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AbpRedisCache.cs
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AbpRedisCache.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.Extensions.Caching.Distributed;
using Microsoft.Extensions.Caching.StackExchangeRedis;
using Microsoft.Extensions.Options;
using StackExchange.Redis;
using Volo.Abp.DependencyInjection;
namespace Volo.Abp.Caching.StackExchangeRedis
{
[DisableConventionalRegistration]
public class AbpRedisCache : RedisCache, ICacheSupportsMultipleItems
{
protected static readonly string SetScript;
protected static readonly string AbsoluteExpirationKey;
protected static readonly string SlidingExpirationKey;
protected static readonly string DataKey;
protected static readonly long NotPresent;
private static readonly FieldInfo RedisDatabaseField;
private static readonly MethodInfo ConnectMethod;
private static readonly MethodInfo ConnectAsyncMethod;
private static readonly MethodInfo MapMetadataMethod;
private static readonly MethodInfo GetAbsoluteExpirationMethod;
private static readonly MethodInfo GetExpirationInSecondsMethod;
protected IDatabase RedisDatabase => GetRedisDatabase();
private IDatabase _redisDatabase;
protected string Instance { get; }
static AbpRedisCache()
{
var type = typeof(RedisCache);
RedisDatabaseField = type.GetField("_cache", BindingFlags.Instance | BindingFlags.NonPublic);
ConnectMethod = type.GetMethod("Connect", BindingFlags.Instance | BindingFlags.NonPublic);
ConnectAsyncMethod = type.GetMethod("ConnectAsync", BindingFlags.Instance | BindingFlags.NonPublic);
MapMetadataMethod = type.GetMethod("MapMetadata", BindingFlags.Instance | BindingFlags.NonPublic);
GetAbsoluteExpirationMethod =
type.GetMethod("GetAbsoluteExpiration", BindingFlags.Static | BindingFlags.NonPublic);
GetExpirationInSecondsMethod =
type.GetMethod("GetExpirationInSeconds", BindingFlags.Static | BindingFlags.NonPublic);
SetScript = type.GetField("SetScript", BindingFlags.Static | BindingFlags.NonPublic)?.GetValue(null)
.ToString();
AbsoluteExpirationKey = type.GetField("AbsoluteExpirationKey", BindingFlags.Static | BindingFlags.NonPublic)
?.GetValue(null).ToString();
SlidingExpirationKey = type.GetField("SlidingExpirationKey", BindingFlags.Static | BindingFlags.NonPublic)
?.GetValue(null).ToString();
DataKey = type.GetField("DataKey", BindingFlags.Static | BindingFlags.NonPublic)?.GetValue(null).ToString();
// ReSharper disable once PossibleNullReferenceException
NotPresent = type.GetField("NotPresent", BindingFlags.Static | BindingFlags.NonPublic).GetValue(null)
.To<int>();
}
public AbpRedisCache(IOptions<RedisCacheOptions> optionsAccessor)
: base(optionsAccessor)
{
Instance = optionsAccessor.Value.InstanceName ?? string.Empty;
}
protected virtual void Connect()
{
if (GetRedisDatabase() != null)
{
return;
}
ConnectMethod.Invoke(this, Array.Empty<object>());
}
protected virtual Task ConnectAsync(CancellationToken token = default)
{
if (GetRedisDatabase() != null)
{
return Task.CompletedTask;
}
return (Task) ConnectAsyncMethod.Invoke(this, new object[] {token});
}
public byte[][] GetMany(
IEnumerable<string> keys)
{
keys = Check.NotNull(keys, nameof(keys));
return GetAndRefreshMany(keys, true);
}
public async Task<byte[][]> GetManyAsync(
IEnumerable<string> keys,
CancellationToken token = default)
{
keys = Check.NotNull(keys, nameof(keys));
return await GetAndRefreshManyAsync(keys, true, token);
}
public void SetMany(
IEnumerable<KeyValuePair<string, byte[]>> items,
DistributedCacheEntryOptions options)
{
Connect();
Task.WaitAll(PipelineSetMany(items, options));
}
public async Task SetManyAsync(
IEnumerable<KeyValuePair<string, byte[]>> items,
DistributedCacheEntryOptions options,
CancellationToken token = default)
{
token.ThrowIfCancellationRequested();
await ConnectAsync(token);
await Task.WhenAll(PipelineSetMany(items, options));
}
public void RefreshMany(
IEnumerable<string> keys)
{
keys = Check.NotNull(keys, nameof(keys));
GetAndRefreshMany(keys, false);
}
public async Task RefreshManyAsync(
IEnumerable<string> keys,
CancellationToken token = default)
{
keys = Check.NotNull(keys, nameof(keys));
await GetAndRefreshManyAsync(keys, false, token);
}
