web-svelte => web

packages/web/src/utility/cache.ts

@@ -0,0 +1,40 @@
+import getAsArray from './getAsArray';
+
+let cachedByKey = {};
+let cachedPromisesByKey = {};
+const cachedKeysByReloadTrigger = {};
+
+export function cacheGet(key) {
+  return cachedByKey[key];
+}
+
+export function cacheSet(key, value, reloadTrigger) {
+  cachedByKey[key] = value;
+  for (const item of getAsArray(reloadTrigger)) {
+    if (!(item in cachedKeysByReloadTrigger)) {
+      cachedKeysByReloadTrigger[item] = [];
+    }
+    cachedKeysByReloadTrigger[item].push(key);
+  }
+  delete cachedPromisesByKey[key];
+}
+
+export function cacheClean(reloadTrigger) {
+  for (const item of getAsArray(reloadTrigger)) {
+    const keys = cachedKeysByReloadTrigger[item];
+    if (keys) {
+      for (const key of keys) {
+        delete cachedByKey[key];
+        delete cachedPromisesByKey[key];
+      }
+    }
+    delete cachedKeysByReloadTrigger[item];
+  }
+}
+
+export function getCachedPromise(key, func) {
+  if (key in cachedPromisesByKey) return cachedPromisesByKey[key];
+  const promise = func();
+  cachedPromisesByKey[key] = promise;
+  return promise;
+}