/*

 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

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

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

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

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * 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.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

import org.testng.annotations.Test;

import java.util.regex.Pattern;

import com.oracle.java.testlibrary.OutputAnalyzer;

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

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

/*

 * @test

 * @summary Test of diagnostic command GC.class_histogram

 * @library /testlibrary

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

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

 * @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

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

         *     1:          1647        1133752  [B

         *     2:          6198         383168  [C

         *     3:          1464         165744  java.lang.Class

         *     4:          6151         147624  java.lang.String

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

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

         * ...

         */

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

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

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

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

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

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

    }

}