar) ba\u011fl\u0131 \u00e7al\u0131\u015f. Yeni bir \u00f6zellik eklemek i\u00e7in mevcut kodu de\u011fi\u015ftirmek yerine, soyutlamay\u0131 uygulayan yeni bir s\u0131n\u0131f yarat\u0131r\u0131z.<\/p>\n<div class=\"md-code-block md-code-block-dark\">\n<div class=\"md-code-block-banner-wrap\">\n<div class=\"md-code-block-banner md-code-block-banner-lite\">\n<div class=\"_121d384\">\n<pre class=\"lang:php decode:true \">\/\/ Bir Soyutlama (Abstraction) - De\u011fi\u015fime kapal\u0131\r\ninterface ShapeInterface {\r\n    public function area();\r\n}\r\n\r\n\/\/ Somut Implementasyonlar - Geni\u015flemeye a\u00e7\u0131k\r\nclass Square implements ShapeInterface {\r\n    public function area() { return pow($this-&gt;length, 2); }\r\n}\r\n\r\nclass Circle implements ShapeInterface {\r\n    public function area() { return pi() * pow($this-&gt;radius, 2); }\r\n}\r\n\r\n\/\/ Yeni bir \u015fekil eklemek i\u00e7in mevcut koda DOKUNMAYIZ.\r\nclass Triangle implements ShapeInterface {\r\n    public function area() { \/* ...\u00dc\u00e7gen alan\u0131 hesab\u0131... *\/ }\r\n}\r\n\r\n\/\/ AreaCalculator s\u0131n\u0131f\u0131 art\u0131k de\u011fi\u015fime kapal\u0131d\u0131r.\r\nclass AreaCalculator {\r\n    \/\/ ...\r\n    public function sum() {\r\n        foreach ($this-&gt;shapes as $shape) {\r\n            if ($shape instanceof ShapeInterface) {\r\n                $area[] = $shape-&gt;area(); \/\/ Nas\u0131l hesapland\u0131\u011f\u0131n\u0131 bilmez, sadece 'area' metodunu \u00e7a\u011f\u0131r\u0131r.\r\n                continue;\r\n            }\r\n            throw new Exception(\"Ge\u00e7ersiz \u015fekil\");\r\n        }\r\n        return array_sum($area);\r\n    }\r\n}<\/pre>\n<p class=\"ds-markdown-paragraph\"><strong>Faydas\u0131:<\/strong>\u00a0Sistem, mevcut kodu bozma riski olmadan ve minimum \u00e7abayla yeni \u00f6zelliklerle geni\u015fletilebilir.<\/p>\n<hr \/>\n<h3><strong>3. L &#8211; Liskov Substitution Principle (Liskov&#8217;un Yerine Ge\u00e7me Prensibi)<\/strong><\/h3>\n<p class=\"ds-markdown-paragraph\"><strong>Tan\u0131m:<\/strong>\u00a0&#8220;Bir programdaki nesneler, kendi alt t\u00fcrlerinin \u00f6rnekleriyle de\u011fi\u015ftirilebilmelidir ve bu de\u011fi\u015fim program\u0131n do\u011frulu\u011funu bozmamal\u0131d\u0131r.&#8221; Kal\u0131t\u0131m alan bir s\u0131n\u0131f, temel s\u0131n\u0131f\u0131n t\u00fcm davran\u0131\u015flar\u0131n\u0131 korumal\u0131 ve beklenmeyen s\u00fcrprizler yapmamal\u0131d\u0131r.<\/p>\n<p class=\"ds-markdown-paragraph\"><strong>Sorun:<\/strong>\u00a0<code>AreaCalculator<\/code>&#8216;dan kal\u0131t\u0131m alan\u00a0<code>VolumeCalculator<\/code>\u00a0s\u0131n\u0131f\u0131,\u00a0<code>sum<\/code>\u00a0metodunun d\u00f6n\u00fc\u015f tipini (integer\/float yerine dizi) de\u011fi\u015ftiriyor. Bu, temel s\u0131n\u0131f\u0131n kullan\u0131ld\u0131\u011f\u0131 her yerde (<code>SumCalculatorOutputter<\/code>) onun yerine kullan\u0131lamayaca\u011f\u0131 anlam\u0131na gelir ve hataya sebep olur.<\/p>\n<pre class=\"lang:php decode:true \">class VolumeCalculator extends AreaCalculator {\r\n    public function sum() {\r\n        \/\/ Hacimleri hesapla...