1 /*
   2  * Copyright (c) 2018, Red Hat, Inc. All rights reserved.
   3  *
   4  * This code is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This code is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  11  * version 2 for more details (a copy is included in the LICENSE file that
  12  * accompanied this code).
  13  *
  14  * You should have received a copy of the GNU General Public License version
  15  * 2 along with this work; if not, write to the Free Software Foundation,
  16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  19  * or visit www.oracle.com if you need additional information or have any
  20  * questions.
  21  *
  22  */
  23 
  24 import java.util.Arrays;
  25 import java.util.Random;
  26 
  27 public class TestJNIGlobalRefs {
  28     static {
  29         System.loadLibrary("TestJNIGlobalRefs");
  30     }
  31 
  32     private static final int TIME_MSEC = 120000;
  33     private static final int ARRAY_SIZE = 10000;
  34 
  35     private static native void makeGlobalRef(Object o);
  36     private static native void makeWeakGlobalRef(Object o);
  37     private static native Object readGlobalRef();
  38     private static native Object readWeakGlobalRef();
  39 
  40     public static void main(String[] args) throws Throwable {
  41         seedGlobalRef();
  42         seedWeakGlobalRef();
  43         long start = System.currentTimeMillis();
  44         long current = start;
  45         while (current - start < TIME_MSEC) {
  46             testGlobal();
  47             testWeakGlobal();
  48             Thread.sleep(1);
  49             current = System.currentTimeMillis();
  50         }
  51     }
  52 
  53     private static void seedGlobalRef() {
  54         int[] a = new int[ARRAY_SIZE];
  55         fillArray(a, 1337);
  56         makeGlobalRef(a);
  57     }
  58 
  59     private static void seedWeakGlobalRef() {
  60         int[] a = new int[ARRAY_SIZE];
  61         fillArray(a, 8080);
  62         makeWeakGlobalRef(a);
  63     }
  64 
  65     private static void testGlobal() {
  66         int[] a = (int[]) readGlobalRef();
  67         checkArray(a, 1337);
  68     }
  69 
  70     private static void testWeakGlobal() {
  71         int[] a = (int[]) readWeakGlobalRef();
  72         if (a != null) {
  73             checkArray(a, 8080);
  74         } else {
  75             // weak reference is cleaned, recreate:
  76             seedWeakGlobalRef();
  77         }
  78     }
  79 
  80     private static void fillArray(int[] array, int seed) {
  81         Random r = new Random(seed);
  82         for (int i = 0; i < ARRAY_SIZE; i++) {
  83             array[i] = r.nextInt();
  84         }
  85     }
  86 
  87     private static void checkArray(int[] array, int seed) {
  88         Random r = new Random(seed);
  89         if (array.length != ARRAY_SIZE) {
  90             throw new IllegalStateException("Illegal array length: " + array.length + ", but expected " + ARRAY_SIZE);
  91         }
  92         for (int i = 0; i < ARRAY_SIZE; i++) {
  93             int actual = array[i];
  94             int expected = r.nextInt();
  95             if (actual != expected) {
  96                 throw new IllegalStateException("Incorrect array data: " + actual + ", but expected " + expected);
  97             }
  98         }
  99     }
 100 }