@actyx/sdk/lib/types/offsetMap.js

Actyx SDK

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.OffsetMap = exports._offsetMapLookup = void 0;
/*
 * Actyx SDK: Functions for writing distributed apps
 * deployed on peer-to-peer networks, without any servers.
 *
 * Copyright (C) 2021 Actyx AG
 */
const Option_1 = require("fp-ts/lib/Option");
const util_1 = require("../util");
const various_1 = require("./various");
const emptyOffsetMap = {};
/**
 * @internal
 */
const _offsetMapLookup = (m, s) => (0, Option_1.getOrElse)(() => various_1.Offset.min)((0, Option_1.fromNullable)(m[s]));
exports._offsetMapLookup = _offsetMapLookup;
/**
 * Updates a given psn map with a new event.
 * Note that the events need to be applied in event order
 *
 * @param psnMap the psn map to update. WILL BE MODIFIED IN PLACE
 * @param ev the event to include
 */
const includeEvent = (psnMap, ev) => {
    const { offset, stream } = ev;
    const current = (0, util_1.lookup)(psnMap, stream);
    if (current === undefined || current < offset) {
        psnMap[stream] = offset;
    }
    return psnMap;
};
/** OffsetMap companion functions.
 * @public */
exports.OffsetMap = {
    empty: emptyOffsetMap,
    isEmpty: (m) => Object.keys(m).length === 0,
    lookup: exports._offsetMapLookup,
    lookupOrUndefined: (m, s) => m[s],
    update: includeEvent,
};
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