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.core;
  
  import org.reactivestreams.*;
  
  import io.reactivex.rxjava3.annotations.NonNull;
  
  /**
   * Represents a Reactive-Streams inspired {@link Subscriber} that is RxJava 3 only
   * and weakens the Reactive Streams rules <a href='https://github.com/reactive-streams/reactive-streams-jvm#1.3'>§1.3</a>
   * and <a href='https://github.com/reactive-streams/reactive-streams-jvm#3.9'>§3.9</a> of the specification
   * for gaining performance.
   *
   * <p>History: 2.0.7 - experimental; 2.1 - beta
   * @param <T> the value type
   * @since 2.2
   */
  public interface FlowableSubscriber<@NonNull T> extends Subscriber<T> {
  
      /**
       * Implementors of this method should make sure everything that needs
       * to be visible in {@link #onNext(Object)} is established before
       * calling {@link Subscription#request(long)}. In practice this means
       * no initialization should happen after the {@code request()} call and
       * additional behavior is thread safe in respect to {@code onNext}.
       *
       * {@inheritDoc}
       */
      @Override
      void onSubscribe(@NonNull Subscription s);
  }
  