\r\n        return [$summedData]; \/\/ Beklenen bir say\u0131 yerine dizi d\u00f6nd\u00fcr\u00fcr -&gt; Problem!\r\n    }\r\n}\r\n\r\n$volumes = new VolumeCalculator($solidShapes);\r\n$output = new SumCalculatorOutputter($volumes);\r\necho $output-&gt;HTML(); \/\/ HATA: Diziyi string gibi yazd\u0131rmaya \u00e7al\u0131\u015f\u0131r.<\/pre>\n<p class=\"ds-markdown-paragraph\"><strong>\u00c7\u00f6z\u00fcm:<\/strong>\u00a0Alt s\u0131n\u0131flar, \u00fcst s\u0131n\u0131flar\u0131n davran\u0131\u015flar\u0131n\u0131 ve imzalar\u0131n\u0131 (d\u00f6n\u00fc\u015f tipleri gibi) bozmamal\u0131d\u0131r. \u00dcst s\u0131n\u0131f\u0131n s\u00f6zle\u015fmesine sad\u0131k kalmal\u0131d\u0131rlar.<\/p>\n<div class=\"md-code-block md-code-block-dark\">\n<div class=\"md-code-block-banner-wrap\">\n<div class=\"md-code-block-banner md-code-block-banner-lite\">\n<div class=\"_121d384\">\n<pre class=\"lang:php decode:true \">class VolumeCalculator extends AreaCalculator {\r\n    public function sum() {\r\n        \/\/ Hacimleri hesapla...\r\n        return $summedData; \/\/ \u00dcst s\u0131n\u0131f gibi bir say\u0131 (int\/float) d\u00f6nd\u00fcr\u00fcr.\r\n    }\r\n}<\/pre>\n<p class=\"ds-markdown-paragraph\"><strong>Faydas\u0131:<\/strong>\u00a0Kod i\u00e7g\u00fcd\u00fcsel olarak do\u011fru \u00e7al\u0131\u015f\u0131r. \u00dcst s\u0131n\u0131f referans\u0131 tutan bir nesneye alt s\u0131n\u0131f atad\u0131\u011f\u0131n\u0131zda nas\u0131l davranaca\u011f\u0131ndan emin olabilirsiniz. Bu, polimorfizmin g\u00fcvenli bir \u015fekilde kullan\u0131lmas\u0131n\u0131 sa\u011flar.<\/p>\n<hr \/>\n<h3><strong>4. I &#8211; Interface Segregation Principle (Aray\u00fcz Ayr\u0131\u015ft\u0131rma Prensibi)<\/strong><\/h3>\n<p class=\"ds-markdown-paragraph\"><strong>Tan\u0131m:<\/strong>\u00a0&#8220;Hi\u00e7bir istemci, kullanmad\u0131\u011f\u0131 metodlara ba\u011f\u0131ml\u0131 olmaya zorlanmamal\u0131d\u0131r.&#8221; B\u00fcy\u00fck, monolitik aray\u00fczler yerine, istemciye \u00f6zel, k\u00fc\u00e7\u00fck ve odaklanm\u0131\u015f aray\u00fczler tercih edilmelidir.<\/p>\n<p class=\"ds-markdown-paragraph\"><strong>Sorun:<\/strong>\u00a0T\u00fcm \u015fekilleri tek bir\u00a0<code>ShapeInterface<\/code>\u00a0i\u00e7inde toplamak,\u00a0<code>Square<\/code>\u00a0gibi 2B \u015fekilleri, ihtiya\u00e7 duymad\u0131klar\u0131\u00a0<code>volume<\/code>\u00a0metodunu implemente etmeye zorlar.<\/p>\n<pre class=\"lang:php decode:true \">\/\/ Monolitik, \"\u015fi\u015fman\" aray\u00fcz -&gt; Problem!\r\ninterface ShapeInterface {\r\n    public function area();\r\n    public function volume(); \/\/ 2B \u015fekillerin bunu implemente etmesi anlams\u0131zd\u0131r.\r\n}\r\n\r\nclass Square implements ShapeInterface {\r\n    public function area() { \/* ... *\/ }\r\n    public function volume() { \/* ... *\/ } \/\/ Bo\u015f bir metod? Veya istisna f\u0131rlatmak? -&gt; K\u00f6t\u00fc tasar\u0131m.\r\n}<\/pre>\n<p class=\"ds-markdown-paragraph\"><strong>\u00c7\u00f6z\u00fcm:<\/strong>\u00a0Aray\u00fczleri, belirli istemci ihtiya\u00e7lar\u0131na g\u00f6re daha k\u00fc\u00e7\u00fck par\u00e7alara b\u00f6l.