import { IMessage, OcppRequest, OcppResponse } from '../..';
import { CallAction } from '../../ocpp/rpc/message';
import { IModule } from '../modules';
import { HandlerProperties } from '.';
/**
 * MessageHandler
 *
 * The interface for all message handlers.
 *
 */
export interface IMessageHandler {
    /**
     * Subscribes to messages based on actions and context filters.
     *
     * @param identifier - The identifier to subscribe for.
     * @param actions - Optional. The list of call actions to subscribe to.
     * @param filter - Optional. An additional message context filter. **Note**: Might not be supported by all implementations. @see {@link IMessageContext} for available attributes.
     * @returns A promise that resolves to a boolean value indicating whether the initialization was successful.
     */
    subscribe(identifier: string, actions?: CallAction[], filter?: {
        [k: string]: string;
    }): Promise<boolean>;
    /**
     * Unsubscribe from messages. E.g. when a connection drops.
     *
     * @param identifier - The identifier to unsubscribe from.
     * @returns A promise that resolves to a boolean value indicating whether the unsubscription was successful.
     */
    unsubscribe(identifier: string): Promise<boolean>;
    /**
     * Handles incoming messages.
     * @param message - The message to be handled.
     * @param props - Optional properties for the handler.
     */
    handle(message: IMessage<OcppRequest | OcppResponse>, props?: HandlerProperties): void;
    /**
     * Shuts down the handler. Unregister all handlers and opening up any resources.
     */
    shutdown(): Promise<void>;
    get module(): IModule | undefined;
    set module(value: IModule | undefined);
}