code: // Licensed to the Software Freedom Conservancy (SFC) under one
  // or more contributor license agreements.  See the NOTICE file
  // distributed with this work for additional information
  // regarding copyright ownership.  The SFC licenses this file
  // to you 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 org.openqa.selenium.testing;
  
  import java.util.LinkedList;
  import java.util.List;
  import java.util.concurrent.CompletableFuture;
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Executors;
  
  public class Safely {
  
    public static void safelyCall(TearDownFixture... fixtures) {
      ExecutorService executor = Executors.newFixedThreadPool(fixtures.length);
      List<CompletableFuture<Void>> futures = new LinkedList<>();
  
      for (TearDownFixture fixture : fixtures) {
        CompletableFuture<Void> check = new CompletableFuture<>();
        executor.submit(
            () -> {
              // Fixture being null is handled by the exception check.
              try {
                fixture.tearDown();
              } catch (Exception ignored) {
                // nothing to see here.
              }
              check.complete(null);
            });
        futures.add(check);
      }
  
      try {
        CompletableFuture.allOf(futures.toArray(new CompletableFuture[] {}));
      } finally {
        executor.shutdownNow();
      }
    }
  }
  