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Optimize package serializing and dispatching.

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This commit is contained in:
Christian Kratky
2018-06-05 21:13:58 +02:00
parent c88b46783b
commit 31b4eb7937
9 changed files with 103 additions and 71 deletions
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Frameworks/MQTTnet.NetStandard/Serializer/MqttPacketSerializer.cs
+18 -10
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@@ -10,6 +10,8 @@ namespace MQTTnet.Serializer
{
public class MqttPacketSerializer : IMqttPacketSerializer
{
private const int FixedHeaderSize = 1;
public MqttProtocolVersion ProtocolVersion { get; set; } = MqttProtocolVersion.V311;
public ArraySegment<byte> Serialize(MqttBasePacket packet)
@@ -18,27 +20,33 @@ namespace MQTTnet.Serializer
using (var stream = new MemoryStream(128))
{
// Leave enough head space for max header size (fixed + 4 variable remaining length)
stream.Position = 5;
// Leave enough head space for max header size (fixed + 4 variable remaining length = 5 bytes)
stream.Seek(5, SeekOrigin.Begin);
var fixedHeader = SerializePacket(packet, stream);
var remainingLength = (int)stream.Length - 5;
stream.Position = 1;
var remainingLength = MqttPacketWriter.EncodeRemainingLength((int)stream.Length - 5, stream);
var remainingLengthSize = MqttPacketWriter.WriteRemainingLength(remainingLength, stream);
var headerSize = remainingLength + 1;
var headerSize = FixedHeaderSize + remainingLengthSize;
var headerOffset = 5 - headerSize;
// Position cursor on correct offset on beginining of array (has leading 0x0)
stream.Position = headerOffset;
stream.Seek(headerOffset, SeekOrigin.Begin);
stream.WriteByte(fixedHeader);
#if NET461 || NET452 || NETSTANDARD2_0
var buffer = stream.GetBuffer();
#else
var buffer = stream.ToArray();
#endif
return new ArraySegment<byte>(buffer, headerOffset, (int)stream.Length - headerOffset);
#else
if (stream.TryGetBuffer(out var segment))
{
return new ArraySegment<byte>(segment.Array, headerOffset, segment.Count - headerOffset);
}
var buffer = stream.ToArray();
return new ArraySegment<byte>(buffer, headerOffset, buffer.Length - headerOffset);
#endif
}
}