DocSpace-buildtools/common/ASC.Common/Caching/AscCache.cs

/*
 *
 * (c) Copyright Ascensio System Limited 2010-2018
 *
 * This program is freeware. You can redistribute it and/or modify it under the terms of the GNU 
 * General Public License (GPL) version 3 as published by the Free Software Foundation (https://www.gnu.org/copyleft/gpl.html). 
 * In accordance with Section 7(a) of the GNU GPL its Section 15 shall be amended to the effect that 
 * Ascensio System SIA expressly excludes the warranty of non-infringement of any third-party rights.
 *
 * THIS PROGRAM IS DISTRIBUTED WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY OR
 * FITNESS FOR A PARTICULAR PURPOSE. For more details, see GNU GPL at https://www.gnu.org/copyleft/gpl.html
 *
 * You can contact Ascensio System SIA by email at sales@onlyoffice.com
 *
 * The interactive user interfaces in modified source and object code versions of ONLYOFFICE must display 
 * Appropriate Legal Notices, as required under Section 5 of the GNU GPL version 3.
 *
 * Pursuant to Section 7 § 3(b) of the GNU GPL you must retain the original ONLYOFFICE logo which contains 
 * relevant author attributions when distributing the software. If the display of the logo in its graphic 
 * form is not reasonably feasible for technical reasons, you must include the words "Powered by ONLYOFFICE" 
 * in every copy of the program you distribute. 
 * Pursuant to Section 7 § 3(e) we decline to grant you any rights under trademark law for use of our trademarks.
 *
*/


using System;
using System.Collections.Concurrent;
using System.Linq;
using System.Runtime.Caching;
using System.Text.RegularExpressions;

using Microsoft.Extensions.Caching.Memory;

namespace ASC.Common.Caching
{
    [Singletone]
    public class AscCacheNotify
    {
        private readonly IEventBus<AscCacheItem> _eventBus;

        public AscCacheNotify(IEventBus<AscCacheItem> eventBus)
        {
            _eventBus = eventBus;

            _eventBus.Subscribe((item) => { OnClearCache(); }, EventType.Any);
        }

        public void ClearCache() => _eventBus.Publish(new AscCacheItem { Id = Guid.NewGuid().ToString() }, EventType.Any);

        public static void OnClearCache()
        {
            var keys = MemoryCache.Default.Select(r => r.Key).ToList();

            foreach (var k in keys)
            {
                MemoryCache.Default.Remove(k);
            }
        }
    }

    [Singletone]
    public class AscCache : ICache
    {
        private readonly IMemoryCache _memoryCache;
        private readonly ConcurrentDictionary<string, object> _memoryCacheKeys;

        public AscCache(IMemoryCache memoryCache)
        {
            _memoryCache = memoryCache;
            _memoryCacheKeys = new ConcurrentDictionary<string, object>();
        }

        public T Get<T>(string key) where T : class => _memoryCache.Get<T>(key);

        public void Insert(string key, object value, TimeSpan sligingExpiration)
        {
            var options = new MemoryCacheEntryOptions()
                .SetSlidingExpiration(sligingExpiration)
                .RegisterPostEvictionCallback(EvictionCallback);

            _memoryCache.Set(key, value, options);
            _memoryCacheKeys.TryAdd(key, null);
        }

        public void Insert(string key, object value, DateTime absolutExpiration)
        {
            var options = new MemoryCacheEntryOptions()
                .SetAbsoluteExpiration(absolutExpiration == DateTime.MaxValue ? DateTimeOffset.MaxValue : new DateTimeOffset(absolutExpiration))
                .RegisterPostEvictionCallback(EvictionCallback);

            _memoryCache.Set(key, value, options);
            _memoryCacheKeys.TryAdd(key, null);
        }

        public void Remove(string key) => _memoryCache.Remove(key);

        public void Remove(Regex pattern)
        {
            var copy = _memoryCacheKeys.ToDictionary(p => p.Key, p => p.Value);
            var keys = copy.Select(p => p.Key).Where(k => pattern.IsMatch(k)).ToArray();

            foreach (var key in keys)
            {
                _memoryCache.Remove(key);
            }
        }

        public ConcurrentDictionary<string, T> HashGetAll<T>(string key) => 
            _memoryCache.GetOrCreate(key, r => new ConcurrentDictionary<string, T>());

        public T HashGet<T>(string key, string field)
        {
            if (_memoryCache.TryGetValue<ConcurrentDictionary<string, T>>(key, out var dic) 
                && dic.TryGetValue(field, out var value))
                return value;

            return default;
        }

        public void HashSet<T>(string key, string field, T value)
        {
            var dic = HashGetAll<T>(key);
            if (value != null)
            {
                dic.AddOrUpdate(field, value, (k, v) => value);
                _memoryCache.Set(key, dic, DateTime.MaxValue);
            }
            else if (dic != null)
            {
                dic.TryRemove(field, out _);

                if (dic.IsEmpty) _memoryCache.Remove(key);

                else _memoryCache.Set(key, dic, DateTime.MaxValue);
            }
        }

        private void EvictionCallback(object key, object value, EvictionReason reason, object state) =>
            _memoryCacheKeys.TryRemove(key.ToString(), out _);
    }
}