ConnectorManager

ConnectorManager owns multiple concrete ExchangeConnector instances and coordinates their lifecycle and callback wiring.

class ConnectorManager {
public:
  void registerConnector(std::shared_ptr<ExchangeConnector> connector);

  void startAll(ExchangeConnector::BookUpdateCallback onBookUpdate,
                ExchangeConnector::TradeCallback      onTrade);

private:
  std::map<std::string, std::shared_ptr<ExchangeConnector>> connectors; // id → connector
};

Purpose

• Maintain a collection of active exchange connectors, indexed by exchangeId().
• Provide a single entry point (startAll) to initialise callbacks and start every connector in one call.

Responsibilities

Action	Behaviour
registerConnector	Stores the shared pointer under its exchangeId() key (overwrites duplicates).
startAll	Binds the supplied callbacks to each connector and calls start() on all of them.

Internal Behaviour

• Connectors are kept in a std::map to guarantee deterministic iteration order when starting (useful for reproducible tests).
• Callbacks are forwarded via lambdas that capture the original onBookUpdate and onTrade by move; this avoids extra indirections and preserves mutability.

Notes

• No explicit stopAll yet — ensure each connector stops itself on destruction or extend the manager if coordinated shutdown is required.
• Thread safety: registration and startAll should run from the same thread during engine bootstrap.