public void RemoveMany(IEnumerable<string> keys)
{
keys = Check.NotNull(keys, nameof(keys));
Connect();
RedisDatabase.KeyDelete(keys.Select(key => (RedisKey)(Instance + key)).ToArray());
}
public async Task RemoveManyAsync(IEnumerable<string> keys, CancellationToken token = default)
{
keys = Check.NotNull(keys, nameof(keys));
token.ThrowIfCancellationRequested();
await ConnectAsync(token);
await RedisDatabase.KeyDeleteAsync(keys.Select(key => (RedisKey)(Instance + key)).ToArray());
}
protected virtual byte[][] GetAndRefreshMany(
IEnumerable<string> keys,
bool getData)
{
Connect();
var keyArray = keys.Select(key => Instance + key).ToArray();
RedisValue[][] results;
if (getData)
{
results = RedisDatabase.HashMemberGetMany(keyArray, AbsoluteExpirationKey,
SlidingExpirationKey, DataKey);
}
else
{
results = RedisDatabase.HashMemberGetMany(keyArray, AbsoluteExpirationKey,
SlidingExpirationKey);
}
Task.WaitAll(PipelineRefreshManyAndOutData(keyArray, results, out var bytes));
return bytes;
}
protected virtual async Task<byte[][]> GetAndRefreshManyAsync(
IEnumerable<string> keys,
bool getData,
CancellationToken token = default)
{
token.ThrowIfCancellationRequested();
await ConnectAsync(token);
var keyArray = keys.Select(key => Instance + key).ToArray();
RedisValue[][] results;
if (getData)
{
results = await RedisDatabase.HashMemberGetManyAsync(keyArray, AbsoluteExpirationKey,
SlidingExpirationKey, DataKey);
}
else
{
results = await RedisDatabase.HashMemberGetManyAsync(keyArray, AbsoluteExpirationKey,
SlidingExpirationKey);
}
await Task.WhenAll(PipelineRefreshManyAndOutData(keyArray, results, out var bytes));
return bytes;
}
protected virtual Task[] PipelineRefreshManyAndOutData(
string[] keys,
RedisValue[][] results,
out byte[][] bytes)
{
bytes = new byte[keys.Length][];
var tasks = new Task[keys.Length];
for (var i = 0; i < keys.Length; i++)
{
if (results[i].Length >= 2)
{
MapMetadata(results[i], out DateTimeOffset? absExpr, out TimeSpan? sldExpr);
if (sldExpr.HasValue)
{
TimeSpan? expr;
if (absExpr.HasValue)
{
var relExpr = absExpr.Value - DateTimeOffset.Now;
expr = relExpr <= sldExpr.Value ? relExpr : sldExpr;
}
else
{
expr = sldExpr;
}
tasks[i] = RedisDatabase.KeyExpireAsync(keys[i], expr);
}
else
{
tasks[i] = Task.CompletedTask;
}
}
if (results[i].Length >= 3 && results[i][2].HasValue)
{
bytes[i] = results[i][2];
}
else
{
bytes[i] = null;
}
}
return tasks;
}
protected virtual Task[] PipelineSetMany(
IEnumerable<KeyValuePair<string, byte[]>> items,
DistributedCacheEntryOptions options)
{
items = Check.NotNull(items, nameof(items));
options = Check.NotNull(options, nameof(options));
var itemArray = items.ToArray();
var tasks = new Task[itemArray.Length];
var creationTime = DateTimeOffset.UtcNow;
var absoluteExpiration = GetAbsoluteExpiration(creationTime, options);
for (var i = 0; i < itemArray.Length; i++)
{
tasks[i] = RedisDatabase.ScriptEvaluateAsync(SetScript, new RedisKey[] {Instance + itemArray[i].Key},
new RedisValue[]
{
absoluteExpiration?.Ticks ?? NotPresent,
options.SlidingExpiration?.Ticks ?? NotPresent,
GetExpirationInSeconds(creationTime, absoluteExpiration, options) ?? NotPresent,
itemArray[i].Value
});
}
return tasks;
}
protected virtual void MapMetadata(
RedisValue[] results,
out DateTimeOffset? absoluteExpiration,
out TimeSpan? slidingExpiration)
{
var parameters = new object[] {results, null, null};
MapMetadataMethod.Invoke(this, parameters);
absoluteExpiration = (DateTimeOffset?) parameters[1];
slidingExpiration = (TimeSpan?) parameters[2];
}
protected virtual long? GetExpirationInSeconds(
DateTimeOffset creationTime,
DateTimeOffset? absoluteExpiration,
DistributedCacheEntryOptions options)
{
return (long?) GetExpirationInSecondsMethod.Invoke(null,
new object[] {creationTime, absoluteExpiration, options});
}
protected virtual DateTimeOffset? GetAbsoluteExpiration(
DateTimeOffset creationTime,
DistributedCacheEntryOptions options)
{
return (DateTimeOffset?) GetAbsoluteExpirationMethod.Invoke(null, new object[] {creationTime, options});
}
private IDatabase GetRedisDatabase()
{
if (_redisDatabase == null)
{
_redisDatabase = RedisDatabaseField.GetValue(this) as IDatabase;
}
return _redisDatabase;
}
}
}