/*

 * Copyright (c) 2004, 2017, 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.

 */

/*

 * @test

 * @bug 4990825

 * @summary prolog size and overflow sanity checks

 *

 * @run main/othervm -XX:+UsePerfData PrologSizeSanityCheck

 */

import sun.jvmstat.monitor.*;

public class PrologSizeSanityCheck {

    private static final String sizeName = "sun.perfdata.size";

    private static final String usedName = "sun.perfdata.used";

    private static final String overflowName = "sun.perfdata.overflow";

    private static final int K = 1024;

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

        VmIdentifier vmid = new VmIdentifier("0");

        MonitoredHost localhost = MonitoredHost.getMonitoredHost("localhost");

        MonitoredVm self = localhost.getMonitoredVm(vmid);

        IntegerMonitor prologSize = (IntegerMonitor)self.findByName(sizeName);

        IntegerMonitor prologUsed = (IntegerMonitor)self.findByName(usedName);

        IntegerMonitor prologOverflow =

                (IntegerMonitor)self.findByName(overflowName);

        if (prologOverflow.intValue() != 0) {

            throw new RuntimeException("jvmstat memory buffer overflow: "

                    + sizeName + "=" + prologSize.intValue()

                    + usedName + "=" + prologUsed.intValue()

                    + overflowName + "=" + prologOverflow.intValue()

                    + " : PerfDataMemorySize must be increased");

        }

        if (prologUsed.intValue() + 3*K >= prologSize.intValue()) {

          /*

           * we want to leave at least 3K of space to allow for long

           * string names in the various path oriented strings and for

           * the command line argument and vm argument strings. 3K is

           * somewhat of an arbitrary figure, but it is based on failure

           * scenarios observed in SQE when jvmstat was originally

           * introduced in 1.4.1.

           */

            throw new RuntimeException(

                   "jvmstat memory buffer usage approaching size: "

                    + sizeName + "=" + prologSize.intValue()

                    + usedName + "=" + prologUsed.intValue()

                    + " : consider increasing PerfDataMemorySize");

        }

    }

}