ix/asynciterable/operators/buffercountortime.js

The Interactive Extensions for JavaScript

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.bufferCountOrTime = void 0;
const tslib_1 = require("tslib");
const index_js_1 = require("../index.js");
const map_js_1 = require("./map.js");
const merge_js_1 = require("../merge.js");
const withabort_js_1 = require("./withabort.js");
const timerEvent = {};
const ended = {};
class BufferCountOrTime extends index_js_1.AsyncIterableX {
    constructor(source, bufferSize, maxWaitTime) {
        super();
        this.source = source;
        this.bufferSize = bufferSize;
        this.maxWaitTime = maxWaitTime;
    }
    [Symbol.asyncIterator](signal) {
        return tslib_1.__asyncGenerator(this, arguments, function* _a() {
            var _b, e_1, _c, _d;
            const buffer = [];
            const timer = (0, index_js_1.interval)(this.maxWaitTime).pipe((0, map_js_1.map)(() => timerEvent));
            const source = (0, index_js_1.concat)(this.source, (0, index_js_1.of)(ended));
            const merged = (0, merge_js_1.merge)(source, timer);
            try {
                for (var _e = true, _f = tslib_1.__asyncValues((0, withabort_js_1.wrapWithAbort)(merged, signal)), _g; _g = yield tslib_1.__await(_f.next()), _b = _g.done, !_b; _e = true) {
                    _d = _g.value;
                    _e = false;
                    const item = _d;
                    if (item === ended) {
                        break;
                    }
                    if (item !== timerEvent) {
                        buffer.push(item);
                    }
                    if (buffer.length >= this.bufferSize || (buffer.length && item === timerEvent)) {
                        yield yield tslib_1.__await(buffer.slice());
                        buffer.length = 0;
                    }
                }
            }
            catch (e_1_1) { e_1 = { error: e_1_1 }; }
            finally {
                try {
                    if (!_e && !_b && (_c = _f.return)) yield tslib_1.__await(_c.call(_f));
                }
                finally { if (e_1) throw e_1.error; }
            }
            if (buffer.length) {
                yield yield tslib_1.__await(buffer);
            }
        });
    }
}
/**
 * Projects each element of an async-iterable sequence into consecutive buffers
 * which are emitted when either the threshold count or time is met.
 *
 * @template TSource The type of elements in the source sequence.
 * @param {number} count The size of the buffer.
 * @param {number} time The threshold number of milliseconds to wait before flushing a non-full buffer
 * @returns {OperatorAsyncFunction<TSource, TSource[]>} An operator which returns an async-iterable sequence
 * of buffers
 */
function bufferCountOrTime(count, time) {
    return function bufferOperatorFunction(source) {
        return new BufferCountOrTime(source, count, time);
    };
}
exports.bufferCountOrTime = bufferCountOrTime;

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