\n\u0130\u015fte bu tarz durumlar\u0131n \u00f6n\u00fcne ge\u00e7memizi sa\u011flayan etmenlerden birisidir plug-in tabanl\u0131 uygulama geli\u015ftirme.\u00a0Bu yoldaki en b\u00fcy\u00fck dostumuz Reflection<\/strong> namespace’idir.<\/p>\n
K\u0131saca Reflection’dan bahsetmek gerekirse nesneler ile ilgili \u00e7al\u0131\u015fma zaman\u0131nda nesneye ait property ve metotlara eri\u015febilmemizi ve metotlar\u0131 \u00e7a\u011f\u0131rabilmemizi sa\u011flar.<\/p>\n
\u015eimdi konumuza Hesap Makinesi \u00f6rne\u011fimizle devam edelim.<\/h4>\n
Projemiz k\u0131saca: \u0130\u015flem fonksiyonlar\u0131 plug-in olarak tasarlanacak bir hesap makinesi olacakt\u0131r.<\/p>\n
\u00d6ncelikle projemiz 3 par\u00e7adan olu\u015facakt\u0131r.<\/p>\n
- \n
- Contracts<\/strong> (Hesap makinemize plug-in geli\u015ftirirken Application Domain’ler aras\u0131 plug-in komutlar\u0131m\u0131z i\u00e7in ana interface tan\u0131mlamam\u0131z)<\/li>\n
- MainAppicationDomain<\/strong> (Hesap makinesi uygulamam\u0131z ve Plug-in’leri \u00e7al\u0131\u015ft\u0131racak olan proje yer alacak)<\/li>\n
- PlugInApplicationDomain<\/strong> (Eklenmi\u015f olan plug-in’leri taray\u0131p kendi ApplicationDomainin’de instance’lar\u0131n\u0131 t\u00fcretip MainApplicationDomain’imize g\u00f6nderecek olan PlugInEngine projemiz yer alacak)<\/li>\n<\/ul>\n
\u00d6ncelikle Contract’\u0131m\u0131z i\u00e7in Contracts<\/strong> isminde yeni bir klas\u00f6r ekleyip i\u00e7erisine\u00a0GG.PlugInTabanliHesapMakinesi.Contracts <\/strong>isimli bir ClassLibrary projesi ekliyorum.\u00a0\u0130\u00e7erisine\u00a0ICalculationCommand<\/strong> isimli bir interface tan\u0131ml\u0131yorum.<\/p>\n
namespace GG.PlugInTabanliHesapMakinesi.Contracts\r\n{\r\n \/\/\/ <summary>\r\n \/\/\/ Hesap makinemiz i\u00e7in plug-in tabanl\u0131 olarak geli\u015ftirece\u011fimiz hesaplama fonksiyonlar\u0131m\u0131z i\u00e7in ApplicationDomain'ler aras\u0131 contract'\u0131m\u0131z.\r\n \/\/\/ <\/summary>\r\n public interface ICalculationCommand\r\n {\r\n \/\/\/ <summary>\r\n \/\/\/ Hesaplama fonksiyon ad\u0131\r\n \/\/\/ <\/summary>\r\n string Name { get; }\r\n\r\n \/\/\/ <summary>\r\n \/\/\/ 2 arg\u00fcmanl\u0131 hesaplama fonksiyonumuz i\u00e7in execute edecek metotumuz\r\n \/\/\/ <\/summary>\r\n \/\/\/ <param name=\"arg1\"><\/param>\r\n \/\/\/ <param name=\"arg2\"><\/param>\r\n \/\/\/ <returns><\/returns>\r\n double Execute(double arg1, double arg2);\r\n }\r\n}<\/pre>\nEvet contract’\u0131m\u0131z haz\u0131r durumda.
