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fix: race condition in declaration-data.js

main
Henrik 2023-07-20 22:42:49 +02:00
parent 9af4c720f0
commit 5ce54e8e10
1 changed files with 25 additions and 17 deletions
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42
static/declaration-data.js
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@ -25,6 +25,7 @@ export class DeclarationDataCenter {
* Used to implement the singleton, in case we need to fetch data mutiple times in the same page.
*/
static singleton = null;
static requestSingleton = null;
/**
* Construct a DeclarationDataCenter with given data.
@ -41,28 +42,35 @@ export class DeclarationDataCenter {
* @returns {Promise<DeclarationDataCenter>}
*/
static async init() {
if (!DeclarationDataCenter.singleton) {
const dataListUrl = new URL(
`${SITE_ROOT}/declarations/declaration-data.bmp`,
window.location
);
// try to use cache first
const data = await fetchCachedDeclarationData().catch(_e => null);
if (data) {
// if data is defined, use the cached one.
DeclarationDataCenter.singleton = new DeclarationDataCenter(data);
} else {
// undefined. then fetch the data from the server.
const dataListRes = await fetch(dataListUrl);
const data = await dataListRes.json();
await cacheDeclarationData(data);
DeclarationDataCenter.singleton = new DeclarationDataCenter(data);
if (DeclarationDataCenter.singleton === null) {
if (DeclarationDataCenter.requestSingleton === null) {
DeclarationDataCenter.requestSingleton = DeclarationDataCenter.getData();
}
await DeclarationDataCenter.requestSingleton;
}
return DeclarationDataCenter.singleton;
}
static async getData() {
const dataListUrl = new URL(
`${SITE_ROOT}/declarations/declaration-data.bmp`,
window.location
);
// try to use cache first
const data = await fetchCachedDeclarationData().catch(_e => null);
if (data) {
// if data is defined, use the cached one.
DeclarationDataCenter.singleton = new DeclarationDataCenter(data);
} else {
// undefined. then fetch the data from the server.
const dataListRes = await fetch(dataListUrl);
const data = await dataListRes.json();
await cacheDeclarationData(data);
DeclarationDataCenter.singleton = new DeclarationDataCenter(data);
}
}
/**
* Search for a declaration.
* @returns {Array<any>}