import { ChannelOptions } from './channel-options';
import { Subchannel } from './subchannel';
import { SubchannelAddress } from './subchannel-address';
import { ChannelCredentials } from './channel-credentials';
import { GrpcUri } from './uri-parser';
export declare class SubchannelPool {
private pool;
/**
* A timer of a task performing a periodic subchannel cleanup.
*/
private cleanupTimer;
/**
* A pool of subchannels use for making connections. Subchannels with the
* exact same parameters will be reused.
*/
constructor();
/**
* Unrefs all unused subchannels and cancels the cleanup task if all
* subchannels have been unrefed.
*/
unrefUnusedSubchannels(): void;
/**
* Ensures that the cleanup task is spawned.
*/
ensureCleanupTask(): void;
/**
* Get a subchannel if one already exists with exactly matching parameters.
* Otherwise, create and save a subchannel with those parameters.
* @param channelTarget
* @param subchannelTarget
* @param channelArguments
* @param channelCredentials
*/
getOrCreateSubchannel(channelTargetUri: GrpcUri, subchannelTarget: SubchannelAddress, channelArguments: ChannelOptions, channelCredentials: ChannelCredentials): Subchannel;
}
/**
* Get either the global subchannel pool, or a new subchannel pool.
* @param global
*/
export declare function getSubchannelPool(global: boolean): SubchannelPool;