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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.CountStatistic;
21  
22  /***
23   * A count statistic implementation
24   *
25   * @version $Revision: 1.3 $
26   */
27  public class CountStatisticImpl extends StatisticImpl implements CountStatistic {
28  
29      private long count;
30      private CountStatisticImpl parent;
31  
32      public CountStatisticImpl(CountStatisticImpl parent, String name, String description) {
33          this(name, description);
34          this.parent = parent;
35      }
36  
37      public CountStatisticImpl(String name, String description) {
38          this(name, "count", description);
39      }
40  
41      public CountStatisticImpl(String name, String unit, String description) {
42          super(name, unit, description);
43      }
44  
45      public void reset() {
46          super.reset();
47          count = 0;
48      }
49  
50      public long getCount() {
51          return count;
52      }
53  
54      public void increment() {
55          ++count;
56          updateSampleTime();
57          if (parent != null) {
58              parent.increment();
59          }
60      }
61  
62      public void decrement() {
63          --count;
64          updateSampleTime();
65          if (parent != null) {
66              parent.decrement();
67          }
68      }
69  
70      public CountStatisticImpl getParent() {
71          return parent;
72      }
73  
74      public void setParent(CountStatisticImpl parent) {
75          this.parent = parent;
76      }
77  
78      protected void appendFieldDescription(StringBuffer buffer) {
79          buffer.append(" count: ");
80          buffer.append(Long.toString(count));
81          super.appendFieldDescription(buffer);
82      }
83  }