Question

我有PublishProcessor连续发出值。我已经订阅了PublishProcessor和两个订阅者，这两个订阅者在两个不同的线程上观察。当第一个订阅者持续收到onNext(T)中的数据时，第二个订阅者在收到对Error: Could not emit value due to lack of requests的几次调用后抛出错误onNext(T)

以下是我的实施

PublishProcessor<byte[]> publishProcessor = PublishProcessor.create()
dataFlowable.subscribeOn(Schedulers.newThread()).subscribe(publishProcessor);

Subscriber1的

publishProcessor.observeOn(Schedulers.newThread())
    .subscribeWith(new DisposableSubscriber<byte[]>() {
      @Override public void onNext(byte[] bytes) {
        //Log.i("Sub1 ", "Data received");
      }

      @Override public void onError(Throwable t) {

      }

      @Override public void onComplete() {
        Log.i("Record ", "complete");
      }
    })

subscriber2用户

publishProcessor.observeOn(Schedulers.newThread())
    .subscribeWith(new DisposableSubscriber<byte[]>() {
      @Override public void onNext(byte[] moreData) {
          Log.i("Sub2 ", "Data received");
      }

      @Override public void onError(Throwable t) {
        Log.i("Sub2 ", t.getMessage() + " ");   // error received after few call to onNext()
      }

      @Override public void onComplete() {
        Log.i("Sub2 ", "complete");
      }
    })

Answer 1

这是MissingBackpressureException。之所以发生这种情况，是因为发布商的生产速度快于订阅者的消费速PublishProcessor不会将其下游订户的背压应用于其上游源。

什么是dataFlowable？为什么不直接订阅呢？

RxJava2中的PublishProcessor

1 个答案: