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小編給大家分享一下c# 怎么用lock解決緩存擊穿,相信大部分人都還不怎么了解,因此分享這篇文章給大家參考一下,希望大家閱讀完這篇文章后大有收獲,下面讓我們一起去了解一下吧!
緩存擊穿是指緩存中沒(méi)有但數(shù)據(jù)庫(kù)中有的數(shù)據(jù)(一般是緩存時(shí)間到期),這時(shí)由于并發(fā)用戶特別多,同時(shí)讀緩存沒(méi)讀到數(shù)據(jù),又同時(shí)去數(shù)據(jù)庫(kù)去取數(shù)據(jù),引起數(shù)據(jù)庫(kù)壓力瞬間增大,造成過(guò)大壓力。
2.1、根據(jù)key生成object()
private static object GetMemoryCacheLockObject(string key) { string cacheLockKey = string.Format(MemoryCacheLockObjectFormat, key); lock (CacheObject) { var lockObject = CacheObject[cacheLockKey]; if (lockObject == null) { // 取得每個(gè) Key專屬的 lock object;若同時(shí)有多個(gè) thread要求相同資料,只會(huì)(到資料庫(kù))查第一次,剩下的從 cache讀取 lockObject = new object(); CacheObject.Set( cacheLockKey, lockObject, new System.Runtime.Caching.CacheItemPolicy() { AbsoluteExpiration = DateTimeOffset.UtcNow.AddMinutes(10) } ); } return lockObject; } }
2.2、lock住GetMemoryCacheLockObject(key)
public T Get<T>(string key, Func<T> getDataWork, TimeSpan absoluteExpireTime, bool forceRefresh = false, bool returnCopy = true) where T : class { try { lock (GetMemoryCacheLockObject(key)) { /* System.ArgumentNullException: Value cannot be null. at System.Threading.Monitor.Enter(Object obj) at BQoolCommon.Helpers.Cache.MemoryCacheLayer.Get[T](String key, Func`1 getDataWork, TimeSpan absoluteExpireTime, Boolean forceRefresh, Boolean returnCopy) in D:\Source\BQoolCommon\BQoolCommon.Helpers\Cache\MemoryCacheLayer.cs:line 46 */ T result = CacheObject[key] as T; if (result != null && forceRefresh) {// 是否清除Cache,強(qiáng)制重查 result = null; } if (result == null) { //執(zhí)行取得資料的委派作業(yè) result = getDataWork(); if (result != null) { Set(key, result, absoluteExpireTime); } } if (returnCopy) { //複製一份新的參考 string serialize = JsonConvert.SerializeObject(result); return JsonConvert.DeserializeObject<T>(serialize); } else { return result; } } } catch { return getDataWork(); } }
T result = CacheObject[key] as T;
try { lock (GetMemoryCacheLockObject(key)) { /* System.ArgumentNullException: Value cannot be null. at System.Threading.Monitor.Enter(Object obj) at BQoolCommon.Helpers.Cache.MemoryCacheLayer.Get[T](String key, Func`1 getDataWork, TimeSpan absoluteExpireTime, Boolean forceRefresh, Boolean returnCopy) in D:\Source\BQoolCommon\BQoolCommon.Helpers\Cache\MemoryCacheLayer.cs:line 46 */ T result = CacheObject[key] as T;
string cacheLockKey = string.Format(MemoryCacheLockObjectFormat, key); lock (CacheObject) { var lockObject = CacheObject[cacheLockKey]; if (lockObject == null) { // 取得每個(gè) Key專屬的 lock object;若同時(shí)有多個(gè) thread要求相同資料,只會(huì)(到資料庫(kù))查第一次,剩下的從 cache讀取 lockObject = new object();
以上是“c# 怎么用lock解決緩存擊穿”這篇文章的所有內(nèi)容,感謝各位的閱讀!相信大家都有了一定的了解,希望分享的內(nèi)容對(duì)大家有所幫助,如果還想學(xué)習(xí)更多知識(shí),歡迎關(guān)注億速云行業(yè)資訊頻道!
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