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.concurrent.atomic.AtomicReference;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.disposables.Disposable;
  import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
  
  public final class CompletableAndThenCompletable extends Completable {
  
      final CompletableSource source;
  
      final CompletableSource next;
  
      public CompletableAndThenCompletable(CompletableSource source, CompletableSource next) {
          this.source = source;
          this.next = next;
      }
  
      @Override
      protected void subscribeActual(CompletableObserver observer) {
          source.subscribe(new SourceObserver(observer, next));
      }
  
      static final class SourceObserver
              extends AtomicReference<Disposable>
              implements CompletableObserver, Disposable {
  
          private static final long serialVersionUID = -4101678820158072998L;
  
          final CompletableObserver actualObserver;
  
          final CompletableSource next;
  
          SourceObserver(CompletableObserver actualObserver, CompletableSource next) {
              this.actualObserver = actualObserver;
              this.next = next;
          }
  
          @Override
          public void onSubscribe(Disposable d) {
              if (DisposableHelper.setOnce(this, d)) {
                  actualObserver.onSubscribe(this);
              }
          }
  
          @Override
          public void onError(Throwable e) {
              actualObserver.onError(e);
          }
  
          @Override
          public void onComplete() {
              next.subscribe(new NextObserver(this, actualObserver));
          }
  
          @Override
          public void dispose() {
              DisposableHelper.dispose(this);
          }
  
          @Override
          public boolean isDisposed() {
              return DisposableHelper.isDisposed(get());
          }
      }
  
      static final class NextObserver implements CompletableObserver {
  
          final AtomicReference<Disposable> parent;
  
          final CompletableObserver downstream;
  
          NextObserver(AtomicReference<Disposable> parent, CompletableObserver downstream) {
              this.parent = parent;
              this.downstream = downstream;
          }
  
          @Override
          public void onSubscribe(Disposable d) {
              DisposableHelper.replace(parent, d);
          }
  
          @Override
          public void onComplete() {
              downstream.onComplete();
          }
  
          @Override
          public void onError(Throwable e) {
              downstream.onError(e);
          }
      }
  }
  