Merhaba arkada\u015flar,<\/p>\n
Uzun zamand\u0131r makale yazamad\u0131\u011f\u0131m\u0131 farkettim ve projelerimizde kullan\u0131m kolayl\u0131\u011f\u0131 sa\u011flayacak bir konu ile aray\u0131 peki\u015ftirmek istedim. :)<\/p>\n
\u00d6ncelikle nedir bu IoC Container<\/strong>?<\/p>\n A\u00e7\u0131l\u0131m\u0131n\u0131\u00a0Inversion\u00a0of Control’<\/strong>den alan IoC Container, uygulaman\u0131n ak\u0131\u015f\u0131 s\u0131ras\u0131nda bize yarat\u0131lmas\u0131 gereken do\u011fru tipi yaratarak, uygulaman\u0131n ak\u0131\u015f\u0131n\u0131 do\u011fru bir \u015fekilde ilerleten \u00f6zel s\u0131n\u0131flard\u0131r.<\/p><\/blockquote>\n K\u0131saca Dependency Injection<\/strong> ve Dependency Inversion<\/strong>‘dan bahsetmek gerekirse:<\/p>\n Dependency Injection<\/strong> prensibi, uygulama i\u00e7erisindeki bile\u015fenlerin birbirleri ile s\u0131k\u0131 s\u0131k\u0131ya ba\u011fl\u0131(tightly coupled<\/strong>) olmamas\u0131 yani gev\u015fek ba\u011fl\u0131(loosely coupled<\/strong>) olmas\u0131d\u0131r diyebiliriz.<\/p>\n Dependency Injection ile uygulaman\u0131n\u00a0\u00e7al\u0131\u015faca\u011f\u0131 bile\u015fenleri d\u0131\u015far\u0131dan enjekte\u00a0ederek, ileride olu\u015fabilecek herhangi bir de\u011fi\u015fiklikten minimum seviyede etkinlenmesini sa\u011flam\u0131\u015f oluruz.<\/p>\n ——–<\/p>\n Dependency Inversion<\/strong> ise, “ba\u011f\u0131ml\u0131l\u0131klar\u0131n tersine \u00e7evrilmesi” anlam\u0131na gelmektedir. Yani somut s\u0131n\u0131flara olan ba\u011f\u0131ml\u0131l\u0131klar\u0131, soyutlayarak\u00a0ortadan kald\u0131r\u0131lmas\u0131d\u0131r.<\/p>\n Somut s\u0131n\u0131flar\u0131m\u0131z s\u0131k s\u0131k de\u011fi\u015fikli\u011fe u\u011frayabilecekleri i\u00e7in buna ba\u011f\u0131ml\u0131 olan di\u011fer s\u0131n\u0131flar\u0131m\u0131zda\u00a0etkilenecektir.<\/p><\/blockquote>\n Hemen \u00f6rnek kodumuz ile basit bir IoC Container yapal\u0131m ve bir Loglama sistemi geli\u015ftirelim.<\/p>\n GokFramework.IoCContainer\u00a0<\/strong>isminde bir yeni proje ekleyip i\u00e7ine\u00a0IoCResolver.cs<\/strong> isminde bir class olu\u015fturuyorum.<\/p>\n Class’\u0131m\u0131za bakt\u0131\u011f\u0131m\u0131zda, \u00f6ncelikle\u00a0constructor<\/strong>‘\u0131m\u0131zda Singleton<\/strong> Patternini uygulad\u0131\u011f\u0131m\u0131z\u0131 g\u00f6r\u00fcyoruz tekilli\u011fini sa\u011flamak i\u00e7in.<\/p>\n Resolve<\/strong> isminde bir method olu\u015fturarak iki tip al\u0131yoruz\u00a0TSource<\/strong> ve\u00a0TDestination<\/strong> olarak.\u00a0TSource<\/strong> burada enjekte\u00a0yap\u0131lacak class’\u0131m\u0131z\u0131 temsil ederken,\u00a0TDestination<\/strong> ise enjekte edilecek\u00a0concrete class’\u0131m\u0131z\u0131\u00a0temsil ediyor.<\/p>\n Runtime’da instancelerini alarak,\u00a0dependencyForInstance<\/strong> objemizin yani\u00a0TSource<\/strong>‘umuzun field’lar\u0131nda (Birazdan loglama geli\u015ftirme k\u0131sm\u0131nda inceleyece\u011fimiz Loglama context’imizdeki ILogger<\/strong> property’mizin private static<\/strong> oldu\u011fu i\u00e7in field’lar\u0131n\u0131 al\u0131yoruz) dolanarak enjekte\u00a0yap\u0131lacak\u00a0class’\u0131m\u0131z\u0131n (TSource) i\u00e7indeki, d\u0131\u015far\u0131dan enjekte\u00a0edilecek\u00a0class tipini\u00a0bularak, varsa:<\/p>\n SetValue methodu ile\u00a0TSource’umuza<\/strong>,\u00a0d\u0131\u015far\u0131dan enjekte\u00a0edilecek\u00a0s\u0131n\u0131f\u0131n instance’sini<\/strong> set ediyoruz. Loglama context’imizdeki ILogger<\/strong> property’mizi static olarak tan\u0131mlad\u0131\u011f\u0131m\u0131z i\u00e7in, instance’si\u00a0ram bellekte saklanacakt\u0131r ve\u00a0dolay\u0131s\u0131yla\u00a0uygulamam\u0131z\u0131n \u00e7al\u0131\u015fmas\u0131 boyunca loglama sistemimizi kullanabiliriz. Tekrardan d\u0131\u015far\u0131dan bir tipi enjekte\u00a0etme ihtiyac\u0131 duymay\u0131z.