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.fuseable;
  
  import io.reactivex.rxjava3.operators.QueueFuseable;
  
  /**
   * Represents an empty, async-only {@link QueueFuseable} instance that tracks and exposes a
   * canceled/disposed state.
   *
   * @param <T> the output value type
   * @since 3.0.0
   */
  public final class CancellableQueueFuseable<T>
  extends AbstractEmptyQueueFuseable<T> {
  
      volatile boolean disposed;
  
      @Override
      public void cancel() {
          disposed = true;
      }
  
      @Override
      public void dispose() {
          disposed = true;
      }
  
      @Override
      public boolean isDisposed() {
          return disposed;
      }
  }
  