vps上的网站运行太慢/热搜词工具

环境：

net4.5

vs2022

目录

单体服务器：

分布式负载服务器：

1、Redis:

2、RedLock:

模拟商品抢购，单个服务器，可以通过本地服务器缓存或数据库锁就可以处理，

分布式服务器的话，想要实现进程与进程之间实现同步锁，可以使用redis、数据库锁、ZooKeeper来实现。

单体服务器：

可以通过HttpRuntime.Cache缓存来简单实现

public class RuntimeCacheLock{private static System.Web.Caching.Cache cache = HttpRuntime.Cache;private static readonly object lockObj = new object();public bool GetLock(string lockKey, object value, int lockExpirySeconds = 10, double waitLockSeconds = 0){DateTime begin = DateTime.Now;while (true){lock (lockObj){//循环获取取锁if (object.ReferenceEquals(cache.Get(lockKey), null)){//设置锁的过期时间cache.Add(lockKey, value, null, DateTime.UtcNow.AddSeconds(lockExpirySeconds),System.Web.Caching.Cache.NoSlidingExpiration, CacheItemPriority.Default, null);return true;}}//不等待锁则返回if (waitLockSeconds == 0) break;//超过等待时间，则不再等待if ((DateTime.Now - begin).TotalSeconds >= waitLockSeconds) break;}return false;}public object GetLockValue(string lockKey){object obj = cache.Get(lockKey);if (obj != null){return obj;}return null;}public void ReleaseLock(string key){cache.Remove(key);}}
}

program：

class Program
{static void Main(string[] args){Console.WriteLine($"主线程{Thread.CurrentThread.ManagedThreadId}");for (int i = 0; i < 50; i++){ThreadPool.QueueUserWorkItem((t) =>{Show();});}Console.ReadKey();}private static int value = 30;private static void Show(){string key = nameof(Show);string guid = Guid.NewGuid().ToString();RuntimeCacheLock runtimeCacheLock = new RuntimeCacheLock();try{if (runtimeCacheLock.GetLock(key, guid, 5, 10)){value--;Thread.Sleep(1000);//模拟业务操作if (value <= 0){Console.WriteLine($"商品已经无货");return;}else{Console.WriteLine($"value={value}");return;}}else{Console.WriteLine("稍后重试");return;}}finally{if (runtimeCacheLock.GetLockValue(key) != null && guid.Equals(runtimeCacheLock.GetLockValue(key)))runtimeCacheLock.ReleaseLock(key);}}
}

分布式负载服务器：

1、Redis:

单节点

引用CSRedisCore库，版本3.6.8.0

    public class RedisLock{public RedisLock(){var csredis = new CSRedis.CSRedisClient("127.0.0.1:6379");RedisHelper.Initialization(csredis);//初始化}public bool GetLock(string lockKey, object value, int lockExpirySeconds = 10, double waitLockSeconds = 0){DateTime begin = DateTime.Now;while (true){if (RedisHelper.SetNx(lockKey, value))//key值不存在时，设置缓存{RedisHelper.Expire(lockKey, lockExpirySeconds);return true;}//不等待锁则返回if (waitLockSeconds == 0) break;//超过等待时间，则不再等待if ((DateTime.Now - begin).TotalSeconds >= waitLockSeconds) break;}return false;}public object GetLockValue(string lockKey){string obj = RedisHelper.Get(lockKey);if (obj != null){return obj;}return null;}public void ReleaseLock(string key){RedisHelper.Del(key);}}

program：

class Program{static void Main(string[] args){Console.WriteLine($"主线程{Thread.CurrentThread.ManagedThreadId}");for (int i = 0; i < 50; i++){ThreadPool.QueueUserWorkItem((t) =>{RedisShow();});}Console.ReadKey();}private static int value = 30;private static void RedisShow(){string key = nameof(RedisShow);string guid = Guid.NewGuid().ToString();RedisLock @lock= new RedisLock();try{if (@lock.GetLock(key, guid, 5, 10)){value--;Thread.Sleep(1000);if (value <= 0){Console.WriteLine($"商品已经无货");return;}else{Console.WriteLine($"value={value}");return;}}else{Console.WriteLine("稍后重试");return;}}finally{if (@lock.GetLockValue(key) != null && guid.Equals(@lock.GetLockValue(key)))@lock.ReleaseLock(key);}}}

2、RedLock:

多个单节点redis组成

引用RedLockNet库，版本2.1.0.0

internal class RedLock{private static RedLockFactory _redlockFactory;static RedLock(){var endPoints = new List<RedLockEndPoint>{new DnsEndPoint("localhost", 6379),//new DnsEndPoint("redis2", 6379),//new DnsEndPoint("redis3", 6379)};_redlockFactory = RedLockFactory.Create(endPoints);}private IRedLock _redLock;public bool GetLock(string lockKey, object value, int lockExpirySeconds = 10, double waitLockSeconds = 10){var expiry = TimeSpan.FromSeconds(lockExpirySeconds);//过期时间var wait = TimeSpan.FromSeconds(waitLockSeconds);//等待时间var retry = TimeSpan.FromSeconds(2);//重试时间_redLock = _redlockFactory.CreateLock(lockKey, expiry, wait, retry);//确保获取到锁if (_redLock.IsAcquired){return true;}return false;}public object GetLockValue(string lockKey){return string.Empty;}public void ReleaseLock(string lockKey){if (_redLock != null)_redLock.Dispose();//if (_redlockFactory != null)//    _redlockFactory.Dispose();}}

program：

class Program{static void Main(string[] args){Console.WriteLine($"主线程{Thread.CurrentThread.ManagedThreadId}");for (int i = 0; i < 50; i++){RedLock @lock = new RedLock();ThreadPool.QueueUserWorkItem((t) =>{RedLockShow(@lock);});}Console.ReadKey();}private static int value = 30;private static void RedLockShow(RedLock @lock){string key = nameof(RedLockShow);string guid = Guid.NewGuid().ToString();try{if (@lock.GetLock(key, guid, 10, 20)){value--;Thread.Sleep(1000);if (value <= 0){Console.WriteLine($"商品已经无货");return;}else{Console.WriteLine($"value={value}");return;}}else{Console.WriteLine("稍后重试");return;}}finally{@lock.ReleaseLock(key);}}}

参考：【分布式锁】三种分布式锁的实现【原创】_一直加班的程序猿-CSDN博客