1 /*

     2  * Copyright (c) 2015, 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 import org.testng.annotations.Test;

    25 

    26 import java.util.regex.Pattern;

    27 

    28 import com.oracle.java.testlibrary.OutputAnalyzer;

    29 import com.oracle.java.testlibrary.dcmd.CommandExecutor;

    30 import com.oracle.java.testlibrary.dcmd.JMXExecutor;

    31 

    32 /*

    33  * @test

    34  * @summary Test of diagnostic command GC.class_histogram

    35  * @library /testlibrary

    36  * @build com.oracle.java.testlibrary.*

    37  * @build com.oracle.java.testlibrary.dcmd.*

    38  * @run testng ClassHistogramTest

    39  */

    40 public class ClassHistogramTest {

    41     public static class TestClass {}

    42     public static TestClass[] instances = new TestClass[1024];

    43     protected String classHistogramArgs = "";

    44 

    45     static {

    46         for (int i = 0; i < instances.length; ++i) {

    47             instances[i] = new TestClass();

    48         }

    49     }

    50 

    51     public void run(CommandExecutor executor) {

    52         OutputAnalyzer output = executor.execute("GC.class_histogram " + classHistogramArgs);

    53 

    54         /*

    55          * example output:

    56          *   num     #instances         #bytes  class name

    57          *  ----------------------------------------------

    58          *     1:          1647        1133752  [B

    59          *     2:          6198         383168  [C

    60          *     3:          1464         165744  java.lang.Class

    61          *     4:          6151         147624  java.lang.String

    62          *     5:          2304          73728  java.util.concurrent.ConcurrentHashMap$Node

    63          *     6:          1199          64280  [Ljava.lang.Object;

    64          * ...

    65          */

    66 

    67         /* Require at least one java.lang.Class */

    68         output.shouldMatch("^\\s+\\d+:\\s+\\d+\\s+\\d+\\s+java.lang.Class\\s*$");

    69 

    70         /* Require at least one java.lang.String */

    71         output.shouldMatch("^\\s+\\d+:\\s+\\d+\\s+\\d+\\s+java.lang.String\\s*$");

    72 

    73         /* Require at least one java.lang.Object */

    74         output.shouldMatch("^\\s+\\d+:\\s+\\d+\\s+\\d+\\s+java.lang.Object\\s*$");

    75 

    76         /* Require at exactly one TestClass[] */

    77         output.shouldMatch("^\\s+\\d+:\\s+1\\s+\\d+\\s+" +

    78                 Pattern.quote(TestClass[].class.getName()) + "\\s*$");

    79 

    80         /* Require at exactly 1024 TestClass */

    81         output.shouldMatch("^\\s+\\d+:\\s+1024\\s+\\d+\\s+" +

    82                 Pattern.quote(TestClass.class.getName()) + "\\s*$");

    83     }

    84 

    85     @Test

    86     public void jmx() {

    87         run(new JMXExecutor());

    88     }

    89 }