botbuilder-core/lib/botState.d.ts

Core components for Microsoft Bot Builder. Components in this library can run either in a browser or on the server.

/**
 * @module botbuilder
 */
/**
 * Copyright (c) Microsoft Corporation. All rights reserved.
 * Licensed under the MIT License.
 */
import { StatePropertyAccessor } from './botStatePropertyAccessor';
import { PropertyManager } from './propertyManager';
import { Storage, StorageKeyFactory } from './storage';
import { TurnContext } from './turnContext';
/**
 * State information cached off the context object by a `BotState` instance.
 */
export interface CachedBotState {
    /**
     * Dictionary of state values.
     */
    state: {
        [id: string]: any;
    };
    /**
     * Hash of the last known state values. This is used to perform change detection.
     */
    hash: string;
}
/**
 * Base class for the frameworks state persistance scopes.
 *
 * @remarks
 * This class will read and write state, to a provided storage provider, for each turn of
 * conversation with a user. Derived classes, like `ConversationState` and `UserState`, provide a
 * `StorageKeyFactory` which is used to determine the key used to persist a given storage object.
 *
 * The state object thats loaded will be automatically cached on the context object for the
 * lifetime of the turn and will only be written to storage if it has been modified.
 */
export declare class BotState implements PropertyManager {
    protected storage: Storage;
    protected storageKey: StorageKeyFactory;
    private stateKey;
    /**
     * Creates a new BotState instance.
     *
     * @param storage Storage provider to persist the state object to.
     * @param storageKey Function called anytime the storage key for a given turn needs to be calculated.
     */
    constructor(storage: Storage, storageKey: StorageKeyFactory);
    /**
     * Creates a new property accessor for reading and writing an individual property to the bot
     * states storage object.
     *
     * @template T The type of property to create. Defaults to `any` type.
     * @param name Name of the property to add.
     * @returns An accessor for the property.
     */
    createProperty<T = any>(name: string): StatePropertyAccessor<T>;
    /**
     * Reads in and caches the backing state object for a turn.
     *
     * @remarks
     * Subsequent reads will return the cached object unless the `force` flag is passed in which
     * will force the state object to be re-read.
     *
     * This method is automatically called on first access of any of created property accessors.
     *
     * ```JavaScript
     * const state = await botState.load(context);
     * ```
     * @param context Context for current turn of conversation with the user.
     * @param force (Optional) If `true` the cache will be bypassed and the state will always be read in directly from storage. Defaults to `false`.
     * @returns {Promise<any>} The cached state.
     */
    load(context: TurnContext, force?: boolean): Promise<any>;
    /**
     * Saves the cached state object if it's been changed.
     *
     * @remarks
     * If the `force` flag is passed in the cached state object will be saved regardless of
     * whether its been changed or not and if no object has been cached, an empty object will be
     * created and then saved.
     *
     * ```JavaScript
     * await botState.saveChanges(context);
     * ```
     * @param context Context for current turn of conversation with the user.
     * @param force (Optional) if `true` the state will always be written out regardless of its change state. Defaults to `false`.
     * @returns {Promise<void>} A promise representing the async operation.
     */
    saveChanges(context: TurnContext, force?: boolean): Promise<void>;
    /**
     * Clears the current state object for a turn.
     *
     * @remarks
     * The cleared state object will not be persisted until [saveChanges()](#savechanges) has
     * been called.
     *
     * ```JavaScript
     * await botState.clear(context);
     * await botState.saveChanges(context);
     * ```
     * @param context Context for current turn of conversation with the user.
     * @returns {Promise<void>} A promise representing the async operation.
     */
    clear(context: TurnContext): Promise<void>;
    /**
     * Delete the backing state object for the current turn.
     *
     * @remarks
     * The state object will be removed from storage if it exists.  If the state object has been
     * read in and cached, the cache will be cleared.
     *
     * ```JavaScript
     * await botState.delete(context);
     * ```
     * @param context Context for current turn of conversation with the user.
     * @returns {Promise<void>} A promise representing the async operation.
     */
    delete(context: TurnContext): Promise<void>;
    /**
     * Returns a cached state object or undefined if not cached.
     *
     * @remarks
     * This example shows how to synchronously get an already loaded and cached state object:
     *
     * ```JavaScript
     * const state = botState.get(context);
     * ```
     * @param context Context for current turn of conversation with the user.
     * @returns A cached state object or undefined if not cached.
     */
    get(context: TurnContext): any | undefined;
}
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