@bazilio-san/af-stream/dist/esm/RecordsBuffer.js

Data stream from database table

import { findIndexOfNearestSmaller } from './utils/find-index-of-nearest-smaller';
import { TS_FIELD } from './constants';
export class RecordsBuffer {
    constructor() {
        this.buffer = [];
        this.first = null;
        this.last = null;
        this.firstTs = 0;
        this.lastTs = 0;
        this.setEdges();
    }
    setEdges() {
        var _a, _b;
        const { buffer: rb } = this;
        this.first = rb[0] || null;
        this.last = rb.length ? rb[rb.length - 1] : null;
        this.firstTs = ((_a = this.first) === null || _a === void 0 ? void 0 : _a[TS_FIELD]) || 0;
        this.lastTs = ((_b = this.last) === null || _b === void 0 ? void 0 : _b[TS_FIELD]) || 0;
    }
    add(forBuffer) {
        this.buffer.push(...forBuffer);
        this.setEdges();
    }
    getMsDistance() {
        const { firstTs, lastTs } = this;
        if (!this.buffer.length || lastTs < firstTs) {
            return 0;
        }
        return lastTs - firstTs;
    }
    shiftBy(length) {
        return this.buffer.splice(0, length);
    }
    unshiftEvents(eventsPacket) {
        this.buffer.splice(0, 0, ...eventsPacket);
    }
    flush() {
        this.buffer = [];
        this.first = null;
        this.last = null;
        this.firstTs = 0;
        this.lastTs = 0;
    }
    get length() {
        return this.buffer.length;
    }
    // Greatest index of a value less than the specified
    findIndexOfNearestSmaller(virtualTime) {
        const { buffer: rb } = this;
        if (!rb.length) {
            return -1;
        }
        return findIndexOfNearestSmaller(rb, virtualTime);
    }
}
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