1 /*
   2  * Copyright (c) 2009, 2013, 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.Map;
  30 import java.lang.reflect.*;
  31 
  32 /**
  33  * @author Sreenivas Munnangi
  34  */
  35 public final class CountStatisticImpl extends StatisticImpl
  36     implements CountStatistic, InvocationHandler {
  37 
  38     private long count = 0L;
  39     private final long initCount;
  40 
  41     private final CountStatistic cs =
  42             (CountStatistic) Proxy.newProxyInstance(
  43             CountStatistic.class.getClassLoader(),
  44             new Class[] { CountStatistic.class },
  45             this);
  46 
  47     public CountStatisticImpl(long countVal, String name, String unit,
  48                               String desc, long sampleTime, long startTime) {
  49         super(name, unit, desc, startTime, sampleTime);
  50         count = countVal;
  51         initCount = countVal;
  52     }
  53 
  54     public CountStatisticImpl(String name, String unit, String desc) {
  55         this(0L, name, unit, desc, -1L, System.currentTimeMillis());
  56     }
  57 
  58     public synchronized CountStatistic getStatistic() {
  59         return cs;
  60     }
  61 
  62     public synchronized Map getStaticAsMap() {
  63         Map m = super.getStaticAsMap();
  64         m.put("count", getCount());
  65         return m;
  66     }
  67 
  68     public synchronized String toString() {
  69         return super.toString() + NEWLINE + "Count: " + getCount();
  70     }
  71 
  72     public synchronized long getCount() {
  73         return count;
  74     }
  75 
  76     public synchronized void setCount(long countVal) {
  77         count = countVal;
  78         sampleTime = System.currentTimeMillis();
  79     }
  80 
  81     public synchronized void increment() {
  82         count++;
  83         sampleTime = System.currentTimeMillis();
  84     }
  85 
  86     public synchronized void increment(long delta) {
  87         count = count + delta;
  88         sampleTime = System.currentTimeMillis();
  89     }
  90 
  91     public synchronized void decrement() {
  92         count--;
  93         sampleTime = System.currentTimeMillis();
  94     }
  95 
  96     @Override
  97     public synchronized void reset() {
  98         super.reset();
  99         count = initCount;
 100         sampleTime = -1L;
 101     }
 102 
 103     // todo: equals implementation
 104     public Object invoke(Object proxy, Method m, Object[] args) throws Throwable {
 105         checkMethod(m);
 106 
 107         Object result;
 108         try {
 109             result = m.invoke(this, args);
 110         } catch (InvocationTargetException e) {
 111             throw e.getTargetException();
 112         } catch (Exception e) {
 113             throw new RuntimeException("unexpected invocation exception: " +
 114                        e.getMessage());
 115         }
 116         return result;
 117     }
 118 }