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/*
* Copyright (c) 2023 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Plugins.Extensions.VNCache
* File: RemoteBackedMemoryCache.cs
*
* RemoteBackedMemoryCache.cs is part of VNLib.Plugins.Extensions.VNCache
* which is part of the larger VNLib collection of libraries and utilities.
*
* VNLib.Plugins.Extensions.VNCache is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* VNLib.Plugins.Extensions.VNCache is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see https://www.gnu.org/licenses/.
*/
using System;
using System.Text.Json;
using System.Threading;
using System.Threading.Tasks;
using VNLib.Utils;
using VNLib.Utils.Memory;
using VNLib.Utils.Logging;
using VNLib.Utils.Memory.Diagnostics;
using VNLib.Data.Caching;
using VNLib.Data.Caching.ObjectCache;
using VNLib.Plugins.Extensions.Loading;
namespace VNLib.Plugins.Extensions.VNCache
{
[ConfigurationName(VNCacheExtensions.CACHE_CONFIG_KEY)]
internal sealed class MemoryCache : VnDisposeable, IGlobalCacheProvider
{
const int MB_DIVISOR = 1000 * 1024;
const string DEBUG_TEMPLATE =@"Configuring Memory-Only Cache
| -----------------------------
| Configuration:
| Table Size: {ts}
| Bucket Size: {bs}
| Max Objects: {obj}
| Memory Estimations:
| 4K blocks: {4k}Mb
| 8K blocks: {8k}Mb
| 16K blocks: {16K}Mb
| -----------------------------
";
private readonly ICacheObjectSerialzer _serialzer;
private readonly ICacheObjectDeserialzer _deserialzer;
private readonly IBlobCacheTable _memCache;
private readonly IUnmangedHeap _bufferHeap;
public MemoryCache(PluginBase pbase, IConfigScope config)
{
//Get nested memory cache config
MemoryCacheConfig memCacheConfig = config[VNCacheExtensions.MEMORY_CACHE_CONFIG_KEY].Deserialize<MemoryCacheConfig>()!;
if (pbase.IsDebug())
{
//Use the debug heap
IUnmangedHeap newHeap = MemoryUtil.InitializeNewHeapForProcess();
//Wrap in diag heap
_bufferHeap = new TrackedHeapWrapper(newHeap);
}
else
{
//Init new "private" heap to alloc buffer from
_bufferHeap = MemoryUtil.InitializeNewHeapForProcess();
}
//Setup cache table
_memCache = new BlobCacheTable(memCacheConfig.TableSize, memCacheConfig.BucketSize, _bufferHeap, null);
/*
* Default to json serialization by using the default
* serializer and JSON options
*/
JsonCacheObjectSerializer defaultSerializer = new();
_serialzer = defaultSerializer;
_deserialzer = defaultSerializer;
PrintDebug(pbase.Log, memCacheConfig);
}
private static void PrintDebug(ILogProvider log, MemoryCacheConfig config)
{
long maxObjects = config.BucketSize * config.TableSize;
long size4kMb = (maxObjects * 4096)/MB_DIVISOR;
long size8kMb = (maxObjects * 8128)/MB_DIVISOR;
long size16kMb = (maxObjects * 16384)/MB_DIVISOR;
log.Debug(DEBUG_TEMPLATE, config.TableSize, config.BucketSize, maxObjects, size4kMb, size8kMb, size16kMb);
}
///<inheritdoc/>
public bool IsConnected { get; } = true;
protected override void Free()
{
_memCache.Dispose();
_bufferHeap.Dispose();
}
///<inheritdoc/>
public Task AddOrUpdateAsync<T>(string key, string? newKey, T value, CancellationToken cancellation)
{
return AddOrUpdateAsync(key, newKey, value, _serialzer, cancellation);
}
///<inheritdoc/>
public async Task AddOrUpdateAsync<T>(string key, string? newKey, T value, ICacheObjectSerialzer serialzer, CancellationToken cancellation)
{
Check();
//Alloc serialzation buffer
using AddOrUpdateBuffer buffer = new (_bufferHeap);
//Serialze the value
serialzer.Serialize(value, buffer);
//Update object data
await _memCache.AddOrUpdateObjectAsync(key, newKey, static b => b.GetData(), buffer, default, cancellation);
}
///<inheritdoc/>
public Task DeleteAsync(string key, CancellationToken cancellation)
{
Check();
return _memCache.DeleteObjectAsync(key, cancellation).AsTask();
}
///<inheritdoc/>
public Task<T?> GetAsync<T>(string key, CancellationToken cancellation) => GetAsync<T>(key, _deserialzer, cancellation);
///<inheritdoc/>
public async Task<T?> GetAsync<T>(string key, ICacheObjectDeserialzer deserializer, CancellationToken cancellation)
{
Check();
IBlobCacheBucket bucket = _memCache.GetBucket(key);
//Obtain cache handle
using (CacheBucketHandle handle = await bucket.WaitAsync(cancellation))
{
//Try to read the value
if (handle.Cache.TryGetValue(key, out CacheEntry entry))
{
return (T?)deserializer.Deserialze(typeof(T), entry.GetDataSegment());
}
}
return default;
}
}
}
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