@tempest/core/lib/multicast/Multicast.js

The core of the Tempest Stream Library

import { addSink, removeSink, none } from './sink';
import { MulticastDisposable } from './MulticastDisposable';
const EMPTY = { dispose() { return void 0; } };
const NONE = null;
export class Multicast {
    constructor(source) {
        this.activeCount = 0;
        this.source = source;
        this.sink = none();
        this.disposable = EMPTY;
        this._stopId = NONE;
    }
    run(sink, scheduler) {
        const n = this._add(sink);
        if (n === 1) {
            if (this._stopId !== NONE) {
                scheduler.cancel(this._stopId);
                this._stopId = NONE;
            }
            if (this.disposable === EMPTY) {
                this.disposable = this.source.run(this, scheduler);
            }
        }
        return new MulticastDisposable(this, sink, scheduler);
    }
    _dispose() {
        const disposable = this.disposable;
        this.disposable = EMPTY;
        this._stopId = NONE;
        Promise.resolve(disposable).then(dispose);
    }
    _add(sink) {
        this.sink = addSink(sink, this.sink);
        this.activeCount += 1;
        return this.activeCount;
    }
    _remove(sink) {
        const s = this.sink;
        this.sink = removeSink(sink, this.sink);
        if (s !== this.sink) {
            this.activeCount -= 1;
        }
        return this.activeCount;
    }
    event(time, value) {
        this.sink.event(time, value);
    }
    end(time, value) {
        this.sink.end(time, value);
    }
    error(time, err) {
        this.sink.error(time, err);
    }
}
function dispose(disposable) {
    disposable.dispose();
}
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