\n\u015eimdi s\u0131ra geldi PlugInApplicationDomain<\/strong>‘imizi olu\u015fturmaya.<\/p>\nYine \u00f6ncelikle projemize PlugInApplicationDomain\u00a0<\/strong>isminde bir klas\u00f6r daha ekleyerek i\u00e7erisine\u00a0GG.PlugInTabanliHesapMakinesi.PlugInEngine<\/strong>\u00a0isimli bir ClassLibrary projesi daha\u00a0ekleyerek\u00a0GG.PlugInTabanliHesapMakinesi.Contracts\u00a0<\/strong>projemizi referans olarak ekliyorum.<\/p>\n
Bu proje plug-in’lerimiz taray\u0131p\u00a0ICalculationCommand\u00a0<\/strong>contract’\u0131m\u0131zdan inherit alan assembly’lerimizi bulup instance’lerini \u00fcretip\u00a0MainAppicationDomain<\/strong>\u00a0‘imize g\u00f6nderecek olan class’\u0131m\u0131z\u00a0yer alacakt\u0131r.<\/p>\n
GG.PlugInTabanliHesapMakinesi.PlugInEngine <\/strong>projemizin i\u00e7erisine\u00a0CalculationCommandCommunicator\u00a0<\/strong>isimli bir class ekliyorum ve\u00a0MarshalByRefObject<\/strong>, ICalculationCommand<\/strong> interface’lerinden t\u00fcretiyorum.<\/p>\n
Bu class’\u0131m\u0131z\u0131n amac\u0131: Geli\u015ftirece\u011fimiz olan plug-in’lerin sarmalan\u0131p serialize hale getirilip (MarshalByRefObject <\/strong>arac\u0131l\u0131\u011f\u0131 ile)\u00a0farkl\u0131 bir ApplicationDomain<\/strong>‘de instance’s\u0131n\u0131n ve metotlar\u0131n\u0131n kullan\u0131lmas\u0131n\u0131\u00a0sa\u011flayacakt\u0131r.<\/p>\n
\u0130\u015fin \u00f6z\u00fcnde orjinal nesnemizmi\u015f gibi davranan Transparent Proxy<\/strong>‘ler var asl\u0131nda. Bu sayede uygulamam\u0131z i\u00e7in Plug-in geli\u015ftiricilerimiz extradan MarshalByRefObject<\/strong>‘den t\u00fcreyen nesnelere ihtiya\u00e7 duymayacakt\u0131r sadece Contract’<\/strong>\u0131m\u0131z yeterli olacakt\u0131r. Aksi durumda onlara contract’\u0131m\u0131z haricinde\u00a0MarshalByRefObject’den de\u00a0t\u00fcretmelerini s\u00f6ylemek pekte ho\u015f bir durum\u00a0olmayacakt\u0131r, eminim. :)<\/p>\n
\u015eimdi class’\u0131m\u0131za bir g\u00f6z atal\u0131m:<\/p>\n
using GG.PlugInTabanliHesapMakinesi.Contracts;\r\nusing System;\r\n\r\nnamespace GG.PlugInTabanliHesapMakinesi.PlugInEngine\r\n{\r\n \/\/\/ <summary>\r\n \/\/\/ Plug-in'lerimizi serialize hale getirecek class'\u0131m\u0131z.\r\n \/\/\/ <\/summary>\r\n public class CalculationCommandCommunicator : MarshalByRefObject, ICalculationCommand\r\n {\r\n #region Constructor\r\n \/\/\/ <summary>\r\n \/\/\/ CalculationCommand t\u00fcr\u00fcndeki ger\u00e7ek nesnemiz.