抽象可选options: EventEmitterOptions受保护_受保护init受保护logInitialize the manager. This method is idempotent. If already initialized, returns immediately. If initialization is in progress, waits for it to complete.
Check if the manager has been initialized.
Wait for the manager to be ready. Automatically calls initialize() if not already initialized.
受保护 抽象doSubclasses must implement this method to perform actual initialization. This method is called exactly once, when initialize() is first called.
Abstract base class for managers that require asynchronous initialization. Extends EventEmitter to allow managers to emit events.
示例