CacheRemote.kt

mWeekService.getCachedLessons() // From Cache
.doFinally(() -> {
    mWeekService.getLessons() // From Network
        .subscribeOn(Schedulers.io())
        .observeOn(AndroidSchedulers.mainThread())
        .map(new Function<WeekResponse, List<WeekModel>>() {
            @Override
            public List<WeekModel> apply(
                @io.reactivex.annotations.NonNull final WeekResponse response)
            throws Exception {
                return response.getResult();
            }

        })
        .subscribe(new Consumer<List<WeekModel>>() {
            @Override
            public void accept(
                @io.reactivex.annotations.NonNull final List<WeekModel> lessonList)
            throws Exception {

                mLessons.addAll(lessonList);
                mWeekAdapter.set(mDataList);
            }

        })
    );
})
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.map(new Function<WeekResponse, List<WeekModel>>() {
    @Override
    public List<WeekModel> apply(
        @io.reactivex.annotations.NonNull final WeekResponse response)
    throws Exception {
        return response.getResult();
    }

})
.subscribe(new Consumer<List<WeekModel>>() {
    @Override
    public void accept(
        @io.reactivex.annotations.NonNull final List<WeekModel> lessonList)
    throws Exception {

        mLessons.addAll(lessonList);
        mWeekAdapter.set(mDataList);
    }

})
);