<\/p>\n<div class=\"md-code-block md-code-block-dark\">\n<div class=\"md-code-block-banner-wrap\">\n<div class=\"_121d384\">\n<pre class=\"lang:php decode:true \">\/\/ Ayr\u0131\u015ft\u0131r\u0131lm\u0131\u015f, spesifik aray\u00fczler\r\ninterface TwoDimensionalShapeInterface {\r\n    public function area();\r\n}\r\n\r\ninterface ThreeDimensionalShapeInterface {\r\n    public function volume();\r\n}\r\n\r\n\/\/ \u0130stemci s\u0131n\u0131flar sadece ihtiya\u00e7 duyduklar\u0131 aray\u00fcz\u00fc implemente eder.\r\nclass Square implements TwoDimensionalShapeInterface {\r\n    public function area() { \/* ... *\/ } \/\/ Sadece alan, sorumluluk net.\r\n}\r\n\r\nclass Cuboid implements TwoDimensionalShapeInterface, ThreeDimensionalShapeInterface {\r\n    public function area() { \/* Y\u00fczey alan\u0131 *\/ } \/\/ \u0130kisini de kullan\u0131r.\r\n    public function volume() { \/* Hacim *\/ }\r\n}<\/pre>\n<p class=\"ds-markdown-paragraph\"><strong>Faydas\u0131:<\/strong>\u00a0Sistem daha az &#8220;ba\u011f\u0131ml\u0131l\u0131k y\u00fck\u00fc&#8221; ta\u015f\u0131r. S\u0131n\u0131flar daha az metoda sahip, daha basit aray\u00fczlerle \u00e7al\u0131\u015f\u0131r, bu da kodun anla\u015f\u0131l\u0131rl\u0131\u011f\u0131n\u0131 ve s\u00fcrd\u00fcr\u00fclebilirli\u011fini art\u0131r\u0131r.<\/p>\n<hr \/>\n<h3><strong>5. D &#8211; Dependency Inversion Principle (Ba\u011f\u0131ml\u0131l\u0131klar\u0131n Tersine \u00c7evrilmesi Prensibi)<\/strong><\/h3>\n<p class=\"ds-markdown-paragraph\"><strong>Tan\u0131m:<\/strong>\u00a0&#8220;\u00dcst seviye mod\u00fcller, alt seviye mod\u00fcllere ba\u011fl\u0131 olmamal\u0131d\u0131r. Her ikisi de soyutlamalara ba\u011fl\u0131 olmal\u0131d\u0131r. Soyutlamalar ayr\u0131nt\u0131lara ba\u011fl\u0131 olmamal\u0131, ayr\u0131nt\u0131lar soyutlamalara ba\u011fl\u0131 olmal\u0131d\u0131r.&#8221;<\/p>\n<p class=\"ds-markdown-paragraph\"><strong>Sorun:<\/strong>\u00a0\u00dcst seviye bir mod\u00fcl olan\u00a0<code>PasswordReminder<\/code>, alt seviye bir mod\u00fcl olan\u00a0<code>MySQLConnection<\/code>\u00a0s\u0131n\u0131f\u0131na do\u011frudan ve somut bir \u015fekilde ba\u011f\u0131ml\u0131d\u0131r. Veritaban\u0131 de\u011fi\u015fti\u011finde (PostgreSQL&#8217;e ge\u00e7i\u015f), \u00fcst seviye mod\u00fcl\u00fc de\u011fi\u015ftirmek zorunda kal\u0131r\u0131z.<\/p>\n<pre class=\"lang:php decode:true \">class MySQLConnection { \/\/ Alt seviye mod\u00fcl (Detay)\r\n    public function connect() { \/* ... *\/ }\r\n}\r\n\r\nclass PasswordReminder { \/\/ \u00dcst seviye mod\u00fcl (\u0130\u015f mant\u0131\u011f\u0131)\r\n    private $dbConnection;\r\n\r\n    public function __construct(MySQLConnection $dbConnection) { \/\/ Somut s\u0131n\u0131fa ba\u011f\u0131ml\u0131 -&gt; Problem!\r\n        $this-&gt;dbConnection = $dbConnection; \/\/ PostgreSQL'e ge\u00e7emeyiz.\r\n    }\r\n}<\/pre>\n<p class=\"ds-markdown-paragraph\"><strong>\u00c7\u00f6z\u00fcm:<\/strong>\u00a0\u00dcst seviye mod\u00fcl, bir soyutlama (aray\u00fcz) arac\u0131l\u0131\u011f\u0131yla \u00e7al\u0131\u015fmal\u0131d\u0131r. Alt seviye mod\u00fcl ise bu soyutlamay\u0131 implemente etmelidir. B\u00f6ylece ba\u011f\u0131ml\u0131l\u0131k y\u00f6n\u00fc &#8220;tersine \u00e7evrilmi\u015f&#8221; olur.