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https://github.com/bilawalsidhu/gods-eye-view.git
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quanticsoul4772
ba292ce475
Recover aircraft ground-height sampling after backward wall-clock changes while preserving sampling budgets. Contribution by @quanticsoul4772.
63 lines
2.3 KiB
JavaScript
63 lines
2.3 KiB
JavaScript
import assert from 'node:assert/strict';
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import test from 'node:test';
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import * as Cesium from 'cesium';
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import { createGroundSnap } from './groundSnap.js';
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const groundFloor = {
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cachedMeshFloor: () => null,
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meshFloorPreferred: () => false,
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reportValidatedMeshFloorCell: () => {},
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};
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/** A viewer whose ground is a loaded 3D tileset, counting height samples. */
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function makeViewer() {
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const calls = { samples: 0 };
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const tileset = { show: true, tilesLoaded: true };
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return {
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calls,
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scene: {
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primitives: { length: 1, get: () => tileset },
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sampleHeight() {
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calls.samples += 1;
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return 1650;
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},
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globe: { getHeight: () => 1600 },
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},
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};
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}
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const atDenverAirport = Cesium.Cartesian3.fromDegrees(-104.6737, 39.8561, 0);
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test('a clock that steps back opens a new sample window instead of denying samples until it catches up', (t) => {
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t.mock.timers.enable({ apis: ['Date'], now: 1_000_000 });
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const viewer = makeViewer();
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const snap = createGroundSnap({ groundFloor });
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const icaos = ['a00001', 'a00002', 'a00003', 'a00004', 'a00005', 'a00006'];
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for (const icao of icaos) snap.heightFor(viewer, icao, atDenverAirport);
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assert.equal(viewer.calls.samples, 4, 'four samples per 250 ms window');
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t.mock.timers.setTime(1_000_000 - 60_000);
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for (const icao of icaos) snap.heightFor(viewer, icao, atDenverAirport);
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assert.equal(
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viewer.calls.samples,
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6,
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'the two denied aircraft sample in the new window',
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);
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});
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test('a retry backoff stamped before the clock stepped back does not wait for it to catch up', (t) => {
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t.mock.timers.enable({ apis: ['Date'], now: 10_000_000 });
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const viewer = makeViewer();
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const tileset = viewer.scene.primitives.get(0);
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const snap = createGroundSnap({ groundFloor });
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// Tiles still streaming: a miss, backed off for 2 s.
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tileset.tilesLoaded = false;
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assert.equal(snap.heightFor(viewer, 'a00001', atDenverAirport), null);
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tileset.tilesLoaded = true;
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assert.equal(snap.heightFor(viewer, 'a00001', atDenverAirport), null);
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assert.equal(viewer.calls.samples, 0, 'the backoff holds');
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// The clock steps back an hour: the stamp is an hour off, past any backoff.
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t.mock.timers.setTime(10_000_000 - 3_600_000);
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assert.equal(snap.heightFor(viewer, 'a00001', atDenverAirport), 1650);
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assert.equal(viewer.calls.samples, 1);
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});
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