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/*
* Copyright (c) 2024 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Data.Caching.Providers.VNCache
* File: VNCacheBase.cs
*
* VNCacheBase.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.Threading;
using System.Threading.Tasks;
using VNLib.Plugins;
using VNLib.Plugins.Extensions.Loading;
namespace VNLib.Data.Caching.Providers.VNCache
{
internal abstract class VNCacheBase(VNCacheConfig conf) : IGlobalCacheProvider
{
///<inheritdoc/>
public abstract bool IsConnected { get; }
///<inheritdoc/>
public virtual ICacheObjectDeserializer DefaultDeserializer => conf.CacheObjectDeserializer!;
///<inheritdoc/>
public virtual ICacheObjectSerializer DefaultSerializer => conf.CacheObjectSerializer!;
///<inheritdoc/>
public abstract Task AddOrUpdateAsync<T>(string key, string? newKey, T value, ICacheObjectSerializer serialzer, CancellationToken cancellation);
///<inheritdoc/>
public abstract Task AddOrUpdateAsync<T>(string key, string? newKey, ObjectDataGet<T> callback, T state, CancellationToken cancellation);
///<inheritdoc/>
public abstract Task<bool> DeleteAsync(string key, CancellationToken cancellation);
///<inheritdoc/>
public abstract Task<T?> GetAsync<T>(string key, ICacheObjectDeserializer deserializer, CancellationToken cancellation);
///<inheritdoc/>
public abstract Task GetAsync<T>(string key, ObjectDataSet<T> callback, T state, CancellationToken cancellation);
///<inheritdoc/>
public abstract object GetUnderlyingStore();
/// <summary>
/// Initializes a set of cache object serializers and deserializers
/// for the configuration instance and loads external serializers if specified
/// by the user.
/// </summary>
/// <param name="config">The configuration instance to initialzie</param>
/// <param name="plugin">Optional plugin for loading external serializers</param>
protected static void InitSerializers(VNCacheConfig config, PluginBase? plugin)
{
//See if user has specified a custom serializer assembly
if (!string.IsNullOrWhiteSpace(config.SerializerDllPath))
{
//Load the custom serializer assembly and get the serializer and deserializer instances
config.CacheObjectSerializer = plugin.CreateServiceExternal<ICacheObjectSerializer>(config.SerializerDllPath);
//Avoid creating another instance if the deserializer is the same as the serializer
if(config.CacheObjectSerializer is ICacheObjectDeserializer cod)
{
config.CacheObjectDeserializer = cod;
}
else
{
config.CacheObjectDeserializer = plugin.CreateServiceExternal<ICacheObjectDeserializer>(config.SerializerDllPath);
}
}
//If no default serializer is set, use the default JSON serializer
config.CacheObjectSerializer ??= new JsonCacheObjectSerializer(256);
config.CacheObjectDeserializer ??= new JsonCacheObjectSerializer(256);
}
}
}
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