Retrofit-RxJava-Chain-Calls

retrofitService.getAccessToken()
	/* AuthenticationResponse is the return type of retrofitService.getAccessToken()
	 * Observable<ResponseBody> is the return type of retrofitService.getRecords(), I'm using retrofit response body here
	 */
    .flatMap(new Func1<AuthenticationResponse, Observable<ResponseBody>>() {
        @Override
        public Observable<ResponseBody> call(AuthenticationResponse authenticationResponse) {
            String accessToken = authenticationResponse.getData().getAccessToken();
            String refreshToken = authenticationResponse.getData().getRefreshToken();
            Authentication.saveDetails(accessToken, refreshToken);

            return retrofitService.getRecords();
        }
    })
    .subscribeOn(Schedulers.io())
    .unsubscribeOn(Schedulers.io())
    .observeOn(AndroidSchedulers.mainThread())
    .subscribe(new Subscriber<ResponseBody>() {
    @Override
    public void onCompleted() {
        //TODO 
    }

    @Override
    public void onError(Throwable e) {
        //TODO
    }

    @Override
    public void onNext(ResponseBody responseBody) {
        //TODO
    }
});