\r\n \/\/\/ <\/summary>\r\n private ICalculationCommand _RealCommand;\r\n public CalculationCommandCommunicator(ICalculationCommand realCommand)\r\n {\r\n this._RealCommand = realCommand;\r\n }\r\n #endregion\r\n\r\n #region Properties\r\n \/\/\/ <summary>\r\n \/\/\/ Hesaplama fonksiyon ad\u0131\r\n \/\/\/ <\/summary>\r\n public string Name { get { return this._RealCommand.Name; } }\r\n #endregion\r\n\r\n #region Public Methods\r\n \/\/\/ <summary>\r\n \/\/\/ 2 arg\u00fcmanl\u0131 hesaplama fonksiyonumuz i\u00e7in execute edecek metotumuz\r\n \/\/\/ <\/summary>\r\n \/\/\/ <param name=\"arg1\"><\/param>\r\n \/\/\/ <param name=\"arg2\"><\/param>\r\n \/\/\/ <returns><\/returns>\r\n public double Execute(double arg1, double arg2)\r\n {\r\n return this._RealCommand.Execute(arg1, arg2);\r\n }\r\n\r\n public override string ToString()\r\n {\r\n return this.Name;\r\n }\r\n #endregion\r\n }\r\n}<\/pre>\nCalculationCommandCommunicator\u00a0<\/strong>class’\u0131m\u0131z\u0131da tamamlam\u0131\u015f olduk.<\/p>\n
\u015eimdi s\u0131ra geldi plug-in’lerimizi bulup instance’lar\u0131n\u0131 t\u00fcretip bir liste halinde MainApplicationDomain’<\/strong>imize g\u00f6nderecek olan\u00a0PlugInEngine<\/strong> class’\u0131m\u0131z\u0131 olu\u015fturmaya.<\/p>\n
using GG.PlugInTabanliHesapMakinesi.Contracts;\r\nusing System;\r\nusing System.IO;\r\nusing System.Collections.Generic;\r\nusing System.Linq;\r\nusing System.Reflection;\r\n\r\nnamespace GG.PlugInTabanliHesapMakinesi.PlugInEngine\r\n{\r\n \/\/\/ <summary>\r\n \/\/\/ Plug-in'lerimizi bulup instance'lar\u0131n\u0131 t\u00fcretip geyire d\u00f6nderecek olan class'\u0131m\u0131z.\r\n \/\/\/ <\/summary>\r\n public class PlugInEngine : MarshalByRefObject\r\n {\r\n public List<ICalculationCommand> LoadPlugInCommands()\r\n {\r\n var commandList = new List<ICalculationCommand>(); \/\/ Plug-in'lerimizin instance'lar\u0131n\u0131 ekleyece\u011fimiz listemiz\r\n string basePath = AppDomain.CurrentDomain.BaseDirectory + \"PlugIns\"; \/\/ Plug-in'lerimizi bulmak i\u00e7in tar\u0131yaca\u011f\u0131m\u0131z ana PlugIns path'imiz.\r\n\r\n foreach (var filePath in Directory.GetFiles(basePath, \"*.dll\")) \/\/ GetFiles metotuna yazd\u0131\u011f\u0131m\u0131z \"*.dll\" patterni ile ilgili path'imizdeki assembly'lerimizi buluyoruz\r\n {\r\n var loadedAssembly = Assembly.LoadFile(filePath); \/\/ Reflection namespace'si alt\u0131ndaki Assembly s\u0131n\u0131f\u0131 ile ilgili assembly'imizi y\u00fckl\u00fcyoruz\r\n var calculationTypes = loadedAssembly.GetTypes().Where(t => typeof(ICalculationCommand).IsAssignableFrom(t)); \/\/ ICalculationCommand'dan inherit alan nesneleri buluyoruz\r\n\r\n foreach (var calculationType in calculationTypes)\r\n {\r\n var cmd = Activator.CreateInstance(calculationType); \/\/ Instance'sini \u00fcretiyoruz\r\n commandList.Add(new CalculationCommandCommunicator(cmd as ICalculationCommand)); \/\/ \u00dcretti\u011fimiz instance'\u0131m\u0131z\u0131 haz\u0131rlam\u0131\u015f oldu\u011fumuz bizim i\u00e7in serialize hale getirecek olan CalculationCommandCommunicator ile sarmal\u0131yor ve commandList'imize ekliyoruz\r\n }\r\n }\r\n\r\n return commandList;\r\n }\r\n }\r\n}\r\n<\/pre>\nPlugInEngine<\/strong> s\u0131n\u0131f\u0131m\u0131z\u0131da\u00a0MarshalByRefObject’<\/strong>den t\u00fcreterek haz\u0131rlam\u0131\u015f olduk.<\/p>\n
