ix/asynciterable/operators/publish.js

The Interactive Extensions for JavaScript

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.publish = void 0;
const tslib_1 = require("tslib");
const _refcountlist_js_1 = require("../../iterable/operators/_refcountlist.js");
const create_js_1 = require("../create.js");
const memoize_js_1 = require("./memoize.js");
const aborterror_js_1 = require("../../aborterror.js");
class PublishedAsyncBuffer extends memoize_js_1.MemoizeAsyncBuffer {
    constructor(source) {
        super(source, new _refcountlist_js_1.RefCountList(0));
    }
    [Symbol.asyncIterator](signal) {
        (0, aborterror_js_1.throwIfAborted)(signal);
        this._buffer.readerCount++;
        return this._getIterable(this._buffer.count)[Symbol.asyncIterator]();
    }
}
/**
 * Buffer enabling each iterator to retrieve elements from the shared source sequence, starting from the
 * index at the point of obtaining the iterator.
 *
 * @template TSource Source sequence element type.
 * @template TResult Result sequence element type.
 * @param {(value: AsyncIterable<TSource>) => AsyncIterable<TResult>} [selector] Selector function with published
 * access to the source sequence for each iterator.
 * @returns {(OperatorAsyncFunction<TSource, TSource | TResult>)} Sequence resulting from applying the selector function to the
 * published view over the source sequence.
 */
function publish(selector) {
    return function publishOperatorFunction(source) {
        return selector
            ? (0, create_js_1.create)(() => tslib_1.__awaiter(this, void 0, void 0, function* () { return selector(publish()(source))[Symbol.asyncIterator](); }))
            : new PublishedAsyncBuffer(source[Symbol.asyncIterator]());
    };
}
exports.publish = publish;

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