OrderEvent

OrderEvent encapsulates a single order lifecycle transition and delivers it to components via OrderExecutionBus.

struct OrderEvent {
  using Listener = IOrderExecutionListener;

  OrderEventStatus type{};
  Order order{};
  Order newOrder{};
  Quantity fillQty{0};
  uint64_t tickSequence = 0;

  void dispatchTo(IOrderExecutionListener& listener) const;
};

Purpose

• Represent and route order state changes (submission, fills, cancelation, etc.) to execution listeners.

Responsibilities

Field	Description
type	Event type — one of SUBMITTED, FILLED, REPLACED, etc.
order	The primary order involved in the event.
newOrder	Used only for REPLACED events.
fillQty	Quantity filled (used only in PARTIALLY_FILLED).
tickSequence	Event ordering marker for sequencing and backtesting.

Dispatch Logic

void dispatchTo(IOrderExecutionListener& listener) const;

Routes the event to the appropriate method:

Type	Dispatched Method
SUBMITTED	onOrderSubmitted(order)
ACCEPTED	onOrderAccepted(order)
PARTIALLY_FILLED	onOrderPartiallyFilled(order, fillQty)
FILLED	onOrderFilled(order)
CANCELED	onOrderCanceled(order)
EXPIRED	onOrderExpired(order)
REJECTED	onOrderRejected(order, /*reason*/ "")
REPLACED	onOrderReplaced(order, newOrder)

Notes

• Dispatch is type-safe and static — no RTTI or dynamic casts.
• tickSequence ensures global ordering consistency across mixed event streams.
• Used by EventBus<OrderEvent, *> and delivered to IOrderExecutionListener implementations.