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.completable;
  
  import java.util.Iterator;
  import java.util.Objects;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.disposables.CompositeDisposable;
  import io.reactivex.rxjava3.exceptions.Exceptions;
  import io.reactivex.rxjava3.internal.operators.completable.CompletableMergeArrayDelayError.*;
  import io.reactivex.rxjava3.internal.util.AtomicThrowable;
  
  public final class CompletableMergeDelayErrorIterable extends Completable {
  
      final Iterable<? extends CompletableSource> sources;
  
      public CompletableMergeDelayErrorIterable(Iterable<? extends CompletableSource> sources) {
          this.sources = sources;
      }
  
      @Override
      public void subscribeActual(final CompletableObserver observer) {
          final CompositeDisposable set = new CompositeDisposable();
  
          observer.onSubscribe(set);
  
          Iterator<? extends CompletableSource> iterator;
  
          try {
              iterator = Objects.requireNonNull(sources.iterator(), "The source iterator returned is null");
          } catch (Throwable e) {
              Exceptions.throwIfFatal(e);
              observer.onError(e);
              return;
          }
  
          final AtomicInteger wip = new AtomicInteger(1);
  
          final AtomicThrowable errors = new AtomicThrowable();
          set.add(new TryTerminateAndReportDisposable(errors));
  
          for (;;) {
              if (set.isDisposed()) {
                  return;
              }
  
              boolean b;
              try {
                  b = iterator.hasNext();
              } catch (Throwable e) {
                  Exceptions.throwIfFatal(e);
                  errors.tryAddThrowableOrReport(e);
                  break;
              }
  
              if (!b) {
                  break;
              }
  
              if (set.isDisposed()) {
                  return;
              }
  
              CompletableSource c;
  
              try {
                  c = Objects.requireNonNull(iterator.next(), "The iterator returned a null CompletableSource");
              } catch (Throwable e) {
                  Exceptions.throwIfFatal(e);
                  errors.tryAddThrowableOrReport(e);
                  break;
              }
  
              if (set.isDisposed()) {
                  return;
              }
  
              wip.getAndIncrement();
  
              c.subscribe(new MergeInnerCompletableObserver(observer, set, errors, wip));
          }
  
          if (wip.decrementAndGet() == 0) {
              errors.tryTerminateConsumer(observer);
          }
      }
  }
  