Hotfix is a FIX engine written in pure .net geared towards low latency and high throughput.

The engine is highly optimized and garbage free, exhibiting predictably low latency even to the higher percentiles. Messages can be encoded/decoded in < 1 μs and over loopback the engine can achieve a median 12 μs round trip time...

The library is available via Nuget as package HotFix

Performance depends on hardware and operating system characteristics so we recommended you run the benchmark suite on your own hardware or even better run the benchmark acceptor and initiator applications...

This benchmark shows the round trip time for trading by running the acceptor and initiator benchmark apps over loopback on a Windows development desktop...

Below is a more detailed analysis of the same run:

These benchmarks show the latency for encoding and decoding FIX messages of varying sizes.

• Small message: 0.10 KB message with 10 fields (eg. heartbeat)
• Med'm message: 0.35 KB message with 30 fields (eg. execution report)
• Large message: 1.00 KB message with 90 fields (eg. market data incremental refresh)

/.bench/writing_messages-report-github.md

/.bench/parsing_messages-report-github.md

For more detailed benchmarks, see the .bench folder in the repository root

For detailed examples of usage, see HotFix.Demo.Acceptor/Program.cs and HotFix.Demo.Initiator/Program.cs.

var engine = new Engine();
var configuration = new Configuration
{
    Role = Role.Initiator,
    Version = "FIX.4.2",
    Host = "127.0.0.1",
    Port = 12345,
    Sender = "Client",
    Target = "Server",
    InboundSeqNum = 1,
    OutboundSeqNum = 1,
    HeartbeatInterval = 5
    LogFile = "messages.log"
};

using (var session = engine.Open(configuration))
{
    session.Logon();

    while (session.Active)
    {
        if (session.Receive()) Console.WriteLine($"Received message of type {session.Inbound[35].AsString}");
    }

    session.Logout();
}

The session exposes some events that you can handle:

session.LoggedOn += (s) => Console.WriteLine("Logged on");
session.LoggedOut += (s) => Console.WriteLine("Logged out");

session.Sent += (s,m) => Console.WriteLine($"Sent message of type  {m[35].AsString}");
session.Received += (s,m) => Console.WriteLine($"Received message of type  {m[35].AsString}");

Copyright (C) 2017 Fedja Bosnic and contributors

Released under the GNU Lesser General Public License V3

• Fedja Bosnic
• Giorgos Flourentzos