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.observers;
  
  import java.util.concurrent.atomic.AtomicReference;
  
  import io.reactivex.rxjava3.core.SingleObserver;
  import io.reactivex.rxjava3.disposables.Disposable;
  import io.reactivex.rxjava3.exceptions.*;
  import io.reactivex.rxjava3.functions.BiConsumer;
  import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  
  public final class BiConsumerSingleObserver<T>
  extends AtomicReference<Disposable>
  implements SingleObserver<T>, Disposable {
  
      private static final long serialVersionUID = 4943102778943297569L;
      final BiConsumer<? super T, ? super Throwable> onCallback;
  
      public BiConsumerSingleObserver(BiConsumer<? super T, ? super Throwable> onCallback) {
          this.onCallback = onCallback;
      }
  
      @Override
      public void onError(Throwable e) {
          try {
              lazySet(DisposableHelper.DISPOSED);
              onCallback.accept(null, e);
          } catch (Throwable ex) {
              Exceptions.throwIfFatal(ex);
              RxJavaPlugins.onError(new CompositeException(e, ex));
          }
      }
  
      @Override
      public void onSubscribe(Disposable d) {
          DisposableHelper.setOnce(this, d);
      }
  
      @Override
      public void onSuccess(T value) {
          try {
              lazySet(DisposableHelper.DISPOSED);
              onCallback.accept(value, null);
          } catch (Throwable ex) {
              Exceptions.throwIfFatal(ex);
              RxJavaPlugins.onError(ex);
          }
      }
  
      @Override
      public void dispose() {
          DisposableHelper.dispose(this);
      }
  
      @Override
      public boolean isDisposed() {
          return get() == DisposableHelper.DISPOSED;
      }
  }
  