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Angular Http Caching and Race Conditions


By : robert furst
Date : October 17 2020, 08:10 AM
like below fixes the issue As already suggested in the comments you can create a method that will call the service return a replay Observable like this:
code :
public getGenres(): Observable<Genre> {
  return this.httpClient.get('api/genres').pipe(
    shareReplay(1)
  );
}
const genres$ = this.getGenres();
// GetBooksResolver:
forkJoin(genres$, this.http.get('api/books'))
    .pipe(map(data => //merge datasets));

//GetAuthorsResolver
forkJoin(genres$, this.http.get('api/authors'))
    .pipe(map(data => //merge datasets));


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Does a singleton pattern in an HTTP client class cause race conditions?


By : Vlad Suru
Date : March 29 2020, 07:55 AM
this one helps. Since PHP is not multithreaded, this alone shouldn't be able to cause a race condition.
It would be possible if there are multiple requests at the same time and you're using a shared resource (e.g. a file on your server). In that case you would need to have proper locking in place, such as flock().

Redis caching - how to avoid race conditions?


By : rcain
Date : March 29 2020, 07:55 AM
I hope this helps . In the case where the PUT puts the fresh data in the cache at the same time as it puts it in the database (write-through cache), you can use SET / HSET when writing to the cache from your PUT, and SETNX / HSETNX when writing to the cache from your GET. Since the GET is only going to write to the cache if the key doesn't exist, normally a SETNX will succeed. But if someone else (possibly a PUT) came along and set the key in the meantime, the SETNX will fail because the key already exists, and you'll get the result you want.
In the case where the PUT just deletes the data in cache to be repopulated by the next GET, I don't think you can provide any better guarantee than you already have. The data will live for one expiration time after it was retrieved from the database, which isn't strictly wrong, it's just worse than you would like.

Are race conditions possible in Angular 4


By : Mateo Cortes
Date : March 29 2020, 07:55 AM
seems to work fine Assuming there's no asynchronous code in calculate, the method will always run to completion before being called again.
It's not possible for 2 separate "instances" of calculate to run simultaneously.

Avoiding race conditions in Angular 8


By : user3212134
Date : March 29 2020, 07:55 AM
I wish did fix the issue. Have a look to switchMap operator. It is designed to ignore last HTTP call if a new one is triggered.
Here is an exemple to autocomplete an input from wikipedia pages:
code :
this.userInputEvent$.pipe(
                    debounceTime(300), // waits 300ms before calling server, to do only one call when user stops typing
                    distinctUntilChanged(), // do not call server if input did not change since last call
                    switchMap((term: string) => this.wikipediaService.search(term)) // switchs the user-input observable to an http call observable depending on the user input. Ignores last call if a new one is triggered before last one is received.
                ).subscribe(httpResults => this.items = httpResults);

CUDA kernel function seems to show race conditions despite racecheck showing 0 race conditions


By : hero.ng
Date : March 29 2020, 07:55 AM
hop of those help? Your code has a global memory race, but cuda-memcheck won't detect it. Quoting from the documentation:
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