content: /*
   * Copyright (C) 2015 The Android Open Source Project
   *
   * 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.
   */
  
  import java.lang.reflect.Method;
  import java.lang.reflect.Type;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.concurrent.Callable;
  import java.util.concurrent.Executors;
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Future;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.CancellationException;
  import java.util.concurrent.TimeoutException;
  
  public class Main {
  
    // Workaround for b/18051191.
    class InnerClass {}
  
    private static class HashCodeQuery implements Callable<Integer> {
      public HashCodeQuery(Object obj) {
        m_obj = obj;
      }
  
      public Integer call() {
        Integer result;
        try {
          Class<?> c = Class.forName("Test");
          Method m = c.getMethod("synchronizedHashCode", new Class[] { Object.class });
          result = (Integer) m.invoke(null, m_obj);
        } catch (Exception e) {
          System.err.println("Hash code query exception");
          e.printStackTrace();
          result = -1;
        }
        return result;
      }
  
      private Object m_obj;
      private int m_index;
    }
  
    public static void main(String args[]) throws Exception {
      Object obj = new Object();
      int numThreads = 10;
  
      ExecutorService pool = Executors.newFixedThreadPool(numThreads);
  
      List<HashCodeQuery> queries = new ArrayList<HashCodeQuery>(numThreads);
      for (int i = 0; i < numThreads; ++i) {
        queries.add(new HashCodeQuery(obj));
      }
  
      try {
        List<Future<Integer>> results = pool.invokeAll(queries, 5, TimeUnit.SECONDS);
  
        int hash = obj.hashCode();
        for (int i = 0; i < numThreads; ++i) {
          int result = results.get(i).get();
          if (hash != result) {
            throw new Error("Query #" + i + " wrong. Expected " + hash + ", got " + result);
          }
        }
        pool.shutdown();
      } catch (CancellationException ex) {
        System.err.println("Job timeout");
        System.exit(1);
      }
    }
  }
  