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

    28  *

    29  * @summary converted from VM Testbase gc/gctests/StringGC.

    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.StringGC.StringGC

    36  */

    37 

    38 package gc.gctests.StringGC;

    39 

    40 import nsk.share.test.*;

    41 import nsk.share.gc.*;

    42 

    43 /**

    44  * Test that added strings are collected.

    45  *

    46  * Idea based on old tests:

    47  *      gc/gctests/StringGC02

    48  *      gc/gctests/TestStringGC

    49  */

    50 public class StringGC extends ThreadedGCTest {

    51         private final String toAdd = "abcdef";

    52         private int maxLength;

    53 

    54         private class StringAdder implements Runnable {

    55                 private String s;

    56 

    57                 public void run() {

    58                         s = s + toAdd;

    59                         if (s.length() > maxLength)

    60                                 s = "";

    61                 }

    62         }

    63 

    64         protected Runnable createRunnable(int i) {

    65                 return new StringAdder();

    66         }

    67 

    68         public void run() {

    69                 maxLength = (int) Math.min(

    70                         runParams.getTestMemory() / runParams.getNumberOfThreads() / toAdd.length(),

    71                         Integer.MAX_VALUE);

    72                 super.run();

    73         }

    74 

    75         public static void main(String[] args) {

    76                 GC.runTest(new StringGC(), args);

    77         }

    78 }