1 /*
   2  * Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package sun.jvmstat.perfdata.monitor;
  27 
  28 import sun.jvmstat.monitor.*;
  29 import java.nio.LongBuffer;
  30 
  31 /**
  32  * Class for monitoring a PerfData Long instrument.
  33  *
  34  * @author Brian Doherty
  35  * @since 1.5
  36  */
  37 public class PerfLongMonitor extends AbstractMonitor implements LongMonitor {
  38 
  39     /**
  40      * The buffer containing the data for the long instrument.
  41      */
  42     LongBuffer lb;
  43 
  44     /**
  45      * Constructor to create a LongMonitor object for the long instrument
  46      * represented by the data in the given buffer.
  47      *
  48      * @param name the name of the long instrument
  49      * @param u the units of measure attribute
  50      * @param v the variability attribute
  51      * @param supported support level indicator
  52      * @param lb the buffer containing the long instrument data.
  53      */
  54     public PerfLongMonitor(String name, Units u, Variability v,
  55                            boolean supported, LongBuffer lb) {
  56         super(name, u, v, supported);
  57         this.lb = lb;
  58     }
  59 
  60     /**
  61      * {@inheritDoc}
  62      * The object returned contains a Long object containing the
  63      * current value of the LongInstrument.
  64      *
  65      * @return Object - the current value of the the LongInstrument. The
  66      *                  return type is guaranteed to be of type Long.
  67      */
  68     public Object getValue() {
  69         return new Long(lb.get(0));
  70     }
  71 
  72     /**
  73      * Return the current value of the LongInstrument as an long.
  74      *
  75      * @return long - the current value of the LongInstrument
  76      */
  77     public long longValue() {
  78         return lb.get(0);
  79     }
  80 }