{"id":15131,"date":"2020-04-14T19:26:21","date_gmt":"2020-04-14T19:26:21","guid":{"rendered":"https:\/\/www.gencayyildiz.com\/blog\/?p=15131"},"modified":"2020-04-14T19:26:21","modified_gmt":"2020-04-14T19:26:21","slug":"redis-yazi-serisi-5-asp-net-coreda-in-memory-cache-kullanimi","status":"publish","type":"post","link":"https:\/\/www.gencayyildiz.com\/blog\/redis-yazi-serisi-5-asp-net-coreda-in-memory-cache-kullanimi\/","title":{"rendered":"Redis Yaz\u0131 Serisi 5 – Asp.NET Core’da In-Memory Cache Kullan\u0131m\u0131"},"content":{"rendered":"

<\/div>\n

Merhaba,<\/p>\n

Redis yaz\u0131 serisinin<\/a> bu be\u015finci makalesinde Redis mimarisinin temellerini daha iyi atabilmek i\u00e7in \u00f6ncelikle Asp.NET Core mimarisinde In-Memory Cache kullan\u0131m\u0131n\u0131 inceleyece\u011fiz. B\u00f6ylece uygun temellendirmeyi yapt\u0131\u011f\u0131m\u0131z s\u00fcrece makale serimizin sonraki makalelerinde Distributed Caching sistemi olan Redis sistemine tam teferruatl\u0131 giri\u015f yapabilecek zemini olu\u015fturmu\u015f olaca\u011f\u0131z.<\/p>\n

Ba\u015flarken<\/h3>\n
\u0130\u00e7eri\u011fin seyrine e\u015f zamanl\u0131 e\u015flik edebilmek i\u00e7in elinizin alt\u0131nda bir Asp.NET Core uygulamas\u0131 olmas\u0131na \u00f6zen g\u00f6stermenizi tavsiye ederim.<\/p>\n
Service ve Aray\u00fcz Tan\u0131t\u0131m\u0131<\/h3>\n
Asp.NET Core uygulamalar\u0131nda In-Memory Cache yapabilmek i\u00e7in ‘AddMemoryCache<\/em>‘ servisini kullanmaktay\u0131z. Bu servisi uygulamaya dahil ettikten sonra ‘IMemoryCache<\/em>‘ interface’i ile dependency injection taleplerinde bulunarak cacheleme operasyonlar\u0131n\u0131 ger\u00e7ekle\u015ftirebiliriz.<\/p>\n
AddMemoryCache;<\/p>\n
\r\n public class Startup\r\n {\r\n public void ConfigureServices(IServiceCollection services)\r\n {\r\n .\r\n .\r\n services.AddMemoryCache();\r\n .\r\n .\r\n }\r\n\r\n .\r\n .\r\n .\r\n }\r\n<\/pre>\n
IMemoryCache;<\/p>\n
\r\n public class EmployeeController : Controller\r\n {\r\n IMemoryCache _memoryCache;\r\n public EmployeeController(IMemoryCache memoryCache)\r\n {\r\n _memoryCache = memoryCache;\r\n }\r\n }\r\n<\/pre>\n
\u015eimdi dependency injection ile talep etti\u011fimiz ‘IMemoryCache’ nesnesi \u00fczerinden caching i\u015flemlerinde kullanaca\u011f\u0131m\u0131z metot ve propertyleri inceleyelim.<\/p>\n
Get – Set Fonksiyonlar\u0131<\/strong>
\n\u0130simlerinden de anla\u015f\u0131laca\u011f\u0131 \u00fczere memory’e data cachelemek ve cachelenen datay\u0131 okumak i\u00e7in Get ve Set metotlar\u0131 kullan\u0131lmaktad\u0131r. key – value diziliminde olan bu metotlardan Set metodu datay\u0131 cachelemek, Get metodu ise cache’de ki datay\u0131 okumak\/elde etmek i\u00e7in kullan\u0131l\u0131r.<\/p>\n
\r\n public IActionResult SetCache()\r\n {\r\n _memoryCache.Set("employeeName", "Muiddin Impatrino");\r\n return View();\r\n }\r\n\r\n public IActionResult GetCache()\r\n {\r\n string name = _memoryCache.Get<string>("employeeName");\r\n return View();\r\n }\r\n<\/pre>\n
Remove Fonksiyonu<\/strong>
\nCachelenmi\u015f datay\u0131 silmek i\u00e7in kullan\u0131l\u0131r.<\/p>\n
\r\n public void RemoveCache()\r\n {\r\n _memoryCache.Remove("employeeName");\r\n }\r\n<\/pre>\n
TryGetValue Fonksiyonu<\/strong>
\nCache’de belirtilen key de\u011ferine uygun veriyi sorgular. Veri yoksa ‘false’ e\u011fer varsa ‘true’ d\u00f6nd\u00fcrerek ‘out’ olan ikinci parametresinde de cacheden datay\u0131 d\u00f6nd\u00fcr\u00fcr.<\/p>\n
