Rxjava - How to retry an API call with different params while calling two APIs in parallel

Question

I am making two API calls in the following way. If any of the two API calls fail, I would want to retry that API by changing certain params. How to achieve this?

Single.zip(API1.subscribeOn(Schedulers.io()),
                API2.subscribeOn(Schedulers.io()), Bifunction())).subscribe();

Answer 1

U can use onErrorResumeNext to handle ur scenario here. For both the API calls add a onErrorResumeBlock which could be retrying the same api with diff params. Like:

Single.zip(API1.subscribeOn(Schedulers.io())
     .onErrorResumeNext { throwable:Throwable ->
     return@onErrorResumeNext API1DIFF_PARAMS },
     API2.subscribeOn(Schedulers.io())
     .onErrorResumeNext { throwable:Throwable ->
     return@onErrorResumeNext API2DIFF_PARAMS }, Bifunction())).subscribe();

Downside is this will work only once. If your second API also fails then it will land in the error block of ur subscribe method