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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 EDU.oswego.cs.dl.util.concurrent.SynchronizedLong;
21  
22  import javax.management.j2ee.statistics.CountStatistic;
23  
24  /***
25   * A count statistic implementation
26   *
27   * @version $Revision: 1.5 $
28   */
29  public class CountStatisticImpl extends StatisticImpl implements CountStatistic {
30  
31      private final SynchronizedLong counter = new SynchronizedLong(0);
32      private CountStatisticImpl parent;
33  
34      public CountStatisticImpl(CountStatisticImpl parent, String name, String description) {
35          this(name, description);
36          this.parent = parent;
37      }
38  
39      public CountStatisticImpl(String name, String description) {
40          this(name, "count", description);
41      }
42  
43      public CountStatisticImpl(String name, String unit, String description) {
44          super(name, unit, description);
45      }
46  
47      public void reset() {
48          super.reset();
49          counter.set(0);
50      }
51  
52      public long getCount() {
53          return counter.get();
54      }
55  
56      public void setCount(long count) {
57          counter.set(count);
58      }
59  
60      public void add(long amount) {
61          counter.add(amount);
62          updateSampleTime();
63          if (parent != null) {
64              parent.add(amount);
65          }
66      }
67  
68      public void increment() {
69          counter.increment();
70          updateSampleTime();
71          if (parent != null) {
72              parent.increment();
73          }
74      }
75  
76      public void subtract(long amount) {
77          counter.subtract(amount);
78          updateSampleTime();
79          if (parent != null) {
80              parent.subtract(amount);
81          }
82      }
83      
84      public void decrement() {
85          counter.decrement();
86          updateSampleTime();
87          if (parent != null) {
88              parent.decrement();
89          }
90      }
91  
92      public CountStatisticImpl getParent() {
93          return parent;
94      }
95  
96      public void setParent(CountStatisticImpl parent) {
97          this.parent = parent;
98      }
99  
100     protected void appendFieldDescription(StringBuffer buffer) {
101         buffer.append(" count: ");
102         buffer.append(Long.toString(counter.get()));
103         super.appendFieldDescription(buffer);
104     }
105 }