Yukar\u0131da da bahsetti\u011fim gibi, concurrency problemlerini d\u00fc\u015f\u00fcnmeden high-scale<\/strong>, distributed cloud-based<\/strong> uygulamalar geli\u015ftirebilmemiz i\u00e7in Microsoft’un 2014 y\u0131l\u0131nda duyurmu\u015f oldu\u011fu bir framework\/platform’dur.<\/p><\/blockquote>\n Orleans, concurrency ve high-scale gibi problemleri \u00e7\u00f6zebilmek i\u00e7in\u00a0altyap\u0131s\u0131nda Actor Model<\/a><\/em> yakla\u015f\u0131m\u0131n\u0131 temel almaktad\u0131r ve tamamen\u00a0horizontal scalability<\/strong>‘e odaklanmaktad\u0131r.<\/p>\n Buradan anlayabilece\u011fimiz \u00fczere, message’lar sayesinde actor’ler ya\u015famlar\u0131n\u0131 s\u00fcrd\u00fcrebilmektedirler ve actor’ler bir y\u0131\u011f\u0131ndan meydana gelmektedirler. Bu model’in \u00f6z\u00fc, actor’leri temel olarak basit\u00a0computing units<\/strong> olarak kullanmakt\u0131r diyebiliriz. Ayr\u0131ca actor’ler state’leri tutabildi\u011fi gibi, davran\u0131\u015flar\u0131 da tutabilmektedir ve di\u011fer actor’ler ile message yoluyla ileti\u015fim kurabilmektedirler.<\/p>\n Orleans ise actor based bir platform’dur.\u00a0Actor model, yap\u0131s\u0131 gere\u011fi high availability<\/strong> ve low latency<\/strong>‘i kolayl\u0131kla sa\u011flayabilmektedir. Orleans di\u011fer actor model platform’lar\u0131n\u0131n aksine virtual actor abstraction’\u0131 ile\u00a0reliability<\/strong> ve distributed resource management<\/strong>\u00a0gibi bir \u00e7ok complexity’i kendisi handle edip, developer’a herhangi bir ek distributed system problem’leri \u00e7\u0131kartmamaktad\u0131r.<\/p>\n Ayr\u0131ca actor’ler i\u00e7erisinde\u00a0single-threaded execution context sundu\u011fundan dolay\u0131, concurrency gibi problemleri d\u00fc\u015f\u00fcnmeden geli\u015ftirme yapabilmeye de olanak sa\u011flamaktad\u0131r. Bunlara ek olarak Orleans taraf\u0131nda cluster i\u00e7erisine dynamically<\/strong> olarak\u00a0node’lar eklenebilmektedir ve y\u00fck\u00fc bunlara otomatik olarak distribute edebilmektedir de.<\/p>\n Dilerseniz konunun devam\u0131na hello world d\u00fczeyinde \u00f6rnek bir proje ile devam edelim. \u00d6rne\u011fimizi ger\u00e7ekle\u015ftirirken baz\u0131 Orleans terimlerine de de\u011finiyor olaca\u011f\u0131z. \u00d6ncelikle buraya<\/a>\u00a0t\u0131klayarak, Visual Studio \u00fczerine\u00a0Microsoft Orleans Tools’u indirelim ve ard\u0131ndan kurulum i\u015flemini ger\u00e7ekle\u015ftirelim. Bu paket ile bir \u00e7ok initialization i\u015flemlerinden kurtulaca\u011f\u0131z ve bir ka\u00e7 wrapper’a sahip olaca\u011f\u0131z.<\/p>\n “OrleansHelloWorld” isminde bir blank solution olu\u015ftural\u0131m ve i\u00e7erisine a\u015fa\u011f\u0131daki gibi “HelloWorldGrainInterfaces” isminde bir Orleans Grain Interface Collection projesi ekleyelim.