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 
  28 package com.sun.org.glassfish.external.statistics.impl;
  29 import com.sun.org.glassfish.external.statistics.StringStatistic;
  30 import java.util.Map;
  31 import java.lang.reflect.*;
  32 
  33 /**
  34  * @author Sreenivas Munnangi
  35  */
  36 public final class StringStatisticImpl extends StatisticImpl
  37     implements StringStatistic, InvocationHandler {
  38 
  39     private volatile String str = null;
  40     private final String initStr;
  41 
  42     private final StringStatistic ss =
  43             (StringStatistic) Proxy.newProxyInstance(
  44             StringStatistic.class.getClassLoader(),
  45             new Class[] { StringStatistic.class },
  46             this);
  47 
  48     public StringStatisticImpl(String str, String name, String unit,
  49                               String desc, long sampleTime, long startTime) {
  50         super(name, unit, desc, startTime, sampleTime);
  51         this.str = str;
  52         initStr = str;
  53     }
  54 
  55     public StringStatisticImpl(String name, String unit, String desc) {
  56         this("", name, unit, desc, System.currentTimeMillis(), System.currentTimeMillis());
  57     }
  58 
  59     public synchronized StringStatistic getStatistic() {
  60         return ss;
  61     }
  62 
  63     public synchronized Map getStaticAsMap() {
  64         Map m = super.getStaticAsMap();
  65         if (getCurrent() != null) {
  66             m.put("current", getCurrent());
  67         }
  68         return m;
  69     }
  70 
  71     public synchronized String toString() {
  72         return super.toString() + NEWLINE + "Current-value: " + getCurrent();
  73     }
  74 
  75     public String getCurrent() {
  76         return str;
  77     }
  78 
  79     public void setCurrent(String str) {
  80         this.str = str;
  81         sampleTime = System.currentTimeMillis();
  82     }
  83 
  84     @Override
  85     public synchronized void reset() {
  86         super.reset();
  87         this.str = initStr;
  88         sampleTime = -1L;
  89     }
  90 
  91     // todo: equals implementation
  92     public Object invoke(Object proxy, Method m, Object[] args) throws Throwable {
  93         checkMethod(m);
  94 
  95         Object result;
  96         try {
  97             result = m.invoke(this, args);
  98         } catch (InvocationTargetException e) {
  99             throw e.getTargetException();
 100         } catch (Exception e) {
 101             throw new RuntimeException("unexpected invocation exception: " +
 102                        e.getMessage());
 103         }
 104         return result;
 105     }
 106 }