import { StateRegistry, DeepstreamPlugin, StateRegistryCallback } from '@deepstream/types';
/**
 * This class provides a generic mechanism that allows to maintain
 * a distributed state amongst the nodes of a cluster.
 */
export declare class SingleStateRegistry extends DeepstreamPlugin implements StateRegistry {
    description: string;
    private readonly data;
    private emitter;
    /**
    * Checks if a given entry exists within the registry
    */
    has(name: string): boolean;
    onAdd(callback: StateRegistryCallback): void;
    onRemove(callback: StateRegistryCallback): void;
    /**
    * Add a name/entry to the registry. If the entry doesn't exist yet,
    * this will notify the other nodes within the cluster
    */
    add(name: string): void;
    /**
    * Removes a name/entry from the registry. If the entry doesn't exist,
    * this will exit silently
    */
    remove(name: string): void;
    /**
    * Returns all currently registered entries
    */
    getAll(): string[];
    /**
     * Returns all the servers that hold a given state
     */
    getAllServers(subscriptionName: string): string[];
    /**
     * Removes all entries for a given serverName. This is intended to be called
     * whenever a node leaves the cluster
     */
    removeAll(serverName: string): void;
}