/*

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

 *

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

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 *

 * 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:

 *          tests forces debuggee application eat ~70% of heap and runs jstat.

 *          jstat should show that ~70% of heap (OC/OU ~= 70%).

 * @library /test/lib/share/classes

 * @library ../share

 * @build common.*

 * @build utils.*

 *

 * @run main/othervm  -XX:+UsePerfData -Xms128M -XX:MaxMetaspaceSize=128M GcCauseTest02

 */

import utils.*;

public class GcCauseTest02 {

    private final static float targetMemoryUsagePercent = 0.7f;

    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();

        // Eat metaspace and heap then run the tool again and get the results  asserting that they are reasonable

        gcProvoker.eatMetaspaceAndHeap(targetMemoryUsagePercent);

        JstatGcCauseResults measurement2 = jstatGcTool.measure();

        measurement2.assertConsistency();

        // Assert that space has been utilized acordingly

        JstatResults.assertSpaceUtilization(measurement2, targetMemoryUsagePercent);

    }

}