1 /*
   2  * Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 
  25 /*
  26  * @test
  27  * @key stress gc randomness
  28  *
  29  * @summary converted from VM Testbase gc/gctests/StringInternGC.
  30  * VM Testbase keywords: [gc, stress, stressopt, nonconcurrent, quick]
  31  *
  32  * @library /vmTestbase
  33  *          /test/lib
  34  * @run driver jdk.test.lib.FileInstaller . .
  35  * @run main/othervm gc.gctests.StringInternGC.StringInternGC
  36  */
  37 
  38 package gc.gctests.StringInternGC;
  39 
  40 import nsk.share.test.*;
  41 import nsk.share.gc.*;
  42 
  43 /**
  44  * Test that strings returned by String.intern() can be collected.
  45  *
  46  * Create strings consisting of random characters, call String.intern().
  47  * String pool should not overflow.
  48  */
  49 public class StringInternGC extends ThreadedGCTest {
  50         private int maxLength = 1000;
  51 
  52         private class StringGenerator implements Runnable {
  53                 private StringBuffer sb = new StringBuffer();
  54 
  55                 private String generateString() {
  56                         int length = LocalRandom.nextInt(maxLength);
  57                         for (int i = 0; i < length; ++i)
  58                                 sb.append((char) LocalRandom.nextInt(Integer.MAX_VALUE));
  59                         return sb.toString();
  60                 }
  61 
  62 
  63                 public void run() {
  64                         generateString().intern();
  65                 }
  66         }
  67 
  68         protected Runnable createRunnable(int i) {
  69                 return new StringGenerator();
  70         }
  71 
  72         public static void main(String[] args) {
  73                 GC.runTest(new StringInternGC(), args);
  74         }
  75 }