1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 import java.lang.reflect.Method; 18 import java.lang.reflect.Type; 19 import java.util.ArrayList; 20 import java.util.List; 21 import java.util.concurrent.Callable; 22 import java.util.concurrent.Executors; 23 import java.util.concurrent.ExecutorService; 24 import java.util.concurrent.Future; 25 import java.util.concurrent.TimeUnit; 26 import java.util.concurrent.CancellationException; 27 import java.util.concurrent.TimeoutException; 28 29 public class Main { 30 31 // Workaround for b/18051191. 32 class InnerClass {} 33 34 private static class HashCodeQuery implements Callable<Integer> { 35 public HashCodeQuery(Object obj) { 36 m_obj = obj; 37 } 38 39 public Integer call() { 40 Integer result; 41 try { 42 Class<?> c = Class.forName("Test"); 43 Method m = c.getMethod("synchronizedHashCode", Object.class); 44 result = (Integer) m.invoke(null, m_obj); 45 } catch (Exception e) { 46 System.out.println("Hash code query exception"); 47 e.printStackTrace(System.out); 48 result = -1; 49 } 50 return result; 51 } 52 53 private Object m_obj; 54 private int m_index; 55 } 56 57 public static void main(String args[]) throws Exception { 58 Object obj = new Object(); 59 int numThreads = 10; 60 61 ExecutorService pool = Executors.newFixedThreadPool(numThreads); 62 63 List<HashCodeQuery> queries = new ArrayList<HashCodeQuery>(numThreads); 64 for (int i = 0; i < numThreads; ++i) { 65 queries.add(new HashCodeQuery(obj)); 66 } 67 68 try { 69 List<Future<Integer>> results = pool.invokeAll(queries); 70 71 int hash = obj.hashCode(); 72 for (int i = 0; i < numThreads; ++i) { 73 int result = results.get(i).get(); 74 if (hash != result) { 75 throw new Error("Query #" + i + " wrong. Expected " + hash + ", got " + result); 76 } 77 } 78 pool.shutdown(); 79 } catch (CancellationException ex) { 80 System.out.println("Job timeout"); 81 System.exit(1); 82 } 83 } 84 } 85