<\/p>\n<div class=\"md-code-block md-code-block-dark\">\n<div class=\"md-code-block-banner-wrap\">\n<div class=\"md-code-block-banner md-code-block-banner-lite\">\n<div class=\"_121d384\">\n<pre class=\"lang:php decode:true \">\/\/ Soyutlama\r\ninterface DBConnectionInterface {\r\n    public function connect();\r\n}\r\n\r\n\/\/ Alt seviye mod\u00fcl soyutlamaya ba\u011fl\u0131 (Detay -&gt; Soyutlama)\r\nclass MySQLConnection implements DBConnectionInterface {\r\n    public function connect() { return \"MySQL ba\u011flant\u0131s\u0131\"; }\r\n}\r\nclass PostgreSQLConnection implements DBConnectionInterface {\r\n    public function connect() { return \"PostgreSQL ba\u011flant\u0131s\u0131\"; }\r\n}\r\n\r\n\/\/ \u00dcst seviye mod\u00fcl soyutlamaya ba\u011fl\u0131 (\u0130\u015f Mant\u0131\u011f\u0131 -&gt; Soyutlama)\r\nclass PasswordReminder {\r\n    private $dbConnection;\r\n\r\n    public function __construct(DBConnectionInterface $dbConnection) { \/\/ Art\u0131k somut s\u0131n\u0131f de\u011fil, aray\u00fcz!\r\n        $this-&gt;dbConnection = $dbConnection; \/\/ MySQL, PostgreSQL, MongoDB... Hepsi uyar.\r\n    }\r\n}\r\n\r\n\/\/ Kullan\u0131m - Ba\u011f\u0131ml\u0131l\u0131k \"D\u0131\u015far\u0131dan Enjekte Ediliyor\" (Dependency Injection)\r\n$mysql = new MySQLConnection();\r\n$reminder = new PasswordReminder($mysql); \/\/ MySQL ile\r\n\r\n$postgresql = new PostgreSQLConnection();\r\n$reminder = new PasswordReminder($postgresql); \/\/ PostgreSQL ile -&gt; PasswordReminder'da DE\u011e\u0130\u015e\u0130KL\u0130K GEREKMEZ!<\/pre>\n<p class=\"ds-markdown-paragraph\"><strong>Faydas\u0131:<\/strong>\u00a0Mod\u00fcller aras\u0131\u00a0<strong>gev\u015fek ba\u011fl\u0131l\u0131k (loose coupling)<\/strong>\u00a0sa\u011flan\u0131r. Sistem \u00e7ok daha esnek ve test edilebilir hale gelir. \u00dcnite testlerde ger\u00e7ek bir veritaban\u0131 yerine\u00a0<code>DBConnectionInterface<\/code>&#8216;i implemente eden bir\u00a0<strong>sahte (mock)<\/strong>\u00a0nesne kullan\u0131labilir.<\/p>\n<hr \/>\n<h3><strong>Sonu\u00e7<\/strong><\/h3>\n<p class=\"ds-markdown-paragraph\">SOLID prensipleri, karma\u015f\u0131k yaz\u0131l\u0131m sistemlerini y\u00f6netilebilir par\u00e7alara ay\u0131rman\u0131n ve nesne y\u00f6nelimli tasar\u0131m\u0131n kalitesini art\u0131rman\u0131n sistematik bir yoludur. Bu prensipler birer &#8220;kural&#8221;dan ziyade, deneyimle olgunla\u015fan bir &#8220;d\u00fc\u015f\u00fcnce tarz\u0131d\u0131r&#8221;. \u0130lk ba\u015fta uygulamak zor gelse de, zamanla kodunuzda ne zaman bir koku hissetti\u011finizi ve hangi prensibi uygulayarak bu kokuyu giderebilece\u011finizi i\u00e7selle\u015ftirirsiniz.<\/p>\n<p data-start=\"4552\" data-end=\"4768\"><strong data-start=\"4552\" data-end=\"4573\">SOLID prensipleri<\/strong>, yaz\u0131l\u0131m geli\u015ftiricilere yaln\u0131zca teorik bir yol haritas\u0131 sunmakla kalmaz, ayn\u0131 zamanda g\u00fcnl\u00fck hayatta kullan\u0131lan projelerde <strong data-start=\"4699\" data-end=\"4733\">temiz, esnek ve s\u00fcrd\u00fcr\u00fclebilir<\/strong> kod yazman\u0131n temelini olu\u015fturur.