@benev/slate/x/signals/parts/tracker.js

frontend web stuff

import { accessed } from "./accessed_symbol.js";
import { debounce } from "../../tools/debounce/debounce.js";
export class SignalTracker {
    #active = true;
    #all_signals;
    #waiters;
    #relevant_signals = new Set();
    #stoppers = new Set();
    constructor({ all_signals, waiters, }) {
        this.#all_signals = all_signals;
        this.#waiters = waiters;
    }
    #actuate = debounce(0, (track) => {
        if (this.#active) {
            if ("lean" in track)
                track.actor();
            else {
                const { payload, recording } = this.observe(track.collector);
                this.add_listeners(track, recording);
                if (track.responder)
                    track.responder(payload);
            }
        }
    });
    #reset_all_signals_accessed_indicator() {
        for (const signal of this.#all_signals)
            signal[accessed] = false;
    }
    get #signals_that_should_be_tracked() {
        return [...this.#all_signals].filter(signal => (signal[accessed] &&
            !this.#relevant_signals.has(signal)));
    }
    observe(collector) {
        this.#reset_all_signals_accessed_indicator();
        const payload = collector();
        return {
            payload,
            recording: this.#signals_that_should_be_tracked,
        };
    }
    add_listeners(track, recording) {
        for (const signal of recording) {
            this.#relevant_signals.add(signal);
            this.#stoppers.add(signal.on(() => this.#waiters.add(this.#actuate(track))));
        }
    }
    shutdown() {
        this.#active = false;
        this.#stoppers.forEach(stop => stop());
    }
}
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