\r\n public IActionResult GetCache()\r\n {\r\n if (_memoryCache.TryGetValue<string>("employeeName", out string data))\r\n {\r\n \/\/data burada elde edilmi\u015ftir\r\n }\r\n return View();\r\n }\r\n<\/pre>\n
GetOrCreate Fonksiyonu<\/strong>
\nBelirtilen key de\u011ferinde data var m\u0131 kontrol eder, yoksa olu\u015fturur.<\/p>\n
\r\n public IActionResult GetCache()\r\n {\r\n string name = _memoryCache.GetOrCreate<string>("employeeName", entry =>\r\n {\r\n entry.SetValue("Muiddin Impatrino");\r\n Console.WriteLine(DateTime.Now);\r\n return entry.Value.ToString();\r\n });\r\n\r\n return View();\r\n }\r\n<\/pre>\n
Absolute&Sliding Expiration<\/strong>
\nCache’de tutulacak datan\u0131n ya\u015fam s\u00fcresini belirlememizi sa\u011flayan \u00f6zelliklerdir. Absolute, datan\u0131n cache’de tutulma s\u00fcresini belirlerken; Sliding, belirtilen s\u00fcre zarf\u0131nda cache’den data talep edilirse e\u011fer bir o kadar daha tutulma s\u00fcresini uzatacak aksi taktirde datay\u0131 silecektir. Her ikiside ayn\u0131 anda kullan\u0131ld\u0131\u011f\u0131 zaman sliding, absolute’te belirtilen s\u00fcre dolana kadar periyodik i\u015flevine devam edecektir.<\/p>\n
‘GetOrCreate’ metoduyla kullan\u0131m\u0131 a\u015fa\u011f\u0131daki gibidir;<\/p>\n
\r\n public void GetCache()\r\n {\r\n DateTime date = _memoryCache.GetOrCreate<DateTime>("date", entry =>\r\n {\r\n entry.AbsoluteExpiration = DateTime.Now.AddSeconds(30);\/\/Cache'de ki datan\u0131n \u00f6mr\u00fc 10 saniye olarak belirlenmi\u015ftir.\r\n entry.SlidingExpiration = TimeSpan.FromSeconds(5);\/\/Cache'de ki datan\u0131n \u00f6mr\u00fc 2 saniye olarak belirlenmi\u015ftir.\r\n \/\/2 saniye i\u00e7erisinde bir istek yap\u0131l\u0131rsa kal\u0131\u015f s\u00fcresi 2 saniye daha uzayacakt\u0131r.\r\n \/\/Absolute de\u011feri belirtildi\u011finden dolay\u0131 bu s\u00fcre\u00e7 totalde 2 saniye boyunca s\u00fcrecektir.\r\n DateTime value = DateTime.Now;\r\n Console.WriteLine($"* Set Cache : {value}");\r\n return value;\r\n });\r\n\r\n Console.WriteLine($"Get Cache : {date}");\r\n }\r\n<\/pre>\n
$\"Redis$ <\/a><\/p>\n
‘Set’ metoduyla ise a\u015fa\u011f\u0131daki gibi ‘MemoryCacheEntryOptions’ nesnesiyle kullanabilirsiniz;<\/p>\n
\r\n public IActionResult SetCache()\r\n {\r\n MemoryCacheEntryOptions options = new MemoryCacheEntryOptions();\r\n options.AbsoluteExpiration = DateTime.Now.AddSeconds(30);\r\n options.SlidingExpiration = TimeSpan.FromSeconds(5);\r\n _memoryCache.Set("date", DateTime.Now, options);\r\n\r\n return RedirectToAction(nameof(GetCache));\r\n }\r\n public IActionResult GetCache()\r\n {\r\n if (_memoryCache.TryGetValue<DateTime>("date", out DateTime date))\r\n {\r\n Console.WriteLine($"Get Cache : {date}");\r\n }\r\n return View();\r\n }\r\n<\/pre>\n
Cache Priority<\/strong>
\nYay\u0131n s\u00fcreci boyunca cache’e depolanan veriler memory’i haddinden fazla \u015fi\u015firebilir ve yeni veriler i\u00e7in sistem taraf\u0131ndan var olan veriler silinmek istenebilir. \u0130\u015fte b\u00f6yle bir durumda cache’den silinecek olan verilerin \u00f6nceliklerini ve hangilerinin kal\u0131c\u0131 olaca\u011f\u0131n\u0131 Priority de\u011feri arac\u0131l\u0131\u011f\u0131yla belirlemekteyiz.<\/p>\n
Priority de\u011feri; Low<\/em>, Normal<\/em>, High<\/em> ve NeverRemove<\/em> olmak \u00fczere d\u00f6rt de\u011fer almaktad\u0131r. Bu de\u011ferleri s\u0131ras\u0131yla a\u00e7\u0131klarsak e\u011fer;
\nLow<\/em> : \u00d6nem derecesi en d\u00fc\u015f\u00fck olan datad\u0131r. \u0130htiya\u00e7 do\u011frultusunda ilk silinecek datad\u0131r.
