/**
 * Define controls for managing entity lifecycle.
 */
export declare namespace Startable {
    /**
     * states for a Startable entity
     */
    enum State {
        STOPPED = "stopped",
        STARTING = "starting",
        RUNNING = "running",
        STOPPING = "stopping"
    }
    /**
     * define the structure of a Startable entity
     */
    interface IController {
        /**
         * current status of the entity
         */
        state: State;
        /**
         * handle the startup of an entity
         *
         * updates `state` according to lifecycle
         *
         * @returns {Promise<State>}
         */
        start(): Promise<State>;
        /**
         * handle the teardown of an entity
         *
         * updates `state` according to lifecycle
         *
         * @returns {Promise<State>}
         */
        stop(): Promise<State>;
    }
    abstract class Controller implements IController {
        state: State;
        /**
         * internal method to define specific startup routine
         *
         * used by `start()` internally
         *
         * implement with `protected` to keep hidden from class interface
         */
        protected abstract _start(): Promise<void>;
        /**
         * internal method to define teardown routine
         *
         * used by `stop()` internally
         *
         * implement with `protected` to keep hidden from class interface
         */
        protected abstract _stop(): Promise<void>;
        start(): Promise<State>;
        stop(): Promise<State>;
    }
}