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 java.util.concurrent.CountDownLatch;
  
  import org.openjdk.jmh.infra.Blackhole;
  
  import io.reactivex.rxjava3.disposables.Disposable;
  
  public final class LatchedSingleObserver<T> implements SingleObserver<T> {
      final CountDownLatch cdl;
      final Blackhole bh;
      public LatchedSingleObserver(Blackhole bh) {
          this.bh = bh;
          this.cdl = new CountDownLatch(1);
      }
  
      @Override
      public void onSubscribe(Disposable d) {
  
      }
  
      @Override
      public void onSuccess(T value) {
          bh.consume(value);
          cdl.countDown();
      }
  
      @Override
      public void onError(Throwable e) {
          e.printStackTrace();
          cdl.countDown();
      }
  }
  