\u015eimdi s\u0131ra geldi \u015fu bahsedip durdu\u011fumuz me\u015fhur MainApplicationDomain’<\/strong>imizi olu\u015fturmaya. :) Hemen MainApplicationDomain\u00a0<\/strong>isminde bir klas\u00f6r daha ekleyerek i\u00e7erisine GG.PlugInTabanliHesapMakinesi.PlugInStarter<\/strong> isimli bir ClassLibrary projesi daha ekliyorum.\u00a0GG.PlugInTabanliHesapMakinesi.Contracts <\/strong>ve\u00a0GG.PlugInTabanliHesapMakinesi.PlugInEngine<\/strong>\u00a0projelerini\u00a0referans olarak eklemeyide unutmayal\u0131m. :)
\nBu proje plug-in’lerimiz i\u00e7in olan PlugInApplicationDomain<\/strong> ‘imizi baz\u0131 yetkilerle olu\u015fturacak ve tan\u0131ml\u0131 plug-in’leri hesap makinesi uygulamam\u0131za dahil edecektir.<\/p>\nHemen\u00a0GG.PlugInTabanliHesapMakinesi.PlugInStarter <\/strong>isimli library’mize\u00a0PlugInStarter<\/strong> isimli bir class ekliyorum ve kodlara bir g\u00f6z atal\u0131m:<\/p>\n
using GG.PlugInTabanliHesapMakinesi.Contracts;\r\nusing System;\r\nusing System.Collections.Generic;\r\nusing System.Security;\r\nusing System.Security.Permissions;\r\n\r\nnamespace GG.PlugInTabanliHesapMakinesi.PlugInStarter\r\n{\r\n \/\/\/ <summary>\r\n \/\/\/ Ana hesap makinesi uygulamam\u0131z i\u00e7inde plug-in'lerimizi \u00e7al\u0131\u015ft\u0131racak olan class'\u0131m\u0131z.\r\n \/\/\/ <\/summary>\r\n public static class PlugInStarter\r\n {\r\n public static List<ICalculationCommand> Start()\r\n {\r\n #region Create AppDomain\r\n var setUp = new AppDomainSetup();\r\n setUp.ApplicationBase = AppDomain.CurrentDomain.BaseDirectory;\r\n\r\n \/\/ K\u0131s\u0131tl\u0131 ve g\u00fcvenli olarak \u00fcretiyoruz. (CAS)\r\n var permissionSet = new PermissionSet(PermissionState.None);\r\n permissionSet.AddPermission(new SecurityPermission(SecurityPermissionFlag.Execution)); \/\/ \u00c7al\u0131\u015ft\u0131rabilmek i\u00e7in yetki veriyoruz\r\n permissionSet.AddPermission(new FileIOPermission(FileIOPermissionAccess.PathDiscovery, AppDomain.CurrentDomain.BaseDirectory)); \/\/ Sadece gerekli klas\u00f6r\u00fcm\u00fcze ke\u015fife izin veriyoruz\r\n permissionSet.AddPermission(new FileIOPermission(FileIOPermissionAccess.Read, AppDomain.CurrentDomain.BaseDirectory + \"PlugIns\")); \/\/ Sadece gerekli klas\u00f6r\u00fcm\u00fcze okuma izni veriyoruz\r\n\r\n var plugInApplicationDomain = AppDomain.CreateDomain(\"Plug In App Domain\", null, setUp, permissionSet); \/\/ Gerekli bilgileri vererek domain ismi, kurulum bilgisi ve g\u00fcvenlik izinleri gibi domainimizi \u00fcretiyoruz\r\n #endregion\r\n\r\n \/\/ Di\u011fer application domain'imizde PlugInEngine'mizi \u00fcretip bu objenin bize ObjectHandle bilgisini geriye d\u00f6ner.\r\n var plugInEngine = (PlugInEngine.PlugInEngine)plugInApplicationDomain.CreateInstanceAndUnwrap(typeof(PlugInEngine.PlugInEngine).Assembly.FullName, typeof(PlugInEngine.PlugInEngine).FullName);\r\n\r\n return plugInEngine.LoadPlugInCommands();\r\n }\r\n }\r\n}\r\n<\/pre>\nPlugInStarter<\/strong>\u00a0class’\u0131m\u0131z\u0131da haz\u0131rlam\u0131\u015f olduk.<\/p>\n
