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 io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.disposables.Disposable;
  import io.reactivex.rxjava3.exceptions.*;
  import io.reactivex.rxjava3.functions.Consumer;
  
  public final class CompletableDoOnEvent extends Completable {
      final CompletableSource source;
      final Consumer<? super Throwable> onEvent;
  
      public CompletableDoOnEvent(final CompletableSource source, final Consumer<? super Throwable> onEvent) {
          this.source = source;
          this.onEvent = onEvent;
      }
  
      @Override
      protected void subscribeActual(final CompletableObserver observer) {
          source.subscribe(new DoOnEvent(observer));
      }
  
      final class DoOnEvent implements CompletableObserver {
          private final CompletableObserver observer;
  
          DoOnEvent(CompletableObserver observer) {
              this.observer = observer;
          }
  
          @Override
          public void onComplete() {
              try {
                  onEvent.accept(null);
              } catch (Throwable e) {
                  Exceptions.throwIfFatal(e);
                  observer.onError(e);
                  return;
              }
  
              observer.onComplete();
          }
  
          @Override
          public void onError(Throwable e) {
              try {
                  onEvent.accept(e);
              } catch (Throwable ex) {
                  Exceptions.throwIfFatal(ex);
                  e = new CompositeException(e, ex);
              }
  
              observer.onError(e);
          }
  
          @Override
          public void onSubscribe(final Disposable d) {
              observer.onSubscribe(d);
          }
      }
  }
  