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WIP: use indexedDB as datastore for geotiles

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This commit is contained in:
Pieter Vander Vennet 2021-11-15 11:51:32 +01:00
parent b5693304f2
commit 8fa7de661e
9 changed files with 99 additions and 65 deletions
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65
Logic/FeatureSource/Actors/SaveTileToLocalStorageActor.ts
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@ -3,56 +3,49 @@
*
* Technically, more an Actor then a featuresource, but it fits more neatly this ay
*/
import {FeatureSourceForLayer} from "../FeatureSource";
import FeatureSource, {Tiled} from "../FeatureSource";
import {Tiles} from "../../../Models/TileRange";
import {IdbLocalStorage} from "../../Web/IdbLocalStorage";
import {UIEventSource} from "../../UIEventSource";
export default class SaveTileToLocalStorageActor {
public static readonly storageKey: string = "cached-features";
public static readonly formatVersion: string = "2"
private readonly visitedTiles: UIEventSource<Map<number, Date>>
private readonly _layerId: string;
static storageKey: string = "";
constructor(source: FeatureSourceForLayer, tileIndex: number) {
constructor(layerId: string) {
this._layerId = layerId;
this.visitedTiles = IdbLocalStorage.Get("visited_tiles_" + layerId,
{defaultValue: new Map<number, Date>(), })
}
source.features.addCallbackAndRunD(features => {
const key = `${SaveTileToLocalStorageActor.storageKey}-${source.layer.layerDef.id}-${tileIndex}`
public loadAvailableTiles(){
this.visitedTiles.addCallbackAndRunD()
}
public addTile(tile: FeatureSource & Tiled){
tile.features.addCallbackAndRunD(features => {
const now = new Date()
try {
if (features.length > 0) {
localStorage.setItem(key, JSON.stringify(features));
}
// We _still_ write the time to know that this tile is empty!
SaveTileToLocalStorageActor.MarkVisited(source.layer.layerDef.id, tileIndex, now)
} catch (e) {
console.warn("Could not save the features to local storage:", e)
if (features.length > 0) {
IdbLocalStorage.SetDirectly(this._layerId+"_"+tile.tileIndex, features)
}
// We _still_ write the time to know that this tile is empty!
this.MarkVisited(tile.tileIndex, now)
})
}
public static MarkVisited(layerId: string, tileId: number, freshness: Date) {
const key = `${SaveTileToLocalStorageActor.storageKey}-${layerId}-${tileId}`
try {
localStorage.setItem(key + "-time", JSON.stringify(freshness.getTime()))
localStorage.setItem(key + "-format", SaveTileToLocalStorageActor.formatVersion)
} catch (e) {
console.error("Could not mark tile ", key, "as visited")
}
}
public static poison(layers: string[], lon: number, lat: number) {
public poison(lon: number, lat: number) {
for (let z = 0; z < 25; z++) {
const {x, y} = Tiles.embedded_tile(lat, lon, z)
const tileId = Tiles.tile_index(z, x, y)
for (const layerId of layers) {
const key = `${SaveTileToLocalStorageActor.storageKey}-${layerId}-${tileId}`
localStorage.removeItem(key + "-time");
localStorage.removeItem(key + "-format")
localStorage.removeItem(key)
}
this.visitedTiles.data.delete(tileId)
}
}
public MarkVisited(tileId: number, freshness: Date) {
this.visitedTiles.data.set(tileId, freshness)
this.visitedTiles.ping()
}
}