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.observable;
  
  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.internal.util.*;
  
  public final class ObservableTakeUntil<T, U> extends AbstractObservableWithUpstream<T, T> {
  
      final ObservableSource<? extends U> other;
  
      public ObservableTakeUntil(ObservableSource<T> source, ObservableSource<? extends U> other) {
          super(source);
          this.other = other;
      }
  
      @Override
      public void subscribeActual(Observer<? super T> child) {
          TakeUntilMainObserver<T, U> parent = new TakeUntilMainObserver<>(child);
          child.onSubscribe(parent);
  
          other.subscribe(parent.otherObserver);
          source.subscribe(parent);
      }
  
      static final class TakeUntilMainObserver<T, U> extends AtomicInteger
      implements Observer<T>, Disposable {
  
          private static final long serialVersionUID = 1418547743690811973L;
  
          final Observer<? super T> downstream;
  
          final AtomicReference<Disposable> upstream;
  
          final OtherObserver otherObserver;
  
          final AtomicThrowable error;
  
          TakeUntilMainObserver(Observer<? super T> downstream) {
              this.downstream = downstream;
              this.upstream = new AtomicReference<>();
              this.otherObserver = new OtherObserver();
              this.error = new AtomicThrowable();
          }
  
          @Override
          public void dispose() {
              DisposableHelper.dispose(upstream);
              DisposableHelper.dispose(otherObserver);
          }
  
          @Override
          public boolean isDisposed() {
              return DisposableHelper.isDisposed(upstream.get());
          }
  
          @Override
          public void onSubscribe(Disposable d) {
              DisposableHelper.setOnce(upstream, d);
          }
  
          @Override
          public void onNext(T t) {
              HalfSerializer.onNext(downstream, t, this, error);
          }
  
          @Override
          public void onError(Throwable e) {
              DisposableHelper.dispose(otherObserver);
              HalfSerializer.onError(downstream, e, this, error);
          }
  
          @Override
          public void onComplete() {
              DisposableHelper.dispose(otherObserver);
              HalfSerializer.onComplete(downstream, this, error);
          }
  
          void otherError(Throwable e) {
              DisposableHelper.dispose(upstream);
              HalfSerializer.onError(downstream, e, this, error);
          }
  
          void otherComplete() {
              DisposableHelper.dispose(upstream);
              HalfSerializer.onComplete(downstream, this, error);
          }
  
          final class OtherObserver extends AtomicReference<Disposable>
          implements Observer<U> {
  
              private static final long serialVersionUID = -8693423678067375039L;
  
              @Override
              public void onSubscribe(Disposable d) {
                  DisposableHelper.setOnce(this, d);
              }
  
              @Override
              public void onNext(U t) {
                  DisposableHelper.dispose(this);
                  otherComplete();
              }
  
              @Override
              public void onError(Throwable e) {
                  otherError(e);
              }
  
              @Override
              public void onComplete() {
                  otherComplete();
              }
  
          }
      }
  
  }
  