\u00a0B\u00f6ylelikle hem\u00a0kod tekrar\u0131ndan kurtulmu\u015f olduk, hemde generic bir \u015fekilde tekrar kullan\u0131labilirli\u011fini artt\u0131rd\u0131k.<\/p>\n IoC Container<\/strong> tasar\u0131m\u0131m\u0131z i\u015fte bu kadar. :) Art\u0131k istedi\u011fimiz zaman uygulamam\u0131z\u0131n Application_Start’\u0131nda veya Main’inde bir kere enjekte\u00a0etmemiz yetecektir.<\/p>\n <\/p>\n Hemen basit bir Loglama sistemimizi tasarlayal\u0131m:<\/p>\n GokFramework.Logger\u00a0<\/strong>isminde yeni bir proje daha ekleyerek, Log sistemimizi soyutlamak i\u00e7in\u00a0ILogger<\/strong> isminde bir interface ekliyorum.<\/p>\n MethodBase’i isteyerek hangi class’dan\u00a0ve method’dan \u00e7a\u011fr\u0131ld\u0131\u011f\u0131n\u0131 yakalayabilece\u011fiz\u00a0loglama s\u0131ras\u0131nda ve log tutulacak\u00a0mesaj\u0131m\u0131z.<\/p>\n <\/p>\n FileLogger<\/strong> isminde bir yeni class ekleyerek ILogger<\/strong> interface’mizi implemente ediyoruz. FileLogger burada concrete<\/strong> class’\u0131m\u0131z oluyor.<\/p>\n Basit olarak bir log tutma methodu yaz\u0131yorum, tarihe g\u00f6re bir txt dosyas\u0131 olu\u015fturarak, hangi namespace’den<\/strong> ve method’dan<\/strong> \u00e7a\u011f\u0131r\u0131ld\u0131\u011f\u0131 gibi i\u00e7eri\u011fi tutaca\u011f\u0131z.<\/p>\n Log tutulacak path’imizi App.Config<\/strong> dosyas\u0131ndan “GokFramework.LoggerPath” key’i ile okuyorum.<\/p>\n <\/p>\n Hemen ard\u0131ndan\u00a0LoggerContext<\/strong> isminde bir class daha ekleyerek kodlamaya ge\u00e7iyorum.<\/p>\n Log sistemimizi LoggerContext ile sarmalayarak, Logger<\/strong> isminde ve ILogger<\/strong> tipinde bir static property tan\u0131ml\u0131yoruz. B\u00f6ylelikle LoggerContext’imizin ILogger tipinden gelecek olan Loglama concrete<\/strong> class’\u0131m\u0131z ile s\u0131k\u0131 ba\u011fl\u0131l\u0131\u011f\u0131n\u0131 engellemi\u015f\u00a0oluyoruz.<\/p>\n \u0130leride gelecek olan FileLogger haricinde yeni geli\u015ftirmelerin \u00f6rne\u011fin, MailLogger, SmsLogger gibi concrete<\/strong> class’lar\u0131m\u0131z\u0131da kolayl\u0131kla sistemimize dahil edebilmemizi sa\u011flam\u0131\u015f olacak. Asl\u0131nda burada Strategy patterni<\/strong> uygulam\u0131\u015f olduk.<\/p>\n Bir log tutma i\u015fimiz var ve bunu tutabilmek i\u00e7in birden fazla algoritmam\u0131z var.<\/p>\n <\/p>\n Hemen kullan\u0131mlar\u0131na ge\u00e7elim.<\/p>\n \u00d6rnek bir console uygulamas\u0131 olu\u015fturarak Program.cs’in i\u00e7erisinde kodlamaya ba\u015fl\u0131yorum.<\/p>\n Kullan\u0131m\u0131 bu kadar basit.<\/p>\n Uygulamam\u0131zda hangi tipte log tutmak istiyorsak sadece bir kere Resolve etmemiz yeterli. Burada LoggerContext<\/strong> yani i\u00e7erisinde ILogger’imizi<\/strong> bar\u0131nd\u0131ran class’\u0131m\u0131z yani TSource\u00a0<\/strong>oluyor, enjecte yap\u0131lacak class’\u0131m\u0131z.<\/p>\n FileLogger<\/strong> ise d\u0131\u015far\u0131dan ILogger’a<\/strong> enjekte edilecek concrete class’\u0131m\u0131z yani TDestination<\/strong>. Bu MailLogger’da olabilir, SmsLogger’da.