[英]Asynchronous read / write to Realm using RXJava 2
我第一次使用RXJava 2
实现异步操作
目标:
使用Retrofit2
库从服务器获取json
数据。 如果成功,则将数据写入Realm
并在记录之后立即取回数据并将其发送到RecyclerView
的适配器。
因此,我以这种方式意识到了这一切:
private void fetchChatsFromNetwork(int count, AccessDataModel accessDataModel) {
String accessToken = accessDataModel.getAccessToken();
MyApplication.getRestApi().getChats(count, accessToken, Constants.api_version)
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribeWith(new DisposableSubscriber<ChatsModel>() {
@Override
public void onNext(ChatsModel chatsModel) {
if (chatsRepository.hasData()) {
chatsRepository.updateChatsData(chatsModel)
.subscribe(new DisposableObserver<ChatsModel>() {
@Override
public void onNext(ChatsModel localChatsModel) {
Log.d(TAG, "DO, onSuccess updated!");
iGetChatsCallback.onGetChatsSuccess(localChatsModel);
}
@Override
public void onError(Throwable e) {
Log.d(TAG, "DO, onError when update!");
iGetChatsCallback.onGetChatsError(e.getMessage());
}
@Override
public void onComplete() {
dispose();
Log.d(TAG, "DO, onComplete!");
}
});
} else {
chatsRepository.insertChatsData(chatsModel)
.subscribe(new DisposableObserver<ChatsModel>() {
@Override
public void onNext(ChatsModel localChatsModel) {
iGetChatsCallback.onGetChatsSuccess(localChatsModel);
Log.d(TAG, "DO, onSuccess inserted!");
}
@Override
public void onError(Throwable e) {
iGetChatsCallback.onGetChatsError(e.getMessage());
Log.d(TAG, "DO, onError when inserting!");
}
@Override
public void onComplete() {
dispose();
Log.d(TAG, "DO, onComplete!");
}
});
}
}
@Override
public void onError(Throwable t) {
Log.d(TAG, "onError" + t.getMessage());
}
@Override
public void onComplete() {
Log.d(TAG, "onComplete");
}
});
}
我在订阅者MyApplication.getRestApi().GetChats()
的onNext()
方法中将数据写入Realm
中MyApplication.getRestApi().GetChats()
这是输入代码:
public Observable<ChatsModel> updateChatsData(final ChatsModel chatsModel) {
return Observable.create(new ObservableOnSubscribe<ChatsModel>() {
@Override
public void subscribe(ObservableEmitter<ChatsModel> e) throws Exception {
if (chatsModel != null) {
realm.executeTransactionAsync(
realm -> realm.copyToRealmOrUpdate(chatsModel),
() -> {
Log.d(LOG_TAG, "Data success updated!");
ChatsModel localChatsModel = getAllChatsData();
e.onNext(localChatsModel);
e.onComplete();
},
error -> {
Log.d(LOG_TAG, "Update data failed!");
e.onError(error);
});
}
}
});
}
updateChatsData()
异步编写并在另一个类中声明。
如您所见, fetchChatsFromNetwork()
方法的编写很繁琐,所以在我看来
题:
我是否做对了,如果做错了,那将是正确的吗?
private void fetchChatsFromNetwork(int count, AccessDataModel accessDataModel) {
String accessToken = accessDataModel.getAccessToken();
Single<ChatsModel> chats = MyApplication.getRestApi().getChats(count, accessToken, Constants.api_version);
chats.doOnNext((chats) -> {
chatsRepository.insertOrUpdate(chats);
}).subscribeOn(Schedulers.io())
.subscribe();
}
和
public void updateChatsData(final ChatsModel chatsModel) {
try(Realm realm = Realm.getDefaultInstance()) {
realm.executeTransaction(r -> {
r.insertOrUpdate(chatsModel);
});
}
}
和
public Flowable<List<ChatsModel>> getAllChatsData(Realm realm) {
RealmQuery<ChatsModel> query = realm.where(ChatsModel.class);
if(realm.isAutoRefresh()) {
return query.findAllAsync().asFlowable().filter(RealmResults::isLoaded);
} else {
return Flowable.just(query.findAll());
}
}
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