Engine

Engine coordinates the startup and shutdown of the entire trading system. It owns the engine configuration, all exchange connectors, and system subsystems.

class Engine : public ISubsystem
{
public:
  Engine(const EngineConfig& config,
         std::vector<std::unique_ptr<ISubsystem>> subsystems,
         std::vector<std::shared_ptr<IExchangeConnector>> connectors);

  void start() override;
  void stop() override;
};

Purpose

• Central orchestration unit responsible for lifecycle management of all core components.

Responsibilities

Aspect	Description
Configuration	Stores full EngineConfig used by subsystems and connectors.
Subsystems	Owns and manages startup/teardown of all registered ISubsystems.
Connectors	Retains exchange adapters to prevent premature destruction.

ExchangeInstance

struct ExchangeInstance
{
  std::string exchangeType;
  std::string name;
  std::string symbol;
  std::shared_ptr<IExchangeConnector> connector;
};

Field	Description
exchangeType	Registered type used in factory resolution.
name	User-defined alias for logging or mapping.
symbol	Symbol string for routing or filtering.
connector	Pointer to live exchange connection.

Notes

• start()/stop() invoke lifecycle methods on all subsystems in the order defined.
• All subsystems are owned via unique_ptr; destruction is deterministic and ordered.
• Designed to decouple bootstrapping logic from component logic — the Engine is not involved in runtime signal or data flow.