/*

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 * 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.

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/*

 * @test

 * @summary Test checks output displayed with jstat -gccause.

 *          Test scenario:

 *          test several times provokes garbage collection in the debuggee application and after each garbage

 *          collection runs jstat. jstat should show that after garbage collection number of GC events and garbage

 *          collection time increase.

 * @library /test/lib/share/classes

 * @library ../share

 * @requires vm.opt.ExplicitGCInvokesConcurrent != true

 * @build common.*

 * @build utils.*

 *

 * @run main/othervm -XX:+UsePerfData -Xmx128M GcCauseTest01

 */

import utils.*;

public class GcCauseTest01 {

    public static void main(String[] args) throws Exception {

        // We will be running "jstat -gc" tool

        JstatGcCauseTool jstatGcTool = new JstatGcCauseTool(ProcessHandle.current().getPid());

        // Run once and get the  results asserting that they are reasonable

        JstatGcCauseResults measurement1 = jstatGcTool.measure();

        measurement1.assertConsistency();

        GcProvoker gcProvoker = GcProvoker.createGcProvoker();

        // Provoke GC then run the tool again and get the results  asserting that they are reasonable

        gcProvoker.provokeGc();

        JstatGcCauseResults measurement2 = jstatGcTool.measure();

        measurement2.assertConsistency();

        // Assert the increase in GC events and time between the measurements

        JstatResults.assertGCEventsIncreased(measurement1, measurement2);

        JstatResults.assertGCTimeIncreased(measurement1, measurement2);

        // Provoke GC 3rd time then run the tool 3rd time twice and get the results

        // asserting that they are reasonable

        gcProvoker.provokeGc();

        JstatGcCauseResults measurement3 = jstatGcTool.measure();

        measurement3.assertConsistency();

        // Assert the increase in GC events and time between the measurements

        JstatResults.assertGCEventsIncreased(measurement2, measurement3);

        JstatResults.assertGCTimeIncreased(measurement2, measurement3);

    }

}