CODEWITHSUNDEEP
androidrx-javarx-android
Tim
Tim

Reputation: 1606

Repeat request by Retrofit and Rx

I have API that returns the data by page, something like this:

{
   "count": 100,
   "offset": 0,
   "limit": 25,
   "result": [{}, {}, {}...]
}

I need to get all pages - All data (to execute queries with a different "offset":). 

      Observable<MyResponse> call = RetrofitProvider.get().create(MyApi.class).getData(0, 25); // limit and offset
    call.observeOn(AndroidSchedulers.mainThread())
            .subscribeOn(Schedulers.newThread())
            .doOnNext(<saving data>)
            .subscribe(result -> {                   
            }, error -> {             
            });

I'm trying to use RxAndroid and Retrofit. What is the best way this?

Upvotes: 1

Views: 1487

Answers (2)

cyroxis
cyroxis

Reputation: 3711

You can use a publish subject as your source observable, then you keep adding new requests for the next range dynamically.

private Observable<ApiResponse> getData(int start, int end) {
    // Get your API response value
    return RetrofitProvider.get().create(MyApi.class).getData(0, 25);
}

public Observable<ApiResponse> getAllData() {
    final PublishSubject<ApiResponse> subject = PublishSubject.create();
    return subject.doOnSubscribe(new Action0() {
        @Override
        public void call() {
            getData(0, SECTION_SIZE).subscribe(subject);
        }
    }).doOnNext(new Action1<ApiResponse>() {
        @Override
        public void call(ApiResponse apiResponse) {
            if (apiResponse.isFinalResultSet()) {
                subject.onCompleted();
            } else {
                int nextStartValue = apiResponse.getFinalValue() + 1;
                getData(nextStartValue, nextStartValue + SECTION_SIZE).subscribe(subject);
            }
        }
    });
}

Upvotes: 2

JohnWowUs
JohnWowUs

Reputation: 3083

If you know what the count is going to be you can do something like

Observable<MyResponse> call = Observable.empty();
for (int i=0 ; i<count ; i+=25) { 
    call.concatWith(RetrofitProvider.get().create(MyApi.class).getData(i, i+25));
}

Upvotes: 0

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