<\/p>\n<p data-start=\"4770\" data-end=\"4796\">Bu prensipler sayesinde:<\/p>\n<ul data-start=\"4797\" data-end=\"4988\">\n<li data-start=\"4797\" data-end=\"4827\">\n<p data-start=\"4799\" data-end=\"4827\">Kodunuz daha kolay okunur,<\/p>\n<\/li>\n<li data-start=\"4828\" data-end=\"4889\">\n<p data-start=\"4830\" data-end=\"4889\">Yeni \u00f6zellik eklemek mevcut sistemi bozmadan yap\u0131labilir,<\/p>\n<\/li>\n<li data-start=\"4890\" data-end=\"4938\">\n<p data-start=\"4892\" data-end=\"4938\">Test edilebilirlik ve bak\u0131m maliyeti azal\u0131r,<\/p>\n<\/li>\n<li data-start=\"4939\" data-end=\"4988\">\n<p data-start=\"4941\" data-end=\"4988\">Uzun vadeli projelerde kodun ya\u015fam \u00f6mr\u00fc uzar.<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"4990\" data-end=\"5159\">K\u0131sacas\u0131, <strong data-start=\"5000\" data-end=\"5021\">SOLID prensipleri<\/strong> yaz\u0131l\u0131m m\u00fchendisli\u011finin alt\u0131n kurallar\u0131d\u0131r. Onlar\u0131 \u00f6\u011frenmek, uygulamak ve i\u00e7selle\u015ftirmek, yaz\u0131l\u0131m geli\u015ftiriciyi bir \u00fcst seviyeye ta\u015f\u0131r.<\/p>\n<p class=\"ds-markdown-paragraph\">Unutmay\u0131n, ama\u00e7 kat\u0131 bir \u015fekilde kurallara uymak de\u011fil, daha\u00a0<strong>temiz, anla\u015f\u0131l\u0131r ve dayan\u0131kl\u0131<\/strong>\u00a0yaz\u0131l\u0131mlar \u00fcretebilmektir. SOLID, bu uzun ve keyifli yolculukta size rehberlik edecek en g\u00fcvenilir arkada\u015flar\u0131n\u0131zdan biri olacakt\u0131r.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"Yaz\u0131l\u0131m d\u00fcnyas\u0131nda, projeler b\u00fcy\u00fcd\u00fck\u00e7e kod tabanlar\u0131n\u0131n karma\u015f\u0131kl\u0131\u011f\u0131 da artar. Bu karma\u015f\u0131kl\u0131kla ba\u015f etmenin, kodunuzu esnek, anla\u015f\u0131l\u0131r, s\u00fcrd\u00fcr\u00fclebilir ve&hellip;","protected":false},"author":1,"featured_media":27908,"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":[1],"tags":[1363],"class_list":{"0":"post-27906","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-genel","8":"tag-solid-prensipleri","9":"cs-entry","10":"cs-video-wrap"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.5 (Yoast SEO v25.3.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Yaz\u0131l\u0131m Geli\u015ftirmede SOLID Prensipleri: Sa\u011flam ve Esnek Kodlama \u0130\u00e7in Rehber - Kodlar\u0131n Gizemli D\u00fcnyas\u0131<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/fatihsoysal.com\/blog\/yazilim-gelistirmede-solid-prensipleri-saglam-ve-esnek-kodlama-icin-rehber\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Yaz\u0131l\u0131m Geli\u015ftirmede SOLID Prensipleri: Sa\u011flam ve Esnek Kodlama \u0130\u00e7in Rehber\" \/>\n<meta property=\"og:description\" content=\"Yaz\u0131l\u0131m d\u00fcnyas\u0131nda, projeler b\u00fcy\u00fcd\u00fck\u00e7e kod tabanlar\u0131n\u0131n karma\u015f\u0131kl\u0131\u011f\u0131 da artar. 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