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 *

 * This code is free software; you can redistribute it and/or modify it

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 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

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import org.testng.annotations.Test;

import java.util.regex.Pattern;

import jdk.test.lib.process.OutputAnalyzer;

import jdk.test.lib.dcmd.CommandExecutor;

import jdk.test.lib.dcmd.JMXExecutor;

/*

 * @test

 * @summary Test of diagnostic command GC.class_histogram

 * @library /test/lib

 * @modules java.base/jdk.internal.misc

 *          java.compiler

 *          java.management

 * @run testng ClassHistogramTest

 */

public class ClassHistogramTest {

    public static class TestClass {}

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

    protected String classHistogramArgs = "";

    static {

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

            instances[i] = new TestClass();

        }

    }

    public void run(CommandExecutor executor) {

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

        /*

         * example output:

         *  num     #instances         #bytes  class name (module)

         * -------------------------------------------------------

         *    1:          7991         757792  [B (java.base@9-internal)

         *    2:          1811         217872  java.lang.Class (java.base@9-internal)

         *    3:          6724         215168  java.util.HashMap$Node (java.base@9-internal)

         *    4:          7852         188448  java.lang.String (java.base@9-internal)

         *    5:          1378         105040  [Ljava.util.HashMap$Node; (java.base@9-internal)

         *    6:          1863          95096  [Ljava.lang.Object; (java.base@9-internal)

         * ...

         */

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

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

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

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

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

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

        /* Require at exactly one TestClass[] */

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

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

        /* Require at exactly 1024 TestClass */

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

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

    }

    @Test

    public void jmx() {

        run(new JMXExecutor());

    }

}