ICacheClient for ServiceStack using StackExchange.Redis

RedisCacheClient.cs

using System;
using System.Collections.Generic;
using ServiceStack.Caching;
using StackExchange.Redis;
using ServiceStack.Text;
using System.Linq;

namespace Shared.ServiceInterface
{
    public class RedisCacheClient : ICacheClient, IRemoveByPattern
    {
        private readonly ConnectionMultiplexer conn;

        public RedisCacheClient(ConnectionMultiplexer conn)
        {
            this.conn = conn;
        }

        #region IRemoveByPattern
        // If we need either of these, see 
        // https://github.com/StackExchange/StackExchange.Redis/blob/a816651d6d2dce55f07c4c620654e3e38646a14c/Docs/KeysScan.md

        public void RemoveByPattern(string pattern)
        {
            throw new NotImplementedException();
        }

        public void RemoveByRegex(string pattern)
        {
            throw new NotImplementedException();
        }

        #endregion

        #region ICacheClient
        public bool Add<T>(string key, T value, DateTime expiresAt)
        {
            TimeSpan expiresIn = (expiresAt.Kind == DateTimeKind.Utc ? expiresAt - DateTime.UtcNow : expiresAt - DateTime.Now);

            return conn.GetDatabase().StringSet(key, TypeSerializer.SerializeToString<T>(value), expiresIn, When.NotExists);
        }

        public bool Add<T>(string key, T value, TimeSpan expiresIn)
        {
            return conn.GetDatabase().StringSet(key, TypeSerializer.SerializeToString<T>(value), expiresIn, When.NotExists);
        }

        public bool Add<T>(string key, T value)
        {
            return conn.GetDatabase().StringSet(key, TypeSerializer.SerializeToString<T>(value), when: When.NotExists);
        }

        public long Decrement(string key, uint amount)
        {
            return conn.GetDatabase().StringDecrement(key, (long)amount);
        }

        public void FlushAll()
        {
            throw new NotImplementedException();
        }

        public T Get<T>(string key)
        {
            return TypeSerializer.DeserializeFromString<T>(conn.GetDatabase().StringGet(key));
        }

        public IDictionary<string, T> GetAll<T>(IEnumerable<string> keys)
        {
            return conn.GetDatabase().StringGet(keys.OfType<RedisKey>().ToArray())
                .Zip(keys, (k, v) => new Tuple<string, T>(k, TypeSerializer.DeserializeFromString<T>((string)v))).ToDictionary(i => i.Item1, i => i.Item2);
        }

        public long Increment(string key, uint amount)
        {
            return conn.GetDatabase().StringIncrement(key, (long)amount);
        }

        public bool Remove(string key)
        {
            return conn.GetDatabase().KeyDelete(key);
        }

        public void RemoveAll(IEnumerable<string> keys)
        {
            conn.GetDatabase().KeyDelete(keys.OfType<RedisKey>().ToArray());
        }

        public bool Replace<T>(string key, T value, DateTime expiresAt)
        {
            TimeSpan expiresIn = (expiresAt.Kind == DateTimeKind.Utc ? expiresAt - DateTime.UtcNow : expiresAt - DateTime.Now);

            return conn.GetDatabase().StringSet(key, TypeSerializer.SerializeToString<T>(value), expiresIn, When.Exists);
        }

        public bool Replace<T>(string key, T value)
        {
            return conn.GetDatabase().StringSet(key, TypeSerializer.SerializeToString<T>(value), when: When.Exists);
        }

        public bool Replace<T>(string key, T value, TimeSpan expiresIn)
        {
            return conn.GetDatabase().StringSet(key, TypeSerializer.SerializeToString<T>(value), expiresIn, When.Exists);
        }

        public bool Set<T>(string key, T value)
        {
            return conn.GetDatabase().StringSet(key, TypeSerializer.SerializeToString<T>(value), when: When.Always);
        }

        public bool Set<T>(string key, T value, TimeSpan expiresIn)
        {
            return conn.GetDatabase().StringSet(key, TypeSerializer.SerializeToString<T>(value), expiresIn, When.Always);
        }

        public bool Set<T>(string key, T value, DateTime expiresAt)
        {
            TimeSpan expiresIn = (expiresAt.Kind == DateTimeKind.Utc ? expiresAt - DateTime.UtcNow : expiresAt - DateTime.Now);

            return conn.GetDatabase().StringSet(key, TypeSerializer.SerializeToString<T>(value), expiresIn, When.Always);
        }

        public void SetAll<T>(IDictionary<string, T> values)
        {
            conn.GetDatabase().StringSet(
                values.Select(p => new KeyValuePair<RedisKey, RedisValue>((RedisKey)p.Key, (RedisValue)TypeSerializer.SerializeToString<T>(p.Value))).ToArray(),
                When.Always);
        }

        #endregion

        #region IDisposable
        public void Dispose() 
        {
            // Nothing to dispose
        }

        #endregion
    }
}