[Exchange-3] Gateway Service #5

The Gateway is the exchange’s client-facing ingress layer responsible for maintaining FIX sessions with brokers and HFTs, receiving inbound order messages, and performing lightweight protocol and session validation before orders enter the deterministic core.

As a process it-

• Listens on a TCP port.
• Accepts many client connections (brokers/HFTs).
• Parses very simplified FIX-like NewOrderSingle messages.
• For each order, generates an internal order ID, sends back a simple FIX ack with that internal ID and send the order to sequence process.