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Datei: TestCounterTime.java Sprache: JAVA

/*
* Copyright (c) 2018, 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.
*/

package jdk.jfr.jvm;

import static jdk.test.lib.Asserts.assertGreaterThan;

import jdk.jfr.internal.JVM;

/**
* @test TestCounterTime
* @key jfr
* @requires vm.hasJFR
* @library /test/lib
* @modules jdk.jfr/jdk.jfr.internal
* @run main/othervm jdk.jfr.jvm.TestCounterTime
*/
public class TestCounterTime {

    public static void main(String... args) throws InterruptedException {
        // Not enabled
        assertCounterTime();

        JVM jvm = JVM.getJVM();
        jvm.createNativeJFR();
        assertCounterTime();
        // Enabled
        jvm.destroyNativeJFR();
    }

    private static void assertCounterTime() throws InterruptedException {
        long time1 = JVM.counterTime();
        assertGreaterThan(time1, 0L, "Counter time can't be negative.");

        Thread.sleep(1);

        long time2 = JVM.counterTime();
        assertGreaterThan(time2, time1, "Counter time must be increasing.");
    }
}

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