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.net core Redis分布式缓存的客户端实现
2019-08-19 【.NET CORE】 1822人浏览
由于是基于.net-core平台,所以,我们最好是基于IDistributedCache接口来实现。ASP.NET-CORE下的官方redis客户端实现是基于StackExchange的。但是官方提供的IDistributeCache接口中的方法只是增删改查,我们可以继续拓展,增加订阅/发布,消息队列,当然这些方法必须是基于底层的StackExchange相对应的方法来做的。
如果我们要实现自己的Redis客户端,同时不使用底层的StackExchange驱动,可以派生一个继承自IDistributedCache的接口,定义自己需要的方法,例如:
public interface IServiceStackRedisCache : IDistributedCache{ void Delete(T item); // 删除 void DeleteAll (T item); T Get (string id); IQueryable GetAll (); IQueryable GetAll (string hash, string value); IQueryable GetAll (string hash, string value, Expression > filter); long PublishMessage(string channel, object item); void Set (T item); void Set (T item, List hash, List value, string keyName); void Set (T item, string hash, string value, string keyName); void SetAll (List listItems); void SetAll (List list, List hash, List value, string keyName); void SetAll (List list, string hash, string value, string keyName);}
接口有了,接下来就是继承自接口的类,我们定义一个类来实现接口里的方法,例如:
using ServiceStack.Redis;namespace Microsoft.Extensions.Caching.Redis{ public class ServiceStackRedisCache : IServiceStackRedisCache { private readonly IRedisClientsManager _redisManager; private readonly ServiceStackRedisCacheOptions _options; public ServiceStackRedisCache(IOptionsoptionsAccessor) { if (optionsAccessor == null) { throw new ArgumentNullException(nameof(optionsAccessor)); } _options = optionsAccessor.Value; var host = $"{_options.Password}@{_options.Host}:{_options.Port}"; RedisConfig.VerifyMasterConnections = false; _redisManager = new RedisManagerPool(host); } #region Base public byte[] Get(string key) { if (key == null) { throw new ArgumentNullException(nameof(key)); } using (var client = _redisManager.GetClient() as IRedisNativeClient) { if (client.Exists(key) == 1) { return client.Get(key); } } return null; } public async Task GetAsync(string key) { return Get(key); } public void Set(string key, byte[] value, DistributedCacheEntryOptions options) { if (key == null) { throw new ArgumentNullException(nameof(key)); } if (value == null) { throw new ArgumentNullException(nameof(value)); } if (options == null) { throw new ArgumentNullException(nameof(options)); } using (var client = _redisManager.GetClient() as IRedisNativeClient) { var expireInSeconds = GetExpireInSeconds(options); if (expireInSeconds > 0) { client.SetEx(key, expireInSeconds, value); client.SetEx(GetExpirationKey(key), expireInSeconds, Encoding.UTF8.GetBytes(expireInSeconds.ToString())); } else { client.Set(key, value); } } } public async Task SetAsync(string key, byte[] value, DistributedCacheEntryOptions options) { Set(key, value, options); } public void Refresh(string key) { if (key == null) { throw new ArgumentNullException(nameof(key)); } using (var client = _redisManager.GetClient() as IRedisNativeClient) { if (client.Exists(key) == 1) { var value = client.Get(key); if (value != null) { var expirationValue = client.Get(GetExpirationKey(key)); if (expirationValue != null) { client.Expire(key, int.Parse(Encoding.UTF8.GetString(expirationValue))); } } } } } public async Task RefreshAsync(string key) { if (key == null) { throw new ArgumentNullException(nameof(key)); } Refresh(key); } public void Remove(string key) { if (key == null) { throw new ArgumentNullException(nameof(key)); } using (var client = _redisManager.GetClient() as IRedisNativeClient) { client.Del(key); } } public async Task RemoveAsync(string key) { Remove(key); } private int GetExpireInSeconds(DistributedCacheEntryOptions options) { if (options.SlidingExpiration.HasValue) { return (int)options.SlidingExpiration.Value.TotalSeconds; } else if (options.AbsoluteExpiration.HasValue) { return (int)options.AbsoluteExpirationRelativeToNow.Value.TotalSeconds; } else { return 0; } } private string GetExpirationKey(string key) { return key + $"-{nameof(DistributedCacheEntryOptions)}"; } #endregion #region data public T Get (string id) { using (var redisClient = _redisManager.GetClient()) { var redis = redisClient.As (); return redis.GetById(id.ToLower()); } } public IQueryable GetAll () { using (var redisClient = _redisManager.GetClient()) { var redis = redisClient.As (); return redis.GetAll().AsQueryable(); } } public IQueryable GetAll (string hash, string value, Expression > filter) { var filtered = _redisManager.GetClient().GetAllEntriesFromHash(hash).Where(c => c.Value.Equals(value, StringComparison.CurrentCultureIgnoreCase)); var ids = filtered.Select(c => c.Key); var ret = _redisManager.GetClient().As ().GetByIds(ids).AsQueryable() .Where(filter); return ret; } public IQueryable GetAll (string hash, string value) { var filtered = _redisManager.GetClient().GetAllEntriesFromHash(hash).Where(c => c.Value.Equals(value, StringComparison.CurrentCultureIgnoreCase)); var ids = filtered.Select(c => c.Key); var ret = _redisManager.GetClient().As ().GetByIds(ids).AsQueryable(); return ret; } public void Set (T item) { using (var redisClient = _redisManager.GetClient()) { var redis = redisClient.As (); redis.Store(item); } } public void Set (T item, string hash, string value, string keyName) { Type t = item.GetType(); PropertyInfo prop = t.GetProperty(keyName); _redisManager.GetClient().SetEntryInHash(hash, prop.GetValue(item).ToString(), value.ToLower()); _redisManager.GetClient().As ().Store(item); } public void Set (T item, List hash, List value, string keyName) { Type t = item.GetType(); PropertyInfo prop = t.GetProperty(keyName); for (int i = 0; i ().Store(item); } public void SetAll (List listItems) { using (var redisClient = _redisManager.GetClient()) { var redis = redisClient.As (); redis.StoreAll(listItems); } } public void SetAll (List list, string hash, string value, string keyName) { foreach (var item in list) { Type t = item.GetType(); PropertyInfo prop = t.GetProperty(keyName); _redisManager.GetClient().SetEntryInHash(hash, prop.GetValue(item).ToString(), value.ToLower()); _redisManager.GetClient().As ().StoreAll(list); } } public void SetAll (List list, List hash, List value, string keyName) { foreach (var item in list) { Type t = item.GetType(); PropertyInfo prop = t.GetProperty(keyName); for (int i = 0; i ().StoreAll(list); } } public void Delete (T item) { using (var redisClient = _redisManager.GetClient()) { var redis = redisClient.As (); redis.Delete(item); } } public void DeleteAll (T item) { using (var redisClient = _redisManager.GetClient()) { var redis = redisClient.As (); redis.DeleteAll(); } } public long PublishMessage(string channel, object item) { var ret = _redisManager.GetClient().PublishMessage(channel, JsonConvert.SerializeObject(item)); return ret; } #endregion }}
在这里我们使用ServiceStack来作为底层redis驱动。在构造函数中根据配置连接redis服务器。
aps.net-core给我们提供了强大的配置功能,使用强类型的Options,一般,我们实现一个继承自IOptions
然后我们在redis客户端类中(也就是上面的ServiceStackRedisCache类),使用构造函数注入。这样就能获取到redis的配置了。
然后我们在控制器的构造函数中注入redis客户端类实例:
private readonly IServiceStackRedisCache _cache;public ValuesController(IServiceStackRedisCache cache){ _cache = cache;}
如此,我们才能使用redis客户端去操作redis服务器。
最后就是最重要的部分了。ASP.NET-CORE框架随处可见的都是依赖注入。上面所有的程序,都是一个接口对应着一个类。所谓的依赖注入,其实就是继承自接口的类的实例化过程,但是这个过程是解耦的!DI的作用主要就是用来解耦实例化的过程。
ASP.NET-CORE框架依赖注入部分是在ConfigureService中使用的。
从上面的过程中,我们看到有两个构造函数的注入过程,因此,我们需要实现两个DI,分别是配置类的DI和redis客户端类的DI。
services.Configure(setupAction);services.Add(ServiceDescriptor.Singleton());
整个步骤就是:
1.定义接口,用于继承IDistributedCache的接口。该接口主要封装了基本的redis操作。
2.实现接口,实现redis的各个逻辑。
3.基于IOptions
4.在控制器的构造函数中注入。
5.依赖注入以上接口的实例。
完整demo下载: 链接:https://pan.baidu.com/s/17g3JQxdSBGJS2YoEaBxItw 密码:h60e
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