code: /*
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
   * compliance with the License. You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software distributed under the License is
   * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
   * the License for the specific language governing permissions and limitations under the License.
   */
  
  package io.reactivex.rxjava3.internal.operators.flowable;
  
  import org.reactivestreams.*;
  
  import io.reactivex.rxjava3.core.Flowable;
  import io.reactivex.rxjava3.exceptions.Exceptions;
  import io.reactivex.rxjava3.functions.Function;
  import io.reactivex.rxjava3.internal.operators.flowable.FlowableRepeatWhen.*;
  import io.reactivex.rxjava3.internal.subscriptions.EmptySubscription;
  import io.reactivex.rxjava3.processors.*;
  import io.reactivex.rxjava3.subscribers.SerializedSubscriber;
  
  import java.util.Objects;
  
  public final class FlowableRetryWhen<T> extends AbstractFlowableWithUpstream<T, T> {
      final Function<? super Flowable<Throwable>, ? extends Publisher<?>> handler;
  
      public FlowableRetryWhen(Flowable<T> source,
              Function<? super Flowable<Throwable>, ? extends Publisher<?>> handler) {
          super(source);
          this.handler = handler;
      }
  
      @Override
      public void subscribeActual(Subscriber<? super T> s) {
          SerializedSubscriber<T> z = new SerializedSubscriber<>(s);
  
          FlowableProcessor<Throwable> processor = UnicastProcessor.<Throwable>create(8).toSerialized();
  
          Publisher<?> when;
  
          try {
              when = Objects.requireNonNull(handler.apply(processor), "handler returned a null Publisher");
          } catch (Throwable ex) {
              Exceptions.throwIfFatal(ex);
              EmptySubscription.error(ex, s);
              return;
          }
  
          WhenReceiver<T, Throwable> receiver = new WhenReceiver<>(source);
  
          RetryWhenSubscriber<T> subscriber = new RetryWhenSubscriber<>(z, processor, receiver);
  
          receiver.subscriber = subscriber;
  
          s.onSubscribe(subscriber);
  
          when.subscribe(receiver);
  
          receiver.onNext(0);
      }
  
      static final class RetryWhenSubscriber<T> extends WhenSourceSubscriber<T, Throwable> {
  
          private static final long serialVersionUID = -2680129890138081029L;
  
          RetryWhenSubscriber(Subscriber<? super T> actual, FlowableProcessor<Throwable> processor,
                  Subscription receiver) {
              super(actual, processor, receiver);
          }
  
          @Override
          public void onError(Throwable t) {
              again(t);
          }
  
          @Override
          public void onComplete() {
              receiver.cancel();
              downstream.onComplete();
          }
      }
  
  }
  