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/*
* Copyright (c) 2024 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Plugins.Extensions.VNCache
* File: EntityCacheBuilder.cs
*
* EntityCacheBuilder.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.Threading.Tasks;
using VNLib.Utils.Logging;
namespace VNLib.Plugins.Extensions.VNCache.DataModel
{
/// <summary>
/// Represents a cache that can store entities by their unique key
/// </summary>
/// <typeparam name="TEntity"></typeparam>
/// <param name="cache"></param>
public sealed class EntityCacheBuilder<TEntity>(IEntityCache<TEntity> cache)
where TEntity : class
{
ICacheExpirationPolicy<TEntity>? _expPolicy;
ICacheTaskPolicy? _taskPolicy;
public EntityCacheBuilder<TEntity> WithExpirationPoicy(ICacheExpirationPolicy<TEntity> expiration)
{
_expPolicy = expiration;
return this;
}
public EntityCacheBuilder<TEntity> WithInfiniteExpiration()
{
_expPolicy = new InfiniteCacheExpirationPolicy<TEntity>();
return this;
}
public EntityCacheBuilder<TEntity> WithTaskPolicy(ICacheTaskPolicy taskPolicy)
{
_taskPolicy = taskPolicy;
return this;
}
public EntityCacheBuilder<TEntity> WithWriteBackPolicy(Action<Task> onFaulted)
{
_taskPolicy = new WriteBackCachePolicy(onFaulted);
return this;
}
public EntityCacheBuilder<TEntity> WithWriteBackPolicy(ILogProvider logger, LogLevel logLevel = LogLevel.Warning)
{
_taskPolicy = new WriteBackCachePolicy((t) =>
{
logger.Write(logLevel, t.Exception!, "Background task operation failed with exception: ");
});
return this;
}
public EntityCacheBuilder<TEntity> WithWriteThoughPolicy()
{
_taskPolicy = WriteThroughCachePolicy.Instance;
return this;
}
public EntityResultCache<TEntity> Build()
{
ArgumentNullException.ThrowIfNull(_expPolicy, "Expiration");
ArgumentNullException.ThrowIfNull(cache);
ArgumentNullException.ThrowIfNull(_taskPolicy, "TaskPolicy");
return new EntityResultCache<TEntity>(cache, _taskPolicy, _expPolicy);
}
}
}
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