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/*
* Copyright (c) 2023 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Data.Caching
* File: JsonCacheObjectSerializer.cs
*
* JsonCacheObjectSerializer.cs is part of VNLib.Data.Caching which is part of the larger
* VNLib collection of libraries and utilities.
*
* VNLib.Data.Caching 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 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.IO;
using System.Buffers;
using System.Threading;
using System.Text.Json;
using System.Text.Json.Serialization;
namespace VNLib.Data.Caching
{
/// <summary>
/// Implements a <see cref="ICacheObjectDeserializer"/> and a <see cref="ICacheObjectSerializer"/>
/// that uses JSON serialization, with writer pooling. Members of this class are thread-safe.
/// </summary>
public class JsonCacheObjectSerializer : ICacheObjectSerializer, ICacheObjectDeserializer
{
private static readonly ThreadLocal<Utf8JsonWriter> _writer = new(static () => new(Stream.Null));
private readonly JsonSerializerOptions? _options;
/// <summary>
/// Initializes a new <see cref="JsonCacheObjectSerializer"/>
/// </summary>
/// <param name="options">JSON serialization/deserialization options</param>
public JsonCacheObjectSerializer(JsonSerializerOptions options) => _options = options;
/// <summary>
/// Initializes a new <see cref="JsonCacheObjectSerializer"/> using
/// the default serialization rules
/// </summary>
public JsonCacheObjectSerializer(int bufferSize)
{
//Configure default serialzation options
_options = new()
{
DictionaryKeyPolicy = JsonNamingPolicy.CamelCase,
NumberHandling = JsonNumberHandling.Strict,
ReadCommentHandling = JsonCommentHandling.Disallow,
WriteIndented = false,
DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull,
IgnoreReadOnlyFields = true,
PropertyNameCaseInsensitive = true,
IncludeFields = false,
DefaultBufferSize = bufferSize
};
}
///<inheritdoc/>
public virtual T? Deserialize<T>(ReadOnlySpan<byte> objectData) => JsonSerializer.Deserialize<T>(objectData, _options);
///<inheritdoc/>
public virtual void Serialize<T>(T obj, IBufferWriter<byte> finiteWriter)
{
//Read thread-local writer
Utf8JsonWriter localWriter = _writer.Value!;
//Init the writer with the new buffer writer
localWriter.Reset(finiteWriter);
try
{
//Serialize message
JsonSerializer.Serialize(localWriter, obj, _options);
//Flush writer to underlying buffer
localWriter.Flush();
}
finally
{
//Unlink the writer
localWriter.Reset(Stream.Null);
}
}
}
}
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