/*!
 * Copyright (c) Microsoft Corporation and contributors. All rights reserved.
 * Licensed under the MIT License.
 */
/// <reference types="node" />
import { EventEmitter } from "events";
import { IContext, IQueuedMessage, IRoutingKey } from "@fluidframework/server-services-core";
import { DocumentContext } from "./documentContext";
/**
 * The DocumentContextManager manages a set of created DocumentContexts and computes an aggregate checkpoint offset
 * from them.
 */
export declare class DocumentContextManager extends EventEmitter {
    private readonly partitionContext;
    private readonly contexts;
    private head;
    private tail;
    private lastCheckpoint;
    private closed;
    private headPaused;
    private tailPaused;
    constructor(partitionContext: IContext);
    /**
     * Creates a context that should be used for a single document partition
     * This class is responsible for the lifetime of the context
     */
    createContext(routingKey: IRoutingKey, head: IQueuedMessage): DocumentContext;
    removeContext(context: DocumentContext): void;
    getHeadOffset(): number;
    /**
     * Updates the head to the new offset. The head offset will not be updated if it stays the same or moves backwards, unless headPaused is true.
     * @returns True if the head was updated, false if it was not.
     */
    setHead(head: IQueuedMessage): boolean;
    setTail(tail: IQueuedMessage): void;
    close(): void;
    private updateCheckpoint;
}
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