import type { ObjectId } from '../bson';
import type { AnyError } from '../error';
import type { Connection } from './connection';
import type { ConnectionPool, ConnectionPoolOptions } from './connection_pool';
/**
 * The base export class for all monitoring events published from the connection pool
 * @public
 * @category Event
 */
export declare class ConnectionPoolMonitoringEvent {
    /** A timestamp when the event was created  */
    time: Date;
    /** The address (host/port pair) of the pool */
    address: string;
    /** @internal */
    constructor(pool: ConnectionPool);
}
/**
 * An event published when a connection pool is created
 * @public
 * @category Event
 */
export declare class ConnectionPoolCreatedEvent extends ConnectionPoolMonitoringEvent {
    /** The options used to create this connection pool */
    options?: ConnectionPoolOptions;
    /** @internal */
    constructor(pool: ConnectionPool);
}
/**
 * An event published when a connection pool is closed
 * @public
 * @category Event
 */
export declare class ConnectionPoolClosedEvent extends ConnectionPoolMonitoringEvent {
    /** @internal */
    constructor(pool: ConnectionPool);
}
/**
 * An event published when a connection pool creates a new connection
 * @public
 * @category Event
 */
export declare class ConnectionCreatedEvent extends ConnectionPoolMonitoringEvent {
    /** A monotonically increasing, per-pool id for the newly created connection */
    connectionId: number | '<monitor>';
    /** @internal */
    constructor(pool: ConnectionPool, connection: {
        id: number | '<monitor>';
    });
}
/**
 * An event published when a connection is ready for use
 * @public
 * @category Event
 */
export declare class ConnectionReadyEvent extends ConnectionPoolMonitoringEvent {
    /** The id of the connection */
    connectionId: number | '<monitor>';
    /** @internal */
    constructor(pool: ConnectionPool, connection: Connection);
}
/**
 * An event published when a connection is closed
 * @public
 * @category Event
 */
export declare class ConnectionClosedEvent extends ConnectionPoolMonitoringEvent {
    /** The id of the connection */
    connectionId: number | '<monitor>';
    /** The reason the connection was closed */
    reason: string;
    serviceId?: ObjectId;
    /** @internal */
    constructor(pool: ConnectionPool, connection: Connection, reason: string);
}
/**
 * An event published when a request to check a connection out begins
 * @public
 * @category Event
 */
export declare class ConnectionCheckOutStartedEvent extends ConnectionPoolMonitoringEvent {
    /** @internal */
    constructor(pool: ConnectionPool);
}
/**
 * An event published when a request to check a connection out fails
 * @public
 * @category Event
 */
export declare class ConnectionCheckOutFailedEvent extends ConnectionPoolMonitoringEvent {
    /** The reason the attempt to check out failed */
    reason: AnyError | string;
    /** @internal */
    constructor(pool: ConnectionPool, reason: AnyError | string);
}
/**
 * An event published when a connection is checked out of the connection pool
 * @public
 * @category Event
 */
export declare class ConnectionCheckedOutEvent extends ConnectionPoolMonitoringEvent {
    /** The id of the connection */
    connectionId: number | '<monitor>';
    /** @internal */
    constructor(pool: ConnectionPool, connection: Connection);
}
/**
 * An event published when a connection is checked into the connection pool
 * @public
 * @category Event
 */
export declare class ConnectionCheckedInEvent extends ConnectionPoolMonitoringEvent {
    /** The id of the connection */
    connectionId: number | '<monitor>';
    /** @internal */
    constructor(pool: ConnectionPool, connection: Connection);
}
/**
 * An event published when a connection pool is cleared
 * @public
 * @category Event
 */
export declare class ConnectionPoolClearedEvent extends ConnectionPoolMonitoringEvent {
    /** @internal */
    serviceId?: ObjectId;
    /** @internal */
    constructor(pool: ConnectionPool, serviceId?: ObjectId);
}
//# sourceMappingURL=connection_pool_events.d.ts.map