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.mixed;
  
  import java.util.concurrent.atomic.AtomicReference;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.disposables.Disposable;
  import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
  
  /**
   * After Completable completes, it relays the signals
   * of the ObservableSource to the downstream observer.
   * 
   * @param <R> the result type of the ObservableSource and this operator
   * @since 2.1.15
   */
  public final class CompletableAndThenObservable<R> extends Observable<R> {
  
      final CompletableSource source;
  
      final ObservableSource<? extends R> other;
  
      public CompletableAndThenObservable(CompletableSource source,
              ObservableSource<? extends R> other) {
          this.source = source;
          this.other = other;
      }
  
      @Override
      protected void subscribeActual(Observer<? super R> observer) {
          AndThenObservableObserver<R> parent = new AndThenObservableObserver<>(observer, other);
          observer.onSubscribe(parent);
          source.subscribe(parent);
      }
  
      static final class AndThenObservableObserver<R>
      extends AtomicReference<Disposable>
      implements Observer<R>, CompletableObserver, Disposable {
  
          private static final long serialVersionUID = -8948264376121066672L;
  
          final Observer<? super R> downstream;
  
          ObservableSource<? extends R> other;
  
          AndThenObservableObserver(Observer<? super R> downstream, ObservableSource<? extends R> other) {
              this.other = other;
              this.downstream = downstream;
          }
  
          @Override
          public void onNext(R t) {
              downstream.onNext(t);
          }
  
          @Override
          public void onError(Throwable t) {
              downstream.onError(t);
          }
  
          @Override
          public void onComplete() {
              ObservableSource<? extends R> o = other;
              if (o == null) {
                  downstream.onComplete();
              } else {
                  other = null;
                  o.subscribe(this);
              }
          }
  
          @Override
          public void dispose() {
              DisposableHelper.dispose(this);
          }
  
          @Override
          public boolean isDisposed() {
              return DisposableHelper.isDisposed(get());
          }
  
          @Override
          public void onSubscribe(Disposable d) {
              DisposableHelper.replace(this, d);
          }
  
      }
  }
  