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 static io.reactivex.rxjava3.internal.util.ExceptionHelper.timeoutMessage;
  
  import java.util.concurrent.*;
  import java.util.concurrent.atomic.AtomicBoolean;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.disposables.*;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  
  public final class CompletableTimeout extends Completable {
  
      final CompletableSource source;
      final long timeout;
      final TimeUnit unit;
      final Scheduler scheduler;
      final CompletableSource other;
  
      public CompletableTimeout(CompletableSource source, long timeout,
                                TimeUnit unit, Scheduler scheduler, CompletableSource other) {
          this.source = source;
          this.timeout = timeout;
          this.unit = unit;
          this.scheduler = scheduler;
          this.other = other;
      }
  
      @Override
      public void subscribeActual(final CompletableObserver observer) {
          final CompositeDisposable set = new CompositeDisposable();
          observer.onSubscribe(set);
  
          final AtomicBoolean once = new AtomicBoolean();
  
          Disposable timer = scheduler.scheduleDirect(new DisposeTask(once, set, observer), timeout, unit);
  
          set.add(timer);
  
          source.subscribe(new TimeOutObserver(set, once, observer));
      }
  
      static final class TimeOutObserver implements CompletableObserver {
  
          private final CompositeDisposable set;
          private final AtomicBoolean once;
          private final CompletableObserver downstream;
  
          TimeOutObserver(CompositeDisposable set, AtomicBoolean once, CompletableObserver observer) {
              this.set = set;
              this.once = once;
              this.downstream = observer;
          }
  
          @Override
          public void onSubscribe(Disposable d) {
              set.add(d);
          }
  
          @Override
          public void onError(Throwable e) {
              if (once.compareAndSet(false, true)) {
                  set.dispose();
                  downstream.onError(e);
              } else {
                  RxJavaPlugins.onError(e);
              }
          }
  
          @Override
          public void onComplete() {
              if (once.compareAndSet(false, true)) {
                  set.dispose();
                  downstream.onComplete();
              }
          }
  
      }
  
      final class DisposeTask implements Runnable {
          private final AtomicBoolean once;
          final CompositeDisposable set;
          final CompletableObserver downstream;
  
          DisposeTask(AtomicBoolean once, CompositeDisposable set, CompletableObserver observer) {
              this.once = once;
              this.set = set;
              this.downstream = observer;
          }
  
          @Override
          public void run() {
              if (once.compareAndSet(false, true)) {
                  set.clear();
                  if (other == null) {
                      downstream.onError(new TimeoutException(timeoutMessage(timeout, unit)));
                  } else {
                      other.subscribe(new DisposeObserver());
                  }
              }
          }
  
          final class DisposeObserver implements CompletableObserver {
  
              @Override
              public void onSubscribe(Disposable d) {
                  set.add(d);
              }
  
              @Override
              public void onError(Throwable e) {
                  set.dispose();
                  downstream.onError(e);
              }
  
              @Override
              public void onComplete() {
                  set.dispose();
                  downstream.onComplete();
              }
  
          }
      }
  }
  