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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.Buffers;
using System.Text.Json;
using System.Text.Json.Serialization;
using VNLib.Utils.Memory.Caching;
namespace VNLib.Data.Caching
{
/// <summary>
/// Implements a <see cref="ICacheObjectDeserialzer"/> and a <see cref="ICacheObjectSerialzer"/>
/// that uses JSON serialization, with writer pooling. Members of this class are thread-safe.
/// </summary>
public class JsonCacheObjectSerializer : ICacheObjectSerialzer, ICacheObjectDeserialzer
{
//Create threadlocal writer for attempted lock-free writer reuse
private static readonly ObjectRental<ReusableJsonWriter> JsonWriterPool = ObjectRental.CreateThreadLocal<ReusableJsonWriter>();
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()
{
//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,
//Use small buffers
DefaultBufferSize = 128
};
}
///<inheritdoc/>
public virtual object? Deserialze(Type type, ReadOnlySpan<byte> objectData)
{
return JsonSerializer.Deserialize(objectData, type, _options);
}
///<inheritdoc/>
public virtual void Serialize<T>(T obj, IBufferWriter<byte> finiteWriter)
{
//Rent new json writer
ReusableJsonWriter writer = JsonWriterPool.Rent();
try
{
//Serialize the message
writer.Serialize(finiteWriter, obj, _options);
}
finally
{
JsonWriterPool.Return(writer);
}
}
}
}
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