Add caching into local storage for a faster map experience

Logic/FeatureSource/FeaturePipeline.ts

@@ -0,0 +1,48 @@
+import FilteringFeatureSource from "../FeatureSource/FilteringFeatureSource";
+import State from "../../State";
+import FeatureSourceMerger from "../FeatureSource/FeatureSourceMerger";
+import RememberingSource from "../FeatureSource/RememberingSource";
+import WayHandlingApplyingFeatureSource from "../FeatureSource/WayHandlingApplyingFeatureSource";
+import NoOverlapSource from "../FeatureSource/NoOverlapSource";
+import FeatureDuplicatorPerLayer from "../FeatureSource/FeatureDuplicatorPerLayer";
+import FeatureSource from "../FeatureSource/FeatureSource";
+import {UIEventSource} from "../UIEventSource";
+import LocalStorageSaver from "./LocalStorageSaver";
+import LayerConfig from "../../Customizations/JSON/LayerConfig";
+import LocalStorageSource from "./LocalStorageSource";
+
+export default class FeaturePipeline implements FeatureSource {
+
+    public features: UIEventSource<{ feature: any; freshness: Date }[]>;
+
+    constructor(flayers: { isDisplayed: UIEventSource<boolean>, layerDef: LayerConfig }[], updater: FeatureSource) {
+
+        const overpassSource = new WayHandlingApplyingFeatureSource(flayers,
+            new NoOverlapSource(flayers, new FeatureDuplicatorPerLayer(flayers, updater))
+        );
+
+        const amendedOverpassSource =
+            new RememberingSource(new LocalStorageSaver(
+                overpassSource
+            ));
+
+        const merged = new FeatureSourceMerger([
+            amendedOverpassSource,
+            new FeatureDuplicatorPerLayer(flayers, State.state.changes),
+            new LocalStorageSource()
+        ]);
+        merged.features.addCallbackAndRun(feats => console.log("Merged has",feats?.length))
+
+        const source =
+            new FilteringFeatureSource(
+                flayers,
+                State.state.locationControl,
+                merged
+            );
+        source.features.addCallbackAndRun(feats => console.log("Filtered has",feats?.length))
+
+
+        this.features = source.features;
+    }
+
+}