ExecutionTrackerAdapter

ExecutionTrackerAdapter is a proxy that forwards order execution events to an IExecutionTracker, timestamping each transition with steady_clock::now().

class ExecutionTrackerAdapter : public ISubsystem, public IOrderExecutionListener
{
public:
  ExecutionTrackerAdapter(SubscriberId id, IExecutionTracker* tracker);
  // All IOrderExecutionListener methods overridden
private:
  IExecutionTracker* _tracker = nullptr;
};

Purpose

• Decouple execution tracking logic from the event delivery mechanism by timestamping and delegating events to a metrics recorder.

Responsibilities

Method	Delegated To
onOrderSubmitted	_tracker->onOrderSubmitted(..., now)
onOrderAccepted	_tracker->onOrderAccepted(..., now)
onOrderPartiallyFilled	_tracker->onOrderPartiallyFilled(..., now)
onOrderFilled	_tracker->onOrderFilled(..., now)
onOrderCanceled	_tracker->onOrderCanceled(..., now)
onOrderExpired	_tracker->onOrderExpired(..., now)
onOrderRejected	_tracker->onOrderRejected(..., now)
onOrderReplaced	_tracker->onOrderReplaced(..., now)

Notes

• Inherits from both ISubsystem (for lifecycle management) and IOrderExecutionListener (for event handling).
• Uses std::chrono::steady_clock::now() to consistently timestamp all events.
• The adapter does not own the IExecutionTracker; it assumes external lifetime management.
• Enables clean separation of metrics collection from trading logic.