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/*
* Copyright (c) 2024 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Data.Caching.Providers.VNCache
* File: MemoryCache.cs
*
* MemoryCache.cs is part of VNLib.Data.Caching.Providers.VNCache
* which is part of the larger VNLib collection of libraries and utilities.
*
* VNLib.Data.Caching.Providers.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.Data.Caching.Providers.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.Memory;
using VNLib.Utils.Logging;
using VNLib.Utils.Memory.Diagnostics;
using VNLib.Data.Caching;
using VNLib.Data.Caching.ObjectCache;
using VNLib.Plugins;
using VNLib.Plugins.Extensions.Loading;
namespace VNLib.Data.Caching.Providers.VNCache
{
[ConfigurationName(VNCacheClient.CACHE_CONFIG_KEY)]
internal sealed class MemoryCache : VNCacheBase, IDisposable
{
const int MB_DIVISOR = 1000 * 1024;
const string DEBUG_TEMPLATE =@"Configuring Memory-Only Cache
| -----------------------------
| Configuration:
| Table Size: {ts}
| Bucket Size: {bs}
| Max Objects: {obj}
| Max Memory Estimations:
| 4K blocks: {4k}Mb
| 8K blocks: {8k}Mb
| 16K blocks: {16K}Mb
| -----------------------------
";
private readonly IBlobCacheTable _memCache;
private readonly IUnmangedHeap _bufferHeap;
private readonly BucketLocalManagerFactory? _blobCacheMemManager;
public MemoryCache(PluginBase pbase, IConfigScope config)
: this(
config[VNCacheClient.MEMORY_CACHE_CONFIG_KEY].Deserialize<MemoryCacheConfig>()!,
pbase.IsDebug(),
pbase.Log,
pbase.GetOrCreateSingleton<BucketLocalManagerFactory>()
)
{ }
public MemoryCache(MemoryCacheConfig config) : this(config, false, null, null)
{ }
private MemoryCache(MemoryCacheConfig config, bool isDebug, ILogProvider? log, BucketLocalManagerFactory? factory) : base(config)
{
//Validate config
config.Validate();
if (isDebug)
{
//Use the debug heap
IUnmangedHeap newHeap = MemoryUtil.InitializeNewHeapForProcess();
//Wrap in diag heap
_bufferHeap = new TrackedHeapWrapper(newHeap, true);
}
else
{
//Init new "private" heap to alloc buffer from
_bufferHeap = MemoryUtil.InitializeNewHeapForProcess();
}
//Fallback to creating a local/single instance of the manager
factory ??= _blobCacheMemManager = BucketLocalManagerFactory.Create(config.ZeroAllAllocations);
//Setup cache table
_memCache = new BlobCacheTable(config.TableSize, config.BucketSize, factory, null);
PrintDebug(log, config);
}
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);
}
public void Dispose()
{
_memCache.Dispose();
_bufferHeap.Dispose();
_blobCacheMemManager?.Dispose();
}
///<inheritdoc/>
public override object GetUnderlyingStore() => _memCache;
///<inheritdoc/>
public override bool IsConnected { get; } = true;
///<inheritdoc/>
public override async Task AddOrUpdateAsync<T>(string key, string? newKey, T value, ICacheObjectSerializer serialzer, CancellationToken cancellation)
{
//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 override Task<bool> DeleteAsync(string key, CancellationToken cancellation)
{
return _memCache.DeleteObjectAsync(key, cancellation).AsTask();
}
///<inheritdoc/>
public override async Task<T> GetAsync<T>(string key, ICacheObjectDeserializer deserializer, CancellationToken cancellation)
{
IBlobCacheBucket bucket = _memCache.GetBucket(key);
//Obtain lock
IBlobCache cache = await bucket.ManualWaitAsync(cancellation);
try
{
//Try to read the value
if (cache.TryGetValue(key, out CacheEntry entry))
{
return deserializer.Deserialize<T>(entry.GetDataSegment())!;
}
return default!;
}
finally
{
bucket.Release();
}
}
///<inheritdoc/>
public override async Task GetAsync<T>(string key, ObjectDataSet<T> callback, T state, CancellationToken cancellation)
{
//Get the bucket from the desired key
IBlobCacheBucket bucket = _memCache.GetBucket(key);
//Obtain lock
IBlobCache cache = await bucket.ManualWaitAsync(cancellation);
try
{
//Try to read the value
if (cache.TryGetValue(key, out CacheEntry entry))
{
//Set result data
callback(state, entry.GetDataSegment());
}
}
finally
{
bucket.Release();
}
}
///<inheritdoc/>
public override Task AddOrUpdateAsync<T>(string key, string? newKey, ObjectDataGet<T> callback, T state, CancellationToken cancellation)
{
//Update object data
return _memCache.AddOrUpdateObjectAsync(key, newKey, callback, state, default, cancellation).AsTask();
}
}
}
|
