android rxjava2/retrofit2 使用分页令牌链接调用 [英] android rxjava2/retrofit2 chaining calls with pagination token

问题描述

我正在使用 REST API 来查询 Person 对象列表.最大限制为 100 人响应.我需要把所有的人都拉过来，总金额不详.第一个响应中有一个名为next"的字段，包含下一页的 url.我需要使用 RxJava/RxAndroid 和 Retrofit 链接这些调用，直到最后一个响应有一个空的下一个"字段.由于next"字段包含分页网址，因此所有后续调用都将具有与第一个不同的网址.这样做最方便的方法是什么?

I'm using a REST API to query for a list of Person objects. Max limit is 100 people in response. I need to fetch all people, and the total amount is unknown. There is a field in the first response called "next", containing url for the next page. I need to chain these calls using RxJava/RxAndroid and Retrofit until the last response has an empty "next" field. Since the "next" field contains a pagination url, all subsequent calls will have different url from the first one. What is the most convenient way to do this?

推荐答案

与此类似的事情会起作用(有点笼统):

Something similar to this would work (a bit generalized):

public Observable<Response> paginate(String initialUrl){
    AtomicReference<String> url = new AtomicReference<>(initialUrl)
    return Observable.defer(() -> api.loadUsers(url.get())
                      .doOnNext(response -> url.set(response.next))
                      .repeatWhen(r -> r.takeWhile(!url.get().isEmpty()));
}

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