1   /***
2    * 
3    * Copyright 2004 Protique Ltd
4    * 
5    * Licensed under the Apache License, Version 2.0 (the "License"); 
6    * you may not use this file except in compliance with the License. 
7    * You may obtain a copy of the License at 
8    * 
9    * http://www.apache.org/licenses/LICENSE-2.0
10   * 
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS, 
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
14   * See the License for the specific language governing permissions and 
15   * limitations under the License. 
16   * 
17   **/
18  package org.activeio.stats;
19  
20  import javax.management.j2ee.statistics.Statistic;
21  
22  /***
23   * Shamelessly taken from the ActiveMQ project ( http://activemq.com )
24   * 
25   * Base class for a Statistic implementation
26   * @version $Revision: 1.1 $
27   */
28  public class StatisticImpl implements Statistic {
29      private String name;
30      private String unit;
31      private String description;
32      private long startTime;
33      private long lastSampleTime;
34  
35      public StatisticImpl(String name, String unit, String description) {
36          this.name = name;
37          this.unit = unit;
38          this.description = description;
39          startTime = System.currentTimeMillis();
40          lastSampleTime = startTime;
41      }
42  
43      public synchronized void reset() {
44          startTime = System.currentTimeMillis();
45          lastSampleTime = startTime;
46      }
47  
48      protected synchronized void updateSampleTime() {
49          lastSampleTime = System.currentTimeMillis();
50      }
51  
52      public synchronized String toString() {
53          StringBuffer buffer = new StringBuffer();
54          buffer.append(name);
55          buffer.append("{");
56          appendFieldDescription(buffer);
57          buffer.append(" }");
58          return buffer.toString();
59      }
60  
61      public String getName() {
62          return name;
63      }
64  
65      public String getUnit() {
66          return unit;
67      }
68  
69      public String getDescription() {
70          return description;
71      }
72  
73      public synchronized long getStartTime() {
74          return startTime;
75      }
76  
77      public synchronized long getLastSampleTime() {
78          return lastSampleTime;
79      }
80  
81      protected synchronized void appendFieldDescription(StringBuffer buffer) {
82          buffer.append(" unit: ");
83          buffer.append(unit);
84          buffer.append(" startTime: ");
85          //buffer.append(new Date(startTime));
86          buffer.append(startTime);
87          buffer.append(" lastSampleTime: ");
88          //buffer.append(new Date(lastSampleTime));
89          buffer.append(lastSampleTime);
90          buffer.append(" description: ");
91          buffer.append(description);
92      }
93  }