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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.codehaus.activemq.management;
19  
20  import javax.management.j2ee.statistics.Statistic;
21  
22  /***
23   * Base class for a Statistic implementation
24   *
25   * @version $Revision: 1.2 $
26   */
27  public class StatisticImpl implements Statistic, Resettable {
28      private String name;
29      private String unit;
30      private String description;
31      private long startTime;
32      private long lastSampleTime;
33  
34      public StatisticImpl(String name, String unit, String description) {
35          this.name = name;
36          this.unit = unit;
37          this.description = description;
38          startTime = System.currentTimeMillis();
39          lastSampleTime = startTime;
40      }
41  
42      public synchronized void reset() {
43          startTime = System.currentTimeMillis();
44          lastSampleTime = startTime;
45      }
46  
47      protected synchronized void updateSampleTime() {
48          lastSampleTime = System.currentTimeMillis();
49      }
50  
51      public synchronized String toString() {
52          StringBuffer buffer = new StringBuffer();
53          buffer.append(name);
54          buffer.append("{");
55          appendFieldDescription(buffer);
56          buffer.append(" }");
57          return buffer.toString();
58      }
59  
60      public String getName() {
61          return name;
62      }
63  
64      public String getUnit() {
65          return unit;
66      }
67  
68      public String getDescription() {
69          return description;
70      }
71  
72      public synchronized long getStartTime() {
73          return startTime;
74      }
75  
76      public synchronized long getLastSampleTime() {
77          return lastSampleTime;
78      }
79  
80      protected synchronized void appendFieldDescription(StringBuffer buffer) {
81          buffer.append(" unit: ");
82          buffer.append(unit);
83          buffer.append(" startTime: ");
84          //buffer.append(new Date(startTime));
85          buffer.append(startTime);
86          buffer.append(" lastSampleTime: ");
87          //buffer.append(new Date(lastSampleTime));
88          buffer.append(lastSampleTime);
89          buffer.append(" description: ");
90          buffer.append(description);
91      }
92  }