1 /*
   2  * Copyright (c) 2009, 2010, 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 
  27 package com.sun.org.glassfish.external.statistics.impl;
  28 import com.sun.org.glassfish.external.statistics.CountStatistic;
  29 import java.util.concurrent.atomic.AtomicLong;
  30 import java.util.Map;
  31 import java.lang.reflect.*;
  32 
  33 /**
  34  * @author Sreenivas Munnangi
  35  */
  36 public final class CountStatisticImpl extends StatisticImpl
  37     implements CountStatistic, InvocationHandler {
  38 
  39     private long count = 0L;
  40     private final long initCount;
  41 
  42     private final CountStatistic cs =
  43             (CountStatistic) Proxy.newProxyInstance(
  44             CountStatistic.class.getClassLoader(),
  45             new Class[] { CountStatistic.class },
  46             this);
  47 
  48     public CountStatisticImpl(long countVal, String name, String unit,
  49                               String desc, long sampleTime, long startTime) {
  50         super(name, unit, desc, startTime, sampleTime);
  51         count = countVal;
  52         initCount = countVal;
  53     }
  54 
  55     public CountStatisticImpl(String name, String unit, String desc) {
  56         this(0L, name, unit, desc, -1L, System.currentTimeMillis());
  57     }
  58 
  59     public synchronized CountStatistic getStatistic() {
  60         return cs;
  61     }
  62 
  63     public synchronized Map getStaticAsMap() {
  64         Map m = super.getStaticAsMap();
  65         m.put("count", getCount());
  66         return m;
  67     }
  68 
  69     public synchronized String toString() {
  70         return super.toString() + NEWLINE + "Count: " + getCount();
  71     }
  72 
  73     public synchronized long getCount() {
  74         return count;
  75     }
  76 
  77     public synchronized void setCount(long countVal) {
  78         count = countVal;
  79         sampleTime = System.currentTimeMillis();
  80     }
  81 
  82     public synchronized void increment() {
  83         count++;
  84         sampleTime = System.currentTimeMillis();
  85     }
  86 
  87     public synchronized void increment(long delta) {
  88         count = count + delta;
  89         sampleTime = System.currentTimeMillis();
  90     }
  91 
  92     public synchronized void decrement() {
  93         count--;
  94         sampleTime = System.currentTimeMillis();
  95     }
  96 
  97     @Override
  98     public synchronized void reset() {
  99         super.reset();
 100         count = initCount;
 101         sampleTime = -1L;
 102     }
 103 
 104     // todo: equals implementation
 105     public Object invoke(Object proxy, Method m, Object[] args) throws Throwable {
 106         Object result;
 107         try {
 108             result = m.invoke(this, args);
 109         } catch (InvocationTargetException e) {
 110             throw e.getTargetException();
 111         } catch (Exception e) {
 112             throw new RuntimeException("unexpected invocation exception: " +
 113                        e.getMessage());
 114         } finally {
 115         }
 116         return result;
 117     }
 118 }