如何将可观察的错误转换为另一个可观察的错误?
我正在尝试实现以下方案中显示的算法:
我正在使用一个名为Grokking RxJava的教程来开始我的学习,发现flatMap运算符可以将一个Obtrable转换为另一个Obtrable转换为另一个允许我对服务器方法进行调用的链。但是在教程链接方法中总是返回成功结果。 如果其中一个远程方法返回错误,我如何进行相同的链接?
目前,我使用的方法对我来说很奇怪且不清楚:
AppObservable.bindActivity(this, userService.checklogin(mPhone)
.onErrorResumeNext(new Func1<Throwable, Observable<? extends Response>>() {
@Override
public Observable<? extends Response> call(Throwable throwable) {
return Observable.just(null);
}
}))
.flatMap(new Func1<Response, Observable<Response>>() {
@Override
public Observable<Response> call(Response response) {
if (response == null) {
return AppObservable.bindActivity(RegistrationActivity.this, userService.register(
mPhone,
name.getText().toString(),
selectedSex,
selectedDateDay,
selectedDateMonth,
selectedDateYear,
Locale.getDefault().getLanguage(),
persistentUserInfoStore.getInstallationToken()
));
}
phone.setError(getString(R.string.already_registered_phone));
progressDialog.dismiss();
return Observable.empty();
}
})
.subscribe(new Action1<Response>() {
@Override
public void call(Response response) {
startConfirmationActivity();
progressDialog.dismiss();
}
}, new Action1<Throwable>() {
@Override
public void call(Throwable throwable) {
progressDialog.dismiss();
Toast.makeText(RegistrationActivity.this, "Error while register user", Toast.LENGTH_SHORT).show();
}
});
有没有更明确的方法来做到这一点。
P.S。我是RxJava的新手。
答案 0 :(得分:5)
userService.register
onErrorResumeNext
Exception
类。这就是它在代码中的样子:
userService.checkLogin(mPhone).flatMap(new Func1<Response, Observable<Response>() {
@Override
public Observable<? extends Response> call(final Response response) {
// according to your diagram the whole Observable should fail if first call was successful
return Observable.error(new FirstCallWasSuccessfulException(response));
}
}).onErrorResumeNext(new Func1<Throwable, Observable<? extends Response>>() {
@Override
public Observable<? extends Response> call(final Throwable throwable) {
if (throwable instanceof FirstCallWasSuccessfulException) {
return Observable.error(throwable);
}
return userService.register(...);
}
}).subscribe(new Subscriber<Response>() {
@Override
public void onError(final Throwable throwable) {
if (throwable instanceof FirstCallWasSuccessfulException) {
// foo
} else {
// bar
}
}
@Override
public void onNext(final Response response) {
}
@Override
public void onCompleted() {
}
});