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.*;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.disposables.Disposable;
  import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  
  /**
   * Terminates the sequence if either the main or the other Completable terminate.
   * <p>History: 2.1.17 - experimental
   * @since 2.2
   */
  public final class CompletableTakeUntilCompletable extends Completable {
  
      final Completable source;
  
      final CompletableSource other;
  
      public CompletableTakeUntilCompletable(Completable source,
              CompletableSource other) {
          this.source = source;
          this.other = other;
      }
  
      @Override
      protected void subscribeActual(CompletableObserver observer) {
          TakeUntilMainObserver parent = new TakeUntilMainObserver(observer);
          observer.onSubscribe(parent);
  
          other.subscribe(parent.other);
          source.subscribe(parent);
      }
  
      static final class TakeUntilMainObserver extends AtomicReference<Disposable>
      implements CompletableObserver, Disposable {
  
          private static final long serialVersionUID = 3533011714830024923L;
  
          final CompletableObserver downstream;
  
          final OtherObserver other;
  
          final AtomicBoolean once;
  
          TakeUntilMainObserver(CompletableObserver downstream) {
              this.downstream = downstream;
              this.other = new OtherObserver(this);
              this.once = new AtomicBoolean();
          }
  
          @Override
          public void dispose() {
              if (once.compareAndSet(false, true)) {
                  DisposableHelper.dispose(this);
                  DisposableHelper.dispose(other);
              }
          }
  
          @Override
          public boolean isDisposed() {
              return once.get();
          }
  
          @Override
          public void onSubscribe(Disposable d) {
              DisposableHelper.setOnce(this, d);
          }
  
          @Override
          public void onComplete() {
              if (once.compareAndSet(false, true)) {
                  DisposableHelper.dispose(other);
                  downstream.onComplete();
              }
          }
  
          @Override
          public void onError(Throwable e) {
              if (once.compareAndSet(false, true)) {
                  DisposableHelper.dispose(other);
                  downstream.onError(e);
              } else {
                  RxJavaPlugins.onError(e);
              }
          }
  
          void innerComplete() {
              if (once.compareAndSet(false, true)) {
                  DisposableHelper.dispose(this);
                  downstream.onComplete();
              }
          }
  
          void innerError(Throwable e) {
              if (once.compareAndSet(false, true)) {
                  DisposableHelper.dispose(this);
                  downstream.onError(e);
              } else {
                  RxJavaPlugins.onError(e);
              }
          }
  
          static final class OtherObserver extends AtomicReference<Disposable>
          implements CompletableObserver {
  
              private static final long serialVersionUID = 5176264485428790318L;
              final TakeUntilMainObserver parent;
  
              OtherObserver(TakeUntilMainObserver parent) {
                  this.parent = parent;
              }
  
              @Override
              public void onSubscribe(Disposable d) {
                  DisposableHelper.setOnce(this, d);
              }
  
              @Override
              public void onComplete() {
                  parent.innerComplete();
              }
  
              @Override
              public void onError(Throwable e) {
                  parent.innerError(e);
              }
          }
      }
  }
  