使用 RxJava 实现存储库模式 [英] Implementing Repository Pattern With RxJava

问题描述

我正在尝试找出一种更好的方法来实现类似 Android 中 RxJava 中的存储库模式.

I'm trying to figure out a better way to achieve something like repository pattern in RxJava in Android.

这是我到目前为止所拥有的:(从此处获取了一些代码)

Here's what I have so far: (took some code from here)

public Subscription getData(Observer<Data> observer, boolean refresh) {
    Subscription sub = null;

    Data cached = getCachedData();
    if(cached != null) {
        observer.onNext(cached);
        if(refresh) {
            sub = requestNetwork().subscribe(observer);
        } else {
            observer.onCompleted();
        }
    } else {
        sub = requestNetwork().subscribe(observer);
    }

    return sub;
}

基本上它会检查是否存储了缓存数据，如果没有，它会发出网络请求.它还有 refresh 布尔参数强制它总是发出网络请求.

Basically it check if there's cached data stored, if not it'll make a network request. It also have refresh boolean parameter force it always make a network request.

问题(或不是)是，这个函数的调用者需要调用它会收到 Subscription 而不是 Observable，我不能再链接了.

The problem (or not) is, the caller of this function needs to call it will receive Subscription instead of Observable, which I can't chain anymore.

有没有办法让函数返回 Observable 但仍然有存储库模式?

Is there a way to make the function return Observable but still have the repository pattern?

推荐答案

感谢 akarnokd 向我指出 这篇文章 作者:Dan Lew.

Thanks to akarnokd pointing me out to this article by Dan Lew.

我的最终代码:

public Observable<Data> getData(boolean refresh) {
    Observable<Data> obs = Observable.concat(getCache(), requestNetwork());
    if(!refresh) {
        obs = obs.first(data -> data != null);
    }
    return obs;
}

这篇关于使用 RxJava 实现存储库模式的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！