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Performance optimizations

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This commit is contained in:
Christian Kratky
2017-04-09 15:10:35 +02:00
parent 8bfad437cf
commit 9816f12df6
16 changed files with 172 additions and 136 deletions
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MQTTnet.Core/Serializer/MqttPacketWriter.cs
+30 -32
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@@ -9,7 +9,7 @@ namespace MQTTnet.Core.Serializer
{
public sealed class MqttPacketWriter : IDisposable
{
private readonly MemoryStream _buffer = new MemoryStream();
private readonly MemoryStream _buffer = new MemoryStream(512);
public void InjectFixedHeader(byte fixedHeader)
{
@@ -20,31 +20,28 @@ namespace MQTTnet.Core.Serializer
return;
}
var backupBuffer = _buffer.ToArray();
var remainingLength = (int)_buffer.Length;
using (var buffer = new MemoryStream())
_buffer.SetLength(0);
_buffer.WriteByte(fixedHeader);
// Alorithm taken from http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html.
var x = remainingLength;
do
{
_buffer.WriteTo(buffer);
_buffer.SetLength(0);
_buffer.WriteByte(fixedHeader);
// Alorithm taken from http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html.
var x = remainingLength;
do
var encodedByte = x % 128;
x = x / 128;
if (x > 0)
{
var encodedByte = (byte)(x % 128);
x = x / 128;
if (x > 0)
{
encodedByte = (byte)(encodedByte | 128);
}
encodedByte = encodedByte | 128;
}
_buffer.WriteByte(encodedByte);
} while (x > 0);
_buffer.WriteByte((byte)encodedByte);
} while (x > 0);
buffer.Position = 0;
buffer.WriteTo(_buffer);
}
_buffer.Write(backupBuffer, 0, backupBuffer.Length);
}
public void InjectFixedHeader(MqttControlPacketType packetType, byte flags = 0)
@@ -59,11 +56,6 @@ namespace MQTTnet.Core.Serializer
_buffer.WriteByte(value);
}
public void Write(char value)
{
_buffer.WriteByte((byte)value);
}
public void Write(ushort value)
{
var buffer = BitConverter.GetBytes(value);
@@ -73,11 +65,15 @@ namespace MQTTnet.Core.Serializer
public void Write(ByteWriter value)
{
if (value == null) throw new ArgumentNullException(nameof(value));
_buffer.WriteByte(value.Value);
}
public void Write(byte[] value)
public void Write(params byte[] value)
{
if (value == null) throw new ArgumentNullException(nameof(value));
_buffer.Write(value, 0, value.Length);
}
@@ -94,14 +90,16 @@ namespace MQTTnet.Core.Serializer
Write(value);
}
public Task WriteToAsync(IMqttCommunicationChannel destination)
{
if (destination == null) throw new ArgumentNullException(nameof(destination));
return destination.WriteAsync(_buffer.ToArray());
}
public void Dispose()
{
_buffer?.Dispose();
}
public async Task WriteToAsync(IMqttCommunicationChannel destination)
{
await destination.WriteAsync(_buffer.ToArray());
}
}
}