java - 如何终止一个 Observable？

Question

我有一个 Observable，如果不满足某个条件(即如果某个网站的响应不成功)，我想终止它，以便我可以重新查询该网站，并再次调用该 observable。我该怎么做？

这是我想做的:

Observable.create(new Observable.OnSubscribe<String>() {
    @Override
    public void call(Subscriber<? super String> subscriber) {

        //Perform network actions here

        if (!response.isSuccessful()) {
            //terminate this Observable so I can retrieve the token and call this observable again
        }
    }

});

Answer 1

您可以使用 retry Rx 的运算符。并且不需要终止一个 Observable。

定义了一个自定义异常:

public class FailedException extends RuntimeException{
    // ...
}


private static final int RETRY_COUNT = 3; // max retry counts
Observable.create(new Observable.OnSubscribe<String>() {
        @Override
        public void call(Subscriber<? super String> subscriber) {
            //Perform network actions here
            if (!response.isSuccessful()) {
                // if response is unsucceed, invoke onError method and it will be stop emit data and into retry method.
                subscriber.onError(new FailedException());
            }
        }

    })
    .retry((integer, throwable) -> {
        // Retry network actions when failed.
        // if return true, Observable will be retry to network actions emit data;
        // if return false, you can process in onError() method of Subscribe.
        return throwable instanceof FailedException && integer < RETRY_COUNT;
    })