hotspot/test/serviceability/dcmd/gc/ClassHistogramTest.java
author miauno
Fri, 30 Jan 2015 20:00:57 +0100
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child 29678 dd2f3932c21e
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8071908: Port internal Diagnostic Command tests and test framework to jtreg Reviewed-by: jbachorik, egahlin, ykantser, mtobiass
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/*
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 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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import org.testng.annotations.Test;
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import java.util.regex.Pattern;
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import com.oracle.java.testlibrary.OutputAnalyzer;
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import com.oracle.java.testlibrary.dcmd.CommandExecutor;
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import com.oracle.java.testlibrary.dcmd.JMXExecutor;
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/*
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 * @test
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 * @summary Test of diagnostic command GC.class_histogram
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 * @library /testlibrary
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 * @build com.oracle.java.testlibrary.*
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 * @build com.oracle.java.testlibrary.dcmd.*
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 * @run testng ClassHistogramTest
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 */
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public class ClassHistogramTest {
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    public static class TestClass {}
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    public static TestClass[] instances = new TestClass[1024];
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    protected String classHistogramArgs = "";
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    static {
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        for (int i = 0; i < instances.length; ++i) {
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            instances[i] = new TestClass();
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        }
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    }
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    public void run(CommandExecutor executor) {
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        OutputAnalyzer output = executor.execute("GC.class_histogram " + classHistogramArgs);
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        /*
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         * example output:
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         *   num     #instances         #bytes  class name
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         *  ----------------------------------------------
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         *     1:          1647        1133752  [B
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         *     2:          6198         383168  [C
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         *     3:          1464         165744  java.lang.Class
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         *     4:          6151         147624  java.lang.String
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         *     5:          2304          73728  java.util.concurrent.ConcurrentHashMap$Node
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         *     6:          1199          64280  [Ljava.lang.Object;
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         * ...
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         */
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        /* Require at least one java.lang.Class */
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        output.shouldMatch("^\\s+\\d+:\\s+\\d+\\s+\\d+\\s+java.lang.Class\\s*$");
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        /* Require at least one java.lang.String */
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        output.shouldMatch("^\\s+\\d+:\\s+\\d+\\s+\\d+\\s+java.lang.String\\s*$");
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        /* Require at least one java.lang.Object */
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        output.shouldMatch("^\\s+\\d+:\\s+\\d+\\s+\\d+\\s+java.lang.Object\\s*$");
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        /* Require at exactly one TestClass[] */
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        output.shouldMatch("^\\s+\\d+:\\s+1\\s+\\d+\\s+" +
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                Pattern.quote(TestClass[].class.getName()) + "\\s*$");
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        /* Require at exactly 1024 TestClass */
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        output.shouldMatch("^\\s+\\d+:\\s+1024\\s+\\d+\\s+" +
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                Pattern.quote(TestClass.class.getName()) + "\\s*$");
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    }
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    @Test
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    public void jmx() {
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        run(new JMXExecutor());
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    }
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}