130 lines
3.7 KiB
TypeScript
130 lines
3.7 KiB
TypeScript
//---------------------------------------------------------------------------
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// @syndicate-lang/core, an implementation of Syndicate dataspaces for JS.
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// Copyright (C) 2016-2021 Tony Garnock-Jones <tonyg@leastfixedpoint.com>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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//---------------------------------------------------------------------------
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import { Dataspace, Script } from './dataspace.js';
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export type StopHandler<D extends Dataspace> = (ds: D) => void;
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declare global {
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interface Window {
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_ground: Ground;
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}
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}
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export class Ground extends Dataspace {
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stepScheduled = false;
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stepping = false;
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startingFuel: number = 1000;
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stopHandlers: Array<StopHandler<this>> = [];
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backgroundTaskCount = 0;
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constructor(bootProc: Script<void>) {
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super(function (rootFacet) { rootFacet.addStartScript(bootProc); });
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if (typeof window !== 'undefined') {
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window._ground = this;
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}
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}
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static laterCall(thunk: () => void): void {
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queueMicrotask(() => {
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if ('stackTraceLimit' in Error) {
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(Error as any).stackTraceLimit = 100;
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}
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try {
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thunk();
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} catch (e) {
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console.error("SYNDICATE/JS INTERNAL ERROR", e);
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}
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});
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}
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backgroundTask(): () => void {
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let active = true;
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this.backgroundTaskCount++;
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return () => {
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if (active) {
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this.backgroundTaskCount--;
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active = false;
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}
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};
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}
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start(): this {
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if (!this.stepScheduled) {
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Ground.laterCall(() => {
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this.stepScheduled = false;
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this._step();
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});
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}
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return this; // allows chaining start() immediately after construction
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}
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ground(): Ground {
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return this;
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}
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_step() {
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this.stepping = true;
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try {
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let stillBusy = false;
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for (var fuel = this.startingFuel; fuel > 0; fuel--) {
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stillBusy = this.runTasks();
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if (!stillBusy) break;
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}
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if (stillBusy) {
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this.start();
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} else {
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if (!this.backgroundTaskCount) {
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this.stopHandlers.forEach((h) => h(this));
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this.stopHandlers = [];
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}
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}
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} finally {
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this.stepping = false;
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}
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}
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addStopHandler(h: StopHandler<this>): this {
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this.stopHandlers.push(h);
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return this;
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}
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}
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// let g = new Ground(() => {
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// Worker.spawnWorkerRelay();
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// });
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// if (typeof document !== 'undefined') {
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// document.addEventListener("DOMContentLoaded", () => {
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// g.start();
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// if (k) k(g);
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// });
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// } else {
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// g.start();
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// if (k) k(g);
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// }
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export function bootModule(bootProc: Script<void>): Ground {
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const g = new Ground(bootProc);
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if (typeof document !== 'undefined') {
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document.addEventListener('DOMContentLoaded', () => g.start());
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} else {
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g.start();
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}
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return g;
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}
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