<\/p>\n <\/p>\n Umar\u0131m yararl\u0131 bir konu olmu\u015ftur. \u00d6rnek kodlar ektedir. :)<\/p>\nusing System;\r\nusing System.Linq;\r\nusing System.Collections.Generic;\r\nusing System.Reflection;\r\n\r\nnamespace GokFramework.IoCContainer\r\n{\r\n public class IoCResolver\r\n {\r\n #region Constructor\r\n private static object objLock = new object();\r\n private static IoCResolver m_IoCResolver;\r\n public static IoCResolver getInstance\r\n {\r\n get\r\n {\r\n if (m_IoCResolver == null)\r\n {\r\n lock (objLock)\r\n {\r\n if (m_IoCResolver == null)\r\n m_IoCResolver = new IoCResolver();\r\n }\r\n }\r\n\r\n return m_IoCResolver;\r\n }\r\n set { m_IoCResolver = value; }\r\n }\r\n\r\n #endregion\r\n\r\n \/\/\/ <summary>\r\n \/\/\/ Injection of control\r\n \/\/\/ <\/summary>\r\n \/\/\/ <typeparam name=\"TSource\">Injection yap\u0131lacak class type.<\/typeparam>\r\n \/\/\/ <typeparam name=\"TDestination\">Injection edilecek class type.<\/typeparam>\r\n \/\/\/ <returns><\/returns>\r\n public void Resolve<TSource, TDestination>()\r\n {\r\n object dependencyForInstance, implementedByInstance;\r\n dependencyForInstance = Activator.CreateInstance(typeof(TSource));\r\n implementedByInstance = Activator.CreateInstance(typeof(TDestination));\r\n\r\n foreach (var pi in dependencyForInstance.GetType().GetFields(BindingFlags.NonPublic | BindingFlags.Static))\r\n {\r\n var piList = implementedByInstance.GetType().GetInterfaces().Where(x => x.Name.Equals(pi.FieldType.Name)).ToList();\r\n if (piList.Count > 0)\r\n { pi.SetValue(dependencyForInstance, implementedByInstance); break; }\r\n }\r\n }\r\n }\r\n}<\/pre>\nimplementedByInstance.GetType().GetInterfaces().Where(x => x.Name.Equals(pi.FieldType.Name))<\/pre>\n
using System.Reflection;\r\n\r\nnamespace GokFramework.Logger\r\n{\r\n public interface ILogger\r\n {\r\n void Log(MethodBase methodBase, string message);\r\n }\r\n}\r\n<\/pre>\nusing System;\r\nusing System.Configuration;\r\nusing System.IO;\r\nusing System.Reflection;\r\n\r\nnamespace GokFramework.Logger\r\n{\r\n public class FileLogger : ILogger\r\n {\r\n public void Log(MethodBase methodBase, string message)\r\n {\r\n string logPath = ConfigurationManager.AppSettings[\"GokFramework.LoggerPath\"].TrimEnd('\/');\r\n string logName = DateTime.Now.ToString(\"yyyyMMdd_HHmm\") + \".txt\";\r\n string logMessage = string.Format(\"Namaspace: {0}\\r\\nClass: {1}\\r\\nMethod: {2}\\r\\nMessage: {3}\",\r\nmethodBase.ReflectedType.Namespace, methodBase.ReflectedType.Name, methodBase.Name, message);\r\n string path = System.IO.Path.Combine(logPath, logName);\r\n\r\n if (!Directory.Exists((logPath)))\r\n Directory.CreateDirectory(logPath);\r\n\r\n StreamWriter sw = new StreamWriter(path, true);\r\n sw.WriteLine(logMessage);\r\n sw.Close();\r\n sw.Dispose();\r\n }\r\n }\r\n}<\/pre>\nusing System.Reflection;\r\n\r\nnamespace GokFramework.Logger\r\n{\r\n public class LoggerContext\r\n {\r\n #region Properties\r\n private static ILogger Logger { get; set; }\r\n #endregion\r\n\r\n public static void Log(MethodBase methodBase, string message)\r\n {\r\n Logger.Log(methodBase, message);\r\n }\r\n }\r\n}<\/pre>\nusing GokFramework.IoCContainer;\r\nusing GokFramework.Logger;\r\nusing System.Reflection;\r\n\r\nnamespace GokFramework.ConsoleForTest\r\n{\r\n class Program\r\n {\r\n static void Main(string[] args)\r\n { \r\n #region Logger Test\r\n \/\/ Application_Start'da bir kere \u00e7al\u0131\u015ft\u0131r\u0131lacak, injection i\u00e7in.\r\n IoCResolver.getInstance.Resolve<LoggerContext, FileLogger>();\r\n\r\n \/\/ T\u00fcm projede injection yap\u0131lan tipte \u00e7al\u0131\u015facakt\u0131r.\r\n LoggerContext.Log(MethodBase.GetCurrentMethod(), \"blabla\");\r\n #endregion\r\n }\r\n }\r\n}\r\n<\/pre>\n