import * as grpc from 'grpc';
import { Interceptor } from "./interceptors/chain";
import { GrpcMonitor } from "./monitor";
import { Sentinel } from "@nimbus/operational";
export interface PoolOptions {
    address: string;
    credentials: grpc.ChannelCredentials;
    size?: number;
    options?: {
        [x: string]: any;
        interceptors?: Interceptor[];
    };
}
export declare enum PoolStatus {
    AllDisconnected = 0,
    AllConnected = 1,
    SomeConnected = 2
}
export declare type ClientConstructor<Client> = new (address: string, credentials: grpc.ChannelCredentials, options?: object) => Client;
export declare class Pool<Client extends grpc.Client> {
    clients: Client[];
    provider: IterableIterator<Client>;
    status: PoolStatus;
    _monitor?: GrpcMonitor<Client>;
    constructor(clientProto: ClientConstructor<Client>, options: PoolOptions);
    private watchConnections;
    protected make(index: number, clientProto: ClientConstructor<Client>, options: PoolOptions): Client;
    private startProvider;
    get(): Client;
    monitor(sentinel: Sentinel): this;
}