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Back off if the toLoad queue is filling up..

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(re #6417)
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Bryan Housel
2019-05-24 09:44:35 -04:00
parent 43cd46f046
commit 0ded25885d
1 changed files with 7 additions and 1 deletions
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8
modules/services/osm.js
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@@ -870,13 +870,19 @@ export default {
// load the tile that covers the given `loc`
loadTileAtLoc: function(loc, callback) {
// Back off if the toLoad queue is filling up.. re #6417
// (Currently `loadTileAtLoc` requests are considered low priority - used by operations to
// let users safely edit geometries which extend to unloaded tiles. We can drop some.)
if (Object.keys(_tileCache.toLoad).length > 50) return;
var k = geoZoomToScale(_tileZoom + 1);
var offset = geoRawMercator().scale(k)(loc);
var projection = geoRawMercator().transform({ k: k, x: -offset[0], y: -offset[1] });
var tiles = tiler.zoomExtent([_tileZoom, _tileZoom]).getTiles(projection);
tiles.forEach(function(tile) {
if (_tileCache.toLoad[tile.id]) return; // already in queue
if (_tileCache.toLoad[tile.id] || _tileCache.loaded[tile.id] || _tileCache.inflight[tile.id]) return;
_tileCache.toLoad[tile.id] = true;
this.loadTile(tile, callback);
}, this);