@eventstore.net/event.store/dist/provider/memory.js

A simple and fast EventStore that support multiple persistence and notification providers

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const _ = require("lodash");
/**
 * A Persistence Provider that handle all the data in memory. It is a very simple implementation that should be used
 * only for development and test purposes.
 */
class InMemoryProvider {
    constructor() {
        this.store = new Map();
    }
    async addEvent(stream, data, type = '') {
        const currentEvents = await this.getEventsList(stream.aggregation, stream.id);
        const event = {
            commitTimestamp: new Date().getTime(),
            payload: data,
            sequence: currentEvents.length,
            type: type
        };
        currentEvents.push(event);
        return event;
    }
    async getEvents(stream, offset = 0, limit) {
        const history = this.getEventsList(stream.aggregation, stream.id);
        return _(history).drop(offset).take(limit || history.length).value();
    }
    async getAggregations(offset = 0, limit) {
        const keys = Array.from(this.store.keys());
        return _(keys).sort().drop(offset).take(limit || this.store.size).value();
    }
    async getStreams(aggregation, offset = 0, limit) {
        const streams = this.store.get(aggregation);
        if (streams) {
            const keys = Array.from(streams.keys());
            return _(keys).sort().drop(offset).take(limit || this.store.size).value();
        }
        return [];
    }
    getEventsList(aggregation, streamId) {
        let streams = this.store.get(aggregation);
        if (!streams) {
            streams = new Map();
            this.store.set(aggregation, streams);
        }
        let history = streams.get(streamId);
        if (!history) {
            history = new Array();
            streams.set(streamId, history);
        }
        return history;
    }
}
exports.InMemoryProvider = InMemoryProvider;
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