Layer Query with timout and maxResults

[SebastianKrings]

Hi,

we are performing spatial queries on multiple feature layers at once. At some cases the given geometry is pretty big and causes performance issues.

I am looking for a way to limit the query in time or amount instead of waiting til end or aborting it at al.

This is my current code:

const bufferGeometry = bufferOperator.execute(centerFeature.geometry!, 200, { unit: "meters"});
const bufferSearchResult = await Promise.all(searchLayers.map((l: FeatureLayer) => {
	const query = l.createQuery();
	query.geometry = bufferGeometry
	return l.queryFeatures(query);
}))

I could make a timeout on the promise, but that way I am not getting any result at all.
I could limit the results after the query has finisehd but this needs the query to fully perform.
Both is not suitable for us.

Best case we are looking for can:
- limit the query running in time and return all results found so far
- limit the query running by a maximum of results and return as soon as the maximum is reached

Hope to see some ideas, thanks.

[SebastianKrings · Accepted solution]

Just found the num-property which does exactly what I was looking for, limiting the number of results and (hopefully) breaking the seach.

This indirectly affects the runtime, so a limitation over time may be optional.

Full code:

const bufferGeometry = bufferOperator.execute(centerFeature.geometry!, 200, { unit: "meters"});
const bufferSearchResult = await Promise.all(searchLayers.map((l: FeatureLayer) => {
	const query = l.createQuery();
	query.geometry = bufferGeometry;
	return l.queryFeatures(query);
}))

[YannCabon]

Hi Sebastian,

If possible, instead of creating a buffer geometry yourself, use the Query.distance and Query.unit to send the buffer parameters to the server and let it do it.