/
BinaryFileMessageSerializer.cs
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/
BinaryFileMessageSerializer.cs
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// Copyright (c) 2020 Sergio Aquilini
// This code is licensed under MIT license (see LICENSE file for details)
using System;
using System.Diagnostics.CodeAnalysis;
using System.IO;
using System.Threading.Tasks;
using Silverback.Messaging.Messages;
using Silverback.Messaging.Serialization;
using Silverback.Util;
namespace Silverback.Messaging.BinaryFiles
{
/// <summary>
/// Handles the default implementation of <see cref="IBinaryFileMessage" />. It's not really a
/// serializer, since the raw binary content is transmitted as-is.
/// </summary>
public class BinaryFileMessageSerializer : IMessageSerializer
{
/// <summary>
/// Gets the default static instance of <see cref="BinaryFileMessageSerializer" />.
/// </summary>
public static BinaryFileMessageSerializer Default { get; } = new();
/// <inheritdoc cref="IMessageSerializer.RequireHeaders" />
public bool RequireHeaders => false;
/// <inheritdoc cref="IMessageSerializer.SerializeAsync" />
[SuppressMessage("", "CA2000", Justification = "MemoryStream is being returned")]
public ValueTask<Stream?> SerializeAsync(
object? message,
MessageHeaderCollection messageHeaders,
MessageSerializationContext context)
{
Check.NotNull(messageHeaders, nameof(messageHeaders));
if (message == null)
return ValueTaskFactory.FromResult<Stream?>(null);
if (message is Stream inputStream)
return ValueTaskFactory.FromResult<Stream?>(inputStream);
if (message is byte[] inputBytes)
return ValueTaskFactory.FromResult<Stream?>(new MemoryStream(inputBytes));
var binaryFileMessage = message as IBinaryFileMessage;
if (binaryFileMessage == null)
{
throw new ArgumentException(
"The message is not implementing the IBinaryFileMessage interface.",
nameof(message));
}
messageHeaders.AddOrReplace(
DefaultMessageHeaders.MessageType,
message.GetType().AssemblyQualifiedName);
return ValueTaskFactory.FromResult(binaryFileMessage.Content);
}
/// <inheritdoc cref="IMessageSerializer.DeserializeAsync" />
public ValueTask<(object? Message, Type MessageType)> DeserializeAsync(
Stream? messageStream,
MessageHeaderCollection messageHeaders,
MessageSerializationContext context)
{
Check.NotNull(messageHeaders, nameof(messageHeaders));
var type = SerializationHelper.GetTypeFromHeaders(messageHeaders) ??
typeof(BinaryFileMessage);
var messageModel = (IBinaryFileMessage)Activator.CreateInstance(type);
messageModel.Content = messageStream;
return ValueTaskFactory.FromResult<(object?, Type)>((messageModel, type));
}
}
}