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/*
* Copyright (c) 2023 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Data.Caching.Providers.VNCache
* File: AddOrUpdateBuffer.cs
*
* AddOrUpdateBuffer.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.Buffers;
using VNLib.Utils;
using VNLib.Utils.Memory;
using VNLib.Utils.Extensions;
namespace VNLib.Data.Caching.Providers.VNCache
{
/// <summary>
/// Implements a buffer writer that serves to serialize object data and
/// store the object data for use by the memory cache store, and the
/// remote cache store
/// </summary>
internal sealed class AddOrUpdateBuffer : VnDisposeable, IBufferWriter<byte>, IObjectData
{
private int _count;
private readonly IUnmangedHeap _heap;
private MemoryHandle<byte>? _buffer;
public AddOrUpdateBuffer(IUnmangedHeap heap)
{
_heap = heap;
}
///<inheritdoc/>
public void Advance(int count)
{
//Update count
_count += count;
}
///<inheritdoc/>
Memory<byte> IBufferWriter<byte>.GetMemory(int sizeHint = 0)
{
throw new NotImplementedException();
}
///<inheritdoc/>
Span<byte> IBufferWriter<byte>.GetSpan(int sizeHint = 0)
{
//Round to nearest page for new size
nint newSize = MemoryUtil.NearestPage(sizeHint + _count);
//Alloc buffer it not yet allocated
if (_buffer == null)
{
_buffer = _heap.Alloc<byte>(newSize);
}
else
{
//check for resize if allocated
_buffer.ResizeIfSmaller(newSize);
}
return _buffer.AsSpan(_count);
}
void IObjectData.SetData(ReadOnlySpan<byte> data)
{
throw new NotSupportedException();
}
///<inheritdoc/>
public ReadOnlySpan<byte> GetData() => _buffer!.AsSpan(0, _count);
protected override void Free()
{
_buffer?.Dispose();
}
}
}
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