1
我试图使用RxJava
的takeUntil
运算符来实现优化的缓存和网络方法,以从服务器获取数据。我正在使用Gson模型来解析来自API的JSON响应。采用Retrofit,RxJava和Gson的最优化缓存和网络方法
由于使用Gson模型,我陷入从服务器检索数据的困境。因为返回的类型与Netwrok请求和磁盘缓存不匹配。
我一直在测试几种方法,但没有成功地把它做对。
ApiService.java
@GET(ApiConstants.GET_QUESTIONS_URL) Observable<RequestResponse> getQuestions();
ineteractor.java
public void performGetElQuestions(String query, QuestionsRequestServerCallback callback) {
getFreshNetworkData()//
.publish(network ->//
Observable.merge(network,//
getCachedDiskData().takeUntil(network)))
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new DisposableObserver<Question>() {
@Override
public void onComplete() {
callback.onQuestionsReady(mQuestionsList);
}
@Override
public void onError(Throwable e) {
callback.onQuestionsFailed();
}
@Override
public void onNext(Question question) {
// mQuestionsList is an arraylist
mQuestionsList.add(question);
}
});
interactor.java
private Observable<Question> getFreshNetworkData() {
return apiService.getQuestions()
.flatMap(Observable::fromIterable)
.doOnSubscribe((data) -> new Handler(Looper.getMainLooper())//
.post(() -> adapterSubscriptionInfo.add("(network) subscribed")))//
.doOnComplete(() -> new Handler(Looper.getMainLooper())//
.post(() -> adapterSubscriptionInfo.add("(network) completed")));
}
缓存数据
private Observable<Question> getCachedDiskData() {
List<Question> list = new ArrayList<>();
//get cached data from SQLite or disk
return Observable.fromIterable(list)//
.doOnSubscribe((data) -> new Handler(Looper.getMainLooper())//
.post(() -> Timber.d("(disk) cache subscribed")))//
.doOnComplete(() -> new Handler(Looper.getMainLooper())//
.post(() -> Timber.d("(disk) cache completed")));
}
GSON模型分析器
RequestResponse.java
Public class RequestResponse {
@SerializedName("questions")
ArrayList<Question> questions;
public ArrayList<Question> getQuestions() {
return questions;
}
}
谢谢:)。
什么是你从服务器得到JSON? – iagreen
嘿@iagreen,https://gist.github.com/alouanemed/65fb8069d15edfe1cc49dbe0973111f2 –
请显示错误stacktrace –