\u015eimdi s\u0131ra geldi yine\u00a0MainApplicationDomain\u00a0<\/strong>klas\u00f6r\u00fc i\u00e7erisinde UI katman\u0131m\u0131z\u0131 haz\u0131rlamaya. Hemen bir\u00a0GG.PlugInTabanliHesapMakinesi.WinUI\u00a0<\/strong>isminde bir Windows Application projesi ekliyorum GG.PlugInTabanliHesapMakinesi.Contracts <\/strong>ve\u00a0GG.PlugInTabanliHesapMakinesi.PlugInStarter <\/strong>projelerini referans olarak ekleyip\u00a0UI<\/strong> formunu a\u015fa\u011f\u0131daki \u015fekilde tasarl\u0131yorum.<\/p>\n
![\"WinUIHesapMakinesi\"](\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\")
\nSay\u0131 1 ve Say\u0131 2 k\u0131s\u0131mlar\u0131na i\u015flem yapaca\u011f\u0131m\u0131z arg1 ve arg2 gelecek, sa\u011f tarafdaki ListBox’a ise Command’lar\u0131m\u0131z gelecek yani plug-in’lerimiz.<\/p>\nHemen ilgili formumuzun kod taraf\u0131na bir g\u00f6z atal\u0131m:<\/p>\n
using GG.PlugInTabanliHesapMakinesi.Contracts;\r\nusing System;\r\nusing System.Collections.Generic;\r\nusing System.Windows.Forms;\r\n\r\nnamespace GG.PlugInTabanliHesapMakinesi.WinUI\r\n{\r\n public partial class frmMain : Form\r\n {\r\n public frmMain()\r\n {\r\n InitializeComponent();\r\n\r\n \/\/ PlugInStarter plug-inlerimizi ilgili application domain'de instance'lar\u0131n\u0131 \u00fcretip bize geriye d\u00f6n\u00fcyor.\r\n List<ICalculationCommand> cmdList = PlugInStarter.PlugInStarter.Start();\r\n lstCommands.Items.AddRange(cmdList.ToArray());\r\n }\r\n\r\n private void btnHesapla_Click(object sender, EventArgs e)\r\n {\r\n if (lstCommands.SelectedItem != null)\r\n {\r\n var cmd = lstCommands.SelectedItem as ICalculationCommand;\r\n var arg1 = Convert.ToDouble(txtSayi1.Text);\r\n var arg2 = Convert.ToDouble(txtSayi2.Text);\r\n var result = cmd.Execute(arg1, arg2);\r\n\r\n MessageBox.Show(string.Format(\"Sonu\u00e7: {0}\", result));\r\n }\r\n }\r\n }\r\n}\r\n<\/pre>\n\u0130\u015fte bu kadar.\u00a0PlugInStarter<\/strong> arac\u0131l\u0131\u011f\u0131 ile ilgili plug-in’lerimiz listemize ekleniyor ve Execute<\/strong> metotumuz arac\u0131l\u0131\u011f\u0131 ile kullan\u0131labilir bir hale geliyor. Uygulamam\u0131z neredeyse tamam. :) Geriye sadece \u00f6rnek bir plug-in tasarlamak kald\u0131. Hi\u00e7 fonksiyonsuz bir hesap makinesi i\u015fimize yaramayacakt\u0131r galiba. :P<\/p>\n
