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Better tracking of cached data, only load data if needed

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This commit is contained in:
Pieter Vander Vennet 2021-09-30 04:13:23 +02:00
parent 32cbd6e2c1
commit 4f456e8a7f
13 changed files with 349 additions and 185 deletions
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26
Logic/FeatureSource/Actors/SaveTileToLocalStorageActor.ts
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@ -7,28 +7,30 @@ import {FeatureSourceForLayer} from "../FeatureSource";
export default class SaveTileToLocalStorageActor {
public static readonly storageKey: string = "cached-features";
public static readonly formatVersion : string = "1"
public static readonly formatVersion: string = "1"
constructor(source: FeatureSourceForLayer, tileIndex: number) {
source.features.addCallbackAndRunD(features => {
const key = `${SaveTileToLocalStorageActor.storageKey}-${source.layer.layerDef.id}-${tileIndex}`
const now = new Date().getTime()
if (features.length == 0) {
return;
}
const now = new Date()
try {
localStorage.setItem(key, JSON.stringify(features));
localStorage.setItem(key + "-time", JSON.stringify(now))
localStorage.setItem(key+"-format", SaveTileToLocalStorageActor.formatVersion)
if (features.length > 0) {
localStorage.setItem(key, JSON.stringify(features));
}
// We _still_ write the time to know that this tile is empty!
SaveTileToLocalStorageActor.MarkVisited(source.layer.layerDef.id, tileIndex, now)
} catch (e) {
console.warn("Could not save the features to local storage:", e)
}
})
}
public static MarkVisited(layerId: string, tileId: number, freshness: Date){
const key = `${SaveTileToLocalStorageActor.storageKey}-${layerId}-${tileId}`
localStorage.setItem(key + "-time", JSON.stringify(freshness.getTime()))
localStorage.setItem(key + "-format", SaveTileToLocalStorageActor.formatVersion)
}
}