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.maybe;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.disposables.Disposable;
  import io.reactivex.rxjava3.exceptions.*;
  import io.reactivex.rxjava3.functions.*;
  import io.reactivex.rxjava3.internal.disposables.*;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  
  /**
   * Peeks into the lifecycle of a Maybe and MaybeObserver.
   *
   * @param <T> the value type
   */
  public final class MaybePeek<T> extends AbstractMaybeWithUpstream<T, T> {
  
      final Consumer<? super Disposable> onSubscribeCall;
  
      final Consumer<? super T> onSuccessCall;
  
      final Consumer<? super Throwable> onErrorCall;
  
      final Action onCompleteCall;
  
      final Action onAfterTerminate;
  
      final Action onDisposeCall;
  
      public MaybePeek(MaybeSource<T> source, Consumer<? super Disposable> onSubscribeCall,
              Consumer<? super T> onSuccessCall, Consumer<? super Throwable> onErrorCall, Action onCompleteCall,
              Action onAfterTerminate, Action onDispose) {
          super(source);
          this.onSubscribeCall = onSubscribeCall;
          this.onSuccessCall = onSuccessCall;
          this.onErrorCall = onErrorCall;
          this.onCompleteCall = onCompleteCall;
          this.onAfterTerminate = onAfterTerminate;
          this.onDisposeCall = onDispose;
      }
  
      @Override
      protected void subscribeActual(MaybeObserver<? super T> observer) {
          source.subscribe(new MaybePeekObserver<>(observer, this));
      }
  
      static final class MaybePeekObserver<T> implements MaybeObserver<T>, Disposable {
          final MaybeObserver<? super T> downstream;
  
          final MaybePeek<T> parent;
  
          Disposable upstream;
  
          MaybePeekObserver(MaybeObserver<? super T> actual, MaybePeek<T> parent) {
              this.downstream = actual;
              this.parent = parent;
          }
  
          @Override
          public void dispose() {
              try {
                  parent.onDisposeCall.run();
              } catch (Throwable ex) {
                  Exceptions.throwIfFatal(ex);
                  RxJavaPlugins.onError(ex);
              }
  
              upstream.dispose();
              upstream = DisposableHelper.DISPOSED;
          }
  
          @Override
          public boolean isDisposed() {
              return upstream.isDisposed();
          }
  
          @Override
          public void onSubscribe(Disposable d) {
              if (DisposableHelper.validate(this.upstream, d)) {
                  try {
                      parent.onSubscribeCall.accept(d);
                  } catch (Throwable ex) {
                      Exceptions.throwIfFatal(ex);
                      d.dispose();
                      this.upstream = DisposableHelper.DISPOSED;
                      EmptyDisposable.error(ex, downstream);
                      return;
                  }
  
                  this.upstream = d;
  
                  downstream.onSubscribe(this);
              }
          }
  
          @Override
          public void onSuccess(T value) {
              if (this.upstream == DisposableHelper.DISPOSED) {
                  return;
              }
              try {
                  parent.onSuccessCall.accept(value);
              } catch (Throwable ex) {
                  Exceptions.throwIfFatal(ex);
                  onErrorInner(ex);
                  return;
              }
              this.upstream = DisposableHelper.DISPOSED;
  
              downstream.onSuccess(value);
  
              onAfterTerminate();
          }
  
          @Override
          public void onError(Throwable e) {
              if (this.upstream == DisposableHelper.DISPOSED) {
                  RxJavaPlugins.onError(e);
                  return;
              }
  
              onErrorInner(e);
          }
  
          void onErrorInner(Throwable e) {
              try {
                  parent.onErrorCall.accept(e);
              } catch (Throwable ex) {
                  Exceptions.throwIfFatal(ex);
                  e = new CompositeException(e, ex);
              }
  
              this.upstream = DisposableHelper.DISPOSED;
  
              downstream.onError(e);
  
              onAfterTerminate();
          }
  
          @Override
          public void onComplete() {
              if (this.upstream == DisposableHelper.DISPOSED) {
                  return;
              }
  
              try {
                  parent.onCompleteCall.run();
              } catch (Throwable ex) {
                  Exceptions.throwIfFatal(ex);
                  onErrorInner(ex);
                  return;
              }
              this.upstream = DisposableHelper.DISPOSED;
  
              downstream.onComplete();
  
              onAfterTerminate();
          }
  
          void onAfterTerminate() {
              try {
                  parent.onAfterTerminate.run();
              } catch (Throwable ex) {
                  Exceptions.throwIfFatal(ex);
                  RxJavaPlugins.onError(ex);
              }
          }
      }
  }
  