\u015eimdi solution’umuza\u00a0PlugIns\u00a0<\/strong>isimli bir klas\u00f6r daha ekleyerek\u00a0ABCSirketi.ToplamaPlugIn\u00a0<\/strong>isimli bir ClassLibrary daha ekliyorum. (Sanki ba\u015fka bir firma taraf\u0131ndan geli\u015ftirilmi\u015f gibi bir plug-in :))<\/p>\n
\u0130lgili plug-in’i geli\u015ftirebilmeleri i\u00e7in\u00a0da\u011f\u0131tt\u0131\u011f\u0131m\u0131z Contract<\/strong>‘\u0131m\u0131z referans olarak ekleniyor. Hemen\u00a0ToplamaIslemi<\/strong> isminde bir class olu\u015fturuyorum ve ICalculationCommand<\/strong> interface’mizden t\u00fcretiyorum.<\/p>\n
Kodlar\u0131m\u0131za bakmadan \u00f6nce ilgili\u00a0ABCSirketi.ToplamaPlugIn\u00a0<\/strong>projemizin derlendi\u011finde output<\/strong> klas\u00f6r\u00fcn\u00fc \u00e7al\u0131\u015fmam\u0131z s\u0131ras\u0131nda kolayl\u0131k olmas\u0131 a\u00e7\u0131s\u0131ndan PlugInEngine’imizin\u00a0<\/strong>plug-in’lerimizi bulmak i\u00e7in bakt\u0131\u011f\u0131\u00a0GG.PlugInTabanliHesapMakinesi.WinUI <\/strong>klas\u00f6r\u00fc alt\u0131ndaki bin\/PlugIns\u00a0<\/strong>yolunu output klas\u00f6r\u00fc olarak belirliyorum.<\/p>\n
<\/a>
\nPlug-in’imizin kodlar\u0131na \u015fimdi bir bakal\u0131m:<\/p>\nusing GG.PlugInTabanliHesapMakinesi.Contracts;\r\n\r\nnamespace ABCSirketi.ToplamaPlugIn\r\n{\r\n \/\/\/ <summary>\r\n \/\/\/ ABCSirketi taraf\u0131ndan haz\u0131rlanan toplama plug-in'i.\r\n \/\/\/ <\/summary>\r\n public class ToplamaIslemi : ICalculationCommand\r\n {\r\n \/\/ Plug-in'imizin ismi\r\n public string Name\r\n {\r\n get { return \"Toplama\"; }\r\n }\r\n\r\n public double Execute(double arg1, double arg2)\r\n {\r\n return arg1 + arg2; \/\/ Plug-in'imizin toplama i\u015flevi\r\n }\r\n }\r\n}<\/pre>\n\u0130\u015fte bu kadar.
\nArt\u0131k ToplamaPlugIn’imizi derledi\u011fimizde ilgili assembly’miz\u00a0GG.PlugInTabanliHesapMakinesi.WinUI\u00a0<\/strong>alt\u0131ndaki bin\/PlugIns\u00a0<\/strong>yoluna derlenecektir.<\/p>\nArt\u0131k\u00a0plug-in tabanl\u0131 hesap makinemiz \u00e7al\u0131\u015fmaya haz\u0131r! Ben \u00e7al\u0131\u015ft\u0131r\u0131yorum ve ilgili toplama i\u015flemini deniyorum :)<\/p>\n
<\/p>\nG\u00f6r\u00fcld\u00fc\u011f\u00fc gibi uygulamam\u0131z ba\u015far\u0131yla \u00e7al\u0131\u015f\u0131yor plug-in tabanl\u0131. :)
\nPlug-in tabanl\u0131 uygulama geli\u015ftirmede kendimi geli\u015ftirmemde \u00e7ok faydas\u0131 olan Say\u0131n Mustafa Tahir \u00c7akmak<\/a> hocamada te\u015fekk\u00fcr\u00fc bir bor\u00e7 bilirim. :)<\/p>\nBir sonraki makalede g\u00f6r\u00fc\u015fmek dile\u011fiyle.<\/p>\n
\u0130lgili proje’nin \u00e7al\u0131\u015f\u0131r hali ektedir.<\/p>\n
- MainAppicationDomain<\/strong> (Hesap makinesi uygulamam\u0131z ve Plug-in’leri \u00e7al\u0131\u015ft\u0131racak olan proje yer alacak)<\/li>\n
![\"WinUIHesapMakinesi\"](\"\/wp-content\/uploads\/2014\/07\/WinUIHesapMakinesi.jpg\")
![\"outputPlugIns\"](\"\/wp-content\/uploads\/2014\/07\/outputPlugIns.jpg\")
<\/a>