import { CancelablePromise, PubSubService, ServiceParameters } from "@webda/core";
import * as amqplib from "amqplib";
export declare class AMQPPubSubParameters extends ServiceParameters {
    url: string;
    channel: string;
    /**
     * @default ""
     * @SchemaOptional
     */
    subscription: string;
    exchange?: {
        /**
         * @default fanout
         */
        type?: string;
        /**
         * if true, the exchange will survive broker restarts.
         * @default true
         */
        durable?: boolean;
        /**
         * if true, messages cannot be published directly to the exchange
         * (i.e., it can only be the target of bindings, or possibly create messages ex-nihilo).
         * @default false
         */
        internal?: boolean;
        /**
         * if true, the exchange will be destroyed once the number of bindings for which it is the source drop to zero.
         * @default false
         */
        autoDelete?: boolean;
        /**
         * an exchange to send messages to if this exchange can’t route them to any queues.
         *
         * Specific to RabbitMQ
         */
        alternateExchange?: string;
        /**
         * any additional arguments that may be needed by an exchange
         */
        arguments?: any;
    };
    constructor(params: Partial<AMQPPubSubParameters>);
}
/**
 *
 * @see https://www.rabbitmq.com/tutorials/tutorial-three-python.html
 * @WebdaModda AMQPPubSub
 */
export default class AMQPPubSubService<T = any, K extends AMQPPubSubParameters = AMQPPubSubParameters> extends PubSubService<T, K> {
    channel: amqplib.Channel;
    conn: amqplib.ChannelModel;
    exchange: any;
    /**
     * @override
     */
    loadParameters(params: any): AMQPPubSubParameters;
    /**
     * @override
     */
    sendMessage(event: T, routingKey?: string): Promise<void>;
    /**
     * @override
     */
    init(): Promise<this>;
    /**
     * Return queue size
     * @returns
     */
    size(): Promise<number>;
    /**
     * Work a queue calling the callback with every Event received
     * If the callback is called without exception the `deleteMessage` is called
     * @param callback
     * @param eventPrototype
     */
    consume(callback: (event: T) => Promise<void>, eventPrototype?: {
        new (): T;
    }, onBind?: () => void): CancelablePromise;
}
export { AMQPPubSubService };