asp.net core 上使用redis探索(3)--redis示例demo
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 DeleteT>
(T item);
// 删除
void DeleteAllT>
(T item);
T GetT>
(string id);
IQueryableT>
GetAllT>
();
IQueryableT>
GetAllT>
(string hash, string value);
IQueryableT>
GetAllT>
(string hash, string value, ExpressionFuncT, bool>
>
filter);
long PublishMessage(string channel, object item);
void SetT>
(T item);
void SetT>
(T item, Liststring>
hash, Liststring>
value, string keyName);
void SetT>
(T item, string hash, string value, string keyName);
void SetAllT>
(ListT>
listItems);
void SetAllT>
(ListT>
list, Liststring>
hash, Liststring>
value, string keyName);
void SetAllT>
(ListT>
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(IOptionsServiceStackRedisCacheOptions>
optionsAccessor)
{
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 Taskbyte[]>
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 GetT>
(string id)
{
using (var redisClient = _redisManager.GetClient())
{
var redis = redisClient.AsT>
();
return redis.GetById(id.ToLower());
}
}
public IQueryableT>
GetAllT>
()
{
using (var redisClient = _redisManager.GetClient())
{
var redis = redisClient.AsT>
();
return redis.GetAll().AsQueryable();
}
}
public IQueryableT>
GetAllT>
(string hash, string value, ExpressionFuncT, bool>
>
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().AsT>
().GetByIds(ids).AsQueryable()
.Where(filter);
return ret;
}
public IQueryableT>
GetAllT>
(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().AsT>
().GetByIds(ids).AsQueryable();
return ret;
}
public void SetT>
(T item)
{
using (var redisClient = _redisManager.GetClient())
{
var redis = redisClient.AsT>
();
redis.Store(item);
}
}
public void SetT>
(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().AsT>
().Store(item);
}
public void SetT>
(T item, Liststring>
hash, Liststring>
value, string keyName)
{
Type t = item.GetType();
PropertyInfo prop = t.GetProperty(keyName);
for (int i = 0;
i hash.Count;
i++)
{
_redisManager.GetClient().SetEntryInHash(hash[i], prop.GetValue(item).ToString(), value[i].ToLower());
}
_redisManager.GetClient().AsT>
().Store(item);
}
public void SetAllT>
(ListT>
listItems)
{
using (var redisClient = _redisManager.GetClient())
{
var redis = redisClient.AsT>
();
redis.StoreAll(listItems);
}
}
public void SetAllT>
(ListT>
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().AsT>
().StoreAll(list);
}
}
public void SetAllT>
(ListT>
list, Liststring>
hash, Liststring>
value, string keyName)
{
foreach (var item in list)
{
Type t = item.GetType();
PropertyInfo prop = t.GetProperty(keyName);
for (int i = 0;
i hash.Count;
i++)
{
_redisManager.GetClient().SetEntryInHash(hash[i], prop.GetValue(item).ToString(), value[i].ToLower());
}
_redisManager.GetClient().AsT>
().StoreAll(list);
}
}
public void DeleteT>
(T item)
{
using (var redisClient = _redisManager.GetClient())
{
var redis = redisClient.AsT>
();
redis.Delete(item);
}
}
public void DeleteAllT>
(T item)
{
using (var redisClient = _redisManager.GetClient())
{
var redis = redisClient.AsT>
();
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IOptionsTOptions> 的类。定义一些字段用来表示主机,端口等常规redis配置选项。由于IOptions接口定义了一个Value属性,我们可以通过这个属性来获取配置类的实例。 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.SingletonIServiceStackRedisCache, ServiceStackRedisCache>
());
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IOptionsTOptions> 接口实现redis的常规配置。 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/17w0c0y9_VF3TzvgilgazjQ 密码:4u5e
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