Question

我遇到了repeatWhen()与Completable合作的问题。以下代码块正在运行。订阅的Action最终会在重复后运行。

completable
.subscribeOn(Schedulers.trampoline()) //for debug purposes; have also omitted completely
.repeat(2)
.observeOn(Schedulers.trampoline()) //for debug purposes; have also omitted completely
.subscribe(new Action() {
    @Override
    public void run() throws Exception {
        //runs
    }
}

但是，当我尝试以下

时

completable
.subscribeOn(Schedulers.trampoline()) //for debug purposes; have also omitted completely
.repeatWhen(new MyRetry(2))
.observeOn(Schedulers.trampoline()) //for debug purposes; have also omitted completely
.subscribe(new Action() {
    @Override
    public void run() throws Exception {
        //doesn't run
    }
}

MyRetry的定义如下：

class MyRetry implements Function<Flowable<Object>, Publisher<?>> {

    private final int maxRetryCount;
    private int retryCount;

    /**
     * @param maxRetryCount The number of times to repeat
     */
    public MyRetry(final int maxRetryCount) {
        this.maxRetryCount = maxRetryCount;
        retryCount = 0;
    }

    @Override
    public Publisher<?> apply(final Flowable<Object> objectFlowable) throws Exception {
        return objectFlowable.flatMap(new Function<Object, Publisher<?>>() {
            @Override
            public Publisher<?> apply(final Object o) throws Exception {
                if (retryCount < maxRetryCount) {
                    retryCount++;
                    return Flowable.just(o);
                } else {
                    return Flowable.empty();
                }
            }
        });
    }
}

订阅的Action在完成重复后永远不会运行，但Completable的原始订阅会重复两次。这让我相信我在返回Flowable.empty()时可能不正确，但我无法找到有关此主题的信息，而且我对RxJava还不太新。我也有基础设施限制，让我仍然坚持使用Android中的Java 7。

Answer 1

如果您在onCompleted()课程中将flatMap()更改为takeUntil()，则初始订阅者将收到MyRetry个活动：

@Override
public Publisher<?> apply(final Flowable<Object> objectFlowable) throws Exception {
    return objectFlowable.takeWhile(o -> retryCount++ < maxRetryCount);
}

^{此问题已在this中讨论过
线程。}

repeatWhen（）没有完成

1 个答案: