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 private static class HashCodeQuery implements Callable<Integer> { HashCodeQuery(Object obj)31 public HashCodeQuery(Object obj) { 32 m_obj = obj; 33 } 34 call()35 public Integer call() { 36 Integer result; 37 try { 38 Class<?> c = Class.forName("Test"); 39 Method m = c.getMethod("synchronizedHashCode", Object.class); 40 result = (Integer) m.invoke(null, m_obj); 41 } catch (Exception e) { 42 System.out.println("Hash code query exception"); 43 e.printStackTrace(System.out); 44 result = -1; 45 } 46 return result; 47 } 48 49 private Object m_obj; 50 private int m_index; 51 } 52 main(String args[])53 public static void main(String args[]) throws Exception { 54 Object obj = new Object(); 55 int numThreads = 10; 56 57 ExecutorService pool = Executors.newFixedThreadPool(numThreads); 58 59 List<HashCodeQuery> queries = new ArrayList<HashCodeQuery>(numThreads); 60 for (int i = 0; i < numThreads; ++i) { 61 queries.add(new HashCodeQuery(obj)); 62 } 63 64 try { 65 List<Future<Integer>> results = pool.invokeAll(queries); 66 67 int hash = obj.hashCode(); 68 for (int i = 0; i < numThreads; ++i) { 69 int result = results.get(i).get(); 70 if (hash != result) { 71 throw new Error("Query #" + i + " wrong. Expected " + hash + ", got " + result); 72 } 73 } 74 pool.shutdown(); 75 } catch (CancellationException ex) { 76 System.out.println("Job timeout"); 77 System.exit(1); 78 } 79 } 80 } 81