\nNormal<\/em> : \u00d6nem derecesi Low’dan sonra gelen datad\u0131r.
\nHigh<\/em> : \u00d6nemli veridir. \u00c7ok zaruri oldu\u011fu taktirde cache’den silinecektir.
\nNeverRemove<\/em> : Kesinlikle silinmemesi gereken datad\u0131r. S\u0131n\u0131ra gelinen bir memory’de Priority de\u011feri NeverRemove olan datalarla s\u0131n\u0131r a\u015f\u0131l\u0131rsa exception f\u0131rlat\u0131l\u0131r.<\/p>\n
\r\n public void SetCache()\r\n {\r\n MemoryCacheEntryOptions options = new MemoryCacheEntryOptions();\r\n options.Priority = CacheItemPriority.High;\r\n _memoryCache.Set("date", DateTime.Now, options);\r\n }\r\n<\/pre>\n
RegisterPostEvictionCallback Olay\u0131<\/strong>
\nCachelenmi\u015f bir datan\u0131n hangi sebepten dolay\u0131 memory’den silindi\u011fine dair bilgi edinmemizi sa\u011flayan olay\u0131 f\u0131rlatan bir fonksiyondur.
\nParametre olarak
\n`public delegate void PostEvictionDelegate(object key, object value, EvictionReason reason, object state)<\/code> \nimzas\u0131na sahip bir delegate almaktad\u0131r. Bu delegate arac\u0131l\u0131\u011f\u0131yla temsil edilen fonksiyonun ‘key’ parametresine cachelenmi\u015f datan\u0131n keyini, ‘value’ parametresine de\u011ferini, ‘reason’ parametresine ise silinme sebebini d\u00f6nd\u00fcrmektedir.<\/p>\n`
\r\n public void GetCache()\r\n {\r\n DateTime date = _memoryCache.GetOrCreate<DateTime>("date", entry =>\r\n {\r\n entry.RegisterPostEvictionCallback((key, value, reason, state) =>\r\n {\r\n Console.WriteLine($"Key : {key}\\nValue : {value}\\nReason : {reason}\\nState : {state}");\r\n });\r\n DateTime value = DateTime.Now;\r\n Console.WriteLine($"* Set Cache : {value}");\r\n return value;\r\n });\r\n\r\n Console.WriteLine($"Get Cache : {date}");\r\n }\r\n<\/pre>\n<\/a><\/p>\n Evet… B\u00f6ylece Asp.NET Core uygulamalar\u0131nda In-Memory Caching’in nas\u0131l yap\u0131ld\u0131\u011f\u0131n\u0131 san\u0131r\u0131m yeterince g\u00f6rm\u00fc\u015f, incelemi\u015f olduk. Bu i\u00e7eri\u011fimizden sonra art\u0131k yaz\u0131 serimizde Redis ile ilgili birebir i\u00e7erikler olu\u015fturarak esas konumuza temas edebiliriz. <\/p>\n \u0130lgilenenlerin faydalanmas\u0131 dile\u011fiyle… \nSonraki yaz\u0131lar\u0131mda g\u00f6r\u00fc\u015fmek \u00fczere… \n\u0130yi \u00e7al\u0131\u015fmalar…<\/p>\n","protected":false},"excerpt":{"rendered":" Merhaba, Redis yaz\u0131 serisinin bu be\u015finci makalesinde Redis mimarisinin temellerini daha iyi atabilmek i\u00e7in \u00f6ncelikle Asp.NET Core mimarisinde In-Memory Cache kullan\u0131m\u0131n\u0131 inceleyece\u011fiz. B\u00f6ylece uygun temellendirmeyi yapt\u0131\u011f\u0131m\u0131z s\u00fcrece makale serimizin sonraki makalelerinde Distributed Caching sistemi...<\/p>\n","protected":false},"author":1,"featured_media":15045,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3383],"tags":[3407,3406,2679,2867,3409,2865,2866,2869,3384,3410,3408],"class_list":["post-15131","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-redis","tag-absolute-expiration","tag-addmemorycache","tag-asp-net-core","tag-asp-net-core-in-memory-cache","tag-cache-priority","tag-imemorycache","tag-in-memory-cache","tag-memorycacheentryoptions","tag-redis","tag-registerpostevictioncallback","tag-sliding-expiration"],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/posts\/15131","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/comments?post=15131"}],"version-history":[{"count":31,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/posts\/15131\/revisions"}],"predecessor-version":[{"id":15167,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/posts\/15131\/revisions\/15167"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/media\/15045"}],"wp:attachment":[{"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/media?parent=15131"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/categories?post=15131"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/tags?post=15131"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}