<\/p>\n Ekledikten sonra otomatik olarak olu\u015fan “IGrain1” interface’ini “IHello” olarak g\u00fcncelleyerek, a\u015fa\u011f\u0131daki gibi d\u00fczenleyelim.<\/p>\n Peki nedir bu Grain<\/strong> dersek e\u011fer, Orleans i\u00e7erisindeki actor’ler, Grain olarak adland\u0131r\u0131lmaktad\u0131r. Bunun d\u0131\u015f\u0131nda eklemi\u015f oldu\u011fumuz “SayHello” method’una dikkat edersek e\u011fer, Orleans implemente edilecek t\u00fcm method’lar\u0131 async<\/strong>\u00a0olarak istemektedir. Su sebeple task based olarak kodlama yapmam\u0131z gerekmektedir.<\/p>\n \u015eimdi ise concrete grain’i olu\u015fturabilmek i\u00e7in solution i\u00e7erisine, “HelloWorldGrains” isminde bir\u00a0Orleans Grain Class Collection projesi ekleyelim ve ard\u0131ndan “HelloWorldGrainInterfaces” projesini referans olarak g\u00f6sterelim. Projenin eklenmesinden sonra default olarak elen “Grain1” isimli class’\u0131, “HelloGrain” olarak g\u00fcncelleyelim ve a\u015fa\u011f\u0131daki gibi kodlayal\u0131m.<\/p>\n public class HelloGrain : Grain, IHello { public Task SayHello(string name) { return Task.FromResult($”Hello {name}”); } } }<\/p>\n Grain implementasyonu i\u00e7in “Grain” abstract class’\u0131n\u0131 ve olu\u015fturmu\u015f oldu\u011fumuz “IHello” interface’ini implemente ettik.<\/p>\n \u015eimdi s\u0131ra geldi grain’leri host edece\u011fimiz silo’yu olu\u015fturmaya. Silo \u00fczerinden self-hosted olarak olu\u015fturmu\u015f oldu\u011fumuz “HelloGrain” i active edip, invoke edece\u011fiz. Bunun i\u00e7in \u00f6ncelikle “HelloWorld” isminde bir Orleans Dev\/Test Host projesi olu\u015ftural\u0131m.<\/p>\n Projenin olu\u015fturulmas\u0131n\u0131n ard\u0131ndan “HelloWorldGrainInterfaces” ve “HelloWorldGrains” projelerini referans olarak ekleyelim. “Program.cs” i a\u00e7arsan\u0131z otomatik olarak Orleans taraf\u0131ndan, Orleans test silo host template’i geldi\u011fini g\u00f6rebilirsiniz.<\/p>\n Template’e dikkat edersek, “OrleansHost” isminde kendi appdomain’ini olu\u015fturuyor ve init k\u0131sm\u0131nda ise “InitSilo” method’u ile, “OrleansHostWrapper” \u00fczerinden silo’nun initializing i\u015flemlerini ger\u00e7ekle\u015ftiriyor.<\/p>\n A\u015fa\u011f\u0131daki kod sat\u0131rlar\u0131na dikkat edersek e\u011fer burada olu\u015fturmu\u015f oldu\u011fumuz grain’i, “GrainClient” \u00fczerinden active edip invoke ediyoruz.<\/p>\n “HelloWorld” projesini \u00e7al\u0131\u015ft\u0131ral\u0131m ve sonucuna bir bakal\u0131m.<\/p>\n \u0130lk ak\u0131\u015f i\u00e7erisinde dikkat edersek, en a\u015fa\u011f\u0131da “Successfully started Orleans silo ‘GOKGOKALP’ as a Primary node.” mesaj\u0131n\u0131 g\u00f6rece\u011fiz. Test silo host’unu kendi process’imiz \u00fczerinde ba\u015flatt\u0131\u011f\u0131m\u0131z i\u00e7in, otomatik bir \u015fekilde primary node olarak belirlemi\u015ftir. Ak\u0131\u015f\u0131n devam\u0131na bakt\u0131\u011f\u0131m\u0131zda ise:<\/p>\n![\"\"](\"\/wp-content\/uploads\/2017\/03\/orleans-project.png\")
