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.flowable;
  
  import org.reactivestreams.*;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.Exceptions;
  import io.reactivex.rxjava3.functions.*;
  import io.reactivex.rxjava3.internal.subscriptions.*;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  
  public final class FlowableDoOnLifecycle<T> extends AbstractFlowableWithUpstream<T, T> {
      private final Consumer<? super Subscription> onSubscribe;
      private final LongConsumer onRequest;
      private final Action onCancel;
  
      public FlowableDoOnLifecycle(Flowable<T> source, Consumer<? super Subscription> onSubscribe,
              LongConsumer onRequest, Action onCancel) {
          super(source);
          this.onSubscribe = onSubscribe;
          this.onRequest = onRequest;
          this.onCancel = onCancel;
      }
  
      @Override
      protected void subscribeActual(Subscriber<? super T> s) {
          source.subscribe(new SubscriptionLambdaSubscriber<>(s, onSubscribe, onRequest, onCancel));
      }
  
      static final class SubscriptionLambdaSubscriber<T> implements FlowableSubscriber<T>, Subscription {
          final Subscriber<? super T> downstream;
          final Consumer<? super Subscription> onSubscribe;
          final LongConsumer onRequest;
          final Action onCancel;
  
          Subscription upstream;
  
          SubscriptionLambdaSubscriber(Subscriber<? super T> actual,
                  Consumer<? super Subscription> onSubscribe,
                  LongConsumer onRequest,
                  Action onCancel) {
              this.downstream = actual;
              this.onSubscribe = onSubscribe;
              this.onCancel = onCancel;
              this.onRequest = onRequest;
          }
  
          @Override
          public void onSubscribe(Subscription s) {
              // this way, multiple calls to onSubscribe can show up in tests that use doOnSubscribe to validate behavior
              try {
                  onSubscribe.accept(s);
              } catch (Throwable e) {
                  Exceptions.throwIfFatal(e);
                  s.cancel();
                  this.upstream = SubscriptionHelper.CANCELLED;
                  EmptySubscription.error(e, downstream);
                  return;
              }
              if (SubscriptionHelper.validate(this.upstream, s)) {
                  this.upstream = s;
                  downstream.onSubscribe(this);
              }
          }
  
          @Override
          public void onNext(T t) {
              downstream.onNext(t);
          }
  
          @Override
          public void onError(Throwable t) {
              if (upstream != SubscriptionHelper.CANCELLED) {
                  downstream.onError(t);
              } else {
                  RxJavaPlugins.onError(t);
              }
          }
  
          @Override
          public void onComplete() {
              if (upstream != SubscriptionHelper.CANCELLED) {
                  downstream.onComplete();
              }
          }
  
          @Override
          public void request(long n) {
              try {
                  onRequest.accept(n);
              } catch (Throwable e) {
                  Exceptions.throwIfFatal(e);
                  RxJavaPlugins.onError(e);
              }
              upstream.request(n);
          }
  
          @Override
          public void cancel() {
              Subscription s = upstream;
              if (s != SubscriptionHelper.CANCELLED) {
                  upstream = SubscriptionHelper.CANCELLED;
                  try {
                      onCancel.run();
                  } catch (Throwable e) {
                      Exceptions.throwIfFatal(e);
                      RxJavaPlugins.onError(e);
                  }
                  s.cancel();
              }
          }
      }
  }
  