@actyx/sdk/lib/util/bufferOp.js

Actyx SDK

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.bufferOp = void 0;
const rxjs_1 = require("../../node_modules/rxjs");
const bufferOp = (bufferTimeSpan, maxBufferSize) => (source) => new rxjs_1.Observable((subscriber) => {
    let buffer = null;
    let timer = null;
    const maxBuf = maxBufferSize || Infinity;
    const startBuffer = (_b) => {
        if (buffer === null) {
            buffer = [];
            const sub = rxjs_1.asyncScheduler.schedule(emit, bufferTimeSpan);
            subscriber.add(sub);
            timer = sub;
        }
        return true;
    };
    const cancelTimer = () => {
        if (timer !== null) {
            timer.unsubscribe();
            subscriber.remove(timer);
            timer = null;
        }
    };
    const emit = () => {
        const b = buffer;
        buffer = null;
        if (b != null) {
            cancelTimer();
            subscriber.next(b);
        }
    };
    const sub = source.subscribe({
        next: (value) => {
            if (!startBuffer(buffer))
                return;
            buffer.push(value);
            if (buffer.length >= maxBuf)
                emit();
        },
        error: (err) => subscriber.error(err),
        complete: () => {
            emit();
            subscriber.complete();
        },
    });
    sub.add(() => subscriber.error(new Error('cancelled')));
    return sub;
});
exports.bufferOp = bufferOp;
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