通过改造使 Observable 在 zip 运算符中可选

make Observable optional in zip operator with retrofit

我有一个带有改造的 Observable 调用压缩了三个 API 调用 但我想同时进行 3 个调用,但有时其中一个调用会失败,但我只有一个主调用,这对我来说是强制性的,其余调用是可选的,因为当其中一个调用失败时,它会出现错误,而我不想那样,我在想是否有 JoinObservable.when(OperatorJoinPatterns.or(call1 , call2 ) .then 但唯一的事情是

    Observable.zip(getSearchObservable(FIRST_PAGE), App.getApi().allbookmarks(), SpotlightUtil.getSpotLightBanner(), App.getApi().getFollowingSuggestions(AppConfigUtil.getFollowingSuggestions().getLimit()),
                (searchResult, myFavouritesResults, spotlightListResult, followingSuggestionsResult) -> combineCall(searchResult, myFavouritesResults, spotlightListResult, followingSuggestionsResult, false))
                .observeOn(AndroidSchedulers.mainThread())
                .doOnNext(spotlightsAndSearchResultAndSuggestionsResult -> {
//my main call that i want if that fail the request should fail 
                    if (!NetUtils.isServerOk(spotlightsAndSearchResultAndSuggestionsResult.getSearchResult().getStatus())) {
                        throw new ServerErrorException(spotlightsAndSearchResultAndSuggestionsResult.getSearchResult().getErrorMessage());
                    }

                    if (spotlightsAndSearchResultAndSuggestionsResult.getSearchResult().posts.size() < PAGE_SIZE) {
                        rvPosts.setFinished(true);
                    }
                    hideLoader();
                    mPostAdapter.mSuggestions = spotlightsAndSearchResultAndSuggestionsResult.getFollowingSuggestionsResult().getSuggestion();
                    checkToAddOrRemoveFeedbackSpotLight(spotlightsAndSearchResultAndSuggestionsResult.getSearchResult().posts, true);
                                    })
                .doOnError(throwable -> {
                    ErrorScreenUtils.checkError(throwable, this, true);
                    hideLoader();
                })
                .retryWhen(RxActivity.RETRY_CONDITION).compose(bindUntilEvent(FragmentEvent.DESTROY))
                .subscribe();

doOnError 不会阻止错误传播,因此它会破坏您的逻辑。

对于可选源,使用 onErrorResumeNextonErrorReturnItemonErrorReturn 运算符之一。您可以用可以成功 zipped:

的虚拟值替换错误
Observable.zip(
    source1,
    source2,
    optionalSource3.onErrorReturnItem(stub)
)
...