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.Subscriber;
  
  import io.reactivex.rxjava3.annotations.Nullable;
  import io.reactivex.rxjava3.core.Flowable;
  import io.reactivex.rxjava3.functions.Consumer;
  import io.reactivex.rxjava3.internal.subscribers.*;
  import io.reactivex.rxjava3.operators.ConditionalSubscriber;
  
  /**
   * Calls a consumer after pushing the current item to the downstream.
   * <p>History: 2.0.1 - experimental
   * @param <T> the value type
   * @since 2.1
   */
  public final class FlowableDoAfterNext<T> extends AbstractFlowableWithUpstream<T, T> {
  
      final Consumer<? super T> onAfterNext;
  
      public FlowableDoAfterNext(Flowable<T> source, Consumer<? super T> onAfterNext) {
          super(source);
          this.onAfterNext = onAfterNext;
      }
  
      @Override
      protected void subscribeActual(Subscriber<? super T> s) {
          if (s instanceof ConditionalSubscriber) {
              source.subscribe(new DoAfterConditionalSubscriber<>((ConditionalSubscriber<? super T>) s, onAfterNext));
          } else {
              source.subscribe(new DoAfterSubscriber<>(s, onAfterNext));
          }
      }
  
      static final class DoAfterSubscriber<T> extends BasicFuseableSubscriber<T, T> {
  
          final Consumer<? super T> onAfterNext;
  
          DoAfterSubscriber(Subscriber<? super T> actual, Consumer<? super T> onAfterNext) {
              super(actual);
              this.onAfterNext = onAfterNext;
          }
  
          @Override
          public void onNext(T t) {
              if (done) {
                  return;
              }
              downstream.onNext(t);
  
              if (sourceMode == NONE) {
                  try {
                      onAfterNext.accept(t);
                  } catch (Throwable ex) {
                      fail(ex);
                  }
              }
          }
  
          @Override
          public int requestFusion(int mode) {
              return transitiveBoundaryFusion(mode);
          }
  
          @Nullable
          @Override
          public T poll() throws Throwable {
              T v = qs.poll();
              if (v != null) {
                  onAfterNext.accept(v);
              }
              return v;
          }
      }
  
      static final class DoAfterConditionalSubscriber<T> extends BasicFuseableConditionalSubscriber<T, T> {
  
          final Consumer<? super T> onAfterNext;
  
          DoAfterConditionalSubscriber(ConditionalSubscriber<? super T> actual, Consumer<? super T> onAfterNext) {
              super(actual);
              this.onAfterNext = onAfterNext;
          }
  
          @Override
          public void onNext(T t) {
              downstream.onNext(t);
  
              if (sourceMode == NONE) {
                  try {
                      onAfterNext.accept(t);
                  } catch (Throwable ex) {
                      fail(ex);
                  }
              }
          }
  
          @Override
          public boolean tryOnNext(T t) {
              boolean b = downstream.tryOnNext(t);
              try {
                  onAfterNext.accept(t);
              } catch (Throwable ex) {
                  fail(ex);
              }
              return b;
          }
  
          @Override
          public int requestFusion(int mode) {
              return transitiveBoundaryFusion(mode);
          }
  
          @Nullable
          @Override
          public T poll() throws Throwable {
              T v = qs.poll();
              if (v != null) {
                  onAfterNext.accept(v);
              }
              return v;
          }
      }
  }
  