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sequentialize updates

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This commit is contained in:
Kyle Spearrin
2018-07-23 14:42:37 -04:00
parent c7e8f1d13f
commit 003c730eb1
3 changed files with 11 additions and 19 deletions
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27
src/misc/sequentialize.ts
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@@ -9,42 +9,35 @@
export function sequentialize(key: (args: any[]) => string = JSON.stringify) {
return (target: any, propertyKey: string | symbol, descriptor: PropertyDescriptor) => {
const originalMethod: () => Promise<any> = descriptor.value;
const caches = new Map<any, Map<string, Promise<any>>>();
const getCache = (obj: any) => {
let cache = caches.get(obj);
if (cache) {
if (cache != null) {
return cache;
}
cache = new Map<string, Promise<any>>();
caches.set(obj, cache);
return cache;
};
return {
value: function(...args: any[]) {
value: (...args: any[]) => {
const argsKey = key(args);
const cache = getCache(this);
let res = cache.get(argsKey);
if (res) {
if (res != null) {
return res;
}
res = originalMethod.apply(this, args)
.then((val: any) => {
cache.delete(argsKey);
res = originalMethod.apply(this, args).then((val: any) => {
cache.delete(argsKey);
return val;
}).catch((err: any) => {
cache.delete(argsKey);
throw err;
});
return val;
})
.catch((err: any) => {
cache.delete(argsKey);
throw err;
});
cache.set(argsKey, res);
return res;
},
};