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.subscriptions;
  
  import java.util.concurrent.atomic.AtomicBoolean;
  
  import org.reactivestreams.Subscription;
  
  /**
   * Subscription implementation that ignores request but remembers the cancellation
   * which can be checked via isCancelled.
   */
  public final class BooleanSubscription extends AtomicBoolean implements Subscription {
  
      private static final long serialVersionUID = -8127758972444290902L;
  
      @Override
      public void request(long n) {
          SubscriptionHelper.validate(n);
      }
  
      @Override
      public void cancel() {
          lazySet(true);
      }
  
      /**
       * Returns true if this BooleanSubscription has been cancelled.
       * @return true if this BooleanSubscription has been cancelled
       */
      public boolean isCancelled() {
          return get();
      }
  
      @Override
      public String toString() {
          return "BooleanSubscription(cancelled=" + get() + ")";
      }
  }
  