<\/a><\/p>\nNedir Bu Orleans Project?<\/h4>\n
Actor’ler hakk\u0131nda bir ka\u00e7 \u015fey s\u00f6ylemem gerekirse e\u011fer:<\/h5>\n
\n
<\/h5>\nPeki actor’ler k\u0131saca ne yapar?<\/h5>\n
\n
Hello World<\/h4>\n
<\/a><\/p>\nusing System.Threading.Tasks;\r\nusing Orleans;\r\n\r\nnamespace HelloWorldGrainInterfaces\r\n{\r\n \/\/\/ <summary>\r\n \/\/\/ Grain interface IHello\r\n \/\/\/ <\/summary>\r\n public interface IHello : IGrainWithIntegerKey\r\n {\r\n Task<string> SayHello(string name);\r\n }\r\n}<\/pre>\nusing System.Threading.Tasks;\r\nusing Orleans;\r\nusing HelloWorldGrainInterfaces;\r\n\r\nnamespace HelloWorldGrains\r\n{\r\n \/\/\/ <summary>\r\n \/\/\/ Grain implementation class HelloGrain.\r\n \/\/\/ <\/summary>\r\n public class HelloGrain : Grain, IHello\r\n {\r\n public Task<string> SayHello(string name)\r\n {\r\n return Task.FromResult($\"Hello {name}\");\r\n }\r\n }\r\n}<\/pre>\nusing System;\r\n\r\nusing Orleans;\r\nusing Orleans.Runtime.Configuration;\r\nusing HelloWorldGrainInterfaces;\r\n\r\nnamespace HelloWorld\r\n{\r\n \/\/\/ <summary>\r\n \/\/\/ Orleans test silo host\r\n \/\/\/ <\/summary>\r\n public class Program\r\n {\r\n static void Main(string[] args)\r\n {\r\n \/\/ The Orleans silo environment is initialized in its own app domain in order to more\r\n \/\/ closely emulate the distributed situation, when the client and the server cannot\r\n \/\/ pass data via shared memory.\r\n AppDomain hostDomain = AppDomain.CreateDomain(\"OrleansHost\", null, new AppDomainSetup\r\n {\r\n AppDomainInitializer = InitSilo,\r\n AppDomainInitializerArguments = args,\r\n });\r\n\r\n var config = ClientConfiguration.LocalhostSilo();\r\n GrainClient.Initialize(config);\r\n\r\n \/\/ TODO: once the previous call returns, the silo is up and running.\r\n \/\/ This is the place your custom logic, for example calling client logic\r\n \/\/ or initializing an HTTP front end for accepting incoming requests.\r\n\r\n Console.WriteLine(\"Orleans Silo is running.\\nPress Enter to terminate...\");\r\n\r\n var user = GrainClient.GrainFactory.GetGrain<IHello>(0);\r\n Console.WriteLine(user.SayHello(\"G\u00f6khan\").Result);\r\n\r\n Console.ReadLine();\r\n\r\n hostDomain.DoCallBack(ShutdownSilo);\r\n }\r\n\r\n static void InitSilo(string[] args)\r\n {\r\n hostWrapper = new OrleansHostWrapper(args);\r\n\r\n if (!hostWrapper.Run())\r\n {\r\n Console.Error.WriteLine(\"Failed to initialize Orleans silo\");\r\n }\r\n }\r\n\r\n static void ShutdownSilo()\r\n {\r\n if (hostWrapper != null)\r\n {\r\n hostWrapper.Dispose();\r\n GC.SuppressFinalize(hostWrapper);\r\n }\r\n }\r\n\r\n private static OrleansHostWrapper hostWrapper;\r\n }\r\n}<\/pre>\nvar user = GrainClient.GrainFactory.GetGrain(0);\r\nConsole.WriteLine(user.SayHello(\"G\u00f6khan\").Result);<\/pre>\n
<\/a><\/p>\n