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Java example source code file (PrologSizeSanityCheck.java)

This example Java source code file (PrologSizeSanityCheck.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

integermonitor, monitoredhost, monitoredvm, perfdatamemorysize, prologsizesanitycheck, runtimeexception, string, vmidentifier

The PrologSizeSanityCheck.java Java example source code

/*
 * Copyright (c) 2004, 2011, 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
 * @run main/othervm -XX:+UsePerfData  PrologSizeSanityCheck
 * @summary prolog size and overflow sanity checks
 */

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");
        }
    }
}

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